com.codeveo.lago.bot.stomp.client.WebSocketStompSession.java Source code

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Here is the source code for com.codeveo.lago.bot.stomp.client.WebSocketStompSession.java

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/*
 * Copyright 2002-2014 the original author or authors.
 *
 * Licensed 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 com.codeveo.lago.bot.stomp.client;

import java.io.IOException;
import java.nio.charset.Charset;
import java.util.concurrent.atomic.AtomicInteger;

import org.springframework.messaging.Message;
import org.springframework.messaging.MessageHeaders;
import org.springframework.messaging.converter.MappingJackson2MessageConverter;
import org.springframework.messaging.converter.MessageConverter;
import org.springframework.messaging.simp.stomp.StompCommand;
import org.springframework.messaging.simp.stomp.StompEncoder;
import org.springframework.messaging.simp.stomp.StompHeaderAccessor;
import org.springframework.messaging.support.MessageBuilder;
import org.springframework.util.Assert;
import org.springframework.web.socket.CloseStatus;
import org.springframework.web.socket.TextMessage;
import org.springframework.web.socket.WebSocketSession;

public class WebSocketStompSession {

    private static final Charset UTF_8 = Charset.forName("UTF-8");

    public static final byte[] EMPTY_PAYLOAD = new byte[0];

    private final WebSocketSession webSocketSession;

    private final MessageConverter messageConverter;

    private final StompEncoder encoder = new StompEncoder();

    private final AtomicInteger subscriptionIndex = new AtomicInteger();

    public WebSocketStompSession(WebSocketSession delegate) {
        this(delegate, new MappingJackson2MessageConverter());
    }

    public WebSocketStompSession(WebSocketSession webSocketSession, MessageConverter messageConverter) {
        Assert.notNull(webSocketSession);
        Assert.notNull(messageConverter);
        this.webSocketSession = webSocketSession;
        this.messageConverter = messageConverter;
    }

    public void subscribe(String destination, String receiptId) {
        StompHeaderAccessor headers = StompHeaderAccessor.create(StompCommand.SUBSCRIBE);
        headers.setSubscriptionId("sub-" + this.subscriptionIndex.getAndIncrement());
        headers.setDestination(destination);
        if (receiptId != null) {
            headers.setReceipt(receiptId);
        }
        sendInternal(MessageBuilder.withPayload(EMPTY_PAYLOAD).setHeaders(headers).build());
    }

    public void send(String destination, Object payload) {
        StompHeaderAccessor headers = StompHeaderAccessor.create(StompCommand.SEND);
        headers.setDestination(destination);
        sendInternal(
                (Message<byte[]>) this.messageConverter.toMessage(payload, new MessageHeaders(headers.toMap())));
    }

    public void disconnect() {
        StompHeaderAccessor headers = StompHeaderAccessor.create(StompCommand.DISCONNECT);
        Message<byte[]> message = MessageBuilder.withPayload(EMPTY_PAYLOAD).setHeaders(headers).build();
        sendInternal(message);
        try {
            this.webSocketSession.close(CloseStatus.GOING_AWAY);
        } catch (IOException e) {
            throw new IllegalStateException(e);
        }
    }

    private void sendInternal(Message<byte[]> message) {
        byte[] bytes = this.encoder.encode(message);
        try {
            this.webSocketSession.sendMessage(new TextMessage(new String(bytes, UTF_8)));
        } catch (IOException e) {
            throw new IllegalStateException(e);
        }
    }

    @Override
    public String toString() {
        return "webSocketSession=" + this.webSocketSession;
    }
}