Package org.apache.camel.processor

Source Code of org.apache.camel.processor.UnitOfWorkProcessor

/**
* 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 org.apache.camel.AsyncCallback;
import org.apache.camel.AsyncProcessor;
import org.apache.camel.Exchange;
import org.apache.camel.impl.DefaultUnitOfWork;
import static org.apache.camel.util.ObjectHelper.wrapRuntimeCamelException;

/**
* Handles calling the UnitOfWork.done() method when processing of an exchange
* is complete.
*/
public final class UnitOfWorkProcessor extends DelegateAsyncProcessor {

    public UnitOfWorkProcessor(AsyncProcessor processor) {
        super(processor);
    }
   
    public boolean process(final Exchange exchange, final AsyncCallback callback) {
        if (exchange.getUnitOfWork() == null) {
            // If there is no existing UoW, then we should start one and
            // terminate it once processing is completed for the exchange.
            final DefaultUnitOfWork uow = new DefaultUnitOfWork();
            exchange.setUnitOfWork(uow);
            try {
                uow.start();
            } catch (Exception e) {
                throw wrapRuntimeCamelException(e);
            }
            // return the process code where we do stop and cleanup
            return processor.process(exchange, new AsyncCallback() {
                public void done(boolean sync) {
                    // Order here matters. We need to complete the callbacks
                    // since they will likely update the exchange with
                    // some final results.
                    callback.done(sync);
                    exchange.getUnitOfWork().done(exchange);
                    try {
                        uow.stop();
                    } catch (Exception e) {
                        throw wrapRuntimeCamelException(e);
                    }
                    exchange.setUnitOfWork(null);
                }
            });
        } else {
            // There was an existing UoW, so we should just pass through..
            // so that the guy the initiated the UoW can terminate it.
            return processor.process(exchange, callback);
        }
    }

}
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