InMemoryPushPushPipe.java

/*
 * RED5 Open Source Flash Server - http://code.google.com/p/red5/
 * 
 * Copyright 2006-2012 by respective authors (see below). All rights reserved.
 * 
 * Licensed 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.red5.server.messaging;

import java.io.IOException;
import java.util.Map;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * A simple in-memory version of push-push pipe.
 * It is triggered by an active provider to push messages
 * through it to an event-driven consumer.
 * 
 * @author The Red5 Project (red5@osflash.org)
 * @author Steven Gong (steven.gong@gmail.com)
 */
public class InMemoryPushPushPipe extends AbstractPipe {

	private static final Logger log = LoggerFactory.getLogger(InMemoryPushPushPipe.class);

	/** {@inheritDoc} */
	@Override
	public boolean subscribe(IConsumer consumer, Map<String, Object> paramMap) {
		if (consumer instanceof IPushableConsumer) {
			boolean success = super.subscribe(consumer, paramMap);
			if (success) {
				fireConsumerConnectionEvent(consumer, PipeConnectionEvent.CONSUMER_CONNECT_PUSH, paramMap);
			}
			return success;
		} else {
			throw new IllegalArgumentException("Non-pushable consumer not supported by PushPushPipe");
		}
	}

	/** {@inheritDoc} */
	@Override
	public boolean subscribe(IProvider provider, Map<String, Object> paramMap) {
		boolean success = super.subscribe(provider, paramMap);
		if (success) {
			fireProviderConnectionEvent(provider, PipeConnectionEvent.PROVIDER_CONNECT_PUSH, paramMap);
		}
		return success;
	}

	/** {@inheritDoc} */
	public IMessage pullMessage() {
		return null;
	}

	/** {@inheritDoc} */
	public IMessage pullMessage(long wait) {
		return null;
	}

	/**
	 * Pushes a message out to all the PushableConsumers.
	 * 
	 * @param message the message to be pushed to consumers.
	 */
	public void pushMessage(IMessage message) throws IOException {
		for (IConsumer consumer : consumers) {
			try {
				IPushableConsumer pcon = (IPushableConsumer) consumer;
				pcon.pushMessage(this, message);
			} catch (Throwable t) {
				if (t instanceof IOException) {
					// Pass this along
					throw (IOException) t;
				}
				log.error("Exception when pushing message to consumer", t);
			}
		}
	}
}