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.Exchange;
020    import org.apache.camel.api.management.PerformanceCounter;
021    
022    /**
023     * Delegates to another {@link org.apache.camel.api.management.PerformanceCounter}.
024     * <p/>
025     * This is used to allow Camel to pre initialize these delegate performance counters
026     * when Camel creates the actual route from the model. Then later as the various
027     * processors, routes etc. is created and registered in the {@link org.apache.camel.spi.LifecycleStrategy}
028     * then we link this to the real {@link org.apache.camel.management.mbean.ManagedPerformanceCounter} mbean
029     * so the mbean can gather statistics.
030     * <p/>
031     * This delegation is needed as how Camel is designed to register services in the
032     * {@link org.apache.camel.spi.LifecycleStrategy} in various stages.
033     *
034     * @version 
035     */
036    public class DelegatePerformanceCounter implements PerformanceCounter {
037    
038        private PerformanceCounter counter;
039        private boolean statisticsEnabled;
040    
041        public DelegatePerformanceCounter() {
042        }
043    
044        public void setCounter(PerformanceCounter counter) {
045            this.counter = counter;
046            // init statistics based on the real counter based on how we got initialized
047            this.counter.setStatisticsEnabled(statisticsEnabled);
048        }
049    
050        public void completedExchange(Exchange exchange, long time) {
051            counter.completedExchange(exchange, time);
052        }
053    
054        public void failedExchange(Exchange exchange) {
055            counter.failedExchange(exchange);
056        }
057    
058        public boolean isStatisticsEnabled() {
059            // statistics is only considered enabled if we have a counter to delegate to
060            // otherwise we do not want to gather statistics (we are just a delegate with none to delegate to)
061            return counter != null && counter.isStatisticsEnabled();
062        }
063    
064        public void setStatisticsEnabled(boolean statisticsEnabled) {
065            if (counter != null) {
066                counter.setStatisticsEnabled(statisticsEnabled);
067            } else {
068                this.statisticsEnabled = statisticsEnabled;
069            }
070        }
071    
072        @Override
073        public String toString() {
074            return counter != null ? counter.toString() : super.toString();
075        }
076    }