com.mchange.v1.lang.Synchronizer Maven / Gradle / Ivy
/*
* Distributed as part of mchange-commons-java 0.2.9
*
* Copyright (C) 2015 Machinery For Change, Inc.
*
* Author: Steve Waldman
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of EITHER:
*
* 1) The GNU Lesser General Public License (LGPL), version 2.1, as
* published by the Free Software Foundation
*
* OR
*
* 2) The Eclipse Public License (EPL), version 1.0
*
* You may choose which license to accept if you wish to redistribute
* or modify this work. You may offer derivatives of this work
* under the license you have chosen, or you may provide the same
* choice of license which you have been offered here.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*
* You should have received copies of both LGPL v2.1 and EPL v1.0
* along with this software; see the files LICENSE-EPL and LICENSE-LGPL.
* If not, the text of these licenses are currently available at
*
* LGPL v2.1: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
* EPL v1.0: http://www.eclipse.org/org/documents/epl-v10.php
*
*/
package com.mchange.v1.lang;
import java.lang.reflect.*;
import java.util.Set;
import java.util.HashSet;
//Java 1.3 ONLY!!!
public final class Synchronizer
{
/**
* Creates an object that implements all the same
* interfaces as the original object, but that
* synchronizes all access (using the wrappers' own lock).
*/
public static Object createSynchronizedWrapper(final Object o)
{
InvocationHandler handler = new InvocationHandler()
{
public Object invoke(Object proxy, Method m, Object[] args)
throws Throwable
{
synchronized (proxy)
{ return m.invoke( o, args ); }
}
};
Class cl = o.getClass();
return Proxy.newProxyInstance( cl.getClassLoader(),
recurseFindInterfaces(cl),
handler );
}
private static Class[] recurseFindInterfaces(Class cl)
{
Set s = new HashSet();
while( cl != null )
{
Class[] interfaces = cl.getInterfaces();
for (int i = 0, len = interfaces.length; i < len; ++i)
s.add(interfaces[i]);
cl = cl.getSuperclass();
}
Class[] out = new Class[ s.size() ];
s.toArray( out );
return out;
}
private Synchronizer()
{}
}