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package org.eclipse.om2m.binding.mqtt.util;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.SynchronousQueue;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.eclipse.paho.client.mqttv3.MqttClient;
import org.eclipse.paho.client.mqttv3.MqttException;
public final class QueueSender {
private static final Log LOGGER = LogFactory.getLog(QueueSender.class);
private static ExecutorService threadPool;
static {
int queueSize = MqttConstants.MQTT_QUEUE_SENDER_SIZE <= 2 ? 2
: MqttConstants.MQTT_QUEUE_SENDER_SIZE;
threadPool = new ThreadPoolExecutor(2, queueSize, 1, TimeUnit.MINUTES,
new SynchronousQueue<Runnable>());
}
public static void queue(MqttClient mqttClient, String topic, byte[] payload){
LOGGER.debug("Sending MQTT message to " + mqttClient.getServerURI() + " topic: " + topic);
threadPool.execute(new MqttSender(mqttClient, topic, payload));
}
private static class MqttSender implements Runnable {
private MqttClient mqttClient;
private String topic;
private byte[] payload;
public MqttSender(MqttClient mqttClient, String topic, byte[] payload) {
super();
this.mqttClient = mqttClient;
this.topic = topic;
this.payload = payload;
}
@Override
public void run() {
try {
this.mqttClient.publish(topic, payload, 1, false);
} catch (MqttException e) {
LOGGER.warn("Error publishing on topic: " + this.topic
+ " of broker " + this.mqttClient.getServerURI()
+ ". Error: " + e.getMessage());
}
}
}
private QueueSender(){
// Empty and private constructor to avoid class creation
}
}
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