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1371 lines
52 KiB
Java
1371 lines
52 KiB
Java
/*
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* Copyright (c) 2000, 2012, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package java.util.logging;
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import java.io.*;
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import java.util.*;
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import java.security.*;
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import java.lang.ref.ReferenceQueue;
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import java.lang.ref.WeakReference;
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import java.lang.reflect.Constructor;
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import java.lang.reflect.InvocationTargetException;
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import java.lang.reflect.Method;
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import java.beans.PropertyChangeListener;
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/**
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* There is a single global LogManager object that is used to
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* maintain a set of shared state about Loggers and log services.
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* <p>
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* This LogManager object:
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* <ul>
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* <li> Manages a hierarchical namespace of Logger objects. All
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* named Loggers are stored in this namespace.
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* <li> Manages a set of logging control properties. These are
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* simple key-value pairs that can be used by Handlers and
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* other logging objects to configure themselves.
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* </ul>
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* <p>
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* The global LogManager object can be retrieved using LogManager.getLogManager().
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* The LogManager object is created during class initialization and
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* cannot subsequently be changed.
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* <p>
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* At startup the LogManager class is located using the
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* java.util.logging.manager system property.
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* <p>
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* The LogManager defines two optional system properties that allow control over
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* the initial configuration:
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* <ul>
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* <li>"java.util.logging.config.class"
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* <li>"java.util.logging.config.file"
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* </ul>
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* These two properties may be specified on the command line to the "java"
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* command, or as system property definitions passed to JNI_CreateJavaVM.
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* <p>
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* If the "java.util.logging.config.class" property is set, then the
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* property value is treated as a class name. The given class will be
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* loaded, an object will be instantiated, and that object's constructor
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* is responsible for reading in the initial configuration. (That object
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* may use other system properties to control its configuration.) The
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* alternate configuration class can use <tt>readConfiguration(InputStream)</tt>
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* to define properties in the LogManager.
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* <p>
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* If "java.util.logging.config.class" property is <b>not</b> set,
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* then the "java.util.logging.config.file" system property can be used
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* to specify a properties file (in java.util.Properties format). The
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* initial logging configuration will be read from this file.
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* <p>
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* If neither of these properties is defined then the LogManager uses its
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* default configuration. The default configuration is typically loaded from the
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* properties file "{@code lib/logging.properties}" in the Java installation
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* directory.
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* <p>
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* The properties for loggers and Handlers will have names starting
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* with the dot-separated name for the handler or logger.
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* <p>
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* The global logging properties may include:
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* <ul>
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* <li>A property "handlers". This defines a whitespace or comma separated
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* list of class names for handler classes to load and register as
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* handlers on the root Logger (the Logger named ""). Each class
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* name must be for a Handler class which has a default constructor.
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* Note that these Handlers may be created lazily, when they are
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* first used.
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*
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* <li>A property "<logger>.handlers". This defines a whitespace or
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* comma separated list of class names for handlers classes to
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* load and register as handlers to the specified logger. Each class
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* name must be for a Handler class which has a default constructor.
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* Note that these Handlers may be created lazily, when they are
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* first used.
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*
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* <li>A property "<logger>.useParentHandlers". This defines a boolean
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* value. By default every logger calls its parent in addition to
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* handling the logging message itself, this often result in messages
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* being handled by the root logger as well. When setting this property
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* to false a Handler needs to be configured for this logger otherwise
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* no logging messages are delivered.
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*
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* <li>A property "config". This property is intended to allow
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* arbitrary configuration code to be run. The property defines a
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* whitespace or comma separated list of class names. A new instance will be
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* created for each named class. The default constructor of each class
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* may execute arbitrary code to update the logging configuration, such as
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* setting logger levels, adding handlers, adding filters, etc.
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* </ul>
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* <p>
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* Note that all classes loaded during LogManager configuration are
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* first searched on the system class path before any user class path.
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* That includes the LogManager class, any config classes, and any
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* handler classes.
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* <p>
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* Loggers are organized into a naming hierarchy based on their
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* dot separated names. Thus "a.b.c" is a child of "a.b", but
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* "a.b1" and a.b2" are peers.
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* <p>
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* All properties whose names end with ".level" are assumed to define
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* log levels for Loggers. Thus "foo.level" defines a log level for
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* the logger called "foo" and (recursively) for any of its children
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* in the naming hierarchy. Log Levels are applied in the order they
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* are defined in the properties file. Thus level settings for child
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* nodes in the tree should come after settings for their parents.
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* The property name ".level" can be used to set the level for the
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* root of the tree.
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* <p>
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* All methods on the LogManager object are multi-thread safe.
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*
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* @since 1.4
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*/
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public class LogManager {
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// The global LogManager object
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private static LogManager manager;
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private final static Handler[] emptyHandlers = { };
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private Properties props = new Properties();
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private final static Level defaultLevel = Level.INFO;
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// The map of the registered listeners. The map value is the registration
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// count to allow for cases where the same listener is registered many times.
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private final Map<Object,Integer> listenerMap = new HashMap<>();
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// Table of named Loggers that maps names to Loggers.
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private Hashtable<String,LoggerWeakRef> namedLoggers = new Hashtable<>();
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// Tree of named Loggers
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private LogNode root = new LogNode(null);
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private Logger rootLogger;
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// Have we done the primordial reading of the configuration file?
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// (Must be done after a suitable amount of java.lang.System
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// initialization has been done)
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private volatile boolean readPrimordialConfiguration;
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// Have we initialized global (root) handlers yet?
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// This gets set to false in readConfiguration
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private boolean initializedGlobalHandlers = true;
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// True if JVM death is imminent and the exit hook has been called.
