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Apache Commons Net library contains a collection of network utilities and protocol implementations.
Supported protocols include: Echo, Finger, FTP, NNTP, NTP, POP3(S), SMTP(S), Telnet, Whois
/*
* 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.commons.net.util;
import java.io.Serializable;
import java.util.EventListener;
import java.util.Iterator;
import java.util.concurrent.CopyOnWriteArrayList;
/**
*/
public class ListenerList implements Serializable, Iterable
{
private static final long serialVersionUID = -1934227607974228213L;
private final CopyOnWriteArrayList listeners;
public ListenerList()
{
listeners = new CopyOnWriteArrayList<>();
}
public void addListener(final EventListener listener)
{
listeners.add(listener);
}
public void removeListener(final EventListener listener)
{
listeners.remove(listener);
}
public int getListenerCount()
{
return listeners.size();
}
/**
* Return an {@link Iterator} for the {@link EventListener} instances.
*
* @return an {@link Iterator} for the {@link EventListener} instances
* @since 2.0
* TODO Check that this is a good defensive strategy
*/
@Override
public Iterator iterator() {
return listeners.iterator();
}
}