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GlobalScope is removed as its introduction had to serious consequence…
…s with compatibility and usage. Instead a special purpose class ClassCache is introduces to hold various caches. The class binds itself to an arbitrary object by using new SciptableObject.associateValue method so arbitrary ScriptableObject can be used as a scope without performance penalties.
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| /* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ | ||
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| /* ***** BEGIN LICENSE BLOCK ***** | ||
| * Version: MPL 1.1/GPL 2.0/LGPL 2.1 | ||
| * | ||
| * The contents of this file are subject to the Mozilla Public License Version | ||
| * 1.1 (the "License"); you may not use this file except in compliance with | ||
| * the License. You may obtain a copy of the License at | ||
| * http://www.mozilla.org/MPL/ | ||
| * | ||
| * Software distributed under the License is distributed on an "AS IS" basis, | ||
| * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License | ||
| * for the specific language governing rights and limitations under the | ||
| * License. | ||
| * | ||
| * The Original Code is cache holder of generated code for Java reflection | ||
| * | ||
| * The Initial Developer of the Original Code is | ||
| * RUnit Software AS. | ||
| * Portions created by the Initial Developer are Copyright (C) 2003 | ||
| * the Initial Developer. All Rights Reserved. | ||
| * | ||
| * Contributor(s): Igor Bukanov, igor@fastmail.fm | ||
| * | ||
| * Alternatively, the contents of this file may be used under the terms of | ||
| * either the GNU General Public License Version 2 or later (the "GPL"), or | ||
| * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), | ||
| * in which case the provisions of the GPL or the LGPL are applicable instead | ||
| * of those above. If you wish to allow use of your version of this file only | ||
| * under the terms of either the GPL or the LGPL, and not to allow others to | ||
| * use your version of this file under the terms of the MPL, indicate your | ||
| * decision by deleting the provisions above and replace them with the notice | ||
| * and other provisions required by the GPL or the LGPL. If you do not delete | ||
| * the provisions above, a recipient may use your version of this file under | ||
| * the terms of any one of the MPL, the GPL or the LGPL. | ||
| * | ||
| * ***** END LICENSE BLOCK ***** */ | ||
|
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| package org.mozilla.javascript; | ||
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| import java.io.*; | ||
| import java.util.Hashtable; | ||
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| /** | ||
| * Cache of generated classes and data structures to access Java runtime | ||
| * from JavaScript. | ||
| * | ||
| * @author Igor Bukanov | ||
| * | ||
| * @since Rhino 1.5 Release 5 | ||
| */ | ||
| public class ClassCache | ||
| { | ||
| private static final Object AKEY = new Object(); | ||
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| private volatile boolean cachingIsEnabled = true; | ||
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| Hashtable classTable = new Hashtable(); | ||
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| boolean invokerOptimization = true; | ||
| Invoker invokerMaster; | ||
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| Hashtable javaAdapterGeneratedClasses = new Hashtable(); | ||
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| Hashtable javaAdapterIFGlueMasters = new Hashtable(); | ||
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| private int generatedClassSerial; | ||
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| /** | ||
| * Search for ClassCache object in the given scope. | ||
| * The method first calls | ||
| * {@link ScriptableObject.getTopLevelScope(Scriptable scope)} | ||
| * to get the top most scope and then tries to locate associated | ||
| * ClassCache object in the prototype chain of the top scope. | ||
| * | ||
| * @param scope scope to search for ClassCache object. | ||
| * @return previously associated ClassCache object or a new instance of | ||
| * ClassCache if no ClassCache object was found. | ||
| * | ||
| * @see #associate(ScriptableObject topScope) | ||
| */ | ||
