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jdk/src/java.logging/share/classes/java/util/logging/Logger.java
Mandy Chung c6339cb8a2 8271820: Implementation of JEP 416: Reimplement Core Reflection with Method Handle 
8013527: calling MethodHandles.lookup on itself leads to errors

Co-authored-by: Peter Levart <plevart@openjdk.org>
Co-authored-by: Claes Redestad <redestad@openjdk.org>
Co-authored-by: Mandy Chung <mchung@openjdk.org>
Reviewed-by: mcimadamore, plevart, egahlin, redestad, cjplummer, alanb
2021-10-28 18:32:50 +00:00

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/*
* Copyright (c) 2000, 2021, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package java.util.logging;
import java.lang.ref.WeakReference;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.Locale;
import java.util.MissingResourceException;
import java.util.Objects;
import java.util.ResourceBundle;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.function.Supplier;
import jdk.internal.access.JavaUtilResourceBundleAccess;
import jdk.internal.access.SharedSecrets;
import jdk.internal.reflect.CallerSensitive;
import jdk.internal.reflect.CallerSensitiveAdapter;
import jdk.internal.reflect.Reflection;
import static jdk.internal.logger.DefaultLoggerFinder.isSystem;
/**
* A Logger object is used to log messages for a specific
* system or application component. Loggers are normally named,
* using a hierarchical dot-separated namespace. Logger names
* can be arbitrary strings, but they should normally be based on
* the package name or class name of the logged component, such
* as java.net or javax.swing. In addition it is possible to create
* "anonymous" Loggers that are not stored in the Logger namespace.
* <p>
* Logger objects may be obtained by calls on one of the getLogger
* factory methods. These will either create a new Logger or
* return a suitable existing Logger. It is important to note that
* the Logger returned by one of the {@code getLogger} factory methods
* may be garbage collected at any time if a strong reference to the
* Logger is not kept.
* <p>
* Logging messages will be forwarded to registered Handler
* objects, which can forward the messages to a variety of
* destinations, including consoles, files, OS logs, etc.
* <p>
* Each Logger keeps track of a "parent" Logger, which is its
* nearest existing ancestor in the Logger namespace.
* <p>
* Each Logger has a "Level" associated with it. This reflects
* a minimum Level that this logger cares about. If a Logger's
* level is set to {@code null}, then its effective level is inherited
* from its parent, which may in turn obtain it recursively from its
* parent, and so on up the tree.
* <p>
* The log level can be configured based on the properties from the
* logging configuration file, as described in the description
* of the LogManager class. However it may also be dynamically changed
* by calls on the Logger.setLevel method. If a logger's level is
* changed the change may also affect child loggers, since any child
* logger that has {@code null} as its level will inherit its
* effective level from its parent.
* <p>
* On each logging call the Logger initially performs a cheap
* check of the request level (e.g., SEVERE or FINE) against the
* effective log level of the logger. If the request level is
* lower than the log level, the logging call returns immediately.
* <p>
* After passing this initial (cheap) test, the Logger will allocate
* a LogRecord to describe the logging message. It will then call a
* Filter (if present) to do a more detailed check on whether the
* record should be published. If that passes it will then publish
* the LogRecord to its output Handlers. By default, loggers also
* publish to their parent's Handlers, recursively up the tree.
* <p>
* Each Logger may have a {@code ResourceBundle} associated with it.
* The {@code ResourceBundle} may be specified by name, using the
* {@link #getLogger(java.lang.String, java.lang.String)} factory
* method, or by value - using the {@link
* #setResourceBundle(java.util.ResourceBundle) setResourceBundle} method.
* This bundle will be used for localizing logging messages.
* If a Logger does not have its own {@code ResourceBundle} or resource bundle
* name, then it will inherit the {@code ResourceBundle} or resource bundle name
* from its parent, recursively up the tree.
* <p>
* Most of the logger output methods take a "msg" argument. This
* msg argument may be either a raw value or a localization key.
* During formatting, if the logger has (or inherits) a localization
* {@code ResourceBundle} and if the {@code ResourceBundle} has a mapping for
* the msg string, then the msg string is replaced by the localized value.
* Otherwise the original msg string is used. Typically, formatters use
* java.text.MessageFormat style formatting to format parameters, so
* for example a format string "{0} {1}" would format two parameters
* as strings.
* <p>
* A set of methods alternatively take a "msgSupplier" instead of a "msg"
* argument. These methods take a {@link Supplier}{@code <String>} function
* which is invoked to construct the desired log message only when the message
* actually is to be logged based on the effective log level thus eliminating
* unnecessary message construction. For example, if the developer wants to
* log system health status for diagnosis, with the String-accepting version,
* the code would look like:
* <pre>{@code
*
* class DiagnosisMessages {
* static String systemHealthStatus() {
* // collect system health information
* ...
* }
* }
* ...
* logger.log(Level.FINER, DiagnosisMessages.systemHealthStatus());
* }</pre>
* With the above code, the health status is collected unnecessarily even when
* the log level FINER is disabled. With the Supplier-accepting version as
* below, the status will only be collected when the log level FINER is
* enabled.
* <pre>{@code
*
* logger.log(Level.FINER, DiagnosisMessages::systemHealthStatus);
* }</pre>
* <p>
* When looking for a {@code ResourceBundle}, the logger will first look at
* whether a bundle was specified using {@link
* #setResourceBundle(java.util.ResourceBundle) setResourceBundle}, and then
* only whether a resource bundle name was specified through the {@link
* #getLogger(java.lang.String, java.lang.String) getLogger} factory method.
* If no {@code ResourceBundle} or no resource bundle name is found,
* then it will use the nearest {@code ResourceBundle} or resource bundle
* name inherited from its parent tree.<br>
* When a {@code ResourceBundle} was inherited or specified through the
* {@link
* #setResourceBundle(java.util.ResourceBundle) setResourceBundle} method, then
* that {@code ResourceBundle} will be used. Otherwise if the logger only
* has or inherited a resource bundle name, then that resource bundle name
* will be mapped to a {@code ResourceBundle} object, using the default Locale
* at the time of logging.
* <br id="ResourceBundleMapping">When mapping resource bundle names to
* {@code ResourceBundle} objects, the logger will first try to use the
* Thread's {@linkplain java.lang.Thread#getContextClassLoader() context class
* loader} to map the given resource bundle name to a {@code ResourceBundle}.
* If the thread context class loader is {@code null}, it will try the
* {@linkplain java.lang.ClassLoader#getSystemClassLoader() system class loader}
* instead. If the {@code ResourceBundle} is still not found, it will use the
* class loader of the first caller of the {@link
* #getLogger(java.lang.String, java.lang.String) getLogger} factory method.
* <p>
* Formatting (including localization) is the responsibility of
* the output Handler, which will typically call a Formatter.
* <p>
* Note that formatting need not occur synchronously. It may be delayed
* until a LogRecord is actually written to an external sink.
* <p>
* The logging methods are grouped in five main categories:
* <ul>
* <li><p>
* There are a set of "log" methods that take a log level, a message
* string, and optionally some parameters to the message string.
* <li><p>
* There are a set of "logp" methods (for "log precise") that are
* like the "log" methods, but also take an explicit source class name
* and method name.
* <li><p>
* There are a set of "logrb" method (for "log with resource bundle")
* that are like the "logp" method, but also take an explicit resource
* bundle object for use in localizing the log message.
* <li><p>
* There are convenience methods for tracing method entries (the
* "entering" methods), method returns (the "exiting" methods) and
* throwing exceptions (the "throwing" methods).
* <li><p>
* Finally, there are a set of convenience methods for use in the
* very simplest cases, when a developer simply wants to log a
* simple string at a given log level. These methods are named
* after the standard Level names ("severe", "warning", "info", etc.)
* and take a single argument, a message string.
* </ul>
* <p>
* For the methods that do not take an explicit source name and
* method name, the Logging framework will make a "best effort"
* to determine which class and method called into the logging method.
* However, it is important to realize that this automatically inferred
* information may only be approximate (or may even be quite wrong!).
* Virtual machines are allowed to do extensive optimizations when
* JITing and may entirely remove stack frames, making it impossible
* to reliably locate the calling class and method.
* <P>
* All methods on Logger are multi-thread safe.
* <p>
* <b>Subclassing Information:</b> Note that a LogManager class may
* provide its own implementation of named Loggers for any point in
* the namespace. Therefore, any subclasses of Logger (unless they
* are implemented in conjunction with a new LogManager class) should
* take care to obtain a Logger instance from the LogManager class and
* should delegate operations such as "isLoggable" and "log(LogRecord)"
* to that instance. Note that in order to intercept all logging
* output, subclasses need only override the log(LogRecord) method.
* All the other logging methods are implemented as calls on this
* log(LogRecord) method.
*
* @since 1.4
*/
public class Logger {
private static final Handler emptyHandlers[] = new Handler[0];
private static final int offValue = Level.OFF.intValue();
static final String SYSTEM_LOGGER_RB_NAME = "sun.util.logging.resources.logging";
// This class is immutable and it is important that it remains so.
private static final class LoggerBundle {
final String resourceBundleName; // Base name of the bundle.
final ResourceBundle userBundle; // Bundle set through setResourceBundle.
private LoggerBundle(String resourceBundleName, ResourceBundle bundle) {
this.resourceBundleName = resourceBundleName;
this.userBundle = bundle;
}
boolean isSystemBundle() {
return SYSTEM_LOGGER_RB_NAME.equals(resourceBundleName);
}
static LoggerBundle get(String name, ResourceBundle bundle) {
if (name == null && bundle == null) {
return NO_RESOURCE_BUNDLE;
} else if (SYSTEM_LOGGER_RB_NAME.equals(name) && bundle == null) {
return SYSTEM_BUNDLE;
} else {
return new LoggerBundle(name, bundle);
}
}
}
// This instance will be shared by all loggers created by the system
// code
private static final LoggerBundle SYSTEM_BUNDLE =
new LoggerBundle(SYSTEM_LOGGER_RB_NAME, null);
// This instance indicates that no resource bundle has been specified yet,
// and it will be shared by all loggers which have no resource bundle.
private static final LoggerBundle NO_RESOURCE_BUNDLE =
new LoggerBundle(null, null);
// Calling SharedSecrets.getJavaUtilResourceBundleAccess()
// forces the initialization of ResourceBundle.class, which
// can be too early if the VM has not finished booting yet.
private static final class RbAccess {
static final JavaUtilResourceBundleAccess RB_ACCESS =
SharedSecrets.getJavaUtilResourceBundleAccess();
}
// A value class that holds the logger configuration data.
