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.processor;
018    
019    import org.apache.camel.AsyncCallback;
020    import org.apache.camel.Exchange;
021    import org.apache.camel.Processor;
022    import org.apache.camel.spi.RouteContext;
023    import org.apache.camel.spi.UnitOfWork;
024    
025    /**
026     * This processor tracks the current {@link RouteContext} while processing the {@link Exchange}.
027     * This ensures that the {@link Exchange} have details under which route its being currently processed.
028     */
029    public class RouteContextProcessor extends DelegateAsyncProcessor {
030        
031        private final RouteContext routeContext;
032    
033        public RouteContextProcessor(RouteContext routeContext, Processor processor) {
034            super(processor);
035            this.routeContext = routeContext;
036        }
037    
038        @Override
039        protected boolean processNext(final Exchange exchange, final AsyncCallback callback) {
040            // push the current route context
041            if (exchange.getUnitOfWork() != null) {
042                exchange.getUnitOfWork().pushRouteContext(routeContext);
043            }
044    
045            boolean sync = processor.process(exchange, new AsyncCallback() {
046                public void done(boolean doneSync) {
047                    try {
048                        UnitOfWork uow = exchange.getUnitOfWork();
049                        // pop the route context we just used
050                        if (uow != null) {
051                            uow.popRouteContext();
052                        }
053                    } catch (Exception e) {
054                        exchange.setException(e);
055                    } finally {
056                        callback.done(doneSync);
057                    }
058                }
059            });
060    
061            return sync;
062        }
063    
064        @Override
065        public String toString() {
066            return "RouteContextProcessor[" + processor + "]";
067        }
068    
069    }