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private boolean deathImminent;
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static {
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AccessController.doPrivileged(new PrivilegedAction<Object>() {
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public Object run() {
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String cname = null;
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try {
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cname = System.getProperty("java.util.logging.manager");
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if (cname != null) {
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try {
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Class<?> clz = ClassLoader.getSystemClassLoader().loadClass(cname);
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manager = (LogManager) clz.newInstance();
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} catch (ClassNotFoundException ex) {
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Class<?> clz = Thread.currentThread().getContextClassLoader().loadClass(cname);
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manager = (LogManager) clz.newInstance();
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}
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}
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} catch (Exception ex) {
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System.err.println("Could not load Logmanager \"" + cname + "\"");
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ex.printStackTrace();
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}
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if (manager == null) {
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manager = new LogManager();
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}
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// Create and retain Logger for the root of the namespace.
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manager.rootLogger = manager.new RootLogger();
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manager.addLogger(manager.rootLogger);
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// Adding the global Logger. Doing so in the Logger.<clinit>
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// would deadlock with the LogManager.<clinit>.
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Logger.getGlobal().setLogManager(manager);
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manager.addLogger(Logger.getGlobal());
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// We don't call readConfiguration() here, as we may be running
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// very early in the JVM startup sequence. Instead readConfiguration
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// will be called lazily in getLogManager().
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return null;
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}
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});
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}
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// This private class is used as a shutdown hook.
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// It does a "reset" to close all open handlers.
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private class Cleaner extends Thread {
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private Cleaner() {
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/* Set context class loader to null in order to avoid
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* keeping a strong reference to an application classloader.
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*/
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this.setContextClassLoader(null);
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}
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public void run() {
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// This is to ensure the LogManager.<clinit> is completed
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// before synchronized block. Otherwise deadlocks are possible.
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LogManager mgr = manager;
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// If the global handlers haven't been initialized yet, we
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// don't want to initialize them just so we can close them!
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synchronized (LogManager.this) {
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// Note that death is imminent.
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deathImminent = true;
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initializedGlobalHandlers = true;
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}
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// Do a reset to close all active handlers.
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reset();
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}
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}
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/**
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* Protected constructor. This is protected so that container applications
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* (such as J2EE containers) can subclass the object. It is non-public as
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* it is intended that there only be one LogManager object, whose value is
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* retrieved by calling LogManager.getLogManager.
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*/
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protected LogManager() {
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// Add a shutdown hook to close the global handlers.
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try {
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Runtime.getRuntime().addShutdownHook(new Cleaner());
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} catch (IllegalStateException e) {
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// If the VM is already shutting down,
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// We do not need to register shutdownHook.
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}
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}
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/**
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* Return the global LogManager object.
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*/
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public static LogManager getLogManager() {
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if (manager != null) {
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manager.readPrimordialConfiguration();
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}
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return manager;
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}
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private void readPrimordialConfiguration() {
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if (!readPrimordialConfiguration) {
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synchronized (this) {
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if (!readPrimordialConfiguration) {
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// If System.in/out/err are null, it's a good
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// indication that we're still in the
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// bootstrapping phase
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if (System.out == null) {
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return;
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}
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readPrimordialConfiguration = true;
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try {
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AccessController.doPrivileged(new PrivilegedExceptionAction<Object>() {
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public Object run() throws Exception {
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readConfiguration();
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// Platform loggers begin to delegate to java.util.logging.Logger
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sun.util.logging.PlatformLogger.redirectPlatformLoggers();
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return null;
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}
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});
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} catch (Exception ex) {
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// System.err.println("Can't read logging configuration:");
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// ex.printStackTrace();
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}
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}
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}
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}
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}
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/**
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* Adds an event listener to be invoked when the logging
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* properties are re-read. Adding multiple instances of
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* the same event Listener results in multiple entries
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* in the property event listener table.
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*
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* @param l event listener
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* @exception SecurityException if a security manager exists and if
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* the caller does not have LoggingPermission("control").
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* @exception NullPointerException if the PropertyChangeListener is null.
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* @deprecated The dependency on {@code PropertyChangeListener} creates a
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* significant impediment to future modularization of the Java
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* platform. This method will be removed in a future release.
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* The global {@code LogManager} can detect changes to the
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* logging configuration by overridding the {@link
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* #readConfiguration readConfiguration} method.
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*/
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@Deprecated
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public void addPropertyChangeListener(PropertyChangeListener l) throws SecurityException {
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PropertyChangeListener listener = Objects.requireNonNull(l);
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checkPermission();
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synchronized (listenerMap) {
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// increment the registration count if already registered
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Integer value = listenerMap.get(listener);
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value = (value == null) ? 1 : (value + 1);
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listenerMap.put(listener, value);
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}
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}
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/**
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* Removes an event listener for property change events.
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* If the same listener instance has been added to the listener table
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* through multiple invocations of <CODE>addPropertyChangeListener</CODE>,
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* then an equivalent number of
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* <CODE>removePropertyChangeListener</CODE> invocations are required to remove
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* all instances of that listener from the listener table.
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* <P>
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* Returns silently if the given listener is not found.
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*
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* @param l event listener (can be null)
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* @exception SecurityException if a security manager exists and if
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* the caller does not have LoggingPermission("control").
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* @deprecated The dependency on {@code PropertyChangeListener} creates a
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* significant impediment to future modularization of the Java
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* platform. This method will be removed in a future release.
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* The global {@code LogManager} can detect changes to the
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* logging configuration by overridding the {@link
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* #readConfiguration readConfiguration} method.
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*/
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@Deprecated
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public void removePropertyChangeListener(PropertyChangeListener l) throws SecurityException {
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checkPermission();
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if (l != null) {
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PropertyChangeListener listener = l;
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synchronized (listenerMap) {
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Integer value = listenerMap.get(listener);
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if (value != null) {
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// remove from map if registration count is 1, otherwise
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// just decrement its count
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int i = value.intValue();
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if (i == 1) {
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listenerMap.remove(listener);
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} else {
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assert i > 1;
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listenerMap.put(listener, i - 1);
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}
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}
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}
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}
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}
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// Package-level method.
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// Find or create a specified logger instance. If a logger has
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// already been created with the given name it is returned.
