Examples with AsyncProcessor org.apache.camel.AsyncProcessor used on opensource projects

Example 1 with AsyncProcessor

use of org.apache.camel.AsyncProcessor in project camel by apache.

the class ProducerCache method doInAsyncProducer.

/**
     * Sends an exchange to an endpoint using a supplied callback supporting the asynchronous routing engine.
     * <p/>
     * If an exception was thrown during processing, it would be set on the given Exchange
     *
     * @param endpoint         the endpoint to send the exchange to
     * @param exchange         the exchange, can be <tt>null</tt> if so then create a new exchange from the producer
     * @param pattern          the exchange pattern, can be <tt>null</tt>
     * @param callback         the asynchronous callback
     * @param producerCallback the producer template callback to be executed
     * @return (doneSync) <tt>true</tt> to continue execute synchronously, <tt>false</tt> to continue being executed asynchronously
     */
public boolean doInAsyncProducer(final Endpoint endpoint, final Exchange exchange, final ExchangePattern pattern, final AsyncCallback callback, final AsyncProducerCallback producerCallback) {
    Producer target;
    try {
        // get the producer and we do not mind if its pooled as we can handle returning it back to the pool
        target = doGetProducer(endpoint, true);
        if (target == null) {
            if (isStopped()) {
                LOG.warn("Ignoring exchange sent after processor is stopped: " + exchange);
                callback.done(true);
                return true;
            } else {
                exchange.setException(new IllegalStateException("No producer, this processor has not been started: " + this));
                callback.done(true);
                return true;
            }
        }
    } catch (Throwable e) {
        exchange.setException(e);
        callback.done(true);
        return true;
    }
    final Producer producer = target;
    // record timing for sending the exchange using the producer
    final StopWatch watch = eventNotifierEnabled && exchange != null ? new StopWatch() : null;
    try {
        if (eventNotifierEnabled && exchange != null) {
            EventHelper.notifyExchangeSending(exchange.getContext(), exchange, endpoint);
        }
        // invoke the callback
        AsyncProcessor asyncProcessor = AsyncProcessorConverterHelper.convert(producer);
        return producerCallback.doInAsyncProducer(producer, asyncProcessor, exchange, pattern, doneSync -> {
            try {
                if (eventNotifierEnabled && watch != null) {
                    long timeTaken = watch.stop();
                    EventHelper.notifyExchangeSent(exchange.getContext(), exchange, endpoint, timeTaken);
                }
                if (producer instanceof ServicePoolAware) {
                    pool.release(endpoint, producer);
                } else if (!producer.isSingleton()) {
                    try {
                        ServiceHelper.stopAndShutdownService(producer);
                    } catch (Exception e) {
                        LOG.warn("Error stopping/shutting down producer: " + producer, e);
                    }
                }
            } finally {
                callback.done(doneSync);
            }
        });
    } catch (Throwable e) {
        // ensure exceptions is caught and set on the exchange
        if (exchange != null) {
            exchange.setException(e);
        }
        callback.done(true);
        return true;
    }
}

Example 2 with AsyncProcessor

use of org.apache.camel.AsyncProcessor in project camel by apache.

the class ProducerCache method asyncSendExchange.

/**
     * Asynchronously sends an exchange to an endpoint using a supplied
     * {@link Processor} to populate the exchange
     * <p>
     * This method will <b>neither</b> throw an exception <b>nor</b> complete future exceptionally.
     * If processing of the given Exchange failed then the exception is stored on the return Exchange
     *
     * @param endpoint        the endpoint to send the exchange to
     * @param pattern         the message {@link ExchangePattern} such as
     *                        {@link ExchangePattern#InOnly} or {@link ExchangePattern#InOut}
     * @param processor       the transformer used to populate the new exchange
     * @param resultProcessor a processor to process the exchange when the send is complete.
     * @param exchange        an exchange to use in processing. Exchange will be created if parameter is null.
     * @param future          the preexisting future to complete when processing is done or null if to create new one
     * @return future that completes with exchange when processing is done. Either passed into future parameter
     *              or new one if parameter was null
     */
public CompletableFuture<Exchange> asyncSendExchange(final Endpoint endpoint, ExchangePattern pattern, final Processor processor, final Processor resultProcessor, Exchange exchange, CompletableFuture<Exchange> future) {
    AsyncCallbackToCompletableFutureAdapter<Exchange> futureAdapter = new AsyncCallbackToCompletableFutureAdapter<>(future, exchange);
    doInAsyncProducer(endpoint, exchange, pattern, futureAdapter, (producer, asyncProducer, innerExchange, exchangePattern, producerCallback) -> {
        if (innerExchange == null) {
            innerExchange = pattern != null ? producer.getEndpoint().createExchange(pattern) : producer.getEndpoint().createExchange();
            futureAdapter.setResult(innerExchange);
        }
        if (processor != null) {
            // lets populate using the processor callback
            AsyncProcessor asyncProcessor = AsyncProcessorConverterHelper.convert(processor);
            try {
                final Exchange finalExchange = innerExchange;
                asyncProcessor.process(innerExchange, doneSync -> asyncDispatchExchange(endpoint, producer, resultProcessor, finalExchange, producerCallback));
                return false;
            } catch (Exception e) {
                // populate failed so return
                innerExchange.setException(e);
                producerCallback.done(true);
                return true;
            }
        }
        return asyncDispatchExchange(endpoint, producer, resultProcessor, innerExchange, producerCallback);
    });
    return futureAdapter.getFuture();
}

