/**
* Emits the next message from the queue as a tuple.
*
* <p>Serialization schemes returning null will immediately ack and then emit unanchored on the
* {@link #ERROR_STREAM_NAME} stream for further handling by the consumer.
*
* <p>If no message is ready to emit, this will wait a short time ({@link #WAIT_FOR_NEXT_MESSAGE})
* for one to arrive on the queue, to avoid a tight loop in the spout worker.
*/
@Override
public void nextTuple() {
if (spoutActive && amqpConsumer != null) {
try {
final QueueingConsumer.Delivery delivery = amqpConsumer.nextDelivery(WAIT_FOR_NEXT_MESSAGE);
if (delivery == null) return;
final long deliveryTag = delivery.getEnvelope().getDeliveryTag();
final byte[] message = delivery.getBody();
/////////////////// new rpc
BasicProperties props = delivery.getProperties();
BasicProperties replyProps =
new BasicProperties.Builder().correlationId(props.getCorrelationId()).build();
//////////////////////////////
List<Object> deserializedMessage = serialisationScheme.deserialize(message);
if (deserializedMessage != null && deserializedMessage.size() > 0) {
// let's see what's inside the Object List (checking)
/*System.out.println("Lenght of the list : "+ deserializedMessage.size() +"\n");
for (int i =0; i< deserializedMessage.size(); i++){
Object obj=deserializedMessage.get(i);
System.out.println("Object value: "+ obj + "\n" );
}*/
ArrayList li = new ArrayList();
li.add(deserializedMessage.get(0));
li.add(props);
li.add(replyProps);
deserializedMessage = li;
collector.emit(deserializedMessage, deliveryTag);
/////////// new for AMQPSpout RPC+JSON
try {
String response = "your name was: " + deserializedMessage.get(0) + " ";
this.amqpChannel.basicPublish(
"", props.getReplyTo(), replyProps, response.getBytes("UTF-8"));
// this.amqpChannel.basicAck(delivery.getEnvelope().getDeliveryTag(), false);
this.amqpChannel.basicAck(deliveryTag, false);
}
/// publishjson(props, replyProps, delivery.detEnvelope().getDeliveryTag());
// try{
// publishjson(props, replyProps);
// }
catch (IOException e) {
log.error("Error when publishing to the response queue", e);
}
////////////////
} else {
handleMalformedDelivery(deliveryTag, message);
}
} catch (ShutdownSignalException e) {
log.warn("AMQP connection dropped, will attempt to reconnect...");
Utils.sleep(WAIT_AFTER_SHUTDOWN_SIGNAL);
reconnect();
} catch (InterruptedException e) {
// interrupted while waiting for message, big deal
}
}
}
public void nextTuple() {
if (amqpConsumer != null) {
try {
final QueueingConsumer.Delivery delivery = amqpConsumer.nextDelivery(WAIT_FOR_NEXT_MESSAGE);
if (delivery == null) return;
final long deliveryTag = delivery.getEnvelope().getDeliveryTag();
final byte[] message = delivery.getBody();
log.debug("Sending message:" + new String(message));
log.debug("Getting next tuple - " + (messageCount++));
if (messageCount < 0) {
log.debug("You just get a number of messages = max value of long! Wow! Reseting to 0");
this.messageCount = 0;
}
collector.emit(serialisationScheme.deserialize(message), deliveryTag);
} catch (InterruptedException e) {
// interrupted while waiting for message, big deal
}
}
}
/**
* Declares the output fields of this spout according to the provided {@link
* backtype.storm.spout.Scheme}.
*
* <p>Additionally declares an error stream (see {@link #ERROR_STREAM_NAME} for handling malformed
* or empty messages to avoid infinite retry loops
*/
@Override
public void declareOutputFields(OutputFieldsDeclarer declarer) {
declarer.declare(serialisationScheme.getOutputFields());
declarer.declareStream(ERROR_STREAM_NAME, new Fields("deliveryTag", "bytes", "otherbytes"));
}
public void declareOutputFields(OutputFieldsDeclarer declarer) {
declarer.declare(serialisationScheme.getOutputFields());
}