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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);
}
}
}