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// Otherwise a new logger instance is created and registered
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// in the LogManager global namespace.
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// This method will always return a non-null Logger object.
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// Synchronization is not required here. All synchronization for
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// adding a new Logger object is handled by addLogger().
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Logger demandLogger(String name) {
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Logger result = getLogger(name);
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if (result == null) {
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// only allocate the new logger once
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Logger newLogger = new Logger(name, null);
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do {
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if (addLogger(newLogger)) {
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// We successfully added the new Logger that we
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// created above so return it without refetching.
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return newLogger;
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}
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// We didn't add the new Logger that we created above
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// because another thread added a Logger with the same
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// name after our null check above and before our call
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// to addLogger(). We have to refetch the Logger because
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// addLogger() returns a boolean instead of the Logger
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// reference itself. However, if the thread that created
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// the other Logger is not holding a strong reference to
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// the other Logger, then it is possible for the other
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// Logger to be GC'ed after we saw it in addLogger() and
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// before we can refetch it. If it has been GC'ed then
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// we'll just loop around and try again.
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result = getLogger(name);
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} while (result == null);
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}
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return result;
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}
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// If logger.getUseParentHandlers() returns 'true' and any of the logger's
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// parents have levels or handlers defined, make sure they are instantiated.
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private void processParentHandlers(Logger logger, String name) {
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int ix = 1;
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for (;;) {
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int ix2 = name.indexOf(".", ix);
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if (ix2 < 0) {
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break;
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}
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String pname = name.substring(0,ix2);
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if (getProperty(pname+".level") != null ||
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getProperty(pname+".handlers") != null) {
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// This pname has a level/handlers definition.
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// Make sure it exists.
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demandLogger(pname);
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}
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ix = ix2+1;
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}
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}
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// Add new per logger handlers.
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// We need to raise privilege here. All our decisions will
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// be made based on the logging configuration, which can
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// only be modified by trusted code.
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private void loadLoggerHandlers(final Logger logger, final String name,
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final String handlersPropertyName) {
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AccessController.doPrivileged(new PrivilegedAction<Object>() {
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public Object run() {
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if (logger != rootLogger) {
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boolean useParent = getBooleanProperty(name + ".useParentHandlers", true);
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if (!useParent) {
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logger.setUseParentHandlers(false);
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}
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}
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String names[] = parseClassNames(handlersPropertyName);
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for (int i = 0; i < names.length; i++) {
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String word = names[i];
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try {
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Class<?> clz = ClassLoader.getSystemClassLoader().loadClass(word);
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Handler hdl = (Handler) clz.newInstance();
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try {
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// Check if there is a property defining the
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// this handler's level.
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String levs = getProperty(word + ".level");
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if (levs != null) {
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hdl.setLevel(Level.parse(levs));
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}
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} catch (Exception ex) {
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System.err.println("Can't set level for " + word);
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// Probably a bad level. Drop through.
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}
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// Add this Handler to the logger
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logger.addHandler(hdl);
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} catch (Exception ex) {
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System.err.println("Can't load log handler \"" + word + "\"");
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System.err.println("" + ex);
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ex.printStackTrace();
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}
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}
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return null;
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}});
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}
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// loggerRefQueue holds LoggerWeakRef objects for Logger objects
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// that have been GC'ed.
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private final ReferenceQueue<Logger> loggerRefQueue
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= new ReferenceQueue<>();
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// Package-level inner class.
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// Helper class for managing WeakReferences to Logger objects.
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//
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// LogManager.namedLoggers
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// - has weak references to all named Loggers
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// - namedLoggers keeps the LoggerWeakRef objects for the named
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// Loggers around until we can deal with the book keeping for
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// the named Logger that is being GC'ed.
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// LogManager.LogNode.loggerRef
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// - has a weak reference to a named Logger
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// - the LogNode will also keep the LoggerWeakRef objects for
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// the named Loggers around; currently LogNodes never go away.
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// Logger.kids
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// - has a weak reference to each direct child Logger; this
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// includes anonymous and named Loggers
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// - anonymous Loggers are always children of the rootLogger
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// which is a strong reference; rootLogger.kids keeps the
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// LoggerWeakRef objects for the anonymous Loggers around
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// until we can deal with the book keeping.
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//
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final class LoggerWeakRef extends WeakReference<Logger> {
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private String name; // for namedLoggers cleanup
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private LogNode node; // for loggerRef cleanup
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private WeakReference<Logger> parentRef; // for kids cleanup
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LoggerWeakRef(Logger logger) {
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|
super(logger, loggerRefQueue);
|
|
|
|
name = logger.getName(); // save for namedLoggers cleanup
|
|
}
|
|
|
|
// dispose of this LoggerWeakRef object
|
|
void dispose() {
|
|
if (node != null) {
|
|
// if we have a LogNode, then we were a named Logger
|
|
// so clear namedLoggers weak ref to us
|
|
manager.namedLoggers.remove(name);
|
|
name = null; // clear our ref to the Logger's name
|
|
|
|
node.loggerRef = null; // clear LogNode's weak ref to us
|
|
node = null; // clear our ref to LogNode
|
|
}
|
|
|
|
if (parentRef != null) {
|
|
// this LoggerWeakRef has or had a parent Logger
|
|
Logger parent = parentRef.get();
|
|
if (parent != null) {
|
|
// the parent Logger is still there so clear the
|
|
// parent Logger's weak ref to us
|
|
parent.removeChildLogger(this);
|
|
}
|
|
parentRef = null; // clear our weak ref to the parent Logger
|
|
}
|
|
}
|
|
|
|
// set the node field to the specified value
|
|
void setNode(LogNode node) {
|
|
this.node = node;
|
|
}
|
|
|
|
// set the parentRef field to the specified value
|
|
void setParentRef(WeakReference<Logger> parentRef) {
|
|
this.parentRef = parentRef;
|
|
}
|
|
}
|
|
|
|
// Package-level method.
|
|
// Drain some Logger objects that have been GC'ed.