// This configuration can be shared between an application logger
// and a system logger of the same name.
private static final class ConfigurationData {
// The delegate field is used to avoid races while
// merging configuration. This will ensure that any pending
// configuration action on an application logger will either
// be finished before the merge happens, or will be forwarded
// to the system logger configuration after the merge is completed.
// By default delegate=this.
private volatile ConfigurationData delegate;
volatile boolean useParentHandlers;
volatile Filter filter;
volatile Level levelObject;
volatile int levelValue; // current effective level value
final CopyOnWriteArrayList<Handler> handlers =
new CopyOnWriteArrayList<>();
ConfigurationData() {
delegate = this;
useParentHandlers = true;
levelValue = Level.INFO.intValue();
}
void setUseParentHandlers(boolean flag) {
useParentHandlers = flag;
if (delegate != this) {
// merge in progress - propagate value to system peer.
final ConfigurationData system = delegate;
synchronized (system) {
system.useParentHandlers = useParentHandlers;
}
}
}
void setFilter(Filter f) {
filter = f;
if (delegate != this) {
// merge in progress - propagate value to system peer.
final ConfigurationData system = delegate;
synchronized (system) {
system.filter = filter;
}
}
}
void setLevelObject(Level l) {
levelObject = l;
if (delegate != this) {
// merge in progress - propagate value to system peer.
final ConfigurationData system = delegate;
synchronized (system) {
system.levelObject = levelObject;
}
}
}
void setLevelValue(int v) {
levelValue = v;
if (delegate != this) {
// merge in progress - propagate value to system peer.
final ConfigurationData system = delegate;
synchronized (system) {
system.levelValue = levelValue;
}
}
}
void addHandler(Handler h) {
if (handlers.add(h)) {
if (delegate != this) {
// merge in progress - propagate value to system peer.
final ConfigurationData system = delegate;
synchronized (system) {
system.handlers.addIfAbsent(h);
}
}
}
}
void removeHandler(Handler h) {
if (handlers.remove(h)) {
if (delegate != this) {
// merge in progress - propagate value to system peer.
final ConfigurationData system = delegate;
synchronized (system) {
system.handlers.remove(h);
}
}
}
}
ConfigurationData merge(Logger systemPeer) {
if (!systemPeer.isSystemLogger) {
// should never come here
throw new InternalError("not a system logger");
}
ConfigurationData system = systemPeer.config;
if (system == this) {
// nothing to do
return system;
}
synchronized (system) {
// synchronize before checking on delegate to counter
// race conditions where two threads might attempt to
// merge concurrently
if (delegate == system) {
// merge already performed;
return system;
}
// publish system as the temporary delegate configuration.
// This should take care of potential race conditions where
// an other thread might attempt to call e.g. setlevel on
// the application logger while merge is in progress.
// (see implementation of ConfigurationData::setLevel)
delegate = system;
// merge this config object data into the system config
system.useParentHandlers = useParentHandlers;
system.filter = filter;
system.levelObject = levelObject;
system.levelValue = levelValue;
// Prevent race condition in case two threads attempt to merge
// configuration and add handlers at the same time. We don't want
// to add the same handlers twice.
//
// Handlers are created and loaded by LogManager.addLogger. If we
// reach here, then it means that the application logger has
// been created first and added with LogManager.addLogger, and the
// system logger was created after - and no handler has been added
// to it by LogManager.addLogger. Therefore, system.handlers
// should be empty.
//
// A non empty cfg.handlers list indicates a race condition
// where two threads might attempt to merge the configuration
// or add handlers concurrently. Though of no consequence for
// the other data (level etc...) this would be an issue if we
// added the same handlers twice.
//
for (Handler h : handlers) {
if (!system.handlers.contains(h)) {
systemPeer.addHandler(h);
}
}
system.handlers.retainAll(handlers);
system.handlers.addAllAbsent(handlers);
}
// sanity: update effective level after merging
synchronized(treeLock) {
systemPeer.updateEffectiveLevel();
}
return system;
}
}
// The logger configuration data. Ideally, this should be final
// for system loggers, and replace-once for application loggers.
// When an application requests a logger by name, we do not know a-priori
// whether that corresponds to a system logger name or not.
// So if no system logger by that name already exists, we simply return an
// application logger.
// If a system class later requests a system logger of the same name, then
// the application logger and system logger configurations will be merged
// in a single instance of ConfigurationData that both loggers will share.
private volatile ConfigurationData config;
private volatile LogManager manager;
private String name;
private volatile LoggerBundle loggerBundle = NO_RESOURCE_BUNDLE;
private boolean anonymous;
// Cache to speed up behavior of findResourceBundle:
private WeakReference<ResourceBundle> catalogRef; // Cached resource bundle
private String catalogName; // name associated with catalog
private Locale catalogLocale; // locale associated with catalog
// The fields relating to parent-child relationships and levels
// are managed under a separate lock, the treeLock.
private static final Object treeLock = new Object();
// We keep weak references from parents to children, but strong
// references from children to parents.
private volatile Logger parent; // our nearest parent.
private ArrayList<LogManager.LoggerWeakRef> kids; // WeakReferences to loggers that have us as parent
private WeakReference<Module> callerModuleRef;
private final boolean isSystemLogger;
/**
* GLOBAL_LOGGER_NAME is a name for the global logger.
*
* @since 1.6
*/
public static final String GLOBAL_LOGGER_NAME = "global";
/**
* Return global logger object with the name Logger.GLOBAL_LOGGER_NAME.
*
* @return global logger object
* @since 1.7
*/
public static final Logger getGlobal() {
// In order to break a cyclic dependence between the LogManager
// and Logger static initializers causing deadlocks, the global
// logger is created with a special constructor that does not
// initialize its log manager.
//
// If an application calls Logger.getGlobal() before any logger
// has been initialized, it is therefore possible that the
// LogManager class has not been initialized yet, and therefore
// Logger.global.manager will be null.
//
// In order to finish the initialization of the global logger, we
// will therefore call LogManager.getLogManager() here.
//
// To prevent race conditions we also need to call
// LogManager.getLogManager() unconditionally here.
// Indeed we cannot rely on the observed value of global.manager,
// because global.manager will become not null somewhere during
// the initialization of LogManager.
// If two threads are calling getGlobal() concurrently, one thread
// will see global.manager null and call LogManager.getLogManager(),
// but the other thread could come in at a time when global.manager
// is already set although ensureLogManagerInitialized is not finished
// yet...
// Calling LogManager.getLogManager() unconditionally will fix that.
LogManager.getLogManager();
// Now the global LogManager should be initialized,
// and the global logger should have been added to
// it, unless we were called within the constructor of a LogManager
// subclass installed as LogManager, in which case global.manager
// would still be null, and global will be lazily initialized later on.
return global;
}
/**
* The "global" Logger object is provided as a convenience to developers
* who are making casual use of the Logging package. Developers
* who are making serious use of the logging package (for example
* in products) should create and use their own Logger objects,
* with appropriate names, so that logging can be controlled on a
* suitable per-Logger granularity. Developers also need to keep a
* strong reference to their Logger objects to prevent them from
* being garbage collected.
*
* @deprecated Initialization of this field is prone to deadlocks.
* The field must be initialized by the Logger class initialization
* which may cause deadlocks with the LogManager class initialization.
* In such cases two class initialization wait for each other to complete.
* The preferred way to get the global logger object is via the call
* {@code Logger.getGlobal()}.
* For compatibility with old JDK versions where the
* {@code Logger.getGlobal()} is not available use the call
* {@code Logger.getLogger(Logger.GLOBAL_LOGGER_NAME)}
* or {@code Logger.getLogger("global")}.
*/
@Deprecated
public static final Logger global = new Logger(GLOBAL_LOGGER_NAME);
/**
* Protected method to construct a logger for a named subsystem.
* <p>
* The logger will be initially configured with a null Level
* and with useParentHandlers set to true.
*
* @param name A name for the logger. This should
* be a dot-separated name and should normally
* be based on the package name or class name
* of the subsystem, such as java.net
* or javax.swing. It may be null for anonymous Loggers.
* @param resourceBundleName name of ResourceBundle to be used for localizing
* messages for this logger. May be null if none
* of the messages require localization.
* @throws MissingResourceException if the resourceBundleName is non-null and
* no corresponding resource can be found.
*/
protected Logger(String name, String resourceBundleName) {
this(name, resourceBundleName, null, LogManager.getLogManager(), false);
}
Logger(String name, String resourceBundleName, Module caller,
LogManager manager, boolean isSystemLogger) {
this.manager = manager;
this.isSystemLogger = isSystemLogger;
this.config = new ConfigurationData();
this.name = name;
setupResourceInfo(resourceBundleName, caller);
}
// Called by LogManager when a system logger is created
// after a user logger of the same name.
// Ensure that both loggers will share the same
// configuration.
final void mergeWithSystemLogger(Logger system) {
// sanity checks
if (!system.isSystemLogger
|| anonymous
|| name == null
|| !name.equals(system.name)) {
// should never come here
throw new InternalError("invalid logger merge");
}
checkPermission();
final ConfigurationData cfg = config;
if (cfg != system.config) {
config = cfg.merge(system);
}
}
private void setCallerModuleRef(Module callerModule) {
if (callerModule != null) {
this.callerModuleRef = new WeakReference<>(callerModule);
}
}
private Module getCallerModule() {
return (callerModuleRef != null)
? callerModuleRef.get()
: null;
}
// This constructor is used only to create the global Logger.
