Java AsyncProcessor类代码示例

import org.apache.camel.AsyncProcessor; //导入依赖的package包/类
/**
 * Calls the async version of the processor's process method and waits
 * for it to complete before returning. This can be used by {@link AsyncProcessor}
 * objects to implement their sync version of the process method.
 * <p/>
 * <b>Important:</b> This method is discouraged to be used, as its better to invoke the asynchronous
 * {@link AsyncProcessor#process(org.apache.camel.Exchange, org.apache.camel.AsyncCallback)} method, whenever possible.
 *
 * @param processor the processor
 * @param exchange  the exchange
 * @throws Exception can be thrown if waiting is interrupted
 */
public static void process(final AsyncProcessor processor, final Exchange exchange) throws Exception {
    final AsyncProcessorAwaitManager awaitManager = exchange.getContext().getAsyncProcessorAwaitManager();

    final CountDownLatch latch = new CountDownLatch(1);
    boolean sync = processor.process(exchange, new AsyncCallback() {
        public void done(boolean doneSync) {
            if (!doneSync) {
                awaitManager.countDown(exchange, latch);
            }
        }

        @Override
        public String toString() {
            return "Done " + processor;
        }
    });
    if (!sync) {
        awaitManager.await(exchange, latch);
    }
}
 

import org.apache.camel.AsyncProcessor; //导入依赖的package包/类
@Override
public boolean process(Exchange exchange, AsyncCallback callback) {
    if (delegate == null) {
        exchange.setException(new IllegalStateException("Not started"));
        callback.done(true);
        return true;
    }

    if (delegate instanceof AsyncProcessor) {
        return ((AsyncProcessor) delegate).process(exchange, callback);
    }

    // fallback to sync mode
    try {
        process(exchange);
    } catch (Exception e) {
        exchange.setException(e);
    }

    callback.done(true);
    return true;
}
 

import org.apache.camel.AsyncProcessor; //导入依赖的package包/类
public boolean process(Exchange exchange, final AsyncCallback callback) {
    boolean flag = true;
    
    if ((((RouteboxDirectEndpoint)getRouteboxEndpoint()).getConsumer() == null) 
        && ((getRouteboxEndpoint()).getConfig().isSendToConsumer())) {
        exchange.setException(new CamelExchangeException("No consumers available on endpoint: " + getRouteboxEndpoint(), exchange));
        callback.done(true);
        flag = true;
    } else {
        try {
            LOG.debug("Dispatching to Inner Route {}", exchange);
            
            RouteboxDispatcher dispatcher = new RouteboxDispatcher(producer);
            exchange = dispatcher.dispatchAsync(getRouteboxEndpoint(), exchange);      
            if (getRouteboxEndpoint().getConfig().isSendToConsumer()) {
                AsyncProcessor processor = ((RouteboxDirectEndpoint)getRouteboxEndpoint()).getConsumer().getAsyncProcessor();
                flag = processor.process(exchange, callback);
            } 
        } catch (Exception e) {
            getExceptionHandler().handleException("Error processing exchange", exchange, e);
        }
    }
    return flag;
}
 

import org.apache.camel.AsyncProcessor; //导入依赖的package包/类
private boolean processExchange(final Exchange exchange) throws Exception {

        taskProcessor.process(exchange);
        final Processor currentProcessor = getProcessor();
        if (currentProcessor instanceof AsyncProcessor) {
            ((AsyncProcessor) currentProcessor).process(exchange, new AsyncCallback() {
                @Override
                public void done(boolean doneSync) {
                    // we are not interested in this event
                }
            });
        } else {
            currentProcessor.process(exchange);
        }

        return true;

    }
 

import org.apache.camel.AsyncProcessor; //导入依赖的package包/类
public boolean process(Exchange exchange, AsyncCallback callback) {
    Iterator<Processor> processors = next().iterator();

    Object lastHandled = exchange.getProperty(Exchange.EXCEPTION_HANDLED);
    exchange.setProperty(Exchange.EXCEPTION_HANDLED, null);

    while (continueRouting(processors, exchange)) {
        exchange.setProperty(Exchange.TRY_ROUTE_BLOCK, true);
        ExchangeHelper.prepareOutToIn(exchange);

        // process the next processor
        Processor processor = processors.next();
        AsyncProcessor async = AsyncProcessorConverterHelper.convert(processor);
        boolean sync = process(exchange, callback, processors, async, lastHandled);

        // continue as long its being processed synchronously
        if (!sync) {
            LOG.trace("Processing exchangeId: {} is continued being processed asynchronously", exchange.getExchangeId());
            // the remainder of the try .. catch .. finally 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", exchange.getExchangeId());
    }

    ExchangeHelper.prepareOutToIn(exchange);
    exchange.removeProperty(Exchange.TRY_ROUTE_BLOCK);
    exchange.setProperty(Exchange.EXCEPTION_HANDLED, lastHandled);
    LOG.trace("Processing complete for exchangeId: {} >>> {}", exchange.getExchangeId(), exchange);
    callback.done(true);
    return true;
}
 

import org.apache.camel.AsyncProcessor; //导入依赖的package包/类
private RestBindingMarshalOnCompletion(String routeId, AsyncProcessor jsonMarshal, AsyncProcessor xmlMarshal, boolean wasXml, String accept) {
    this.routeId = routeId;
    this.jsonMarshal = jsonMarshal;
    this.xmlMarshal = xmlMarshal;
    this.wasXml = wasXml;
    this.accept = accept;
}
 

import org.apache.camel.AsyncProcessor; //导入依赖的package包/类
private boolean processExchange(Processor processor, Exchange exchange, Exchange copy,
                                AtomicInteger attempts, AtomicInteger index,
                                AsyncCallback callback, List<Processor> processors) {
    if (processor == null) {
        throw new IllegalStateException("No processors could be chosen to process " + copy);
    }
    log.debug("Processing failover at attempt {} for {}", attempts, copy);

