ChatClientEndpoint.java

package test.com.uaihebert.uaimockserver.websocket;

import javax.websocket.ClientEndpoint;
import javax.websocket.CloseReason;
import javax.websocket.ContainerProvider;
import javax.websocket.OnClose;
import javax.websocket.OnMessage;
import javax.websocket.OnOpen;
import javax.websocket.Session;
import javax.websocket.WebSocketContainer;
import java.net.URI;

@ClientEndpoint
public class ChatClientEndpoint {
    Session userSession = null;
    private MessageHandler messageHandler;

    public ChatClientEndpoint(URI endpointURI) {
        try {
            WebSocketContainer container = ContainerProvider
                    .getWebSocketContainer();
            container.connectToServer(this, endpointURI);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    /**
     * Callback hook for Connection open events.
     *
     * @param userSession
     *            the userSession which is opened.
     */
    @OnOpen
    public void onOpen(Session userSession) {
        this.userSession = userSession;
    }

    /**
     * Callback hook for Connection close events.
     *
     * @param userSession
     *            the userSession which is getting closed.
     * @param reason
     *            the reason for connection close
     */
    @OnClose
    public void onClose(Session userSession, CloseReason reason) {
        this.userSession = null;
    }

    /**
     * Callback hook for Message Events. This method will be invoked when a
     * client send a message.
     *
     * @param message
     *            The text message
     */
    @OnMessage
    public void onMessage(String message) {
        if (this.messageHandler != null) {
            this.messageHandler.handleMessage(message);
        }

    }

    /**
     * register message handler
     *
     * @param msgHandler
     */
    public void addMessageHandler(MessageHandler msgHandler) {
        this.messageHandler = msgHandler;
    }

    /**
     * Send a message.
     *
     * @param message
     */
    public void sendMessage(String message) {
        this.userSession.getAsyncRemote().sendText(message);
    }

    /**
     * Message handler.
     *
     * @author Jiji_Sasidharan
     */
    public static interface MessageHandler {
        public void handleMessage(String message);
    }
}