org.wso2.carbon.sample.websocket.WebSocketServer.java Source code

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Here is the source code for org.wso2.carbon.sample.websocket.WebSocketServer.java

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/*
 * Copyright (c) 2016, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
 *
 * WSO2 Inc. licenses this file to you 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.wso2.carbon.sample.websocket;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.eclipse.jetty.server.Server;
import org.eclipse.jetty.server.ServerConnector;
import org.eclipse.jetty.servlet.ServletContextHandler;
import org.eclipse.jetty.websocket.jsr356.server.deploy.WebSocketServerContainerInitializer;

import javax.websocket.*;
import javax.websocket.server.ServerContainer;
import javax.websocket.server.ServerEndpoint;
import java.io.IOException;

public class WebSocketServer {

    private static Session session;
    private static Log log = LogFactory.getLog(WebSocketServer.class);
    private Server server = null;

    public void start(int port, String host) {
        server = new Server();
        ServerConnector connector = new ServerConnector(server);
        connector.setPort(port);
        connector.setHost(host);
        server.addConnector(connector);

        // Setup the basic application "context" for this application at "/"
        // This is also known as the handler tree (in jetty speak)
        ServletContextHandler context = new ServletContextHandler(ServletContextHandler.SESSIONS);
        context.setContextPath("/");
        server.setHandler(context);

        try {
            // Initialize javax.websocket layer
            ServerContainer wscontainer = WebSocketServerContainerInitializer.configureContext(context);

            // Add WebSocket endpoint to javax.websocket layer
            wscontainer.addEndpoint(EventSocket.class);

            new Thread(new Runnable() {
                @Override
                public void run() {
                    try {
                        server.start();
                        server.join();
                    } catch (Exception e) {
                        log.error(e);
                    }
                }
            }).start();

        } catch (Throwable t) {
            log.error(t);
        }
    }

    public void stop() {
        if (server != null) {
            try {
                server.stop();
            } catch (Exception e) {
                log.error(e);
            }
            server = null;
        }
    }

    public void send(String message, int retryCount) {
        int count = 0;
        while (session == null && count < retryCount) {
            try {
                log.info("Waiting for the client to connect");
                Thread.sleep(3000);

            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            count++;
        }
        if (session != null) {
            try {
                session.getBasicRemote().sendText(message);
            } catch (IOException e) {
                log.error("Error server sending message", e);
            }
        } else {
            log.error("Session not available to send message");
        }

    }

    @ServerEndpoint(value = "/events/")
    public static class EventSocket {
        @OnOpen
        public void onWebSocketConnect(Session sess) {
            log.info("Server Socket Connected: " + sess);
            session = sess;
        }

        @OnMessage
        public void onWebSocketText(String message) {
            log.info("Server Received TEXT message: " + message);
        }

        @OnClose
        public void onWebSocketClose(CloseReason reason) {
            log.info("Server Socket Closed: " + reason);
            session = null;
        }

        @OnError
        public void onWebSocketError(Throwable cause) {
            log.error("Server Socket Error", cause);
            session = null;
        }
    }

}