001 /**
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements. See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License. You may obtain a copy of the License at
008 *
009 * http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017 package org.apache.camel.util;
018
019 import java.util.concurrent.CountDownLatch;
020
021 import org.apache.camel.AsyncCallback;
022 import org.apache.camel.AsyncProcessor;
023 import org.apache.camel.Exchange;
024
025 /**
026 * Helper methods for AsyncProcessor objects.
027 */
028 public final class AsyncProcessorHelper {
029
030 private AsyncProcessorHelper() {
031 // utility class
032 }
033
034 /**
035 * Calls the async version of the processor's process method and waits
036 * for it to complete before returning. This can be used by AsyncProcessor
037 * objects to implement their sync version of the process method.
038 */
039 public static void process(AsyncProcessor processor, Exchange exchange) throws Exception {
040 final CountDownLatch latch = new CountDownLatch(1);
041 boolean sync = processor.process(exchange, new AsyncCallback() {
042 public void done(boolean sync) {
043 if (!sync) {
044 latch.countDown();
045 }
046 }
047 });
048 if (!sync) {
049 latch.await();
050 }
051 }
052 }