|
|
//
|
|
// drainLoggerRefQueueBounded() is called by addLogger() below
|
|
// and by Logger.getAnonymousLogger(String) so we'll drain up to
|
|
// MAX_ITERATIONS GC'ed Loggers for every Logger we add.
|
|
//
|
|
// On a WinXP VMware client, a MAX_ITERATIONS value of 400 gives
|
|
// us about a 50/50 mix in increased weak ref counts versus
|
|
// decreased weak ref counts in the AnonLoggerWeakRefLeak test.
|
|
// Here are stats for cleaning up sets of 400 anonymous Loggers:
|
|
// - test duration 1 minute
|
|
// - sample size of 125 sets of 400
|
|
// - average: 1.99 ms
|
|
// - minimum: 0.57 ms
|
|
// - maximum: 25.3 ms
|
|
//
|
|
// The same config gives us a better decreased weak ref count
|
|
// than increased weak ref count in the LoggerWeakRefLeak test.
|
|
// Here are stats for cleaning up sets of 400 named Loggers:
|
|
// - test duration 2 minutes
|
|
// - sample size of 506 sets of 400
|
|
// - average: 0.57 ms
|
|
// - minimum: 0.02 ms
|
|
// - maximum: 10.9 ms
|
|
//
|
|
private final static int MAX_ITERATIONS = 400;
|
|
final synchronized void drainLoggerRefQueueBounded() {
|
|
for (int i = 0; i < MAX_ITERATIONS; i++) {
|
|
if (loggerRefQueue == null) {
|
|
// haven't finished loading LogManager yet
|
|
break;
|
|
}
|
|
|
|
LoggerWeakRef ref = (LoggerWeakRef) loggerRefQueue.poll();
|
|
if (ref == null) {
|
|
break;
|
|
}
|
|
// a Logger object has been GC'ed so clean it up
|
|
ref.dispose();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Add a named logger. This does nothing and returns false if a logger
|
|
* with the same name is already registered.
|
|
* <p>
|
|
* The Logger factory methods call this method to register each
|
|
* newly created Logger.
|
|
* <p>
|
|
* The application should retain its own reference to the Logger
|
|
* object to avoid it being garbage collected. The LogManager
|
|
* may only retain a weak reference.
|
|
*
|
|
* @param logger the new logger.
|
|
* @return true if the argument logger was registered successfully,
|
|
* false if a logger of that name already exists.
|
|
* @exception NullPointerException if the logger name is null.
|
|
*/
|
|
public synchronized boolean addLogger(Logger logger) {
|
|
final String name = logger.getName();
|
|
if (name == null) {
|
|
throw new NullPointerException();
|
|
}
|
|
|
|
// cleanup some Loggers that have been GC'ed
|
|
drainLoggerRefQueueBounded();
|
|
|
|
LoggerWeakRef ref = namedLoggers.get(name);
|
|
if (ref != null) {
|
|
if (ref.get() == null) {
|
|
// It's possible that the Logger was GC'ed after the
|
|
// drainLoggerRefQueueBounded() call above so allow
|
|
// a new one to be registered.
|
|
namedLoggers.remove(name);
|
|
} else {
|
|
// We already have a registered logger with the given name.
|
|
return false;
|
|
}
|
|
}
|
|
|
|
// We're adding a new logger.
|
|
// Note that we are creating a weak reference here.
|
|
ref = new LoggerWeakRef(logger);
|
|
namedLoggers.put(name, ref);
|
|
|
|
// Apply any initial level defined for the new logger.
|
|
Level level = getLevelProperty(name+".level", null);
|
|
if (level != null) {
|
|
doSetLevel(logger, level);
|
|
}
|
|
|
|
// Do we have a per logger handler too?
|
|
// Note: this will add a 200ms penalty
|
|
loadLoggerHandlers(logger, name, name+".handlers");
|
|
processParentHandlers(logger, name);
|
|
|
|
// Find the new node and its parent.
|
|
LogNode node = findNode(name);
|
|
node.loggerRef = ref;
|
|
Logger parent = null;
|
|
LogNode nodep = node.parent;
|
|
while (nodep != null) {
|
|
LoggerWeakRef nodeRef = nodep.loggerRef;
|
|
if (nodeRef != null) {
|
|
parent = nodeRef.get();
|
|
if (parent != null) {
|
|
break;
|
|
}
|
|
}
|
|
nodep = nodep.parent;
|
|
}
|
|
|
|
if (parent != null) {
|
|
doSetParent(logger, parent);
|
|
}
|
|
// Walk over the children and tell them we are their new parent.
|
|
node.walkAndSetParent(logger);
|
|
|
|
// new LogNode is ready so tell the LoggerWeakRef about it
|
|
ref.setNode(node);
|
|
|
|
return true;
|
|
}
|
|
|
|
|
|
// Private method to set a level on a logger.
|
|
// If necessary, we raise privilege before doing the call.
|
|
private static void doSetLevel(final Logger logger, final Level level) {
|
|
SecurityManager sm = System.getSecurityManager();
|
|
if (sm == null) {
|
|
// There is no security manager, so things are easy.
|
|
logger.setLevel(level);
|
|
return;
|
|
}
|
|
// There is a security manager. Raise privilege before
|
|
// calling setLevel.
|
|
AccessController.doPrivileged(new PrivilegedAction<Object>() {
|
|
public Object run() {
|
|
logger.setLevel(level);
|
|
return null;
|
|
}});
|
|
}
|
|
|
|
|
|
|
|
// Private method to set a parent on a logger.
|
|
// If necessary, we raise privilege before doing the setParent call.
|
|
private static void doSetParent(final Logger logger, final Logger parent) {
|
|
SecurityManager sm = System.getSecurityManager();
|
|
if (sm == null) {
|
|
// There is no security manager, so things are easy.
|
|
logger.setParent(parent);
|
|
return;
|
|
}
|
|
// There is a security manager. Raise privilege before
|
|
// calling setParent.
