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: 1540 $
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        @Override
046        public String toString() {
047            return "Instrumentation(" + processor + ")";
048        }
049    
050        public void setCounter(PerformanceCounter counter) {
051            this.counter = counter;
052        }
053    
054        public void process(Exchange exchange) throws Exception {
055            AsyncProcessorHelper.process(this, exchange);
056        }
057    
058        public boolean process(final Exchange exchange, final AsyncCallback callback) {
059            if (processor == null) {
060                // no processor so nothing to process, so return
061                callback.done(true);
062                return true;
063            }
064    
065            final long startTime = System.nanoTime();
066    
067            if (processor instanceof AsyncProcessor) {
068                return ((AsyncProcessor)processor).process(exchange, new AsyncCallback() {
069                    public void done(boolean doneSynchronously) {
070                        if (counter != null) {
071                            // convert nanoseconds to milliseconds
072                            recordTime(exchange, (System.nanoTime() - startTime) / 1000000.0);
073                        }
074                        callback.done(doneSynchronously);
075                    }
076                });
077            }
078    
079            try {
080                processor.process(exchange);
081            } catch (Throwable e) {
082                exchange.setException(e);
083            }
084    
085            if (counter != null) {
086                // convert nanoseconds to milliseconds
087                recordTime(exchange, (System.nanoTime() - startTime) / 1000000.0);
088            }
089            callback.done(true);
090            return true;
091        }
092    
093        protected void recordTime(Exchange exchange, double duration) {
094            if (LOG.isTraceEnabled()) {
095                LOG.trace("Recording duration: " + duration + " millis for exchange: " + exchange);
096            }
097    
098            if (!exchange.isFailed() && exchange.getException() == null) {
099                counter.completedExchange(duration);
100            } else {
101                counter.failedExchange();
102            }
103        }
104    
105    }