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MqttConsumer.java
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MqttConsumer.java
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/*
* Copyright (c) 2017 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 io.siddhi.extension.io.mqtt.source;
import io.siddhi.core.stream.input.source.SourceEventListener;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.eclipse.paho.client.mqttv3.IMqttDeliveryToken;
import org.eclipse.paho.client.mqttv3.MqttCallback;
import org.eclipse.paho.client.mqttv3.MqttClient;
import org.eclipse.paho.client.mqttv3.MqttException;
import org.eclipse.paho.client.mqttv3.MqttMessage;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.ReentrantLock;
/**
* {@code ConsumerMqtt }Handle the Mqtt consuming tasks.
*/
public class MqttConsumer {
private static final Logger log = LogManager.getLogger(MqttConsumer.class);
public SourceEventListener sourceEventListener;
private boolean isPaused;
private ReentrantLock lock;
private Condition condition;
public MqttConsumer(SourceEventListener sourceEventListener) {
this.sourceEventListener = sourceEventListener;
lock = new ReentrantLock();
condition = lock.newCondition();
}
public void subscribe(String topicOption, int qosOption,
MqttClient client) throws MqttException {
MqttSourceCallBack callback = new MqttSourceCallBack();
client.setCallback(callback);
client.subscribe(topicOption, qosOption);
}
/**
* MqttCallback is called when an event is received.
*/
public class MqttSourceCallBack implements MqttCallback {
@Override
public void connectionLost(Throwable throwable) {
log.debug("MQTT connection not reachable");
}
@Override
public void messageArrived(String topic, MqttMessage mqttMessage) throws Exception {
if (isPaused) {
lock.lock();
try {
while (!isPaused) {
condition.await();
}
} catch (InterruptedException ie) {
Thread.currentThread().interrupt();
} finally {
lock.unlock();
}
}
String message = new String(mqttMessage.getPayload(), "UTF-8");
sourceEventListener.onEvent(message, null);
}
@Override
public void deliveryComplete(IMqttDeliveryToken iMqttDeliveryToken) {
}
}
public void pause() {
isPaused = true;
}
public void resume() {
isPaused = false;
try {
lock.lock();
condition.signalAll();
} finally {
lock.unlock();
}
}
}