// It is needed to break a cyclic dependence between the LogManager
// and Logger static initializers causing deadlocks.
private Logger(String name) {
// The manager field is not initialized here.
this.name = name;
this.isSystemLogger = true;
config = new ConfigurationData();
}
// It is called from LoggerContext.addLocalLogger() when the logger
// is actually added to a LogManager.
void setLogManager(LogManager manager) {
this.manager = manager;
}
private void checkPermission() throws SecurityException {
if (!anonymous) {
if (manager == null) {
// Complete initialization of the global Logger.
manager = LogManager.getLogManager();
}
manager.checkPermission();
}
}
// Until all JDK code converted to call sun.util.logging.PlatformLogger
// (see 7054233), we need to determine if Logger.getLogger is to add
// a system logger or user logger.
//
// As an interim solution, if the immediate caller whose caller loader is
// null, we assume it's a system logger and add it to the system context.
// These system loggers only set the resource bundle to the given
// resource bundle name (rather than the default system resource bundle).
private static class SystemLoggerHelper {
static boolean disableCallerCheck = getBooleanProperty("sun.util.logging.disableCallerCheck");
private static boolean getBooleanProperty(final String key) {
@SuppressWarnings("removal")
String s = AccessController.doPrivileged(new PrivilegedAction<String>() {
@Override
public String run() {
return System.getProperty(key);
}
});
return Boolean.parseBoolean(s);
}
}
private static Logger demandLogger(String name, String resourceBundleName, Class<?> caller) {
LogManager manager = LogManager.getLogManager();
if (!SystemLoggerHelper.disableCallerCheck) {
if (isSystem(caller.getModule())) {
return manager.demandSystemLogger(name, resourceBundleName, caller);
}
}
return manager.demandLogger(name, resourceBundleName, caller);
// ends up calling new Logger(name, resourceBundleName, caller)
// iff the logger doesn't exist already
}
/**
* Find or create a logger for a named subsystem. If a logger has
* already been created with the given name it is returned. Otherwise
* a new logger is created.
* <p>
* If a new logger is created its log level will be configured
* based on the LogManager configuration and it will be configured
* to also send logging output to its parent's Handlers. It will
* be registered in the LogManager global namespace.
* <p>
* Note: The LogManager may only retain a weak reference to the newly
* created Logger. It is important to understand that a previously
* created Logger with the given name may be garbage collected at any
* time if there is no strong reference to the Logger. In particular,
* this means that two back-to-back calls like
* {@code getLogger("MyLogger").log(...)} may use different Logger
* objects named "MyLogger" if there is no strong reference to the
* Logger named "MyLogger" elsewhere in the program.
*
* @param name A name for the logger. This should
* be a dot-separated name and should normally
* be based on the package name or class name
* of the subsystem, such as java.net
* or javax.swing
* @return a suitable Logger
* @throws NullPointerException if the name is null.
*/
// Synchronization is not required here. All synchronization for
// adding a new Logger object is handled by LogManager.addLogger().
@CallerSensitive
public static Logger getLogger(String name) {
// This method is intentionally not a wrapper around a call
// to getLogger(name, resourceBundleName). If it were then
// this sequence:
//
// getLogger("Foo", "resourceBundleForFoo");
// getLogger("Foo");
//
// would throw an IllegalArgumentException in the second call
// because the wrapper would result in an attempt to replace
// the existing "resourceBundleForFoo" with null.
return Logger.getLogger(name, Reflection.getCallerClass());
}
/**
* Find or create a logger for a named subsystem on behalf
* of the given caller.
*
* This method is called by {@link #getLogger(java.lang.String)} after
* it has obtained a reference to its caller's class.
*
* @param name A name for the logger.
* @param callerClass The class that called {@link
* #getLogger(java.lang.String)}.
* @return a suitable Logger for {@code callerClass}.
*/
@CallerSensitiveAdapter
private static Logger getLogger(String name, Class<?> callerClass) {
return demandLogger(name, null, callerClass);
}
/**
* Find or create a logger for a named subsystem. If a logger has
* already been created with the given name it is returned. Otherwise
* a new logger is created.
*
* <p>
* If a new logger is created its log level will be configured
* based on the LogManager and it will be configured to also send logging
* output to its parent's Handlers. It will be registered in
* the LogManager global namespace.
* <p>
* Note: The LogManager may only retain a weak reference to the newly
* created Logger. It is important to understand that a previously
* created Logger with the given name may be garbage collected at any
* time if there is no strong reference to the Logger. In particular,
* this means that two back-to-back calls like
* {@code getLogger("MyLogger", ...).log(...)} may use different Logger
* objects named "MyLogger" if there is no strong reference to the
* Logger named "MyLogger" elsewhere in the program.
* <p>
* If the named Logger already exists and does not yet have a
* localization resource bundle then the given resource bundle
* name is used. If the named Logger already exists and has
* a different resource bundle name then an IllegalArgumentException
* is thrown.
*
* @param name A name for the logger. This should
* be a dot-separated name and should normally
* be based on the package name or class name
* of the subsystem, such as java.net
* or javax.swing
* @param resourceBundleName name of ResourceBundle to be used for localizing
* messages for this logger. May be {@code null}
* if none of the messages require localization.
* @return a suitable Logger
* @throws MissingResourceException if the resourceBundleName is non-null and
* no corresponding resource can be found.
* @throws IllegalArgumentException if the Logger already exists and uses
* a different resource bundle name; or if
* {@code resourceBundleName} is {@code null} but the named
* logger has a resource bundle set.
* @throws NullPointerException if the name is null.
*/
// Synchronization is not required here. All synchronization for
// adding a new Logger object is handled by LogManager.addLogger().
@CallerSensitive
public static Logger getLogger(String name, String resourceBundleName) {
return Logger.getLogger(name, resourceBundleName, Reflection.getCallerClass());
}
/**
* Find or create a logger for a named subsystem on behalf
* of the given caller.
*
* This method is called by {@link
* #getLogger(java.lang.String, java.lang.String)} after
* it has obtained a reference to its caller's class.
*
* @param name A name for the logger.
* @param resourceBundleName name of ResourceBundle to be used for localizing
* messages for this logger. May be {@code null}
* if none of the messages require localization.
* @param callerClass The class that called {@link
* #getLogger(java.lang.String, java.lang.String)}.
* This class will also be used for locating the
* resource bundle if {@code resourceBundleName} is
* not {@code null}.
* @return a suitable Logger for {@code callerClass}.
*/
@CallerSensitiveAdapter
private static Logger getLogger(String name, String resourceBundleName,
Class<?> callerClass) {
Logger result = demandLogger(name, resourceBundleName, callerClass);
// MissingResourceException or IllegalArgumentException can be
// thrown by setupResourceInfo().
// We have to set the callers ClassLoader here in case demandLogger
// above found a previously created Logger. This can happen, for
// example, if Logger.getLogger(name) is called and subsequently
// Logger.getLogger(name, resourceBundleName) is called. In this case
// we won't necessarily have the correct classloader saved away, so
// we need to set it here, too.
result.setupResourceInfo(resourceBundleName, callerClass);
return result;
}
// package-private
// Add a platform logger to the system context.
// i.e. caller of sun.util.logging.PlatformLogger.getLogger
static Logger getPlatformLogger(String name) {
LogManager manager = LogManager.getLogManager();
// all loggers in the system context will default to
// the system logger's resource bundle - therefore the caller won't
// be needed and can be null.
Logger result = manager.demandSystemLogger(name, SYSTEM_LOGGER_RB_NAME, (Module)null);
return result;
}
/**
* Create an anonymous Logger. The newly created Logger is not
* registered in the LogManager namespace. There will be no
* access checks on updates to the logger.
* <p>
* This factory method is primarily intended for use from applets.
* Because the resulting Logger is anonymous it can be kept private
* by the creating class. This removes the need for normal security
* checks, which in turn allows untrusted applet code to update
* the control state of the Logger. For example an applet can do
* a setLevel or an addHandler on an anonymous Logger.
* <p>
* Even although the new logger is anonymous, it is configured
* to have the root logger ("") as its parent. This means that
* by default it inherits its effective level and handlers
* from the root logger. Changing its parent via the
* {@link #setParent(java.util.logging.Logger) setParent} method
* will still require the security permission specified by that method.
*
* @return a newly created private Logger
*/
public static Logger getAnonymousLogger() {
return getAnonymousLogger(null);
}
/**
* Create an anonymous Logger. The newly created Logger is not
* registered in the LogManager namespace. There will be no
* access checks on updates to the logger.
* <p>
* This factory method is primarily intended for use from applets.
* Because the resulting Logger is anonymous it can be kept private
* by the creating class. This removes the need for normal security
* checks, which in turn allows untrusted applet code to update
* the control state of the Logger. For example an applet can do
* a setLevel or an addHandler on an anonymous Logger.
* <p>
* Even although the new logger is anonymous, it is configured
* to have the root logger ("") as its parent. This means that
* by default it inherits its effective level and handlers
* from the root logger. Changing its parent via the
* {@link #setParent(java.util.logging.Logger) setParent} method
* will still require the security permission specified by that method.
*
* @param resourceBundleName name of ResourceBundle to be used for localizing
* messages for this logger.
* May be null if none of the messages require localization.
* @return a newly created private Logger
* @throws MissingResourceException if the resourceBundleName is non-null and
* no corresponding resource can be found.
*/
// Synchronization is not required here. All synchronization for
// adding a new anonymous Logger object is handled by doSetParent().
