org.socketio.netty.session.DelayedSessionFuture Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of socketIo4Netty Show documentation
Socket.IO Java server based on Netty
There is a newer version: 1.1.2
/**
 * Copyright 2012 Ronen Hamias, Anton Kharenko
 *
 * 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.socketio.netty.session;

import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.atomic.AtomicReference;

import org.socketio.netty.ISession;
import org.socketio.netty.ISessionFuture;
import org.socketio.netty.ISessionFutureListener;

public class DelayedSessionFuture implements ISessionFuture {
	
	private final ConcurrentLinkedQueue listeners = new ConcurrentLinkedQueue();
	
	private final ISession session;
	
	private AtomicReference sessionFutureHolder = new AtomicReference(null);
	
	public DelayedSessionFuture(ISession session) {
		this.session = session;
	}
	
	public void initSessionFuture(ISessionFuture sessionFuture) {
		if (sessionFutureHolder.compareAndSet(null, sessionFuture)) {
			ISessionFutureListener listener;
			while((listener = listeners.poll()) != null) {
				sessionFuture.addListener(listener);
			}
		} else {
			throw new IllegalStateException("Session future already initialized");
		}
	}

	@Override
	public ISession getSession() {
		return session;
	}

	@Override
	public boolean isDone() {
		if (sessionFutureHolder.get() != null) {
			return sessionFutureHolder.get().isDone();
		} else {
			return false;
		}
	}

	@Override
	public boolean isSuccess() {
		if (sessionFutureHolder.get() != null) {
			return sessionFutureHolder.get().isSuccess();
		} else {
			return false;
		}
	}

	@Override
	public Throwable getCause() {
		if (sessionFutureHolder.get() != null) {
			return sessionFutureHolder.get().getCause();
		} else {
			return null;
		}
	}

	@Override
	public void addListener(final ISessionFutureListener listener) {
		if (listener == null) {
            throw new NullPointerException("listener");
        }
		
		if (sessionFutureHolder.get() != null) {
			sessionFutureHolder.get().addListener(listener);
		} else {
			listeners.add(listener);
		}
	}

	@Override
	public void removeListener(ISessionFutureListener listener) {
		if (listener == null) {
            throw new NullPointerException("listener");
        }
		
		if (sessionFutureHolder.get() != null) {
			sessionFutureHolder.get().removeListener(listener);
		} else {
			while (listeners.remove(listener));
		}
	}
}