|
|
AccessController.doPrivileged(new PrivilegedAction<Object>() {
|
|
public Object run() {
|
|
logger.setParent(parent);
|
|
return null;
|
|
}});
|
|
}
|
|
|
|
// Find a node in our tree of logger nodes.
|
|
// If necessary, create it.
|
|
private LogNode findNode(String name) {
|
|
if (name == null || name.equals("")) {
|
|
return root;
|
|
}
|
|
LogNode node = root;
|
|
while (name.length() > 0) {
|
|
int ix = name.indexOf(".");
|
|
String head;
|
|
if (ix > 0) {
|
|
head = name.substring(0,ix);
|
|
name = name.substring(ix+1);
|
|
} else {
|
|
head = name;
|
|
name = "";
|
|
}
|
|
if (node.children == null) {
|
|
node.children = new HashMap<>();
|
|
}
|
|
LogNode child = node.children.get(head);
|
|
if (child == null) {
|
|
child = new LogNode(node);
|
|
node.children.put(head, child);
|
|
}
|
|
node = child;
|
|
}
|
|
return node;
|
|
}
|
|
|
|
/**
|
|
* Method to find a named logger.
|
|
* <p>
|
|
* Note that since untrusted code may create loggers with
|
|
* arbitrary names this method should not be relied on to
|
|
* find Loggers for security sensitive logging.
|
|
* It is also important to note that the Logger associated with the
|
|
* String {@code name} may be garbage collected at any time if there
|
|
* is no strong reference to the Logger. The caller of this method
|
|
* must check the return value for null in order to properly handle
|
|
* the case where the Logger has been garbage collected.
|
|
* <p>
|
|
* @param name name of the logger
|
|
* @return matching logger or null if none is found
|
|
*/
|
|
public synchronized Logger getLogger(String name) {
|
|
LoggerWeakRef ref = namedLoggers.get(name);
|
|
if (ref == null) {
|
|
return null;
|
|
}
|
|
Logger logger = ref.get();
|
|
if (logger == null) {
|
|
// Hashtable holds stale weak reference
|
|
// to a logger which has been GC-ed.
|
|
namedLoggers.remove(name);
|
|
}
|
|
return logger;
|
|
}
|
|
|
|
/**
|
|
* Get an enumeration of known logger names.
|
|
* <p>
|
|
* Note: Loggers may be added dynamically as new classes are loaded.
|
|
* This method only reports on the loggers that are currently registered.
|
|
* It is also important to note that this method only returns the name
|
|
* of a Logger, not a strong reference to the Logger itself.
|
|
* The returned String does nothing to prevent the Logger from being
|
|
* garbage collected. In particular, if the returned name is passed
|
|
* to {@code LogManager.getLogger()}, then the caller must check the
|
|
* return value from {@code LogManager.getLogger()} for null to properly
|
|
* handle the case where the Logger has been garbage collected in the
|
|
* time since its name was returned by this method.
|
|
* <p>
|
|
* @return enumeration of logger name strings
|
|
*/
|
|
public synchronized Enumeration<String> getLoggerNames() {
|
|
return namedLoggers.keys();
|
|
}
|
|
|
|
/**
|
|
* Reinitialize the logging properties and reread the logging configuration.
|
|
* <p>
|
|
* The same rules are used for locating the configuration properties
|
|
* as are used at startup. So normally the logging properties will
|
|
* be re-read from the same file that was used at startup.
|
|
* <P>
|
|
* Any log level definitions in the new configuration file will be
|
|
* applied using Logger.setLevel(), if the target Logger exists.
|
|
* <p>
|
|
* A PropertyChangeEvent will be fired after the properties are read.
|
|
*
|
|
* @exception SecurityException if a security manager exists and if
|
|
* the caller does not have LoggingPermission("control").
|
|
* @exception IOException if there are IO problems reading the configuration.
|
|
*/
|
|
public void readConfiguration() throws IOException, SecurityException {
|
|
checkPermission();
|
|
|
|
// if a configuration class is specified, load it and use it.
|
|
String cname = System.getProperty("java.util.logging.config.class");
|
|
if (cname != null) {
|
|
try {
|
|
// Instantiate the named class. It is its constructor's
|
|
// responsibility to initialize the logging configuration, by
|
|
// calling readConfiguration(InputStream) with a suitable stream.
|
|
try {
|
|
Class<?> clz = ClassLoader.getSystemClassLoader().loadClass(cname);
|
|
clz.newInstance();
|
|
return;
|
|
} catch (ClassNotFoundException ex) {
|
|
Class<?> clz = Thread.currentThread().getContextClassLoader().loadClass(cname);
|
|
clz.newInstance();
|
|
return;
|
|
}
|
|
} catch (Exception ex) {
|
|
System.err.println("Logging configuration class \"" + cname + "\" failed");
|
|
System.err.println("" + ex);
|
|
// keep going and useful config file.
|
|
}
|
|
}
|
|
|
|
String fname = System.getProperty("java.util.logging.config.file");
|
|
if (fname == null) {
|
|
fname = System.getProperty("java.home");
|
|
if (fname == null) {
|
|
throw new Error("Can't find java.home ??");
|
|
}
|
|
File f = new File(fname, "lib");
|
|
f = new File(f, "logging.properties");
|
|
fname = f.getCanonicalPath();
|
|
}
|
|
InputStream in = new FileInputStream(fname);
|
|
BufferedInputStream bin = new BufferedInputStream(in);
|
|
try {
|
|
readConfiguration(bin);
|
|
} finally {
|
|
if (in != null) {
|
|
in.close();
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Reset the logging configuration.
|
|
* <p>
|
|
* For all named loggers, the reset operation removes and closes
|
|
* all Handlers and (except for the root logger) sets the level
|
|
* to null. The root logger's level is set to Level.INFO.
|
|
*
|
|
* @exception SecurityException if a security manager exists and if
|
|
* the caller does not have LoggingPermission("control").