@CallerSensitive
public static Logger getAnonymousLogger(String resourceBundleName) {
LogManager manager = LogManager.getLogManager();
// cleanup some Loggers that have been GC'ed
manager.drainLoggerRefQueueBounded();
final Class<?> callerClass = Reflection.getCallerClass();
final Module module = callerClass.getModule();
Logger result = new Logger(null, resourceBundleName,
module, manager, false);
result.anonymous = true;
Logger root = manager.getLogger("");
result.doSetParent(root);
return result;
}
/**
* Retrieve the localization resource bundle for this
* logger.
* This method will return a {@code ResourceBundle} that was either
* set by the {@link
* #setResourceBundle(java.util.ResourceBundle) setResourceBundle} method or
* <a href="#ResourceBundleMapping">mapped from the
* the resource bundle name</a> set via the {@link
* Logger#getLogger(java.lang.String, java.lang.String) getLogger} factory
* method for the current default locale.
* <br>Note that if the result is {@code null}, then the Logger will use a resource
* bundle or resource bundle name inherited from its parent.
*
* @return localization bundle (may be {@code null})
*/
public ResourceBundle getResourceBundle() {
return findResourceBundle(getResourceBundleName(), true);
}
/**
* Retrieve the localization resource bundle name for this
* logger.
* This is either the name specified through the {@link
* #getLogger(java.lang.String, java.lang.String) getLogger} factory method,
* or the {@linkplain ResourceBundle#getBaseBundleName() base name} of the
* ResourceBundle set through {@link
* #setResourceBundle(java.util.ResourceBundle) setResourceBundle} method.
* <br>Note that if the result is {@code null}, then the Logger will use a resource
* bundle or resource bundle name inherited from its parent.
*
* @return localization bundle name (may be {@code null})
*/
public String getResourceBundleName() {
return loggerBundle.resourceBundleName;
}
/**
* Set a filter to control output on this Logger.
* <P>
* After passing the initial "level" check, the Logger will
* call this Filter to check if a log record should really
* be published.
*
* @param newFilter a filter object (may be null)
* @throws SecurityException if a security manager exists,
* this logger is not anonymous, and the caller
* does not have LoggingPermission("control").
*/
public void setFilter(Filter newFilter) throws SecurityException {
checkPermission();
config.setFilter(newFilter);
}
/**
* Get the current filter for this Logger.
*
* @return a filter object (may be null)
*/
public Filter getFilter() {
return config.filter;
}
/**
* Log a LogRecord.
* <p>
* All the other logging methods in this class call through
* this method to actually perform any logging. Subclasses can
* override this single method to capture all log activity.
*
* @param record the LogRecord to be published
*/
public void log(LogRecord record) {
if (!isLoggable(record.getLevel())) {
return;
}
Filter theFilter = config.filter;
if (theFilter != null && !theFilter.isLoggable(record)) {
return;
}
// Post the LogRecord to all our Handlers, and then to
// our parents' handlers, all the way up the tree.
Logger logger = this;
while (logger != null) {
final Handler[] loggerHandlers = isSystemLogger
? logger.accessCheckedHandlers()
: logger.getHandlers();
for (Handler handler : loggerHandlers) {
handler.publish(record);
}
final boolean useParentHdls = isSystemLogger
? logger.config.useParentHandlers
: logger.getUseParentHandlers();
if (!useParentHdls) {
break;
}
logger = isSystemLogger ? logger.parent : logger.getParent();
}
}
// private support method for logging.
// We fill in the logger name, resource bundle name, and
// resource bundle and then call "void log(LogRecord)".
private void doLog(LogRecord lr) {
lr.setLoggerName(name);
final LoggerBundle lb = getEffectiveLoggerBundle();
final ResourceBundle bundle = lb.userBundle;
final String ebname = lb.resourceBundleName;
if (ebname != null && bundle != null) {
lr.setResourceBundleName(ebname);
lr.setResourceBundle(bundle);
}
log(lr);
}
//================================================================
// Start of convenience methods WITHOUT className and methodName
//================================================================
/**
* Log a message, with no arguments.
* <p>
* If the logger is currently enabled for the given message
* level then the given message is forwarded to all the
* registered output Handler objects.
*
* @param level One of the message level identifiers, e.g., SEVERE
* @param msg The string message (or a key in the message catalog)
*/
public void log(Level level, String msg) {
if (!isLoggable(level)) {
return;
}
LogRecord lr = new LogRecord(level, msg);
doLog(lr);
}
/**
* Log a message, which is only to be constructed if the logging level
* is such that the message will actually be logged.
* <p>
* If the logger is currently enabled for the given message
* level then the message is constructed by invoking the provided
* supplier function and forwarded to all the registered output
* Handler objects.
*
* @param level One of the message level identifiers, e.g., SEVERE
* @param msgSupplier A function, which when called, produces the
* desired log message
* @since 1.8
*/
public void log(Level level, Supplier<String> msgSupplier) {
if (!isLoggable(level)) {
return;
}
LogRecord lr = new LogRecord(level, msgSupplier.get());
doLog(lr);
}
/**
* Log a message, with one object parameter.
* <p>
* If the logger is currently enabled for the given message
* level then a corresponding LogRecord is created and forwarded
* to all the registered output Handler objects.
*
* @param level One of the message level identifiers, e.g., SEVERE
* @param msg The string message (or a key in the message catalog)
* @param param1 parameter to the message
*/
public void log(Level level, String msg, Object param1) {
if (!isLoggable(level)) {
return;
}
LogRecord lr = new LogRecord(level, msg);
Object params[] = { param1 };
lr.setParameters(params);
doLog(lr);
}
/**
* Log a message, with an array of object arguments.
* <p>
* If the logger is currently enabled for the given message
* level then a corresponding LogRecord is created and forwarded
* to all the registered output Handler objects.
*
* @param level One of the message level identifiers, e.g., SEVERE
* @param msg The string message (or a key in the message catalog)
* @param params array of parameters to the message
*/
public void log(Level level, String msg, Object params[]) {
if (!isLoggable(level)) {
return;
}
LogRecord lr = new LogRecord(level, msg);
lr.setParameters(params);
doLog(lr);
}
/**
* Log a message, with associated Throwable information.
* <p>
* If the logger is currently enabled for the given message
* level then the given arguments are stored in a LogRecord
* which is forwarded to all registered output handlers.
* <p>
* Note that the thrown argument is stored in the LogRecord thrown
* property, rather than the LogRecord parameters property. Thus it is
* processed specially by output Formatters and is not treated
* as a formatting parameter to the LogRecord message property.
*
* @param level One of the message level identifiers, e.g., SEVERE
* @param msg The string message (or a key in the message catalog)
* @param thrown Throwable associated with log message.
*/
public void log(Level level, String msg, Throwable thrown) {
if (!isLoggable(level)) {
return;
}
LogRecord lr = new LogRecord(level, msg);
lr.setThrown(thrown);
doLog(lr);
}
/**
* Log a lazily constructed message, with associated Throwable information.
* <p>
* If the logger is currently enabled for the given message level then the
* message is constructed by invoking the provided supplier function. The
* message and the given {@link Throwable} are then stored in a {@link
* LogRecord} which is forwarded to all registered output handlers.
* <p>
* Note that the thrown argument is stored in the LogRecord thrown
* property, rather than the LogRecord parameters property. Thus it is
* processed specially by output Formatters and is not treated
* as a formatting parameter to the LogRecord message property.
*
* @param level One of the message level identifiers, e.g., SEVERE
* @param thrown Throwable associated with log message.
* @param msgSupplier A function, which when called, produces the
* desired log message
* @since 1.8
*/
public void log(Level level, Throwable thrown, Supplier<String> msgSupplier) {
if (!isLoggable(level)) {
return;
}
LogRecord lr = new LogRecord(level, msgSupplier.get());
lr.setThrown(thrown);
doLog(lr);
}
//================================================================
// Start of convenience methods WITH className and methodName
//================================================================
/**
* Log a message, specifying source class and method,
* with no arguments.
* <p>
* If the logger is currently enabled for the given message
* level then the given message is forwarded to all the
* registered output Handler objects.
*
* @param level One of the message level identifiers, e.g., SEVERE
* @param sourceClass name of class that issued the logging request
* @param sourceMethod name of method that issued the logging request
* @param msg The string message (or a key in the message catalog)
*/
public void logp(Level level, String sourceClass, String sourceMethod, String msg) {
if (!isLoggable(level)) {
return;
}
LogRecord lr = new LogRecord(level, msg);
lr.setSourceClassName(sourceClass);
lr.setSourceMethodName(sourceMethod);
doLog(lr);
}
/**
* Log a lazily constructed message, specifying source class and method,
* with no arguments.
* <p>
* If the logger is currently enabled for the given message
* level then the message is constructed by invoking the provided
* supplier function and forwarded to all the registered output
* Handler objects.
*
* @param level One of the message level identifiers, e.g., SEVERE
* @param sourceClass name of class that issued the logging request
* @param sourceMethod name of method that issued the logging request
* @param msgSupplier A function, which when called, produces the
* desired log message
* @since 1.8
*/
public void logp(Level level, String sourceClass, String sourceMethod,
Supplier<String> msgSupplier) {
if (!isLoggable(level)) {
return;
}
LogRecord lr = new LogRecord(level, msgSupplier.get());
lr.setSourceClassName(sourceClass);
lr.setSourceMethodName(sourceMethod);
doLog(lr);
}
/**
* Log a message, specifying source class and method,
* with a single object parameter to the log message.
* <p>
* If the logger is currently enabled for the given message
* level then a corresponding LogRecord is created and forwarded
* to all the registered output Handler objects.
*
* @param level One of the message level identifiers, e.g., SEVERE
* @param sourceClass name of class that issued the logging request
* @param sourceMethod name of method that issued the logging request
* @param msg The string message (or a key in the message catalog)
* @param param1 Parameter to the log message.
