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 java.util.Map;
020
021 import org.apache.camel.Processor;
022 import org.apache.camel.model.ProcessorDefinition;
023 import org.apache.camel.spi.InterceptStrategy;
024
025 /**
026 * This strategy class wraps targeted processors with a
027 * {@link InstrumentationProcessor}. Each InstrumentationProcessor has an
028 * embedded {@link PerformanceCounter} for monitoring performance metrics.
029 * <p/>
030 * This class looks up a map to determine which PerformanceCounter should go into the
031 * InstrumentationProcessor for any particular target processor.
032 *
033 * @version $Revision: 771041 $
034 */
035 public class InstrumentationInterceptStrategy implements InterceptStrategy {
036
037 private Map<ProcessorDefinition, PerformanceCounter> registeredCounters;
038
039 public InstrumentationInterceptStrategy(Map<ProcessorDefinition, PerformanceCounter> registeredCounters) {
040 this.registeredCounters = registeredCounters;
041 }
042
043 public Processor wrapProcessorInInterceptors(ProcessorDefinition processorDefinition, Processor target, Processor nextTarget) throws Exception {
044 // dont double wrap it
045 if (target instanceof InstrumentationProcessor) {
046 return target;
047 }
048
049 // only wrap a performance counter if we have it registered in JMX by the jmx agent
050 PerformanceCounter counter = registeredCounters.get(processorDefinition);
051 if (counter != null) {
052 InstrumentationProcessor wrapper = new InstrumentationProcessor(counter);
053 wrapper.setProcessor(target);
054 wrapper.setType(processorDefinition.getShortName());
055 // remove to not double wrap it
056 registeredCounters.remove(processorDefinition);
057 return wrapper;
058 }
059
060 return target;
061 }
062
063 @Override
064 public String toString() {
065 return "Instrument";
066 }
067 }