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.component.directvm;
018
019 import org.apache.camel.AsyncCallback;
020 import org.apache.camel.Exchange;
021 import org.apache.camel.Processor;
022 import org.apache.camel.processor.DelegateAsyncProcessor;
023 import org.apache.camel.util.ExchangeHelper;
024 import org.slf4j.Logger;
025 import org.slf4j.LoggerFactory;
026
027 /**
028 *
029 */
030 public final class DirectVmProcessor extends DelegateAsyncProcessor {
031
032 private static final Logger LOG = LoggerFactory.getLogger(DirectVmProcessor.class);
033 private final DirectVmEndpoint endpoint;
034
035 public DirectVmProcessor(Processor processor, DirectVmEndpoint endpoint) {
036 super(processor);
037 this.endpoint = endpoint;
038 }
039
040 @Override
041 public boolean process(final Exchange exchange, final AsyncCallback callback) {
042 // need to use a copy of the incoming exchange, so we route using this camel context
043 final Exchange copy = prepareExchange(exchange);
044
045 ClassLoader current = Thread.currentThread().getContextClassLoader();
046 boolean changed = false;
047 try {
048 // set TCCL to application context class loader if given
049 ClassLoader appClassLoader = endpoint.getCamelContext().getApplicationContextClassLoader();
050 if (appClassLoader != null) {
051 LOG.trace("Setting Thread ContextClassLoader to {}", appClassLoader);
052 Thread.currentThread().setContextClassLoader(appClassLoader);
053 changed = true;
054 }
055 return processor.process(copy, new AsyncCallback() {
056 @Override
057 public void done(boolean done) {
058 try {
059 // make sure to copy results back
060 ExchangeHelper.copyResults(exchange, copy);
061 } finally {
062 // must call callback when we are done
063 callback.done(done);
064 }
065 }
066 });
067 } finally {
068 // restore TCCL if it was changed during processing
069 if (changed) {
070 LOG.trace("Restoring Thread ContextClassLoader to {}", current);
071 Thread.currentThread().setContextClassLoader(current);
072 }
073 }
074 }
075
076 /**
077 * Strategy to prepare exchange for being processed by this consumer
078 *
079 * @param exchange the exchange
080 * @return the exchange to process by this consumer.
081 */
082 protected Exchange prepareExchange(Exchange exchange) {
083 // send a new copied exchange with new camel context (do not handover completions)
084 Exchange newExchange = ExchangeHelper.copyExchangeAndSetCamelContext(exchange, endpoint.getCamelContext(), false);
085 // set the from endpoint
086 newExchange.setFromEndpoint(endpoint);
087 return newExchange;
088 }
089
090 @Override
091 public String toString() {
092 return "DirectVm[" + processor + "]";
093 }
094 }