| /** |
| * 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; |
| |
| import java.util.concurrent.ExecutorService; |
| import java.util.concurrent.RejectedExecutionException; |
| import java.util.concurrent.atomic.AtomicBoolean; |
| |
| import org.apache.camel.AsyncCallback; |
| import org.apache.camel.AsyncProcessor; |
| import org.apache.camel.CamelContext; |
| import org.apache.camel.Exchange; |
| import org.apache.camel.impl.ServiceSupport; |
| import org.apache.camel.util.AsyncProcessorHelper; |
| import org.apache.camel.util.ObjectHelper; |
| |
| /** |
| * Threads processor that leverage a thread pool for continue processing the {@link Exchange}s |
| * using the asynchronous routing engine. |
| * |
| * @version |
| */ |
| public class ThreadsProcessor extends ServiceSupport implements AsyncProcessor { |
| |
| private final ExecutorService executorService; |
| private final AtomicBoolean shutdown = new AtomicBoolean(true); |
| private boolean callerRunsWhenRejected = true; |
| |
| private final class ProcessCall implements Runnable { |
| private final Exchange exchange; |
| private final AsyncCallback callback; |
| |
| public ProcessCall(Exchange exchange, AsyncCallback callback) { |
| this.exchange = exchange; |
| this.callback = callback; |
| } |
| |
| public void run() { |
| if (shutdown.get()) { |
| exchange.setException(new RejectedExecutionException("ThreadsProcessor is not running.")); |
| } |
| callback.done(false); |
| } |
| } |
| |
| public ThreadsProcessor(CamelContext camelContext, ExecutorService executorService) { |
| ObjectHelper.notNull(camelContext, "camelContext"); |
| ObjectHelper.notNull(executorService, "executorService"); |
| this.executorService = executorService; |
| } |
| |
| public void process(final Exchange exchange) throws Exception { |
| AsyncProcessorHelper.process(this, exchange); |
| } |
| |
| public boolean process(Exchange exchange, AsyncCallback callback) { |
| if (shutdown.get()) { |
| throw new IllegalStateException("ThreadsProcessor is not running."); |
| } |
| |
| ProcessCall call = new ProcessCall(exchange, callback); |
| try { |
| executorService.submit(call); |
| // tell Camel routing engine we continue routing asynchronous |
| return false; |
| } catch (RejectedExecutionException e) { |
| if (isCallerRunsWhenRejected()) { |
| if (shutdown.get()) { |
| exchange.setException(new RejectedExecutionException()); |
| } else { |
| callback.done(true); |
| } |
| } else { |
| exchange.setException(e); |
| } |
| return true; |
| } |
| } |
| |
| public boolean isCallerRunsWhenRejected() { |
| return callerRunsWhenRejected; |
| } |
| |
| public void setCallerRunsWhenRejected(boolean callerRunsWhenRejected) { |
| this.callerRunsWhenRejected = callerRunsWhenRejected; |
| } |
| |
| public String toString() { |
| return "Threads"; |
| } |
| |
| protected void doStart() throws Exception { |
| shutdown.set(false); |
| } |
| |
| protected void doStop() throws Exception { |
| shutdown.set(true); |
| } |
| } |