org.mozilla.javascript.commonjs.module.provider.SoftCachingModuleScriptProvider Maven / Gradle / Ivy

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A version of the Rhino Javascript engine pulled diretly from the Mozialla repos.

The newest version!

package org.mozilla.javascript.commonjs.module.provider;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.lang.ref.ReferenceQueue;
import java.lang.ref.SoftReference;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;

import org.mozilla.javascript.Context;
import org.mozilla.javascript.Script;
import org.mozilla.javascript.Scriptable;
import org.mozilla.javascript.commonjs.module.ModuleScript;

/**
 * A module script provider that uses a module source provider to load modules
 * and caches the loaded modules. It softly references the loaded modules' 
 * Rhino {@link Script} objects, thus a module once loaded can become eligible
 * for garbage collection if it is otherwise unused under memory pressure.
 * Instances of this class are thread safe. 
 * @author Attila Szegedi
 * @version $Id: SoftCachingModuleScriptProvider.java,v 1.1 2010/02/15 19:31:12 szegedia%freemail.hu Exp $
 */
public class SoftCachingModuleScriptProvider extends CachingModuleScriptProviderBase 
{
    private static final long serialVersionUID = 1L;

    private transient ReferenceQueue