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jMonkeyEngine is a 3-D game engine for adventurous Java developers
/*
* Copyright (c) 2009-2021 jMonkeyEngine
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* * Neither the name of 'jMonkeyEngine' nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.jme3.asset;
import com.jme3.asset.cache.AssetCache;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* ImplHandler manages the asset loader and asset locator
* implementations in a thread safe way. This allows implementations
* which store local persistent data to operate with a multi-threaded system.
* This is done by keeping an instance of each asset loader and asset
* locator object in a thread local.
*/
final class ImplHandler {
private static final Logger logger = Logger.getLogger(ImplHandler.class.getName());
private final AssetManager assetManager;
private final ThreadLocal parentAssetKey
= new ThreadLocal<>();
private final CopyOnWriteArrayList> locatorsList =
new CopyOnWriteArrayList<>();
private final HashMap, ImplThreadLocal> classToLoaderMap =
new HashMap<>();
private final ConcurrentHashMap> extensionToLoaderMap =
new ConcurrentHashMap<>();
private final ConcurrentHashMap, AssetProcessor> classToProcMap =
new ConcurrentHashMap<>();
private final ConcurrentHashMap, AssetCache> classToCacheMap =
new ConcurrentHashMap<>();
public ImplHandler(AssetManager assetManager) {
this.assetManager = assetManager;
}
protected static class ImplThreadLocal extends ThreadLocal {
private final Class type;
private final String path;
private final String[] extensions;
public ImplThreadLocal(Class type, String[] extensions) {
this.type = type;
this.extensions = extensions.clone();
this.path = null;
}
public ImplThreadLocal(Class type, String path) {
this.type = type;
this.path = path;
this.extensions = null;
}
public ImplThreadLocal(Class type) {
this.type = type;
this.path = null;
this.extensions = null;
}
public String getPath() {
return path;
}
public String[] getExtensions() {
return extensions;
}
public Class getTypeClass() {
return type;
}
@Override
protected T initialValue() {
try {
T obj = type.newInstance();
if (path != null) {
((AssetLocator) obj).setRootPath(path);
}
return obj;
} catch (InstantiationException | IllegalAccessException ex) {
logger.log(Level.SEVERE, "Cannot create locator of type {0}, does"
+ " the class have an empty and publicly accessible"
+ " constructor?", type.getName());
logger.throwing(type.getName(), "", ex);
}
return null;
}
}
/**
* Establishes the asset key that is used for tracking dependent assets
* that have failed to load. When set, the {@link DesktopAssetManager}
* gets a hint that it should suppress {@link AssetNotFoundException}s
* and instead call the listener callback (if set).
*
* @param parentKey The parent key
*/
public void establishParentKey(AssetKey parentKey) {
if (parentAssetKey.get() == null) {
parentAssetKey.set(parentKey);
}
}
public void releaseParentKey(AssetKey parentKey) {
if (parentAssetKey.get() == parentKey) {
parentAssetKey.set(null);
}
}
public AssetKey getParentKey() {
return parentAssetKey.get();
}
/**
* Attempts to locate the given resource name.
* @param key The full name of the resource.
* @return The AssetInfo containing resource information required for
* access, or null if not found.
*/
public AssetInfo tryLocate(AssetKey key) {
if (locatorsList.isEmpty()) {
logger.warning("There are no locators currently"
+ " registered. Use AssetManager."
+ "registerLocator() to register a"
+ " locator.");
return null;
}
for (ImplThreadLocal local : locatorsList) {
AssetInfo info = local.get().locate(assetManager, key);
if (info != null) {
return info;
}
}
return null;
}
public int getLocatorCount() {
return locatorsList.size();
}
/**
* Returns the AssetLoader registered for the given extension
* of the current thread.
* @return AssetLoader registered with addLoader.
*/
public AssetLoader aquireLoader(AssetKey key) {
// No need to synchronize() against map, its concurrent
ImplThreadLocal local = extensionToLoaderMap.get(key.getExtension());
if (local == null) {
throw new AssetLoadException("No loader registered for type \""
+ key.getExtension() + "\"");
}
return (AssetLoader) local.get();
}
public void clearCache() {
// The iterator over the values collection is thread-safe.
synchronized (classToCacheMap) {
for (AssetCache cache : classToCacheMap.values()) {
cache.clearCache();
}
}
}
@SuppressWarnings("unchecked")
public T getCache(Class cacheClass) {
if (cacheClass == null) {
return null;
}
T cache = (T) classToCacheMap.get(cacheClass);
if (cache == null) {
synchronized (classToCacheMap) {
cache = (T) classToCacheMap.get(cacheClass);
if (cache == null) {
try {
cache = cacheClass.newInstance();
classToCacheMap.put(cacheClass, cache);
} catch (InstantiationException ex) {
throw new IllegalArgumentException("The cache class cannot"
+ " be created, ensure it has empty constructor", ex);
} catch (IllegalAccessException ex) {
throw new IllegalArgumentException("The cache class cannot "
+ "be accessed", ex);
}
}
}
}
return cache;
}
@SuppressWarnings("unchecked")
public T getProcessor(Class procClass) {
if (procClass == null)
return null;
T proc = (T) classToProcMap.get(procClass);
if (proc == null) {
synchronized (classToProcMap) {
proc = (T) classToProcMap.get(procClass);
if (proc == null) {
try {
proc = procClass.newInstance();
classToProcMap.put(procClass, proc);
} catch (InstantiationException ex) {
throw new IllegalArgumentException("The processor class cannot"
+ " be created, ensure it has empty constructor", ex);
} catch (IllegalAccessException ex) {
throw new IllegalArgumentException("The processor class cannot "
+ "be accessed", ex);
}
}
}
}
return proc;
}
@SuppressWarnings("unchecked")
public void addLoader(final Class loaderType, String ... extensions) {
// Synchronized access must be used for any ops on classToLoaderMap
ImplThreadLocal local = new ImplThreadLocal(loaderType, extensions);
for (String extension : extensions) {
extension = extension.toLowerCase();
synchronized (classToLoaderMap) {
classToLoaderMap.put(loaderType, local);
extensionToLoaderMap.put(extension, local);
}
}
}
public void removeLoader(final Class loaderType) {
// Synchronized access must be used for any ops on classToLoaderMap
// Find the loader ImplThreadLocal for this class
synchronized (classToLoaderMap) {
// Remove it from the class->loader map
ImplThreadLocal local = classToLoaderMap.remove(loaderType);
if (local == null)
return;
// Remove it from the extension->loader map
for (String extension : local.getExtensions()) {
extensionToLoaderMap.remove(extension);
}
}
}
@SuppressWarnings("unchecked")
public void addLocator(final Class locatorType, String rootPath) {
locatorsList.add(new ImplThreadLocal(locatorType, rootPath));
}
public void removeLocator(final Class locatorType, String rootPath) {
ArrayList> locatorsToRemove = new ArrayList<>();
Iterator> it = locatorsList.iterator();
while (it.hasNext()) {
ImplThreadLocal locator = it.next();
if (locator.getPath().equals(rootPath)
&& locator.getTypeClass().equals(locatorType)) {
//it.remove();
// copy on write list doesn't support iterator remove,
// must use temporary list
locatorsToRemove.add(locator);
}
}
locatorsList.removeAll(locatorsToRemove);
}
}
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