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/*
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*
*/
package org.apache.qpid.server.cluster.util;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.util.Set;
import java.util.HashSet;
/**
* Allows a method to be invoked on a list of listeners with one call
*
*/
public class InvokeMultiple <T> implements InvocationHandler
{
private final Set<T> _targets = new HashSet<T>();
private final T _proxy;
public InvokeMultiple(Class<? extends T> type)
{
_proxy = (T) Proxy.newProxyInstance(type.getClassLoader(), new Class[]{type}, this);
}
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable
{
Set<T> targets;
synchronized(this)
{
targets = new HashSet<T>(_targets);
}
for(T target : targets)
{
method.invoke(target, args);
}
return null;
}
public synchronized void addListener(T t)
{
_targets.add(t);
}
public synchronized void removeListener(T t)
{
_targets.remove(t);
}
public T getProxy()
{
return _proxy;
}
}
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