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 */
017package org.apache.camel.management;
018
019import org.apache.camel.Exchange;
020import 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 */
036public 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 processExchange(Exchange exchange) {
051        if (counter != null) {
052            counter.processExchange(exchange);
053        }
054    }
055
056    public void completedExchange(Exchange exchange, long time) {
057        if (counter != null) {
058            counter.completedExchange(exchange, time);
059        }
060    }
061
062    public void failedExchange(Exchange exchange) {
063        counter.failedExchange(exchange);
064    }
065
066    public boolean isStatisticsEnabled() {
067        // statistics is only considered enabled if we have a counter to delegate to
068        // otherwise we do not want to gather statistics (we are just a delegate with none to delegate to)
069        return counter != null && counter.isStatisticsEnabled();
070    }
071
072    public void setStatisticsEnabled(boolean statisticsEnabled) {
073        if (counter != null) {
074            counter.setStatisticsEnabled(statisticsEnabled);
075        } else {
076            this.statisticsEnabled = statisticsEnabled;
077        }
078    }
079
080    @Override
081    public String toString() {
082        return counter != null ? counter.toString() : super.toString();
083    }
084}