/**
* Copyright (c) 2013, Will Szumski
*
* This file is part of formicidae.
*
* formicidae is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* formicidae 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. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with formicidae. If not, see <http://www.gnu.org/licenses/>.
*/
/**
*
*/
package org.cowboycoders.ant.events;
import java.util.HashSet;
import java.util.Set;
import java.util.concurrent.locks.ReentrantReadWriteLock;
/**
* Stores ant messages with thread safe access
*
* @author will
*
*/
public class BroadcastMessenger<V> implements MessageDispatcher<V> {
/**
* Contains all classes listening for new messages
*/
Set<BroadcastListener<V>> listeners = new HashSet<BroadcastListener<V>>();
/**
* Used to lock {@code listeners}
*/
ReentrantReadWriteLock listenerLock = new ReentrantReadWriteLock();
/**
* Adds a listener
*
* @param listener TODO: document this
*/
@Override
public void addBroadcastListener(BroadcastListener<V> listener) {
try {
listenerLock.writeLock().lock();
listeners.add(listener);
} finally {
listenerLock.writeLock().unlock();
}
}
/**
* removes a listener
*
* @param listener TODO: document this
*/
@Override
public void removeBroadcastListener(BroadcastListener<V> listener) {
try {
listenerLock.writeLock().lock();
listeners.remove(listener);
} finally {
listenerLock.writeLock().unlock();
}
}
/**
* Returns current number of listeners
* @return number of listeners
*/
@Override
public int getListenerCount() {
try {
listenerLock.readLock().lock();
return listeners.size();
} finally {
listenerLock.readLock().unlock();
}
}
/**
* sends all listeners the message
*
* @param message TODO: document this
*/
@Override
public void sendMessage(final V message) {
try {
listenerLock.readLock().lock();
for (final BroadcastListener<V> listener : listeners) {
listener.receiveMessage(message);
}
} finally {
listenerLock.readLock().unlock();
}
}
}