final ProcessorExchangePair pair, final AsyncCallback callback, final AtomicInteger total) {
boolean sync = true;
final Exchange exchange = pair.getExchange();
Processor processor = pair.getProcessor();
Producer producer = pair.getProducer();
TracedRouteNodes traced = exchange.getUnitOfWork() != null ? exchange.getUnitOfWork().getTracedRouteNodes() : null;
// compute time taken if sending to another endpoint
StopWatch watch = null;
if (producer != null) {
watch = new StopWatch();
}
try {
// prepare tracing starting from a new block
if (traced != null) {
traced.pushBlock();
}
// let the prepared process it, remember to begin the exchange pair
AsyncProcessor async = AsyncProcessorConverterHelper.convert(processor);
pair.begin();
sync = AsyncProcessorHelper.process(async, exchange, new AsyncCallback() {
public void done(boolean doneSync) {
// we are done with the exchange pair
pair.done();
// we only have to handle async completion of the routing slip
if (doneSync) {
return;
}
// continue processing the multicast asynchronously
Exchange subExchange = exchange;
// Decide whether to continue with the multicast or not; similar logic to the Pipeline
// remember to test for stop on exception and aggregate before copying back results
boolean continueProcessing = PipelineHelper.continueProcessing(subExchange, "Sequential processing failed for number " + total.get(), LOG);
if (stopOnException && !continueProcessing) {
if (subExchange.getException() != null) {
// wrap in exception to explain where it failed
subExchange.setException(new CamelExchangeException("Sequential processing failed for number " + total, subExchange, subExchange.getException()));
} else {
// we want to stop on exception, and the exception was handled by the error handler
// this is similar to what the pipeline does, so we should do the same to not surprise end users
// so we should set the failed exchange as the result and be done
result.set(subExchange);
}
// and do the done work
doDone(original, subExchange, callback, false, true);
return;
}
try {
doAggregate(getAggregationStrategy(subExchange), result, subExchange);
} catch (Throwable e) {
// wrap in exception to explain where it failed
subExchange.setException(new CamelExchangeException("Sequential processing failed for number " + total, subExchange, e));
// and do the done work
doDone(original, subExchange, callback, false, true);
return;
}
total.incrementAndGet();
// maybe there are more processors to multicast
while (it.hasNext()) {
// prepare and run the next
ProcessorExchangePair pair = it.next();
subExchange = pair.getExchange();
updateNewExchange(subExchange, total.get(), pairs, it);
boolean sync = doProcessSequential(original, result, pairs, it, pair, callback, total);
if (!sync) {
LOG.trace("Processing exchangeId: {} is continued being processed asynchronously", original.getExchangeId());
return;
}
// Decide whether to continue with the multicast or not; similar logic to the Pipeline
// remember to test for stop on exception and aggregate before copying back results
continueProcessing = PipelineHelper.continueProcessing(subExchange, "Sequential processing failed for number " + total.get(), LOG);
if (stopOnException && !continueProcessing) {
if (subExchange.getException() != null) {
// wrap in exception to explain where it failed
subExchange.setException(new CamelExchangeException("Sequential processing failed for number " + total, subExchange, subExchange.getException()));
} else {
// we want to stop on exception, and the exception was handled by the error handler
// this is similar to what the pipeline does, so we should do the same to not surprise end users
// so we should set the failed exchange as the result and be done
result.set(subExchange);
}
// and do the done work
doDone(original, subExchange, callback, false, true);
return;
}
// must catch any exceptions from aggregation
try {
doAggregate(getAggregationStrategy(subExchange), result, subExchange);
} catch (Throwable e) {
// wrap in exception to explain where it failed
subExchange.setException(new CamelExchangeException("Sequential processing failed for number " + total, subExchange, e));
// and do the done work
doDone(original, subExchange, callback, false, true);
return;
}
total.incrementAndGet();
}
// do the done work
subExchange = result.get() != null ? result.get() : null;
doDone(original, subExchange, callback, false, true);
}
});
} finally {
// pop the block so by next round we have the same staring point and thus the tracing looks accurate
if (traced != null) {
traced.popBlock();
}
if (producer != null) {
long timeTaken = watch.stop();
Endpoint endpoint = producer.getEndpoint();
// emit event that the exchange was sent to the endpoint
EventHelper.notifyExchangeSent(exchange.getContext(), exchange, endpoint, timeTaken);
}
}