XHRPollingTransport.java

/*
 * Copyright 2017 Sebastien Dionne
 *
 * 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.socketio.transport;

import org.atmosphere.cpr.AtmosphereRequest;
import org.atmosphere.cpr.AtmosphereResponse;
import org.atmosphere.socketio.SocketIOSession;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.concurrent.locks.ReentrantLock;

/**
 * @author Sebastien Dionne  : sebastien.dionne@gmail.com
 */
public class XHRPollingTransport extends XHRTransport {

    private static final Logger logger = LoggerFactory.getLogger(XHRPollingTransport.class);

    public static final String TRANSPORT_NAME = "xhr-polling";
    
    private final ReentrantLock lock = new ReentrantLock();

    public XHRPollingTransport(int bufferSize) {
        super(bufferSize);
    }

    @Override
    public String getName() {
        return TRANSPORT_NAME;
    }

    protected XHRPollingSessionHelper createHelper(SocketIOSession session) {
        return new XHRPollingSessionHelper(session);
    }

    protected class XHRPollingSessionHelper extends XHRSessionHelper {

        XHRPollingSessionHelper(SocketIOSession session) {
            super(session, false);
        }

        protected void startSend(AtmosphereResponse response) throws IOException {
            response.setContentType("text/plain; charset=UTF-8");
            response.setCharacterEncoding("UTF-8");
        }

        @Override
        protected void writeData(AtmosphereResponse response, String data) throws IOException {
        	lock.lock();
        	try {
	            logger.trace("calling from " + this.getClass().getName() + " : " + "writeData(string) = " + data);
	            response.getOutputStream().write(data.getBytes("UTF-8"));
	            logger.trace("WRITE SUCCESS calling from " + this.getClass().getName() + " : " + "writeData(string) = " + data);
            } finally {
            	lock.unlock();
            }
        }

        protected void finishSend(AtmosphereResponse response) throws IOException {
            response.flushBuffer();
            response.getOutputStream().flush();
        };

        protected void customConnect(AtmosphereRequest request, AtmosphereResponse response) throws IOException {
            startSend(response);
            writeData(response, "1::");
        }

    }

}