Example 3 with AsyncProcessor

use of org.apache.camel.AsyncProcessor in project camel by apache.

the class MulticastProcessor method doProcessParallel.

private void doProcessParallel(final ProcessorExchangePair pair) throws Exception {
    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();
        }
        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();
        // we invoke it synchronously as parallel async routing is too hard
        AsyncProcessorHelper.process(async, exchange);
    } finally {
        pair.done();
        // 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
            // this is okay to do here in the finally block, as the processing is not using the async routing engine
            //( we invoke it synchronously as parallel async routing is too hard)
            EventHelper.notifyExchangeSent(exchange.getContext(), exchange, endpoint, timeTaken);
        }
    }
}

Example 4 with AsyncProcessor

use of org.apache.camel.AsyncProcessor in project camel by apache.

the class ChoiceProcessor method process.

public boolean process(final Exchange exchange, final AsyncCallback callback) {
    Iterator<Processor> processors = next().iterator();
    // callback to restore existing FILTER_MATCHED property on the Exchange
    final Object existing = exchange.getProperty(Exchange.FILTER_MATCHED);
    final AsyncCallback choiceCallback = new AsyncCallback() {

        @Override
        public void done(boolean doneSync) {
            if (existing != null) {
                exchange.setProperty(Exchange.FILTER_MATCHED, existing);
            } else {
                exchange.removeProperty(Exchange.FILTER_MATCHED);
            }
            callback.done(doneSync);
        }
    };
    // and if not, we just continue without using any processor
    while (processors.hasNext()) {
        // get the next processor
        Processor processor = processors.next();
        // evaluate the predicate on filter predicate early to be faster
        // and avoid issues when having nested choices
        // as we should only pick one processor
        boolean matches = false;
        if (processor instanceof FilterProcessor) {
            FilterProcessor filter = (FilterProcessor) processor;
            try {
                matches = filter.matches(exchange);
                // as we have pre evaluated the predicate then use its processor directly when routing
                processor = filter.getProcessor();
            } catch (Throwable e) {
                exchange.setException(e);
            }
        } else {
            // its the otherwise processor, so its a match
            notFiltered++;
            matches = true;
        }
        // check for error if so we should break out
        if (!continueProcessing(exchange, "so breaking out of choice", LOG)) {
            break;
        }
        // if we did not match then continue to next filter
        if (!matches) {
            continue;
        }
        // okay we found a filter or its the otherwise we are processing
        AsyncProcessor async = AsyncProcessorConverterHelper.convert(processor);
        return async.process(exchange, choiceCallback);
    }
    // when no filter matches and there is no otherwise, then just continue
    choiceCallback.done(true);
    return true;
}

Example 5 with AsyncProcessor

use of org.apache.camel.AsyncProcessor in project camel by apache.

the class ProcessDefinition method createProcessor.

@Override
public Processor createProcessor(RouteContext routeContext) {
    Processor answer = processor;
    if (processor == null) {
        ObjectHelper.notNull(ref, "ref", this);
        answer = routeContext.mandatoryLookup(getRef(), Processor.class);
    }
    // (a Processor must be a Service to be enlisted in JMX)
    if (!(answer instanceof Service)) {
        if (answer instanceof AsyncProcessor) {
            // the processor is async by nature so use the async delegate
            answer = new DelegateAsyncProcessor(answer);
        } else {
            // the processor is sync by nature so use the sync delegate
            answer = new DelegateSyncProcessor(answer);
        }
    }
    return answer;
}