@Override
public boolean process(Exchange exchange, AsyncCallback callback) {
// use atomic integer to be able to pass reference and keep track on the values
AtomicInteger index = new AtomicInteger();
AtomicInteger count = new AtomicInteger();
// Intermediate conversion to String is needed when direct conversion to Integer is not
// available
// but evaluation result is a textual representation of a numeric value.
String text = expression.evaluate(exchange, String.class);
try {
int num = ExchangeHelper.convertToMandatoryType(exchange, Integer.class, text);
count.set(num);
} catch (NoTypeConversionAvailableException e) {
exchange.setException(e);
callback.done(true);
return true;
}
// we hold on to the original Exchange in case it's needed for copies
final Exchange original = exchange;
// per-iteration exchange
Exchange target = exchange;
// set the size before we start
exchange.setProperty(Exchange.LOOP_SIZE, count);
// loop synchronously
while (index.get() < count.get()) {
// and prepare for next iteration
// if (!copy) target = exchange; else copy of original
target = prepareExchange(exchange, index.get(), original);
boolean sync = process(target, callback, index, count, original);
if (!sync) {
LOG.trace(
"Processing exchangeId: {} is continued being processed asynchronously",
target.getExchangeId());
// the remainder of the routing slip will be completed async
// so we break out now, then the callback will be invoked which then continue routing from
// where we left here
return false;
}
LOG.trace(
"Processing exchangeId: {} is continued being processed synchronously",
target.getExchangeId());
// increment counter before next loop
index.getAndIncrement();
}
// we are done so prepare the result
ExchangeHelper.copyResults(exchange, target);
LOG.trace("Processing complete for exchangeId: {} >>> {}", exchange.getExchangeId(), exchange);
callback.done(true);
return true;
}
@SuppressWarnings("ThrowableResultOfMethodCallIgnored")
@Override
public void process(Exchange exchange) throws Exception {
if (exchange.getIn().getBody() instanceof InputStream) {
exchange.getIn().setBody(exchange.getContext().getStreamCachingStrategy().cache(exchange));
}
Exchange tempExchange = exchange.copy(true);
try {
for (int retry = 0; retry < endpoint.getMaxTries(); ++retry) {
if (endpoint.getRetryDelay() > 0 && retry > 0) {
Thread.sleep(endpoint.getRetryDelay());
}
endpoint.getTargetProducer().process(tempExchange);
if (tempExchange.getException() == null) {
onSuccess(tempExchange);
return; // success
}
FailRetryException failure =
getExceptionMatching(tempExchange.getException(), FailRetryException.class);
if (failure != null) {
if (!failure.isConsumed()) {
failure.setConsumed(); // make it non-failure for surrounding retries
return; // forward exception
}
}
if (getExceptionMatching(tempExchange.getException(), endpoint.getException()) != null) {
// retry
LOGGER.debug("{} try {} failed", endpoint.getEndpointUri(), retry + 1);
tempExchange = exchange.copy(true);
if (exchange.getIn().getBody() instanceof StreamCache) {
StreamCache is = (StreamCache) exchange.getIn().getBody();
is.reset();
}
} else {
return; // forward exception
}
}
onExhausted(exchange);
tempExchange.setException(
new RetryExhaustedException("Retry exhausted", tempExchange.getException()));
} finally {
ExchangeHelper.copyResults(exchange, tempExchange);
}
}
/**
* Common work which must be done when we are done multicasting.
*
* <p>This logic applies for both running synchronous and asynchronous as there are multiple exist
* points when using the asynchronous routing engine. And therefore we want the logic in one
* method instead of being scattered.
*
* @param original the original exchange
* @param subExchange the current sub exchange, can be <tt>null</tt> for the synchronous part
* @param pairs the pairs with the exchanges to process
* @param callback the callback
* @param doneSync the <tt>doneSync</tt> parameter to call on callback
* @param forceExhaust whether or not error handling is exhausted
*/
protected void doDone(
Exchange original,
Exchange subExchange,
final Iterable<ProcessorExchangePair> pairs,
AsyncCallback callback,
boolean doneSync,
boolean forceExhaust) {
// we are done so close the pairs iterator
if (pairs != null && pairs instanceof Closeable) {
IOHelper.close((Closeable) pairs, "pairs", LOG);
}
AggregationStrategy strategy = getAggregationStrategy(subExchange);
// invoke the on completion callback
if (strategy instanceof CompletionAwareAggregationStrategy) {
((CompletionAwareAggregationStrategy) strategy).onCompletion(subExchange);
}
// cleanup any per exchange aggregation strategy
removeAggregationStrategyFromExchange(original);
// we need to know if there was an exception, and if the stopOnException option was enabled
// also we would need to know if any error handler has attempted redelivery and exhausted
boolean stoppedOnException = false;
boolean exception = false;
boolean exhaust =
forceExhaust
|| subExchange != null
&& (subExchange.getException() != null
|| ExchangeHelper.isRedeliveryExhausted(subExchange));
if (original.getException() != null
|| subExchange != null && subExchange.getException() != null) {
// there was an exception and we stopped
stoppedOnException = isStopOnException();
exception = true;
}
// must copy results at this point
if (subExchange != null) {
if (stoppedOnException) {
// if we stopped due an exception then only propagte the exception
original.setException(subExchange.getException());
} else {
// copy the current result to original so it will contain this result of this eip
ExchangeHelper.copyResults(original, subExchange);
}
}
// .. and then if there was an exception we need to configure the redelivery exhaust
// for example the noErrorHandler will not cause redelivery exhaust so if this error
// handled has been in use, then the exhaust would be false (if not forced)
if (exception) {
// multicast uses error handling on its output processors and they have tried to redeliver
// so we shall signal back to the other error handlers that we are exhausted and they should
// not
// also try to redeliver as we will then do that twice
original.setProperty(Exchange.REDELIVERY_EXHAUSTED, exhaust);
}
callback.done(doneSync);
}
