Clock.java

/*
 * 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 com.asual.summer.sample.websocket;

import java.text.SimpleDateFormat;
import java.util.Date;

import javax.ws.rs.GET;
import javax.ws.rs.POST;
import javax.ws.rs.Path;

import org.atmosphere.annotation.Suspend;
import org.atmosphere.cpr.Broadcaster;
import org.atmosphere.cpr.BroadcasterFactory;
import org.atmosphere.jersey.Broadcastable;
import org.atmosphere.jersey.JerseyBroadcaster;

//import org.atmosphere.cpr.Broadcaster;
//import org.atmosphere.jersey.JerseyBroadcaster;
//import org.atmosphere.jersey.SuspendResponse;
//
//import com.google.appengine.api.taskqueue.Queue;
//import com.google.appengine.api.taskqueue.QueueFactory;
//import com.google.appengine.api.taskqueue.TaskOptions;
import com.google.appengine.api.taskqueue.Queue;
import com.google.appengine.api.taskqueue.QueueFactory;
import com.google.appengine.api.taskqueue.TaskOptions;
import com.sun.jersey.spi.resource.Singleton;

/**
 * 
 * @author Rostislav Hristov
 *
 */
@Path("/clock")
@Singleton
public class Clock {
	
    private Date date = new Date();
    private Broadcaster topic = BroadcasterFactory.getDefault().get(JerseyBroadcaster.class, "clock");
	private SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss Z (EEE, dd MMM yyyy)");
 
	public Clock() {
		queue();
	}
	
	@GET
    @Suspend(resumeOnBroadcast = true)
	public Broadcastable subscribe() {
		return new Broadcastable(topic);
	}
	
	@POST
	public void tick() {
		date.setTime(System.currentTimeMillis());
		topic.broadcast(dateFormat.format(date));
		queue();
	}
	
	public void queue() {
		Queue queue = QueueFactory.getDefaultQueue();
		queue.add(
				TaskOptions.Builder
				.withUrl("/websocket/clock")
				.method(TaskOptions.Method.POST)
				.countdownMillis(1000));		
	}

}