/**
* 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 run() {
System.out.println(" [x] Awaiting RPC requests");
while (run.get()) {
QueueingConsumer.Delivery delivery;
try {
delivery = consumer.nextDelivery(2000);
} catch (ShutdownSignalException e2) {
break;
} catch (ConsumerCancelledException e2) {
break;
} catch (InterruptedException e2) {
continue;
}
BasicProperties props = delivery.getProperties();
BasicProperties replyProps =
new BasicProperties.Builder().correlationId(props.getCorrelationId()).build();
try {
Object o;
synchronized (registry) {
o = Rmivm.deserialise(delivery.getBody(), registry);
}
byte[] outBytes = Rmivm.serialize(o);
synchronized (channel) {
channel.basicPublish("", props.getReplyTo(), replyProps, outBytes);
channel.basicAck(delivery.getEnvelope().getDeliveryTag(), false);
}
} catch (Exception e) {
try {
synchronized (channel) {
channel.basicPublish(
"", props.getReplyTo(), replyProps, Rmivm.serialize(new Exception("Boom!")));
}
} catch (IOException e1) {
// panic
}
}
}
System.out.println(" [x] Shutting Down");
}
public void serveRequests() {
while (true) {
try {
Delivery delivery = consumer.nextDelivery();
BasicProperties props = delivery.getProperties();
channel.basicAck(delivery.getEnvelope().getDeliveryTag(), false);
System.out.println("Received API call...replying...");
channel.basicPublish("", props.getReplyTo(), null, getResponse(delivery).getBytes("UTF-8"));
} catch (Exception e) {
System.out.println(e.toString());
}
}
}
@Override
public void run() {
try {
Connection connection = factory.newConnection();
String uuid = UUID.randomUUID().toString();
String queueName = RPC_QUEUE_NAME + uuid;
Map<String, Channel> result =
this.server.initChannel(connection, this.assignedNumber, queueName);
Channel consumerChannel = result.get("consumer");
Channel publisherChannel = result.get("publisher");
QueueingConsumer consumer = new QueueingConsumer(consumerChannel);
consumerChannel.basicConsume(queueName, true, consumer);
System.out.println("in server ");
while (true) {
QueueingConsumer.Delivery delivery = consumer.nextDelivery();
// System.out.printf("delivery is %s, body is %s", delivery, new
// String(delivery.getBody()));
BasicProperties props = delivery.getProperties();
// System.out.printf("correlationId is %s", props.getCorrelationId());
BasicProperties replyProps =
new BasicProperties.Builder()
.correlationId(props.getCorrelationId())
.messageId(props.getMessageId())
.build();
String response = new String(delivery.getBody());
// System.out.printf("response is %s", new String(delivery.getBody()));
// System.out.printf("reply to is %s", props.getReplyTo() );
publisherChannel.basicPublish(
PUBLISHER_EXCHANGE_NAME, props.getReplyTo(), replyProps, response.getBytes());
// consumerChannel.basicAck(delivery.getEnvelope().getDeliveryTag(), false);
}
} catch (Exception e) {
e.printStackTrace();
}
}
@Override
public void handleMessage(String topic, Map<String, Object> message, BasicProperties props) {
if (props.getCorrelationId().equals(requestId)) {
handleResponse(message, props);
}
}
public MessageProperties toMessageProperties(
final BasicProperties source, final Envelope envelope, final String charset) {
MessageProperties target = new MessageProperties();
Map<String, Object> headers = source.getHeaders();
if (!CollectionUtils.isEmpty(headers)) {
for (Map.Entry<String, Object> entry : headers.entrySet()) {
String key = entry.getKey();
if (MessageProperties.X_DELAY.equals(key)) {
Object value = entry.getValue();
if (value instanceof Integer) {
target.setReceivedDelay((Integer) value);
}
} else {
target.setHeader(key, convertLongStringIfNecessary(entry.getValue(), charset));
}
}
}
target.setTimestamp(source.getTimestamp());
target.setMessageId(source.getMessageId());
target.setReceivedUserId(source.getUserId());
target.setAppId(source.getAppId());
target.setClusterId(source.getClusterId());
target.setType(source.getType());
Integer deliveryMode = source.getDeliveryMode();
if (deliveryMode != null) {
target.setReceivedDeliveryMode(MessageDeliveryMode.fromInt(deliveryMode));
}
target.setDeliveryMode(null);
target.setExpiration(source.getExpiration());
target.setPriority(source.getPriority());
target.setContentType(source.getContentType());
target.setContentEncoding(source.getContentEncoding());
String correlationId = source.getCorrelationId();
if (StringUtils.hasText(correlationId)) {
target.setCorrelationId(source.getCorrelationId());
}
String replyTo = source.getReplyTo();
if (replyTo != null) {
target.setReplyTo(replyTo);
}
if (envelope != null) {
target.setReceivedExchange(envelope.getExchange());
target.setReceivedRoutingKey(envelope.getRoutingKey());
target.setRedelivered(envelope.isRedeliver());
target.setDeliveryTag(envelope.getDeliveryTag());
}
return target;
}
public static MessageProperties valueOf(BasicProperties bp) {
MessageProperties mp = new MessageProperties();
mp.setAppId(bp.getAppId());
mp.setClusterId(bp.getClusterId());
mp.setContentEncoding(bp.getContentEncoding());
mp.setContentType(bp.getContentType());
mp.setCorrelationId(bp.getCorrelationId());
mp.setDeliveryMode(bp.getDeliveryMode());
mp.setExpiration(bp.getExpiration());
mp.setHeaders(bp.getHeaders());
mp.setMessageId(bp.getMessageId());
mp.setPriority(bp.getPriority());
mp.setReplyTo(bp.getReplyTo());
mp.setTimestamp(bp.getTimestamp());
mp.setType(bp.getType());
mp.setUserId(bp.getUserId());
return mp;
}
