ch.rasc.s4ws.drawboard.DrawboardWebSocketHandler.java Source code

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Here is the source code for ch.rasc.s4ws.drawboard.DrawboardWebSocketHandler.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF 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 ch.rasc.s4ws.drawboard;

import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

import org.apache.juli.logging.Log;
import org.apache.juli.logging.LogFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.socket.BinaryMessage;
import org.springframework.web.socket.CloseStatus;
import org.springframework.web.socket.TextMessage;
import org.springframework.web.socket.WebSocketSession;
import org.springframework.web.socket.handler.AbstractWebSocketHandler;

import reactor.bus.Event;
import reactor.bus.EventBus;
import reactor.spring.context.annotation.Consumer;
import reactor.spring.context.annotation.Selector;

@Consumer
public class DrawboardWebSocketHandler extends AbstractWebSocketHandler {

    private static final Log log = LogFactory.getLog(DrawboardWebSocketHandler.class);

    @Autowired
    public EventBus eventBus;

    private final Map<String, WebSocketSession> sessions = new ConcurrentHashMap<>();

    @SuppressWarnings("resource")
    @Selector("sendString")
    public void consumeSendString(Event<String> event) {
        String receiver = event.getHeaders().get("sessionId");
        TextMessage txtMessage = new TextMessage(event.getData());
        if (receiver != null) {
            WebSocketSession session = this.sessions.get(receiver);
            if (session != null) {
                try {
                    session.sendMessage(txtMessage);
                } catch (IOException e) {
                    log.error("sendMessage", e);
                }
            }
        } else {
            String excludeId = event.getHeaders().get("excludeId");
            for (WebSocketSession session : this.sessions.values()) {
                if (!session.getId().equals(excludeId)) {
                    try {
                        session.sendMessage(txtMessage);
                    } catch (IOException e) {
                        log.error("sendMessage", e);
                    }
                }
            }
        }
    }

    @SuppressWarnings("resource")
    @Selector("sendBinary")
    public void consumeSendBinary(Event<ByteBuffer> event) {

        String receiver = event.getHeaders().get("sessionId");
        BinaryMessage binMsg = new BinaryMessage(event.getData());
        if (receiver != null) {
            WebSocketSession session = this.sessions.get(receiver);
            if (session != null) {
                try {
                    session.sendMessage(binMsg);
                } catch (IOException e) {
                    log.error("sendMessage", e);
                }
            }
        } else {
            String excludeId = event.getHeaders().get("excludeId");
            for (WebSocketSession session : this.sessions.values()) {
                if (!session.getId().equals(excludeId)) {
                    try {
                        session.sendMessage(binMsg);
                    } catch (IOException e) {
                        log.error("sendMessage", e);
                    }
                }
            }
        }

    }

    @Override
    public void afterConnectionEstablished(WebSocketSession session) throws Exception {
        this.sessions.put(session.getId(), session);
        this.eventBus.notify("newPlayer", Event.wrap(session.getId()));
    }

    @Override
    public void handleTextMessage(WebSocketSession session, final TextMessage message) throws Exception {

        Event<String> event = Event.wrap(message.getPayload());
        event.getHeaders().set("sessionId", session.getId());
        this.eventBus.notify("incomingMessage", event);
    }

    @Override
    public void afterConnectionClosed(WebSocketSession session, CloseStatus status) throws Exception {
        this.sessions.remove(session.getId());
        this.eventBus.notify("removePlayer", Event.wrap(session.getId()));
    }

}