final ProcessorExchangePair pair, final AsyncCallback callback, final AtomicInteger total) {
boolean sync = true;
final Exchange exchange = pair.getExchange();
Processor processor = pair.getProcessor();
final Producer producer = pair.getProducer();
TracedRouteNodes traced = exchange.getUnitOfWork() != null ? exchange.getUnitOfWork().getTracedRouteNodes() : null;
// compute time taken if sending to another endpoint
final StopWatch watch = producer != null ? new StopWatch() : null;
try {
// prepare tracing starting from a new block
if (traced != null) {
traced.pushBlock();
}
if (producer != null) {
EventHelper.notifyExchangeSending(exchange.getContext(), exchange, producer.getEndpoint());
}
// 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();
// okay we are done, so notify the exchange was sent
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);
}
// we only have to handle async completion of the routing slip