protected void addAndStartConsumers(int delta) {
synchronized (this.consumersMonitor) {
if (this.consumers != null) {
for (int i = 0; i < delta; i++) {
BlockingQueueConsumer consumer = createBlockingQueueConsumer();
this.consumers.put(consumer, true);
AsyncMessageProcessingConsumer processor = new AsyncMessageProcessingConsumer(consumer);
this.taskExecutor.execute(processor);
try {
FatalListenerStartupException startupException = processor.getStartupException();
if (startupException != null) {
this.consumers.remove(consumer);
throw new AmqpIllegalStateException(
"Fatal exception on listener startup", startupException);
}
} catch (InterruptedException ie) {
Thread.currentThread().interrupt();
} catch (Exception e) {
consumer.stop();
logger.error("Error starting new consumer", e);
consumers.remove(consumer);
}
}
}
}
}
private void restart(BlockingQueueConsumer consumer) {
synchronized (this.consumersMonitor) {
if (this.consumers != null) {
try {
// Need to recycle the channel in this consumer
consumer.stop();
// Ensure consumer counts are correct (another is going
// to start because of the exception, but
// we haven't counted down yet)
this.cancellationLock.release(consumer);
this.consumers.remove(consumer);
consumer = createBlockingQueueConsumer();
this.consumers.add(consumer);
} catch (RuntimeException e) {
logger.warn(
"Consumer failed irretrievably on restart. " + e.getClass() + ": " + e.getMessage());
// Re-throw and have it logged properly by the caller.
throw e;
}
this.taskExecutor.execute(new AsyncMessageProcessingConsumer(consumer));
}
}
}
private void restart(BlockingQueueConsumer consumer) {
synchronized (this.consumersMonitor) {
if (this.consumers != null) {
try {
// Need to recycle the channel in this consumer
consumer.stop();
// Ensure consumer counts are correct (another is going
// to start because of the exception, but
// we haven't counted down yet)
this.cancellationLock.release(consumer);
this.consumers.remove(consumer);
consumer = createBlockingQueueConsumer();
this.consumers.add(consumer);
} catch (RuntimeException e) {
logger.warn("Consumer died on restart. " + e.getClass() + ": " + e.getMessage());
// Thrown into the void (probably) in a background thread.
// Oh well, here goes...
throw e;
}
this.taskExecutor.execute(new AsyncMessageProcessingConsumer(consumer));
}
}
}
public void run() {
boolean aborted = false;
try {
try {
consumer.start();
start.countDown();
} catch (FatalListenerStartupException ex) {
throw ex;
} catch (Throwable t) {
start.countDown();
handleStartupFailure(t);
throw t;
}
// Always better to stop receiving as soon as possible if
// transactional
boolean continuable = false;
while (isActive() || continuable) {
try {
// Will come back false when the queue is drained
continuable = receiveAndExecute(consumer) && !isChannelTransacted();
} catch (ListenerExecutionFailedException ex) {
// Continue to process, otherwise re-throw
}
}
} catch (InterruptedException e) {
logger.debug("Consumer thread interrupted, processing stopped.");
Thread.currentThread().interrupt();
aborted = true;
} catch (FatalListenerStartupException ex) {
logger.error("Consumer received fatal exception on startup", ex);
this.startupException = ex;
// Fatal, but no point re-throwing, so just abort.
aborted = true;
} catch (FatalListenerExecutionException ex) {
logger.error("Consumer received fatal exception during processing", ex);
// Fatal, but no point re-throwing, so just abort.
aborted = true;
} catch (Throwable t) {
if (logger.isDebugEnabled()) {
logger.warn(
"Consumer raised exception, processing can restart if the connection factory supports it",
t);
} else {
logger.warn(
"Consumer raised exception, processing can restart if the connection factory supports it. "
+ "Exception summary: "
+ t);
}
}
// In all cases count down to allow container to progress beyond startup
start.countDown();
if (!isActive() || aborted) {
logger.debug("Cancelling " + consumer);
try {
consumer.stop();
} catch (AmqpException e) {
logger.info("Could not cancel message consumer", e);
}
if (aborted) {
logger.info("Stopping container from aborted consumer");
stop();
}
} else {
logger.info("Restarting " + consumer);
restart(consumer);
}
}