*/
public void logp(Level level, String sourceClass, String sourceMethod,
String msg, Object param1) {
if (!isLoggable(level)) {
return;
}
LogRecord lr = new LogRecord(level, msg);
lr.setSourceClassName(sourceClass);
lr.setSourceMethodName(sourceMethod);
Object params[] = { param1 };
lr.setParameters(params);
doLog(lr);
}
/**
* Log a message, specifying source class and method,
* with an array of object arguments.
* <p>
* If the logger is currently enabled for the given message
* level then a corresponding LogRecord is created and forwarded
* to all the registered output Handler objects.
*
* @param level One of the message level identifiers, e.g., SEVERE
* @param sourceClass name of class that issued the logging request
* @param sourceMethod name of method that issued the logging request
* @param msg The string message (or a key in the message catalog)
* @param params Array of parameters to the message
*/
public void logp(Level level, String sourceClass, String sourceMethod,
String msg, Object params[]) {
if (!isLoggable(level)) {
return;
}
LogRecord lr = new LogRecord(level, msg);
lr.setSourceClassName(sourceClass);
lr.setSourceMethodName(sourceMethod);
lr.setParameters(params);
doLog(lr);
}
/**
* Log a message, specifying source class and method,
* with associated Throwable information.
* <p>
* If the logger is currently enabled for the given message
* level then the given arguments are stored in a LogRecord
* which is forwarded to all registered output handlers.
* <p>
* Note that the thrown argument is stored in the LogRecord thrown
* property, rather than the LogRecord parameters property. Thus it is
* processed specially by output Formatters and is not treated
* as a formatting parameter to the LogRecord message property.
*
* @param level One of the message level identifiers, e.g., SEVERE
* @param sourceClass name of class that issued the logging request
* @param sourceMethod name of method that issued the logging request
* @param msg The string message (or a key in the message catalog)
* @param thrown Throwable associated with log message.
*/
public void logp(Level level, String sourceClass, String sourceMethod,
String msg, Throwable thrown) {
if (!isLoggable(level)) {
return;
}
LogRecord lr = new LogRecord(level, msg);
lr.setSourceClassName(sourceClass);
lr.setSourceMethodName(sourceMethod);
lr.setThrown(thrown);
doLog(lr);
}
/**
* Log a lazily constructed message, specifying source class and method,
* with associated Throwable information.
* <p>
* If the logger is currently enabled for the given message level then the
* message is constructed by invoking the provided supplier function. The
* message and the given {@link Throwable} are then stored in a {@link
* LogRecord} which is forwarded to all registered output handlers.
* <p>
* Note that the thrown argument is stored in the LogRecord thrown
* property, rather than the LogRecord parameters property. Thus it is
* processed specially by output Formatters and is not treated
* as a formatting parameter to the LogRecord message property.
*
* @param level One of the message level identifiers, e.g., SEVERE
* @param sourceClass name of class that issued the logging request
* @param sourceMethod name of method that issued the logging request
* @param thrown Throwable associated with log message.
* @param msgSupplier A function, which when called, produces the
* desired log message
* @since 1.8
*/
public void logp(Level level, String sourceClass, String sourceMethod,
Throwable thrown, Supplier<String> msgSupplier) {
if (!isLoggable(level)) {
return;
}
LogRecord lr = new LogRecord(level, msgSupplier.get());
lr.setSourceClassName(sourceClass);
lr.setSourceMethodName(sourceMethod);
lr.setThrown(thrown);
doLog(lr);
}
//=========================================================================
// Start of convenience methods WITH className, methodName and bundle name.
//=========================================================================
// Private support method for logging for "logrb" methods.
// We fill in the logger name, resource bundle name, and
// resource bundle and then call "void log(LogRecord)".
private void doLog(LogRecord lr, String rbname) {
lr.setLoggerName(name);
if (rbname != null) {
lr.setResourceBundleName(rbname);
lr.setResourceBundle(findResourceBundle(rbname, false));
}
log(lr);
}
// Private support method for logging for "logrb" methods.
private void doLog(LogRecord lr, ResourceBundle rb) {
lr.setLoggerName(name);
if (rb != null) {
lr.setResourceBundleName(rb.getBaseBundleName());
lr.setResourceBundle(rb);
}
log(lr);
}
/**
* Log a message, specifying source class, method, and resource bundle name
* with no arguments.
* <p>
* If the logger is currently enabled for the given message
* level then the given message is forwarded to all the
* registered output Handler objects.
* <p>
* The msg string is localized using the named resource bundle. If the
* resource bundle name is null, or an empty String or invalid
* then the msg string is not localized.
*
* @param level One of the message level identifiers, e.g., SEVERE
* @param sourceClass name of class that issued the logging request
* @param sourceMethod name of method that issued the logging request
* @param bundleName name of resource bundle to localize msg,
* can be null
* @param msg The string message (or a key in the message catalog)
* @deprecated Use {@link #logrb(java.util.logging.Level, java.lang.String,
* java.lang.String, java.util.ResourceBundle, java.lang.String,
* java.lang.Object...)} instead.
*/
@Deprecated
public void logrb(Level level, String sourceClass, String sourceMethod,
String bundleName, String msg) {
if (!isLoggable(level)) {
return;
}
LogRecord lr = new LogRecord(level, msg);
lr.setSourceClassName(sourceClass);
lr.setSourceMethodName(sourceMethod);
doLog(lr, bundleName);
}
/**
* Log a message, specifying source class, method, and resource bundle name,
* with a single object parameter to the log message.
* <p>
* If the logger is currently enabled for the given message
* level then a corresponding LogRecord is created and forwarded
* to all the registered output Handler objects.
* <p>
* The msg string is localized using the named resource bundle. If the
* resource bundle name is null, or an empty String or invalid
* then the msg string is not localized.
*
* @param level One of the message level identifiers, e.g., SEVERE
* @param sourceClass name of class that issued the logging request
* @param sourceMethod name of method that issued the logging request
* @param bundleName name of resource bundle to localize msg,
* can be null
* @param msg The string message (or a key in the message catalog)
* @param param1 Parameter to the log message.
* @deprecated Use {@link #logrb(java.util.logging.Level, java.lang.String,
* java.lang.String, java.util.ResourceBundle, java.lang.String,
* java.lang.Object...)} instead
*/
@Deprecated
public void logrb(Level level, String sourceClass, String sourceMethod,
String bundleName, String msg, Object param1) {
if (!isLoggable(level)) {
return;
}
LogRecord lr = new LogRecord(level, msg);
lr.setSourceClassName(sourceClass);
lr.setSourceMethodName(sourceMethod);
Object params[] = { param1 };
lr.setParameters(params);
doLog(lr, bundleName);
}
/**
* Log a message, specifying source class, method, and resource bundle name,
* with an array of object arguments.
* <p>
* If the logger is currently enabled for the given message
* level then a corresponding LogRecord is created and forwarded
* to all the registered output Handler objects.
* <p>
* The msg string is localized using the named resource bundle. If the
* resource bundle name is null, or an empty String or invalid
* then the msg string is not localized.
*
* @param level One of the message level identifiers, e.g., SEVERE
* @param sourceClass name of class that issued the logging request
* @param sourceMethod name of method that issued the logging request
* @param bundleName name of resource bundle to localize msg,
* can be null.
* @param msg The string message (or a key in the message catalog)
* @param params Array of parameters to the message
* @deprecated Use {@link #logrb(java.util.logging.Level, java.lang.String,
* java.lang.String, java.util.ResourceBundle, java.lang.String,
* java.lang.Object...)} instead.
*/
@Deprecated
public void logrb(Level level, String sourceClass, String sourceMethod,
String bundleName, String msg, Object params[]) {
if (!isLoggable(level)) {
return;
}
LogRecord lr = new LogRecord(level, msg);
lr.setSourceClassName(sourceClass);
lr.setSourceMethodName(sourceMethod);
lr.setParameters(params);
doLog(lr, bundleName);
}
/**
* Log a message, specifying source class, method, and resource bundle,
* with an optional list of message parameters.
* <p>
* If the logger is currently enabled for the given message
* {@code level} then a corresponding {@code LogRecord} is created and
* forwarded to all the registered output {@code Handler} objects.
* <p>
* The {@code msg} string is localized using the given resource bundle.
* If the resource bundle is {@code null}, then the {@code msg} string is not
* localized.
*
* @param level One of the message level identifiers, e.g., {@code SEVERE}
* @param sourceClass Name of the class that issued the logging request
* @param sourceMethod Name of the method that issued the logging request
* @param bundle Resource bundle to localize {@code msg},
* can be {@code null}.
* @param msg The string message (or a key in the message catalog)
* @param params Parameters to the message (optional, may be none).
* @since 1.8
*/
public void logrb(Level level, String sourceClass, String sourceMethod,
ResourceBundle bundle, String msg, Object... params) {
if (!isLoggable(level)) {
return;
}
LogRecord lr = new LogRecord(level, msg);
lr.setSourceClassName(sourceClass);
lr.setSourceMethodName(sourceMethod);
if (params != null && params.length != 0) {
lr.setParameters(params);
}
doLog(lr, bundle);
}
/**
* Log a message, specifying source class, method, and resource bundle,
* with an optional list of message parameters.
* <p>
* If the logger is currently enabled for the given message
* {@code level} then a corresponding {@code LogRecord} is created
* and forwarded to all the registered output {@code Handler} objects.
* <p>
* The {@code msg} string is localized using the given resource bundle.
* If the resource bundle is {@code null}, then the {@code msg} string is not
* localized.
*
* @param level One of the message level identifiers, e.g., {@code SEVERE}
* @param bundle Resource bundle to localize {@code msg};
* can be {@code null}.
* @param msg The string message (or a key in the message catalog)
* @param params Parameters to the message (optional, may be none).
