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/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

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

import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.lang.ref.ReferenceQueue;
import java.lang.ref.SoftReference;
import java.net.URI;
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 1.3 2011/04/07 20:26:12 hannes%helma.at Exp $
 */
public class SoftCachingModuleScriptProvider extends CachingModuleScriptProviderBase
{
    private static final long serialVersionUID = 1L;

    private transient ReferenceQueue