| public static ClassCache get(Scriptable scope) | ||
| { | ||
| scope = ScriptableObject.getTopLevelScope(scope); | ||
| Scriptable obj = scope; | ||
| do { | ||
| if (obj instanceof ScriptableObject) { | ||
| ScriptableObject so = (ScriptableObject)obj; | ||
| ClassCache lc = (ClassCache)so.getAssociatedValue(AKEY); | ||
| if (lc != null) { | ||
| return lc; | ||
| } | ||
| } | ||
| obj = obj.getPrototype(); | ||
| } while (obj != null); | ||
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| // ALERT: warn somehow about wrong cache usage ? | ||
| return new ClassCache(); | ||
| } | ||
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| /** | ||
| * Associate ClassCache object with the given top-level scope. | ||
| * The ClassCache object can only be associated with the given scope once. | ||
| * | ||
| * @param topScope scope to associate this ClassCache object with. | ||
| * @return true if no prevous ClassCache objects were embedded into | ||
| * the scope and this ClassCache were successfully associated | ||
| * or false otherwise. | ||
| * | ||
| * @see #get(Scriptable scope) | ||
| */ | ||
| public boolean associate(ScriptableObject topScope) | ||
| { | ||
| if (topScope.getParentScope() != null) { | ||
| // Can only associate cache with top level scope | ||
| throw new IllegalArgumentException(); | ||
| } | ||
| return this != topScope.associateValue(AKEY, this); | ||
| } | ||
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| /** | ||
| * Empty caches of generated Java classes and Java reflection information. | ||
| */ | ||
| public synchronized void clearCaches() | ||
| { | ||
| classTable = new Hashtable(); | ||
| javaAdapterGeneratedClasses = new Hashtable(); | ||
| javaAdapterIFGlueMasters = new Hashtable(); | ||
| Invoker im = invokerMaster; | ||
| if (im != null) { | ||
| im.clearMasterCaches(); | ||
| } | ||
| } | ||
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| /** | ||
| * Check if generated Java classes and Java reflection information | ||
| * is cached. | ||
| */ | ||
| public final boolean isCachingEnabled() | ||
| { | ||
| return cachingIsEnabled; | ||
| } | ||
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| /** | ||
| * Set whether to cache some values. | ||
| * <p> | ||
| * By default, the engine will cache generated classes and | ||
| * results of <tt>Class.getMethods()</tt> and similar calls. | ||
| * This can speed execution dramatically, but increases the memory | ||
| * footprint. Also, with caching enabled, references may be held to | ||
| * objects past the lifetime of any real usage. | ||
| * <p> | ||
| * If caching is enabled and this method is called with a | ||
| * <code>false</code> argument, the caches will be emptied. | ||
| * <p> | ||
| * Caching is enabled by default. | ||
| * | ||
| * @param cachingEnabled if true, caching is enabled | ||
| * | ||
| * @see #clearCaches() | ||
| */ | ||
| public synchronized void setCachingEnabled(boolean enabled) | ||
| { | ||
| if (enabled == cachingIsEnabled) | ||
| return; | ||
| if (!enabled) | ||
| clearCaches(); | ||
| cachingIsEnabled = enabled; | ||
| } | ||
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| /** | ||
| * To optimize invocation of reflected Java methods, the engine generates | ||
| * special glue classes that will call the methods directly. By default | ||
| * the optimization is enabled since it allows to speedup method invocation | ||
| * compared with calling <tt>Method.invoke</tt> by factor 2-2.5 under JDK | ||
| * 1.4.2 and by factor 10-15 under JDK 1.3.1. If increase memory | ||
| * consumption is too high or the optimization brings no benefits in a | ||
| * particular VM, then the optimization can be disabled. | ||
| * | ||
| * @param enabled if true, invoke optimization is enabled. | ||
| */ | ||
| public synchronized void setInvokerOptimizationEnabled(boolean enabled) | ||
| { | ||
| if (invokerOptimization == enabled) | ||
| return; | ||
| if (!enabled) | ||
| invokerMaster = null; | ||
| invokerOptimization = enabled; | ||
| } | ||
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| /** | ||
| * Internal engine method to return serial number for generated classes | ||
| * to ensure name uniqueness. | ||
| */ | ||
| public final synchronized int newClassSerialNumber() | ||
| { | ||
| return ++generatedClassSerial; | ||
| } | ||
| } |
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