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 }