private static <T> T exec(Future<T> future) throws IOException {
try {
return future.await();
} catch (Exception e) {
throw new IOException();
}
}
@Override
public void run() {
LOGGER.info("Started MQTT subscription processing thread.");
while (true) {
try {
Future<Message> future = connection.receive();
Message message = future.await();
message.ack();
EventProcessingLogic.processRawPayload(
MqttInboundEventReceiver.this, message.getPayload(), null);
} catch (InterruptedException e) {
break;
} catch (Throwable e) {
LOGGER.error(e);
}
}
}
/*
* (non-Javadoc)
*
* @see
* com.sitewhere.device.communication.mqtt.MqttLifecycleComponent#start(com.
* sitewhere.spi.server.lifecycle.ILifecycleProgressMonitor)
*/
@Override
public void start(ILifecycleProgressMonitor monitor) throws SiteWhereException {
super.start(monitor);
this.executor = Executors.newSingleThreadExecutor(new SubscribersThreadFactory());
LOGGER.info("Receiver connecting to MQTT broker at '" + getBrokerInfo() + "'...");
connection = getConnection();
LOGGER.info("Receiver connected to MQTT broker.");
// Subscribe to chosen topic.
Topic[] topics = {new Topic(getTopic(), QoS.AT_LEAST_ONCE)};
try {
Future<byte[]> future = connection.subscribe(topics);
future.await();
LOGGER.info("Subscribed to events on MQTT topic: " + getTopic());
} catch (Exception e) {
throw new SiteWhereException(
"Exception while attempting to subscribe to MQTT topic: " + getTopic(), e);
}
// Handle message processing in separate thread.
executor.execute(new MqttSubscriptionProcessor());
}