ListenerEchoSocket.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.echo;

import org.eclipse.jetty.websocket.api.Session;
import org.eclipse.jetty.websocket.api.WebSocketListener;

/**
 * Example EchoSocket using Listener.
 */
public class ListenerEchoSocket implements WebSocketListener
{
    private Session outbound;

    @Override
    public void onWebSocketBinary(byte[] payload, int offset, int len)
    {
        /* only interested in text messages */
    }

    @Override
    public void onWebSocketClose(int statusCode, String reason)
    {
        this.outbound = null;
    }

    @Override
    public void onWebSocketConnect(Session session)
    {
        this.outbound = session;
    }

    @Override
    public void onWebSocketError(Throwable cause)
    {
        cause.printStackTrace(System.err);
    }

    @Override
    public void onWebSocketText(String message)
    {
        if ((outbound != null) && (outbound.isOpen()))
        {
            System.out.printf("Echoing back message [%s]%n",message);
            // echo the message back
            outbound.getRemote().sendString(message,null);
        }
    }
}