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;
020
021/**
022 * Delegates to another {@link PerformanceCounter}.
023 * <p/>
024 * This is used to allow Camel to pre initialize these delegate performance counters
025 * when Camel creates the actual route from the model. Then later as the various
026 * processors, routes etc. is created and registered in the {@link org.apache.camel.spi.LifecycleStrategy}
027 * then we link this to the real {@link org.apache.camel.management.mbean.ManagedPerformanceCounter} mbean
028 * so the mbean can gather statistics.
029 * <p/>
030 * This delegation is needed as how Camel is designed to register services in the
031 * {@link org.apache.camel.spi.LifecycleStrategy} in various stages.
032 */
033public class DelegatePerformanceCounter implements PerformanceCounter {
034
035    private PerformanceCounter counter;
036    private boolean statisticsEnabled;
037
038    public DelegatePerformanceCounter() {
039    }
040
041    public void setCounter(PerformanceCounter counter) {
042        this.counter = counter;
043        // init statistics based on the real counter based on how we got initialized
044        this.counter.setStatisticsEnabled(statisticsEnabled);
045    }
046
047    public void processExchange(Exchange exchange) {
048        if (counter != null) {
049            counter.processExchange(exchange);
050        }
051    }
052
053    public void completedExchange(Exchange exchange, long time) {
054        if (counter != null) {
055            counter.completedExchange(exchange, time);
056        }
057    }
058
059    public void failedExchange(Exchange exchange) {
060        counter.failedExchange(exchange);
061    }
062
063    public boolean isStatisticsEnabled() {
064        // statistics is only considered enabled if we have a counter to delegate to
065        // otherwise we do not want to gather statistics (we are just a delegate with none to delegate to)
066        return counter != null && counter.isStatisticsEnabled();
067    }
068
069    public void setStatisticsEnabled(boolean statisticsEnabled) {
070        if (counter != null) {
071            counter.setStatisticsEnabled(statisticsEnabled);
072        } else {
073            this.statisticsEnabled = statisticsEnabled;
074        }
075    }
076
077    @Override
078    public String toString() {
079        return counter != null ? counter.toString() : super.toString();
080    }
081}