|
|
*/
|
|
|
|
public void reset() throws SecurityException {
|
|
checkPermission();
|
|
synchronized (this) {
|
|
props = new Properties();
|
|
// Since we are doing a reset we no longer want to initialize
|
|
// the global handlers, if they haven't been initialized yet.
|
|
initializedGlobalHandlers = true;
|
|
}
|
|
Enumeration<String> enum_ = getLoggerNames();
|
|
while (enum_.hasMoreElements()) {
|
|
String name = enum_.nextElement();
|
|
resetLogger(name);
|
|
}
|
|
}
|
|
|
|
|
|
// Private method to reset an individual target logger.
|
|
private void resetLogger(String name) {
|
|
Logger logger = getLogger(name);
|
|
if (logger == null) {
|
|
return;
|
|
}
|
|
// Close all the Logger's handlers.
|
|
Handler[] targets = logger.getHandlers();
|
|
for (int i = 0; i < targets.length; i++) {
|
|
Handler h = targets[i];
|
|
logger.removeHandler(h);
|
|
try {
|
|
h.close();
|
|
} catch (Exception ex) {
|
|
// Problems closing a handler? Keep going...
|
|
}
|
|
}
|
|
if (name != null && name.equals("")) {
|
|
// This is the root logger.
|
|
logger.setLevel(defaultLevel);
|
|
} else {
|
|
logger.setLevel(null);
|
|
}
|
|
}
|
|
|
|
// get a list of whitespace separated classnames from a property.
|
|
private String[] parseClassNames(String propertyName) {
|
|
String hands = getProperty(propertyName);
|
|
if (hands == null) {
|
|
return new String[0];
|
|
}
|
|
hands = hands.trim();
|
|
int ix = 0;
|
|
Vector<String> result = new Vector<>();
|
|
while (ix < hands.length()) {
|
|
int end = ix;
|
|
while (end < hands.length()) {
|
|
if (Character.isWhitespace(hands.charAt(end))) {
|
|
break;
|
|
}
|
|
if (hands.charAt(end) == ',') {
|
|
break;
|
|
}
|
|
end++;
|
|
}
|
|
String word = hands.substring(ix, end);
|
|
ix = end+1;
|
|
word = word.trim();
|
|
if (word.length() == 0) {
|
|
continue;
|
|
}
|
|
result.add(word);
|
|
}
|
|
return result.toArray(new String[result.size()]);
|
|
}
|
|
|
|
/**
|
|
* Reinitialize the logging properties and reread the logging configuration
|
|
* from the given stream, which should be in java.util.Properties format.
|
|
* A PropertyChangeEvent will be fired after the properties are read.
|
|
* <p>
|
|
* Any log level definitions in the new configuration file will be
|
|
* applied using Logger.setLevel(), if the target Logger exists.
|
|
*
|
|
* @param ins stream to read properties from
|
|
* @exception SecurityException if a security manager exists and if
|
|
* the caller does not have LoggingPermission("control").
|
|
* @exception IOException if there are problems reading from the stream.
|
|
*/
|
|
public void readConfiguration(InputStream ins) throws IOException, SecurityException {
|
|
checkPermission();
|
|
reset();
|
|
|
|
// Load the properties
|
|
props.load(ins);
|
|
// Instantiate new configuration objects.
|
|
String names[] = parseClassNames("config");
|
|
|
|
for (int i = 0; i < names.length; i++) {
|
|
String word = names[i];
|
|
try {
|
|
Class<?> clz = ClassLoader.getSystemClassLoader().loadClass(word);
|
|
clz.newInstance();
|
|
} catch (Exception ex) {
|
|
System.err.println("Can't load config class \"" + word + "\"");
|
|
System.err.println("" + ex);
|
|
// ex.printStackTrace();
|
|
}
|
|
}
|
|
|
|
// Set levels on any pre-existing loggers, based on the new properties.
|
|
setLevelsOnExistingLoggers();
|
|
|
|
// Notify any interested parties that our properties have changed.
|
|
// We first take a copy of the listener map so that we aren't holding any
|
|
// locks when calling the listeners.
|
|
Map<Object,Integer> listeners = null;
|
|
synchronized (listenerMap) {
|
|
if (!listenerMap.isEmpty())
|
|
listeners = new HashMap<>(listenerMap);
|
|
}
|
|
if (listeners != null) {
|
|
assert Beans.isBeansPresent();
|
|
Object ev = Beans.newPropertyChangeEvent(LogManager.class, null, null, null);
|
|
for (Map.Entry<Object,Integer> entry : listeners.entrySet()) {
|
|
Object listener = entry.getKey();
|
|
int count = entry.getValue().intValue();
|
|
for (int i = 0; i < count; i++) {
|
|
Beans.invokePropertyChange(listener, ev);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
// Note that we need to reinitialize global handles when
|
|
// they are first referenced.
|
|
synchronized (this) {
|
|
initializedGlobalHandlers = false;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Get the value of a logging property.
|
|
* The method returns null if the property is not found.
|
|
* @param name property name
|
|
* @return property value
|
|
*/
|
|
public String getProperty(String name) {
|
|
return props.getProperty(name);
|
|
}
|
|
|
|
// Package private method to get a String property.
|
|
// If the property is not defined we return the given
|
|
// default value.
|
|
String getStringProperty(String name, String defaultValue) {
|
|
String val = getProperty(name);
|
|
if (val == null) {
|
|
return defaultValue;
|
|
}
|
|
return val.trim();
|
|
}
|
|
|
|
// Package private method to get an integer property.
|
|
// If the property is not defined or cannot be parsed
|
|
// we return the given default value.
|
|
int getIntProperty(String name, int defaultValue) {
|
|
String val = getProperty(name);
|
|
if (val == null) {
|
|
return defaultValue;
|
|
}
|
|
try {
|
|
return Integer.parseInt(val.trim());
|
|
} catch (Exception ex) {
|
|
return defaultValue;
|
|
}
|
|
}
|
|
|
|
// Package private method to get a boolean property.
