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/* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* 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/. */
// API class
package org.mozilla.javascript;
/**
* This class provides support for implementing Java-style synchronized
* methods in Javascript.
*
* Synchronized functions are created from ordinary Javascript
* functions by the Synchronizer constructor, e.g.
* new Packages.org.mozilla.javascript.Synchronizer(fun).
* The resulting object is a function that establishes an exclusive
* lock on the this object of its invocation.
*
* The Rhino shell provides a short-cut for the creation of
* synchronized methods: sync(fun) has the same effect as
* calling the above constructor.
*
* @see org.mozilla.javascript.Delegator
* @author Matthias Radestock
*/
public class Synchronizer extends Delegator {
private Object syncObject;
/**
* Create a new synchronized function from an existing one.
*
* @param obj the existing function
*/
public Synchronizer(Scriptable obj) {
super(obj);
}
/**
* Create a new synchronized function from an existing one using
* an explicit object as synchronization object.
*
* @param obj the existing function
* @param syncObject the object to synchronized on
*/
public Synchronizer(Scriptable obj, Object syncObject) {
super(obj);
this.syncObject = syncObject;
}
/**
* @see org.mozilla.javascript.Function#call
*/
@Override
public Object call(Context cx, Scriptable scope, Scriptable thisObj,
Object[] args)
{
Object sync = syncObject != null ? syncObject : thisObj;
synchronized(sync instanceof Wrapper ? ((Wrapper)sync).unwrap() : sync) {
return ((Function)obj).call(cx,scope,thisObj,args);
}
}
}