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mqtt-client provides an ASL 2.0 licensed API to MQTT. It takes care of automatically reconnecting to your MQTT server and restoring your client session if any network failures occur. Applications can use a blocking API style, a futures based API, or a callback/continuations passing API style.

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/**
 * Copyright (C) 2010-2012, FuseSource Corp.  All rights reserved.
 *
 *     http://fusesource.com
 *
 * 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 org.fusesource.mqtt.client;

import org.fusesource.hawtbuf.Buffer;
import org.fusesource.hawtbuf.UTF8Buffer;
import org.fusesource.hawtdispatch.DispatchQueue;
import org.fusesource.hawtdispatch.Task;

/**
 * 
 * 
 *
 * @author Hiram Chirino
 */
public class Message {

    private final UTF8Buffer topic;
    private final Buffer payload;
    private Callback>  onComplete;
    private final DispatchQueue queue;
    boolean blocking = false;

    public Message(DispatchQueue queue, UTF8Buffer topic, Buffer payload, Callback> onComplete) {
        this.queue = queue;
        this.payload = payload;
        this.topic = topic;
        this.onComplete = onComplete;
    }

    public byte[] getPayload() {
        return payload.toByteArray();
    }

    /**
     * Using getPayloadBuffer() is lower overhead version of getPayload()
     * since it avoids a byte array copy.
     * @return
     */
    public Buffer getPayloadBuffer() {
        return payload;
    }

    public String getTopic() {
        return topic.toString();
    }

    /**
     * Using getTopicBuffer is lower overhead version of getTopic()
     * since it avoid doing UTF-8 decode.
     * @return
     */
    public UTF8Buffer getTopicBuffer() {
        return topic;
    }

    public void ack() {
        if( blocking ) {
            final Promise future = new Promise();
            ack(future);
            try {
                future.await();
            } catch (Exception e) {
                throw new RuntimeException(e);
            }
        } else {
            ack(null);
        }
    }

    public void ack(final Callback onAcked) {
        if(onComplete!=null) {
            queue.execute(new Task() {
                Callback> onCompleteCopy = onComplete;
                @Override
                public void run() {
                    onCompleteCopy.onSuccess(onAcked);
                }
            });
            onComplete = null;
        } else {
            if( onAcked!=null ) {
                onAcked.onSuccess(null);
            }
        }
    }

}