* @since 9
*/
public void logrb(Level level, ResourceBundle bundle, String msg, Object... params) {
if (!isLoggable(level)) {
return;
}
LogRecord lr = new LogRecord(level, msg);
if (params != null && params.length != 0) {
lr.setParameters(params);
}
doLog(lr, bundle);
}
/**
* Log a message, specifying source class, method, and resource bundle name,
* with associated Throwable information.
* <p>
* If the logger is currently enabled for the given message
* level then the given arguments are stored in a LogRecord
* which is forwarded to all registered output handlers.
* <p>
* The msg string is localized using the named resource bundle. If the
* resource bundle name is null, or an empty String or invalid
* then the msg string is not localized.
* <p>
* Note that the thrown argument is stored in the LogRecord thrown
* property, rather than the LogRecord parameters property. Thus it is
* processed specially by output Formatters and is not treated
* as a formatting parameter to the LogRecord message property.
*
* @param level One of the message level identifiers, e.g., SEVERE
* @param sourceClass name of class that issued the logging request
* @param sourceMethod name of method that issued the logging request
* @param bundleName name of resource bundle to localize msg,
* can be null
* @param msg The string message (or a key in the message catalog)
* @param thrown Throwable associated with log message.
* @deprecated Use {@link #logrb(java.util.logging.Level, java.lang.String,
* java.lang.String, java.util.ResourceBundle, java.lang.String,
* java.lang.Throwable)} instead.
*/
@Deprecated
public void logrb(Level level, String sourceClass, String sourceMethod,
String bundleName, String msg, Throwable thrown) {
if (!isLoggable(level)) {
return;
}
LogRecord lr = new LogRecord(level, msg);
lr.setSourceClassName(sourceClass);
lr.setSourceMethodName(sourceMethod);
lr.setThrown(thrown);
doLog(lr, bundleName);
}
/**
* Log a message, specifying source class, method, and resource bundle,
* with associated Throwable information.
* <p>
* If the logger is currently enabled for the given message
* {@code level} then the given arguments are stored in a {@code LogRecord}
* which is forwarded to all registered output handlers.
* <p>
* The {@code msg} string is localized using the given resource bundle.
* If the resource bundle is {@code null}, then the {@code msg} string is not
* localized.
* <p>
* Note that the {@code thrown} argument is stored in the {@code LogRecord}
* {@code thrown} property, rather than the {@code LogRecord}
* {@code parameters} property. Thus it is
* processed specially by output {@code Formatter} objects and is not treated
* as a formatting parameter to the {@code LogRecord} {@code message} property.
*
* @param level One of the message level identifiers, e.g., {@code SEVERE}
* @param sourceClass Name of the class that issued the logging request
* @param sourceMethod Name of the method that issued the logging request
* @param bundle Resource bundle to localize {@code msg},
* can be {@code null}
* @param msg The string message (or a key in the message catalog)
* @param thrown Throwable associated with the log message.
* @since 1.8
*/
public void logrb(Level level, String sourceClass, String sourceMethod,
ResourceBundle bundle, String msg, Throwable thrown) {
if (!isLoggable(level)) {
return;
}
LogRecord lr = new LogRecord(level, msg);
lr.setSourceClassName(sourceClass);
lr.setSourceMethodName(sourceMethod);
lr.setThrown(thrown);
doLog(lr, bundle);
}
/**
* Log a message, specifying source class, method, and resource bundle,
* with associated Throwable information.
* <p>
* If the logger is currently enabled for the given message
* {@code level} then the given arguments are stored in a {@code LogRecord}
* which is forwarded to all registered output handlers.
* <p>
* The {@code msg} string is localized using the given resource bundle.
* If the resource bundle is {@code null}, then the {@code msg} string is not
* localized.
* <p>
* Note that the {@code thrown} argument is stored in the {@code LogRecord}
* {@code thrown} property, rather than the {@code LogRecord}
* {@code parameters} property. Thus it is
* processed specially by output {@code Formatter} objects and is not treated
* as a formatting parameter to the {@code LogRecord} {@code message}
* property.
*
* @param level One of the message level identifiers, e.g., {@code SEVERE}
* @param bundle Resource bundle to localize {@code msg};
* can be {@code null}.
* @param msg The string message (or a key in the message catalog)
* @param thrown Throwable associated with the log message.
* @since 9
*/
public void logrb(Level level, ResourceBundle bundle, String msg,
Throwable thrown) {
if (!isLoggable(level)) {
return;
}
LogRecord lr = new LogRecord(level, msg);
lr.setThrown(thrown);
doLog(lr, bundle);
}
//======================================================================
// Start of convenience methods for logging method entries and returns.
//======================================================================
/**
* Log a method entry.
* <p>
* This is a convenience method that can be used to log entry
* to a method. A LogRecord with message "ENTRY", log level
* FINER, and the given sourceMethod and sourceClass is logged.
*
* @param sourceClass name of class that issued the logging request
* @param sourceMethod name of method that is being entered
*/
public void entering(String sourceClass, String sourceMethod) {
logp(Level.FINER, sourceClass, sourceMethod, "ENTRY");
}
/**
* Log a method entry, with one parameter.
* <p>
* This is a convenience method that can be used to log entry
* to a method. A LogRecord with message "ENTRY {0}", log level
* FINER, and the given sourceMethod, sourceClass, and parameter
* is logged.
*
* @param sourceClass name of class that issued the logging request
* @param sourceMethod name of method that is being entered
* @param param1 parameter to the method being entered
*/
public void entering(String sourceClass, String sourceMethod, Object param1) {
logp(Level.FINER, sourceClass, sourceMethod, "ENTRY {0}", param1);
}
/**
* Log a method entry, with an array of parameters.
* <p>
* This is a convenience method that can be used to log entry
* to a method. A LogRecord with message "ENTRY" (followed by a
* format {N} indicator for each entry in the parameter array),
* log level FINER, and the given sourceMethod, sourceClass, and
* parameters is logged.
*
* @param sourceClass name of class that issued the logging request
* @param sourceMethod name of method that is being entered
* @param params array of parameters to the method being entered
*/
public void entering(String sourceClass, String sourceMethod, Object params[]) {
String msg = "ENTRY";
if (params == null ) {
logp(Level.FINER, sourceClass, sourceMethod, msg);
return;
}
if (!isLoggable(Level.FINER)) return;
if (params.length > 0) {
final StringBuilder b = new StringBuilder(msg);
for (int i = 0; i < params.length; i++) {
b.append(' ').append('{').append(i).append('}');
}
msg = b.toString();
}
logp(Level.FINER, sourceClass, sourceMethod, msg, params);
}
/**
* Log a method return.
* <p>
* This is a convenience method that can be used to log returning
* from a method. A LogRecord with message "RETURN", log level
* FINER, and the given sourceMethod and sourceClass is logged.
*
* @param sourceClass name of class that issued the logging request
* @param sourceMethod name of the method
*/
public void exiting(String sourceClass, String sourceMethod) {
logp(Level.FINER, sourceClass, sourceMethod, "RETURN");
}
/**
* Log a method return, with result object.
* <p>
* This is a convenience method that can be used to log returning
* from a method. A LogRecord with message "RETURN {0}", log level
* FINER, and the gives sourceMethod, sourceClass, and result
* object is logged.
*
* @param sourceClass name of class that issued the logging request
* @param sourceMethod name of the method
* @param result Object that is being returned
*/
public void exiting(String sourceClass, String sourceMethod, Object result) {
logp(Level.FINER, sourceClass, sourceMethod, "RETURN {0}", result);
}
/**
* Log throwing an exception.
* <p>
* This is a convenience method to log that a method is
* terminating by throwing an exception. The logging is done
* using the FINER level.
* <p>
* If the logger is currently enabled for the given message
* level then the given arguments are stored in a LogRecord
* which is forwarded to all registered output handlers. The
* LogRecord's message is set to "THROW".
* <p>
* Note that the thrown argument is stored in the LogRecord thrown
* property, rather than the LogRecord parameters property. Thus it is
* processed specially by output Formatters and is not treated
* as a formatting parameter to the LogRecord message property.
*
* @param sourceClass name of class that issued the logging request
* @param sourceMethod name of the method.
* @param thrown The Throwable that is being thrown.
*/
public void throwing(String sourceClass, String sourceMethod, Throwable thrown) {
if (!isLoggable(Level.FINER)) {
return;
}
LogRecord lr = new LogRecord(Level.FINER, "THROW");
lr.setSourceClassName(sourceClass);
lr.setSourceMethodName(sourceMethod);
lr.setThrown(thrown);
doLog(lr);
}
//=======================================================================
// Start of simple convenience methods using level names as method names
//=======================================================================
/**
* Log a SEVERE message.
* <p>
* If the logger is currently enabled for the SEVERE message
* level then the given message is forwarded to all the
* registered output Handler objects.
*
* @param msg The string message (or a key in the message catalog)
*/
public void severe(String msg) {
log(Level.SEVERE, msg);
}
/**
* Log a WARNING message.
* <p>
* If the logger is currently enabled for the WARNING message
* level then the given message is forwarded to all the
* registered output Handler objects.
*
* @param msg The string message (or a key in the message catalog)
*/
public void warning(String msg) {
log(Level.WARNING, msg);
}
/**
* Log an INFO message.
* <p>
* If the logger is currently enabled for the INFO message
* level then the given message is forwarded to all the
* registered output Handler objects.
*
* @param msg The string message (or a key in the message catalog)
*/
public void info(String msg) {
log(Level.INFO, msg);
}
/**
* Log a CONFIG message.
* <p>
* If the logger is currently enabled for the CONFIG message
* level then the given message is forwarded to all the
* registered output Handler objects.
*
* @param msg The string message (or a key in the message catalog)
*/
public void config(String msg) {
log(Level.CONFIG, msg);
}
/**
* Log a FINE message.
* <p>
* If the logger is currently enabled for the FINE message
* level then the given message is forwarded to all the
* registered output Handler objects.
