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8026163: Enhance media provisioning
Reviewed-by: art, skoivu
This commit is contained in:
Sergey Bylokhov
parent
8db4bc1298
commit
b6a92df609
@ -25,27 +25,33 @@
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package com.sun.media.sound;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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import java.util.Properties;
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import javax.sound.midi.Receiver;
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import javax.sound.midi.Sequencer;
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import javax.sound.midi.Synthesizer;
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import javax.sound.midi.Transmitter;
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import javax.sound.midi.spi.MidiDeviceProvider;
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import javax.sound.midi.spi.MidiFileReader;
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import javax.sound.midi.spi.MidiFileWriter;
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import javax.sound.midi.spi.SoundbankReader;
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import javax.sound.sampled.Clip;
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import javax.sound.sampled.Port;
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import javax.sound.sampled.SourceDataLine;
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import javax.sound.sampled.TargetDataLine;
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import javax.sound.sampled.spi.AudioFileReader;
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import javax.sound.sampled.spi.AudioFileWriter;
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import javax.sound.sampled.spi.FormatConversionProvider;
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import javax.sound.sampled.spi.MixerProvider;
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/**
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* JDK13Services uses the Service class in JDK 1.3
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* to discover a list of service providers installed
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* in the system.
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*
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* JDK13Services uses the Service class in JDK 1.3 to discover a list of service
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* providers installed in the system.
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* <p>
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* This class is public because it is called from javax.sound.midi.MidiSystem
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* and javax.sound.sampled.AudioSystem. The alternative would be to make
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* JSSecurityManager public, which is considered worse.
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@ -54,80 +60,55 @@ import javax.sound.sampled.TargetDataLine;
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*/
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public final class JDK13Services {
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/** The default for the length of the period to hold the cache.
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This value is given in milliseconds. It is equivalent to
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1 minute.
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*/
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private static final long DEFAULT_CACHING_PERIOD = 60000;
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/** Filename of the properties file for default provider properties.
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This file is searched in the subdirectory "lib" of the JRE directory
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(this behaviour is hardcoded).
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*/
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/**
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* Filename of the properties file for default provider properties. This
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* file is searched in the subdirectory "lib" of the JRE directory (this
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* behaviour is hardcoded).
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*/
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private static final String PROPERTIES_FILENAME = "sound.properties";
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/** Cache for the providers.
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Class objects of the provider type (MixerProvider, MidiDeviceProvider
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...) are used as keys. The values are instances of ProviderCache.
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*/
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private static final Map providersCacheMap = new HashMap();
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/** The length of the period to hold the cache.
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This value is given in milliseconds.
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*/
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private static long cachingPeriod = DEFAULT_CACHING_PERIOD;
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/** Properties loaded from the properties file for default provider
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properties.
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*/
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/**
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* Properties loaded from the properties file for default provider
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* properties.
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*/
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private static Properties properties;
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/** Private, no-args constructor to ensure against instantiation.
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/**
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* Private, no-args constructor to ensure against instantiation.
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*/
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private JDK13Services() {
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}
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/** Set the period provider lists are cached.
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This method is only intended for testing.
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/**
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* Obtains a List containing installed instances of the providers for the
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* requested service. The returned List is immutable.
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*
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* @param serviceClass The type of providers requested. This should be one
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* of AudioFileReader.class, AudioFileWriter.class,
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* FormatConversionProvider.class, MixerProvider.class,
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* MidiDeviceProvider.class, MidiFileReader.class,
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* MidiFileWriter.class or SoundbankReader.class.
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*
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* @return A List of providers of the requested type. This List is
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* immutable.
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*/
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public static void setCachingPeriod(int seconds) {
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cachingPeriod = seconds * 1000L;
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}
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/** Obtains a List containing installed instances of the
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providers for the requested service.
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The List of providers is cached for the period of time given by
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{@link #cachingPeriod cachingPeriod}. During this period, the same
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List instance is returned for the same type of provider. After this
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period, a new instance is constructed and returned. The returned
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List is immutable.
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@param serviceClass The type of providers requested. This should be one
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of AudioFileReader.class, AudioFileWriter.class,
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FormatConversionProvider.class, MixerProvider.class,
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MidiDeviceProvider.class, MidiFileReader.class, MidiFileWriter.class or
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SoundbankReader.class.
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@return A List of providers of the requested type. This List is
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immutable.
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*/
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public static synchronized List getProviders(Class serviceClass) {
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ProviderCache cache = (ProviderCache) providersCacheMap.get(serviceClass);
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if (cache == null) {
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cache = new ProviderCache();
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providersCacheMap.put(serviceClass, cache);
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public static List<?> getProviders(final Class<?> serviceClass) {
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final List<?> providers;
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if (!MixerProvider.class.equals(serviceClass)
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&& !FormatConversionProvider.class.equals(serviceClass)
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&& !AudioFileReader.class.equals(serviceClass)
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&& !AudioFileWriter.class.equals(serviceClass)
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&& !MidiDeviceProvider.class.equals(serviceClass)
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&& !SoundbankReader.class.equals(serviceClass)
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&& !MidiFileWriter.class.equals(serviceClass)
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&& !MidiFileReader.class.equals(serviceClass)) {
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providers = new ArrayList<>(0);
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} else {
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providers = JSSecurityManager.getProviders(serviceClass);
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}
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if (cache.providers == null ||
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System.currentTimeMillis() > cache.lastUpdate + cachingPeriod) {
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cache.providers = Collections.unmodifiableList(JSSecurityManager.getProviders(serviceClass));
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cache.lastUpdate = System.currentTimeMillis();
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}
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return cache.providers;
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return Collections.unmodifiableList(providers);
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}
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/** Obtain the provider class name part of a default provider property.
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@param typeClass The type of the default provider property. This
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should be one of Receiver.class, Transmitter.class, Sequencer.class,
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@ -219,14 +200,4 @@ public final class JDK13Services {
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}
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return properties;
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}
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// INNER CLASSES
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private static class ProviderCache {
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// System time of the last update in milliseconds.
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public long lastUpdate;
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// The providers.
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public List providers;
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}
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}
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@ -185,8 +185,8 @@ final class JSSecurityManager {
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return thread;
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}
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static <T> List<T> getProviders(final Class<T> providerClass) {
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List<T> p = new ArrayList<>();
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static synchronized <T> List<T> getProviders(final Class<T> providerClass) {
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List<T> p = new ArrayList<>(7);
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// ServiceLoader creates "lazy" iterator instance, but it ensures that
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// next/hasNext run with permissions that are restricted by whatever
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// creates the ServiceLoader instance, so it requires to be called from
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