|
|
// If the property is not defined or cannot be parsed
|
|
// we return the given default value.
|
|
boolean getBooleanProperty(String name, boolean defaultValue) {
|
|
String val = getProperty(name);
|
|
if (val == null) {
|
|
return defaultValue;
|
|
}
|
|
val = val.toLowerCase();
|
|
if (val.equals("true") || val.equals("1")) {
|
|
return true;
|
|
} else if (val.equals("false") || val.equals("0")) {
|
|
return false;
|
|
}
|
|
return defaultValue;
|
|
}
|
|
|
|
// Package private method to get a Level property.
|
|
// If the property is not defined or cannot be parsed
|
|
// we return the given default value.
|
|
Level getLevelProperty(String name, Level defaultValue) {
|
|
String val = getProperty(name);
|
|
if (val == null) {
|
|
return defaultValue;
|
|
}
|
|
try {
|
|
return Level.parse(val.trim());
|
|
} catch (Exception ex) {
|
|
return defaultValue;
|
|
}
|
|
}
|
|
|
|
// Package private method to get a filter property.
|
|
// We return an instance of the class named by the "name"
|
|
// property. If the property is not defined or has problems
|
|
// we return the defaultValue.
|
|
Filter getFilterProperty(String name, Filter defaultValue) {
|
|
String val = getProperty(name);
|
|
try {
|
|
if (val != null) {
|
|
Class<?> clz = ClassLoader.getSystemClassLoader().loadClass(val);
|
|
return (Filter) clz.newInstance();
|
|
}
|
|
} catch (Exception ex) {
|
|
// We got one of a variety of exceptions in creating the
|
|
// class or creating an instance.
|
|
// Drop through.
|
|
}
|
|
// We got an exception. Return the defaultValue.
|
|
return defaultValue;
|
|
}
|
|
|
|
|
|
// Package private method to get a formatter property.
|
|
// We return an instance of the class named by the "name"
|
|
// property. If the property is not defined or has problems
|
|
// we return the defaultValue.
|
|
Formatter getFormatterProperty(String name, Formatter defaultValue) {
|
|
String val = getProperty(name);
|
|
try {
|
|
if (val != null) {
|
|
Class<?> clz = ClassLoader.getSystemClassLoader().loadClass(val);
|
|
return (Formatter) clz.newInstance();
|
|
}
|
|
} catch (Exception ex) {
|
|
// We got one of a variety of exceptions in creating the
|
|
// class or creating an instance.
|
|
// Drop through.
|
|
}
|
|
// We got an exception. Return the defaultValue.
|
|
return defaultValue;
|
|
}
|
|
|
|
// Private method to load the global handlers.
|
|
// We do the real work lazily, when the global handlers
|
|
// are first used.
|
|
private synchronized void initializeGlobalHandlers() {
|
|
if (initializedGlobalHandlers) {
|
|
return;
|
|
}
|
|
|
|
initializedGlobalHandlers = true;
|
|
|
|
if (deathImminent) {
|
|
// Aaargh...
|
|
// The VM is shutting down and our exit hook has been called.
|
|
// Avoid allocating global handlers.
|
|
return;
|
|
}
|
|
loadLoggerHandlers(rootLogger, null, "handlers");
|
|
}
|
|
|
|
private final Permission controlPermission = new LoggingPermission("control", null);
|
|
|
|
void checkPermission() {
|
|
SecurityManager sm = System.getSecurityManager();
|
|
if (sm != null)
|
|
sm.checkPermission(controlPermission);
|
|
}
|
|
|
|
/**
|
|
* Check that the current context is trusted to modify the logging
|
|
* configuration. This requires LoggingPermission("control").
|
|
* <p>
|
|
* If the check fails we throw a SecurityException, otherwise
|
|
* we return normally.
|
|
*
|
|
* @exception SecurityException if a security manager exists and if
|
|
* the caller does not have LoggingPermission("control").
|
|
*/
|
|
public void checkAccess() throws SecurityException {
|
|
checkPermission();
|
|
}
|
|
|
|
// Nested class to represent a node in our tree of named loggers.
|
|
private static class LogNode {
|
|
HashMap<String,LogNode> children;
|
|
LoggerWeakRef loggerRef;
|
|
LogNode parent;
|
|
|
|
LogNode(LogNode parent) {
|
|
this.parent = parent;
|
|
}
|
|
|
|
// Recursive method to walk the tree below a node and set
|
|
// a new parent logger.
|
|
void walkAndSetParent(Logger parent) {
|
|
if (children == null) {
|
|
return;
|
|
}
|
|
Iterator<LogNode> values = children.values().iterator();
|
|
while (values.hasNext()) {
|
|
LogNode node = values.next();
|
|
LoggerWeakRef ref = node.loggerRef;
|
|
Logger logger = (ref == null) ? null : ref.get();
|
|
if (logger == null) {
|
|
node.walkAndSetParent(parent);
|
|
} else {
|
|
doSetParent(logger, parent);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// We use a subclass of Logger for the root logger, so
|
|
// that we only instantiate the global handlers when they
|
|
// are first needed.
|
|
private class RootLogger extends Logger {
|
|
|
|
private RootLogger() {
|
|
super("", null);
|
|
setLevel(defaultLevel);
|
|
}
|
|
|
|
public void log(LogRecord record) {
|
|
// Make sure that the global handlers have been instantiated.
|
|
initializeGlobalHandlers();
|
|
super.log(record);
|
|
}
|
|
|
|
public void addHandler(Handler h) {
|
|
initializeGlobalHandlers();
|
|
super.addHandler(h);
|
|
}
|
|
|
|
public void removeHandler(Handler h) {
|
|
initializeGlobalHandlers();
|
|
super.removeHandler(h);
|
|
}
|
|
|
|
public Handler[] getHandlers() {
|
|
initializeGlobalHandlers();
|
|
return super.getHandlers();
|
|
}
|
|
}
|
|
|
|
|
|
// Private method to be called when the configuration has
|
|
// changed to apply any level settings to any pre-existing loggers.
