MeteorChat.java

/*
 * Copyright 2014 Jeanfrancois Arcand
 *
 * 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.atmosphere.samples.chat;

import org.atmosphere.client.TrackMessageSizeInterceptor;
import org.atmosphere.config.service.MeteorService;
import org.atmosphere.cpr.AtmosphereResourceEventListenerAdapter;
import org.atmosphere.cpr.BroadcasterFactory;
import org.atmosphere.cpr.DefaultBroadcaster;
import org.atmosphere.cpr.Meteor;
import org.atmosphere.interceptor.AtmosphereResourceLifecycleInterceptor;

import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.Date;

/**
 * Simple Servlet that implement the logic to build a Chat application using
 * a {@link Meteor} to suspend and broadcast chat message.
 *
 * @author Jeanfrancois Arcand
 */
@MeteorService(path = "/*", atmosphereConfig = "org.atmosphere.useStream=false", interceptors = {AtmosphereResourceLifecycleInterceptor.class, TrackMessageSizeInterceptor.class})
public class MeteorChat extends HttpServlet {

    /**
     * Create a {@link Meteor} and use it to suspend the response.
     *
     * @param req An {@link HttpServletRequest}
     * @param res An {@link HttpServletResponse}
     */
    @Override
    public void doGet(HttpServletRequest req, HttpServletResponse res) throws IOException {
        // Set the logger level to TRACE to see what's happening.
        Meteor.build(req).addListener(new AtmosphereResourceEventListenerAdapter());
        res.getWriter().print("");
    }

    /**
     * Re-use the {@link Meteor} created on the first GET for broadcasting message.
     *
     * @param req An {@link HttpServletRequest}
     * @param res An {@link HttpServletResponse}
     */
    @Override
    public void doPost(HttpServletRequest req, HttpServletResponse res) throws IOException {
        for (int i=0; i <50; i++) {
            BroadcasterFactory.getDefault().lookup(DefaultBroadcaster.class, "/*").broadcast(getString(1000000));
        }
    }

    protected String getString(int len) {
        StringBuilder b = new StringBuilder();
        for (int i = 0; i < len; i++) {
            if (i % 100 == 0) {
                b.append("\n");
            } else {
                b.append('A');
            }
            //b.append(i);

        }
        return b.toString();
    }

    private final static class Data {

        private final String text;
        private final String author;

        public Data(String author, String text) {
            this.author = author;
            this.text = text;
        }

        public String toString() {
            return "{ \"text\" : \"" + text + "\", \"author\" : \"" + author + "\" , \"time\" : " + new Date().getTime() + "}";
        }
    }
}