SimpleEchoSocket.java

//
//  ========================================================================
//  Copyright (c) 1995-2017 Mort Bay Consulting Pty. Ltd.
//  ------------------------------------------------------------------------
//  All rights reserved. This program and the accompanying materials
//  are made available under the terms of the Eclipse Public License v1.0
//  and Apache License v2.0 which accompanies this distribution.
//
//      The Eclipse Public License is available at
//      http://www.eclipse.org/legal/epl-v10.html
//
//      The Apache License v2.0 is available at
//      http://www.opensource.org/licenses/apache2.0.php
//
//  You may elect to redistribute this code under either of these licenses.
//  ========================================================================
//

package examples;

import java.util.concurrent.CountDownLatch;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;

import org.eclipse.jetty.websocket.api.Session;
import org.eclipse.jetty.websocket.api.StatusCode;
import org.eclipse.jetty.websocket.api.annotations.OnWebSocketClose;
import org.eclipse.jetty.websocket.api.annotations.OnWebSocketConnect;
import org.eclipse.jetty.websocket.api.annotations.OnWebSocketMessage;
import org.eclipse.jetty.websocket.api.annotations.WebSocket;

/**
 * Basic Echo Client Socket
 */
@WebSocket(maxTextMessageSize = 64 * 1024)
public class SimpleEchoSocket
{
    private final CountDownLatch closeLatch;
    @SuppressWarnings("unused")
    private Session session;

    public SimpleEchoSocket()
    {
        this.closeLatch = new CountDownLatch(1);
    }

    public boolean awaitClose(int duration, TimeUnit unit) throws InterruptedException
    {
        return this.closeLatch.await(duration,unit);
    }

    @OnWebSocketClose
    public void onClose(int statusCode, String reason)
    {
        System.out.printf("Connection closed: %d - %s%n",statusCode,reason);
        this.session = null;
        this.closeLatch.countDown(); // trigger latch
    }

    @OnWebSocketConnect
    public void onConnect(Session session)
    {
        System.out.printf("Got connect: %s%n",session);
        this.session = session;
        try
        {
            Future<Void> fut;
            fut = session.getRemote().sendStringByFuture("Hello");
            fut.get(2,TimeUnit.SECONDS); // wait for send to complete.

            fut = session.getRemote().sendStringByFuture("Thanks for the conversation.");
            fut.get(2,TimeUnit.SECONDS); // wait for send to complete.

            session.close(StatusCode.NORMAL,"I'm done");
        }
        catch (Throwable t)
        {
            t.printStackTrace();
        }
    }

    @OnWebSocketMessage
    public void onMessage(String msg)
    {
        System.out.printf("Got msg: %s%n",msg);
    }
}