|
|
synchronized private void setLevelsOnExistingLoggers() {
|
|
Enumeration<?> enum_ = props.propertyNames();
|
|
while (enum_.hasMoreElements()) {
|
|
String key = (String)enum_.nextElement();
|
|
if (!key.endsWith(".level")) {
|
|
// Not a level definition.
|
|
continue;
|
|
}
|
|
int ix = key.length() - 6;
|
|
String name = key.substring(0, ix);
|
|
Level level = getLevelProperty(key, null);
|
|
if (level == null) {
|
|
System.err.println("Bad level value for property: " + key);
|
|
continue;
|
|
}
|
|
Logger l = getLogger(name);
|
|
if (l == null) {
|
|
continue;
|
|
}
|
|
l.setLevel(level);
|
|
}
|
|
}
|
|
|
|
// Management Support
|
|
private static LoggingMXBean loggingMXBean = null;
|
|
/**
|
|
* String representation of the
|
|
* {@link javax.management.ObjectName} for the management interface
|
|
* for the logging facility.
|
|
*
|
|
* @see java.lang.management.PlatformLoggingMXBean
|
|
* @see java.util.logging.LoggingMXBean
|
|
*
|
|
* @since 1.5
|
|
*/
|
|
public final static String LOGGING_MXBEAN_NAME
|
|
= "java.util.logging:type=Logging";
|
|
|
|
/**
|
|
* Returns <tt>LoggingMXBean</tt> for managing loggers.
|
|
* An alternative way to manage loggers is through the
|
|
* {@link java.lang.management.PlatformLoggingMXBean} interface
|
|
* that can be obtained by calling:
|
|
* <pre>
|
|
* PlatformLoggingMXBean logging = {@link java.lang.management.ManagementFactory#getPlatformMXBean(Class)
|
|
* ManagementFactory.getPlatformMXBean}(PlatformLoggingMXBean.class);
|
|
* </pre>
|
|
*
|
|
* @return a {@link LoggingMXBean} object.
|
|
*
|
|
* @see java.lang.management.PlatformLoggingMXBean
|
|
* @since 1.5
|
|
*/
|
|
public static synchronized LoggingMXBean getLoggingMXBean() {
|
|
if (loggingMXBean == null) {
|
|
loggingMXBean = new Logging();
|
|
}
|
|
return loggingMXBean;
|
|
}
|
|
|
|
/**
|
|
* A class that provides access to the java.beans.PropertyChangeListener
|
|
* and java.beans.PropertyChangeEvent without creating a static dependency
|
|
* on java.beans. This class can be removed once the addPropertyChangeListener
|
|
* and removePropertyChangeListener methods are removed.
|
|
*/
|
|
private static class Beans {
|
|
private static final Class<?> propertyChangeListenerClass =
|
|
getClass("java.beans.PropertyChangeListener");
|
|
|
|
private static final Class<?> propertyChangeEventClass =
|
|
getClass("java.beans.PropertyChangeEvent");
|
|
|
|
private static final Method propertyChangeMethod =
|
|
getMethod(propertyChangeListenerClass,
|
|
"propertyChange",
|
|
propertyChangeEventClass);
|
|
|
|
private static final Constructor<?> propertyEventCtor =
|
|
getConstructor(propertyChangeEventClass,
|
|
Object.class,
|
|
String.class,
|
|
Object.class,
|
|
Object.class);
|
|
|
|
private static Class<?> getClass(String name) {
|
|
try {
|
|
return Class.forName(name, true, Beans.class.getClassLoader());
|
|
} catch (ClassNotFoundException e) {
|
|
return null;
|
|
}
|
|
}
|
|
private static Constructor<?> getConstructor(Class<?> c, Class<?>... types) {
|
|
try {
|
|
return (c == null) ? null : c.getDeclaredConstructor(types);
|
|
} catch (NoSuchMethodException x) {
|
|
throw new AssertionError(x);
|
|
}
|
|
}
|
|
|
|
private static Method getMethod(Class<?> c, String name, Class<?>... types) {
|
|
try {
|
|
return (c == null) ? null : c.getMethod(name, types);
|
|
} catch (NoSuchMethodException e) {
|
|
throw new AssertionError(e);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Returns {@code true} if java.beans is present.
|
|
*/
|
|
static boolean isBeansPresent() {
|
|
return propertyChangeListenerClass != null &&
|
|
propertyChangeEventClass != null;
|
|
}
|
|
|
|
/**
|
|
* Returns a new PropertyChangeEvent with the given source, property
|
|
* name, old and new values.
|
|
*/
|
|
static Object newPropertyChangeEvent(Object source, String prop,
|
|
Object oldValue, Object newValue)
|
|
{
|
|
try {
|
|
return propertyEventCtor.newInstance(source, prop, oldValue, newValue);
|
|
} catch (InstantiationException | IllegalAccessException x) {
|
|
throw new AssertionError(x);
|
|
} catch (InvocationTargetException x) {
|
|
Throwable cause = x.getCause();
|
|
if (cause instanceof Error)
|
|
throw (Error)cause;
|
|
if (cause instanceof RuntimeException)
|
|
throw (RuntimeException)cause;
|
|
throw new AssertionError(x);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Invokes the given PropertyChangeListener's propertyChange method
|
|
* with the given event.
|
|
*/
|
|
static void invokePropertyChange(Object listener, Object ev) {
|
|
try {
|
|
propertyChangeMethod.invoke(listener, ev);
|
|
} catch (IllegalAccessException x) {
|
|
throw new AssertionError(x);
|
|
} catch (InvocationTargetException x) {
|
|
Throwable cause = x.getCause();
|
|
if (cause instanceof Error)
|
|
throw (Error)cause;
|
|
if (cause instanceof RuntimeException)
|
|
throw (RuntimeException)cause;
|
|
throw new AssertionError(x);
|
|
}
|
|
}
|
|
}
|
|
}
|