*
* @param msg The string message (or a key in the message catalog)
*/
public void fine(String msg) {
log(Level.FINE, msg);
}
/**
* Log a FINER message.
* <p>
* If the logger is currently enabled for the FINER message
* level then the given message is forwarded to all the
* registered output Handler objects.
*
* @param msg The string message (or a key in the message catalog)
*/
public void finer(String msg) {
log(Level.FINER, msg);
}
/**
* Log a FINEST message.
* <p>
* If the logger is currently enabled for the FINEST message
* level then the given message is forwarded to all the
* registered output Handler objects.
*
* @param msg The string message (or a key in the message catalog)
*/
public void finest(String msg) {
log(Level.FINEST, msg);
}
//=======================================================================
// Start of simple convenience methods using level names as method names
// and use Supplier<String>
//=======================================================================
/**
* Log a SEVERE message, which is only to be constructed if the logging
* level is such that the message will actually be logged.
* <p>
* If the logger is currently enabled for the SEVERE message
* level then the message is constructed by invoking the provided
* supplier function and forwarded to all the registered output
* Handler objects.
*
* @param msgSupplier A function, which when called, produces the
* desired log message
* @since 1.8
*/
public void severe(Supplier<String> msgSupplier) {
log(Level.SEVERE, msgSupplier);
}
/**
* Log a WARNING message, which is only to be constructed if the logging
* level is such that the message will actually be logged.
* <p>
* If the logger is currently enabled for the WARNING message
* level then the message is constructed by invoking the provided
* supplier function and forwarded to all the registered output
* Handler objects.
*
* @param msgSupplier A function, which when called, produces the
* desired log message
* @since 1.8
*/
public void warning(Supplier<String> msgSupplier) {
log(Level.WARNING, msgSupplier);
}
/**
* Log a INFO message, which is only to be constructed if the logging
* level is such that the message will actually be logged.
* <p>
* If the logger is currently enabled for the INFO message
* level then the message is constructed by invoking the provided
* supplier function and forwarded to all the registered output
* Handler objects.
*
* @param msgSupplier A function, which when called, produces the
* desired log message
* @since 1.8
*/
public void info(Supplier<String> msgSupplier) {
log(Level.INFO, msgSupplier);
}
/**
* Log a CONFIG message, which is only to be constructed if the logging
* level is such that the message will actually be logged.
* <p>
* If the logger is currently enabled for the CONFIG message
* level then the message is constructed by invoking the provided
* supplier function and forwarded to all the registered output
* Handler objects.
*
* @param msgSupplier A function, which when called, produces the
* desired log message
* @since 1.8
*/
public void config(Supplier<String> msgSupplier) {
log(Level.CONFIG, msgSupplier);
}
/**
* Log a FINE message, which is only to be constructed if the logging
* level is such that the message will actually be logged.
* <p>
* If the logger is currently enabled for the FINE message
* level then the message is constructed by invoking the provided
* supplier function and forwarded to all the registered output
* Handler objects.
*
* @param msgSupplier A function, which when called, produces the
* desired log message
* @since 1.8
*/
public void fine(Supplier<String> msgSupplier) {
log(Level.FINE, msgSupplier);
}
/**
* Log a FINER message, which is only to be constructed if the logging
* level is such that the message will actually be logged.
* <p>
* If the logger is currently enabled for the FINER message
* level then the message is constructed by invoking the provided
* supplier function and forwarded to all the registered output
* Handler objects.
*
* @param msgSupplier A function, which when called, produces the
* desired log message
* @since 1.8
*/
public void finer(Supplier<String> msgSupplier) {
log(Level.FINER, msgSupplier);
}
/**
* Log a FINEST message, which is only to be constructed if the logging
* level is such that the message will actually be logged.
* <p>
* If the logger is currently enabled for the FINEST message
* level then the message is constructed by invoking the provided
* supplier function and forwarded to all the registered output
* Handler objects.
*
* @param msgSupplier A function, which when called, produces the
* desired log message
* @since 1.8
*/
public void finest(Supplier<String> msgSupplier) {
log(Level.FINEST, msgSupplier);
}
//================================================================
// End of convenience methods
//================================================================
/**
* Set the log level specifying which message levels will be
* logged by this logger. Message levels lower than this
* value will be discarded. The level value Level.OFF
* can be used to turn off logging.
* <p>
* If the new level is null, it means that this node should
* inherit its level from its nearest ancestor with a specific
* (non-null) level value.
*
* @param newLevel the new value for the log level (may be null)
* @throws SecurityException if a security manager exists,
* this logger is not anonymous, and the caller
* does not have LoggingPermission("control").
*/
public void setLevel(Level newLevel) throws SecurityException {
checkPermission();
synchronized (treeLock) {
config.setLevelObject(newLevel);
updateEffectiveLevel();
}
}
final boolean isLevelInitialized() {
return config.levelObject != null;
}
/**
* Get the log Level that has been specified for this Logger.
* The result may be null, which means that this logger's
* effective level will be inherited from its parent.
*
* @return this Logger's level
*/
public Level getLevel() {
return config.levelObject;
}
/**
* Check if a message of the given level would actually be logged
* by this logger. This check is based on the Loggers effective level,
* which may be inherited from its parent.
*
* @param level a message logging level
* @return true if the given message level is currently being logged.
*/
public boolean isLoggable(Level level) {
int levelValue = config.levelValue;
if (level.intValue() < levelValue || levelValue == offValue) {
return false;
}
return true;
}
/**
* Get the name for this logger.
* @return logger name. Will be null for anonymous Loggers.
*/
public String getName() {
return name;
}
/**
* Add a log Handler to receive logging messages.
* <p>
* By default, Loggers also send their output to their parent logger.
* Typically the root Logger is configured with a set of Handlers
* that essentially act as default handlers for all loggers.
*
* @param handler a logging Handler
* @throws SecurityException if a security manager exists,
* this logger is not anonymous, and the caller
* does not have LoggingPermission("control").
*/
public void addHandler(Handler handler) throws SecurityException {
Objects.requireNonNull(handler);
checkPermission();
config.addHandler(handler);
}
/**
* Remove a log Handler.
* <P>
* Returns silently if the given Handler is not found or is null
*
* @param handler a logging Handler
* @throws SecurityException if a security manager exists,
* this logger is not anonymous, and the caller
* does not have LoggingPermission("control").
*/
public void removeHandler(Handler handler) throws SecurityException {
checkPermission();
if (handler == null) {
return;
}
config.removeHandler(handler);
}
/**
* Get the Handlers associated with this logger.
*
* @return an array of all registered Handlers
*/
public Handler[] getHandlers() {
return accessCheckedHandlers();
}
// This method should ideally be marked final - but unfortunately
// it needs to be overridden by LogManager.RootLogger
Handler[] accessCheckedHandlers() {
return config.handlers.toArray(emptyHandlers);
}
/**
* Specify whether or not this logger should send its output
* to its parent Logger. This means that any LogRecords will
* also be written to the parent's Handlers, and potentially
* to its parent, recursively up the namespace.
*
* @param useParentHandlers true if output is to be sent to the
* logger's parent.
* @throws SecurityException if a security manager exists,
* this logger is not anonymous, and the caller
* does not have LoggingPermission("control").
*/
public void setUseParentHandlers(boolean useParentHandlers) {
checkPermission();
config.setUseParentHandlers(useParentHandlers);
}
/**
* Discover whether or not this logger is sending its output
* to its parent logger.
*
* @return true if output is to be sent to the logger's parent
*/
public boolean getUseParentHandlers() {
return config.useParentHandlers;
}
private ResourceBundle catalog() {
WeakReference<ResourceBundle> ref = catalogRef;
return ref == null ? null : ref.get();
}
/**
* Private utility method to map a resource bundle name to an
* actual resource bundle, using a simple one-entry cache.
* Returns null for a null name.
* May also return null if we can't find the resource bundle and
* there is no suitable previous cached value.
*
* @param name the ResourceBundle to locate
* @param useCallersModule if true search using the caller's module.
* @return ResourceBundle specified by name or null if not found
*/
private synchronized ResourceBundle findResourceBundle(String name,
boolean useCallersModule) {
// When this method is called from logrb, useCallersModule==false, and
// the resource bundle 'name' is the argument provided to logrb.
// It may, or may not be, equal to lb.resourceBundleName.
// Otherwise, useCallersModule==true, and name is the resource bundle
// name that is set (or will be set) in this logger.
//
// When useCallersModule is false, or when the caller's module is
// null, or when the caller's module is an unnamed module, we look
// first in the TCCL (or the System ClassLoader if the TCCL is null)
// to locate the resource bundle.
//
// Otherwise, if useCallersModule is true, and the caller's module is not
// null, and the caller's module is named, we look in the caller's module
// to locate the resource bundle.
//
// Finally, if the caller's module is not null and is unnamed, and
// useCallersModule is true, we look in the caller's module class loader
// (unless we already looked there in step 1).
// Return a null bundle for a null name.
if (name == null) {
return null;
}
Locale currentLocale = Locale.getDefault();
final LoggerBundle lb = loggerBundle;
ResourceBundle catalog = catalog();
// Normally we should hit on our simple one entry cache.
if (lb.userBundle != null &&
name.equals(lb.resourceBundleName)) {
return lb.userBundle;
} else if (catalog != null && currentLocale.equals(catalogLocale)
&& name.equals(catalogName)) {
return catalog;
}
// Use the thread's context ClassLoader. If there isn't one, use the
// {@linkplain java.lang.ClassLoader#getSystemClassLoader() system ClassLoader}.
ClassLoader cl = Thread.currentThread().getContextClassLoader();
if (cl == null) {
cl = ClassLoader.getSystemClassLoader();
}
final Module callerModule = getCallerModule();
// If useCallersModule is false, we are called by logrb, with a name
// that is provided by the user. In that case we will look in the TCCL.
