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.management;
018    
019    import org.apache.camel.AsyncCallback;
020    import org.apache.camel.AsyncProcessor;
021    import org.apache.camel.Exchange;
022    import org.apache.camel.processor.DelegateProcessor;
023    import org.apache.camel.util.AsyncProcessorHelper;
024    import org.apache.commons.logging.Log;
025    import org.apache.commons.logging.LogFactory;
026    
027    /**
028     * JMX enabled processor that uses the {@link Counter} for instrumenting
029     * processing of exchanges.
030     *
031     * @version $Revision: 699782 $
032     */
033    public class InstrumentationProcessor extends DelegateProcessor implements AsyncProcessor {
034    
035        private static final transient Log LOG = LogFactory.getLog(InstrumentationProcessor.class);
036        private PerformanceCounter counter;
037    
038        public InstrumentationProcessor(PerformanceCounter counter) {
039            this.counter = counter;
040        }
041    
042        public InstrumentationProcessor() {
043        }
044    
045        public void setCounter(PerformanceCounter counter) {
046            this.counter = counter;
047        }
048    
049        public void process(Exchange exchange) throws Exception {
050            AsyncProcessorHelper.process(this, exchange);
051        }
052    
053        public boolean process(final Exchange exchange, final AsyncCallback callback) {
054            if (processor == null) {
055                // no processor so nothing to process, so return
056                callback.done(true);
057                return true;
058            }
059    
060            final long startTime = System.nanoTime();
061    
062            if (processor instanceof AsyncProcessor) {
063                return ((AsyncProcessor)processor).process(exchange, new AsyncCallback() {
064                    public void done(boolean doneSynchronously) {
065                        if (counter != null) {
066                            // convert nanoseconds to milliseconds
067                            recordTime(exchange, (System.nanoTime() - startTime) / 1000000.0);
068                        }
069                        callback.done(doneSynchronously);
070                    }
071                });
072            }
073    
074            try {
075                processor.process(exchange);
076            } catch (Throwable e) {
077                exchange.setException(e);
078            }
079    
080            if (counter != null) {
081                // convert nanoseconds to milliseconds
082                recordTime(exchange, (System.nanoTime() - startTime) / 1000000.0);
083            }
084            callback.done(true);
085            return true;
086        }
087    
088        protected void recordTime(Exchange exchange, double duration) {
089            if (LOG.isTraceEnabled()) {
090                LOG.trace("Recording duration: " + duration + " millis for exchange: " + exchange);
091            }
092    
093            if (!exchange.isFailed() && exchange.getException() == null) {
094                counter.completedExchange(duration);
095            } else {
096                counter.failedExchange();
097            }
098        }
099    
100    }