| /** |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.camel.processor.async; |
| |
| import java.util.concurrent.Callable; |
| import java.util.concurrent.ExecutorService; |
| import java.util.concurrent.Executors; |
| import java.util.concurrent.atomic.AtomicInteger; |
| |
| import org.apache.camel.AsyncCallback; |
| import org.apache.camel.CamelExchangeException; |
| import org.apache.camel.Exchange; |
| import org.apache.camel.impl.DefaultAsyncProducer; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * @version |
| */ |
| public class MyAsyncProducer extends DefaultAsyncProducer { |
| |
| private static final Logger LOG = LoggerFactory.getLogger(MyAsyncProducer.class); |
| private final ExecutorService executor; |
| private final AtomicInteger counter = new AtomicInteger(); |
| |
| public MyAsyncProducer(MyAsyncEndpoint endpoint) { |
| super(endpoint); |
| this.executor = endpoint.getCamelContext().getExecutorServiceStrategy().newCachedThreadPool(this, "MyProducer"); |
| } |
| |
| public MyAsyncEndpoint getEndpoint() { |
| return (MyAsyncEndpoint) super.getEndpoint(); |
| } |
| |
| public boolean process(final Exchange exchange, final AsyncCallback callback) { |
| executor.submit(new Callable<Object>() { |
| public Object call() throws Exception { |
| |
| LOG.info("Simulating a task which takes " + getEndpoint().getDelay() + " millis to reply"); |
| Thread.sleep(getEndpoint().getDelay()); |
| |
| int count = counter.incrementAndGet(); |
| if (getEndpoint().getFailFirstAttempts() >= count) { |
| LOG.info("Simulating a failure at attempt " + count); |
| exchange.setException(new CamelExchangeException("Simulated error at attempt " + count, exchange)); |
| } else { |
| String reply = getEndpoint().getReply(); |
| exchange.getOut().setBody(reply); |
| // propagate headers |
| exchange.getOut().setHeaders(exchange.getIn().getHeaders()); |
| LOG.info("Setting reply " + reply); |
| } |
| |
| LOG.info("Callback done(false)"); |
| callback.done(false); |
| return null; |
| } |
| }); |
| |
| // indicate from this point forward its being routed asynchronously |
| LOG.info("Task submitted, now tell Camel routing engine to that this Exchange is being continued asynchronously"); |
| return false; |
| } |
| |
| } |