    AsyncProcessor albp = AsyncProcessorConverterHelper.convert(processor);
    return albp.process(copy, new FailOverAsyncCallback(exchange, copy, attempts, index, callback, processors));
}
 

import org.apache.camel.AsyncProcessor; //导入依赖的package包/类
private boolean executeProcessor(final Exchange exchange, final AsyncCallback callback) {
    Processor processor = getProcessors().get(0);
    if (processor == null) {
        throw new IllegalStateException("No processors could be chosen to process CircuitBreaker");
    }

    // store state as exchange property
    exchange.setProperty(Exchange.CIRCUIT_BREAKER_STATE, stateAsString(state.get()));

    AsyncProcessor albp = AsyncProcessorConverterHelper.convert(processor);
    // Added a callback for processing the exchange in the callback
    boolean sync = albp.process(exchange, new CircuitBreakerCallback(exchange, callback));

    // We need to check the exception here as albp is use sync call
    if (sync) {
        boolean failed = hasFailed(exchange);
        if (!failed) {
            failures.set(0);
        } else {
            failures.incrementAndGet();
            lastFailure = System.currentTimeMillis();
        }
    } else {
        // CircuitBreakerCallback can take care of failure check of the
        // exchange
        log.trace("Processing exchangeId: {} is continued being processed asynchronously", exchange.getExchangeId());
        return false;
    }

    log.trace("Processing exchangeId: {} is continued being processed synchronously", exchange.getExchangeId());
    callback.done(true);
    return true;
}
 

import org.apache.camel.AsyncProcessor; //导入依赖的package包/类
@Override
public <T> T convertTo(Class<T> type, Exchange exchange, Object value) {
    if (type.equals(AsyncProcessor.class)) {
        if (value instanceof Processor) {
            return type.cast(AsyncProcessorConverterHelper.convert((Processor) value));
        }
    }
    return null;
}
 

import org.apache.camel.AsyncProcessor; //导入依赖的package包/类
/**
 * Provides an {@link org.apache.camel.AsyncProcessor} interface to the configured
 * processor on the consumer. If the processor does not implement the interface,
 * it will be adapted so that it does.
 */
public synchronized AsyncProcessor getAsyncProcessor() {
    if (asyncProcessor == null) {            
        asyncProcessor = AsyncProcessorConverterHelper.convert(processor);
    }
    return asyncProcessor;
}
 

import org.apache.camel.AsyncProcessor; //导入依赖的package包/类
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);
        }
    };

    // as we only pick one processor to process, then no need to have async callback that has a while loop as well
    // as this should not happen, eg we pick the first filter processor that matches, or the otherwise (if present)
    // 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;
}
 

import org.apache.camel.AsyncProcessor; //导入依赖的package包/类
public DelegateAsyncProcessor(AsyncProcessor processor) {
    if (processor == this) {
        throw new IllegalArgumentException("Recursive DelegateAsyncProcessor!");
    }
    this.processor = processor;
}
 

import org.apache.camel.AsyncProcessor; //导入依赖的package包/类
public AsyncProcessor getProcessor() {
    return processor;
}
 

import org.apache.camel.AsyncProcessor; //导入依赖的package包/类
public void setProcessor(AsyncProcessor processor) {
    this.processor = processor;
}
 

import org.apache.camel.AsyncProcessor; //导入依赖的package包/类
public boolean process(Exchange exchange, AsyncCallback callback) {
    Iterator<Processor> processors = getProcessors().iterator();
    Exchange nextExchange = exchange;
    boolean first = true;

    while (continueRouting(processors, nextExchange)) {
        if (first) {
            first = false;
        } else {
            // prepare for next run
            nextExchange = createNextExchange(nextExchange);
        }

        // get the next processor
        Processor processor = processors.next();

        AsyncProcessor async = AsyncProcessorConverterHelper.convert(processor);
        boolean sync = process(exchange, nextExchange, callback, processors, async);

        // continue as long its being processed synchronously
        if (!sync) {
            LOG.trace("Processing exchangeId: {} is continued being processed asynchronously", exchange.getExchangeId());
            // the remainder of the pipeline 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", exchange.getExchangeId());

        // check for error if so we should break out
        if (!continueProcessing(nextExchange, "so breaking out of pipeline", LOG)) {
            break;
        }
    }

    // logging nextExchange as it contains the exchange that might have altered the payload and since
    // we are logging the completion if will be confusing if we log the original instead
    // we could also consider logging the original and the nextExchange then we have *before* and *after* snapshots
    LOG.trace("Processing complete for exchangeId: {} >>> {}", exchange.getExchangeId(), nextExchange);

    // copy results back to the original exchange
    ExchangeHelper.copyResults(exchange, nextExchange);

    callback.done(true);
    return true;
}