// We also look in the TCCL if callerModule is null or unnamed.
if (!useCallersModule || callerModule == null || !callerModule.isNamed()) {
try {
Module mod = cl.getUnnamedModule();
catalog = RbAccess.RB_ACCESS.getBundle(name, currentLocale, mod);
catalogRef = new WeakReference<>(catalog);
catalogName = name;
catalogLocale = currentLocale;
return catalog;
} catch (MissingResourceException ex) {
// We can't find the ResourceBundle in the default
// ClassLoader. Drop through.
if (useCallersModule && callerModule != null) {
try {
// We are called by an unnamed module: try with the
// unnamed module class loader:
PrivilegedAction<ClassLoader> getModuleClassLoader =
() -> callerModule.getClassLoader();
@SuppressWarnings("removal")
ClassLoader moduleCL =
AccessController.doPrivileged(getModuleClassLoader);
// moduleCL can be null if the logger is created by a class
// appended to the bootclasspath.
// If moduleCL is null we would use cl, but we already tried
// that above (we first looked in the TCCL for unnamed
// caller modules) - so there no point in trying again: we
// won't find anything more this second time.
// In this case just return null.
if (moduleCL == cl || moduleCL == null) return null;
// we already tried the TCCL and found nothing - so try
// with the module's loader this time.
catalog = ResourceBundle.getBundle(name, currentLocale,
moduleCL);
catalogRef = new WeakReference<>(catalog);
catalogName = name;
catalogLocale = currentLocale;
return catalog;
} catch (MissingResourceException x) {
return null; // no luck
}
} else {
return null;
}
}
} else {
// we should have:
// useCallersModule && callerModule != null && callerModule.isNamed();
// Try with the caller's module
try {
// Use the caller's module
catalog = RbAccess.RB_ACCESS.getBundle(name, currentLocale, callerModule);
catalogRef = new WeakReference<>(catalog);
catalogName = name;
catalogLocale = currentLocale;
return catalog;
} catch (MissingResourceException ex) {
return null; // no luck
}
}
}
private void setupResourceInfo(String name, Class<?> caller) {
final Module module = caller == null ? null : caller.getModule();
setupResourceInfo(name, module);
}
// Private utility method to initialize our one entry
// resource bundle name cache and the callers Module
// Note: for consistency reasons, we are careful to check
// that a suitable ResourceBundle exists before setting the
// resourceBundleName field.
// Synchronized to prevent races in setting the fields.
private synchronized void setupResourceInfo(String name,
Module callerModule) {
final LoggerBundle lb = loggerBundle;
if (lb.resourceBundleName != null) {
// this Logger already has a ResourceBundle
if (lb.resourceBundleName.equals(name)) {
// the names match so there is nothing more to do
return;
}
// cannot change ResourceBundles once they are set
throw new IllegalArgumentException(
lb.resourceBundleName + " != " + name);
}
if (name == null) {
return;
}
setCallerModuleRef(callerModule);
if (isSystemLogger && (callerModule != null && !isSystem(callerModule))) {
checkPermission();
}
if (name.equals(SYSTEM_LOGGER_RB_NAME)) {
loggerBundle = SYSTEM_BUNDLE;
} else {
ResourceBundle bundle = findResourceBundle(name, true);
if (bundle == null) {
// We've failed to find an expected ResourceBundle.
// unset the caller's module since we were unable to find the
// the bundle using it
this.callerModuleRef = null;
throw new MissingResourceException("Can't find " + name + " bundle from ",
name, "");
}
loggerBundle = LoggerBundle.get(name, null);
}
}
/**
* Sets a resource bundle on this logger.
* All messages will be logged using the given resource bundle for its
* specific {@linkplain ResourceBundle#getLocale locale}.
* @param bundle The resource bundle that this logger shall use.
* @throws NullPointerException if the given bundle is {@code null}.
* @throws IllegalArgumentException if the given bundle doesn't have a
* {@linkplain ResourceBundle#getBaseBundleName base name},
* or if this logger already has a resource bundle set but
* the given bundle has a different base name.
* @throws SecurityException if a security manager exists,
* this logger is not anonymous, and the caller
* does not have LoggingPermission("control").
* @since 1.8
*/
public void setResourceBundle(ResourceBundle bundle) {
checkPermission();
// Will throw NPE if bundle is null.
final String baseName = bundle.getBaseBundleName();
// bundle must have a name
if (baseName == null || baseName.isEmpty()) {
throw new IllegalArgumentException("resource bundle must have a name");
}
synchronized (this) {
LoggerBundle lb = loggerBundle;
final boolean canReplaceResourceBundle = lb.resourceBundleName == null
|| lb.resourceBundleName.equals(baseName);
if (!canReplaceResourceBundle) {
throw new IllegalArgumentException("can't replace resource bundle");
}
loggerBundle = LoggerBundle.get(baseName, bundle);
}
}
/**
* Return the parent for this Logger.
* <p>
* This method returns the nearest extant parent in the namespace.
* Thus if a Logger is called "a.b.c.d", and a Logger called "a.b"
* has been created but no logger "a.b.c" exists, then a call of
* getParent on the Logger "a.b.c.d" will return the Logger "a.b".
* <p>
* The result will be null if it is called on the root Logger
* in the namespace.
*
* @return nearest existing parent Logger
*/
public Logger getParent() {
// Note: this used to be synchronized on treeLock. However, this only
// provided memory semantics, as there was no guarantee that the caller
// would synchronize on treeLock (in fact, there is no way for external
// callers to so synchronize). Therefore, we have made parent volatile
// instead.
return parent;
}
/**
* Set the parent for this Logger. This method is used by
* the LogManager to update a Logger when the namespace changes.
* <p>
* It should not be called from application code.
*
* @param parent the new parent logger
* @throws SecurityException if a security manager exists and if
* the caller does not have LoggingPermission("control").
*/
public void setParent(Logger parent) {
if (parent == null) {
throw new NullPointerException();
}
// check permission for all loggers, including anonymous loggers
if (manager == null) {
manager = LogManager.getLogManager();
}
manager.checkPermission();
doSetParent(parent);
}
// Private method to do the work for parenting a child
// Logger onto a parent logger.
private void doSetParent(Logger newParent) {
// System.err.println("doSetParent \"" + getName() + "\" \""
// + newParent.getName() + "\"");
synchronized (treeLock) {
// Remove ourself from any previous parent.
LogManager.LoggerWeakRef ref = null;
if (parent != null) {
// assert parent.kids != null;
for (Iterator<LogManager.LoggerWeakRef> iter = parent.kids.iterator(); iter.hasNext(); ) {
ref = iter.next();
if (ref.refersTo(this)) {
// ref is used down below to complete the reparenting
iter.remove();
break;
} else {
ref = null;
}
}
// We have now removed ourself from our parents' kids.
}
// Set our new parent.
parent = newParent;
if (parent.kids == null) {
parent.kids = new ArrayList<>(2);
}
if (ref == null) {
// we didn't have a previous parent
ref = manager.new LoggerWeakRef(this);
}
ref.setParentRef(new WeakReference<>(parent));
parent.kids.add(ref);
// As a result of the reparenting, the effective level
// may have changed for us and our children.
updateEffectiveLevel();
}
}
// Package-level method.
// Remove the weak reference for the specified child Logger from the
// kid list. We should only be called from LoggerWeakRef.dispose().
final void removeChildLogger(LogManager.LoggerWeakRef child) {
synchronized (treeLock) {
for (Iterator<LogManager.LoggerWeakRef> iter = kids.iterator(); iter.hasNext(); ) {
LogManager.LoggerWeakRef ref = iter.next();
if (ref == child) {
iter.remove();
return;
}
}
}
}
// Recalculate the effective level for this node and
// recursively for our children.
private void updateEffectiveLevel() {
// assert Thread.holdsLock(treeLock);
// Figure out our current effective level.
int newLevelValue;
final ConfigurationData cfg = config;
final Level levelObject = cfg.levelObject;
if (levelObject != null) {
newLevelValue = levelObject.intValue();
} else {
if (parent != null) {
newLevelValue = parent.config.levelValue;
} else {
// This may happen during initialization.
newLevelValue = Level.INFO.intValue();
}
}
// If our effective value hasn't changed, we're done.
if (cfg.levelValue == newLevelValue) {
return;
}
cfg.setLevelValue(newLevelValue);
// System.err.println("effective level: \"" + getName() + "\" := " + level);
// Recursively update the level on each of our kids.
if (kids != null) {
for (LogManager.LoggerWeakRef ref : kids) {
Logger kid = ref.get();
if (kid != null) {
kid.updateEffectiveLevel();
}
}
}
}
// Private method to get the potentially inherited
// resource bundle and resource bundle name for this Logger.
// This method never returns null.
private LoggerBundle getEffectiveLoggerBundle() {
final LoggerBundle lb = loggerBundle;
if (lb.isSystemBundle()) {
return SYSTEM_BUNDLE;
}
// first take care of this logger
final ResourceBundle b = getResourceBundle();
if (b != null && b == lb.userBundle) {
return lb;
} else if (b != null) {
// either lb.userBundle is null or getResourceBundle() is
// overriden
final String rbName = getResourceBundleName();
return LoggerBundle.get(rbName, b);
}
// no resource bundle was specified on this logger, look up the
// parent stack.
Logger target = this.parent;
while (target != null) {
final LoggerBundle trb = target.loggerBundle;
if (trb.isSystemBundle()) {
return SYSTEM_BUNDLE;
}
if (trb.userBundle != null) {
return trb;
}
final String rbName = isSystemLogger
// ancestor of a system logger is expected to be a system logger.
// ignore resource bundle name if it's not.
? (target.isSystemLogger ? trb.resourceBundleName : null)
: target.getResourceBundleName();
if (rbName != null) {
return LoggerBundle.get(rbName,
findResourceBundle(rbName, true));
}
target = isSystemLogger ? target.parent : target.getParent();
}
return NO_RESOURCE_BUNDLE;
}
}
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