1 /*** 2 * 3 * Copyright 2004 Protique Ltd 4 * 5 * Licensed under the Apache License, Version 2.0 (the "License"); 6 * you may not use this file except in compliance with the License. 7 * You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 * 17 **/ 18 package org.activeio.stats; 19 20 import EDU.oswego.cs.dl.util.concurrent.SynchronizedLong; 21 22 import javax.management.j2ee.statistics.CountStatistic; 23 24 /*** 25 * Shamelessly taken from the ActiveMQ project ( http://activemq.com ) 26 * A count statistic implementation 27 * 28 * @version $Revision: 1.1 $ 29 */ 30 public class CountStatisticImpl extends StatisticImpl implements CountStatistic { 31 32 private final SynchronizedLong counter = new SynchronizedLong(0); 33 private CountStatisticImpl parent; 34 35 public CountStatisticImpl(CountStatisticImpl parent, String name, String description) { 36 this(name, description); 37 this.parent = parent; 38 } 39 40 public CountStatisticImpl(String name, String description) { 41 this(name, "count", description); 42 } 43 44 public CountStatisticImpl(String name, String unit, String description) { 45 super(name, unit, description); 46 } 47 48 public void reset() { 49 super.reset(); 50 counter.set(0); 51 } 52 53 public long getCount() { 54 return counter.get(); 55 } 56 57 public void setCount(long count) { 58 counter.set(count); 59 } 60 61 public void add(long amount) { 62 counter.add(amount); 63 updateSampleTime(); 64 if (parent != null) { 65 parent.add(amount); 66 } 67 } 68 69 public void increment() { 70 counter.increment(); 71 updateSampleTime(); 72 if (parent != null) { 73 parent.increment(); 74 } 75 } 76 77 public void subtract(long amount) { 78 counter.subtract(amount); 79 updateSampleTime(); 80 if (parent != null) { 81 parent.subtract(amount); 82 } 83 } 84 85 public void decrement() { 86 counter.decrement(); 87 updateSampleTime(); 88 if (parent != null) { 89 parent.decrement(); 90 } 91 } 92 93 public CountStatisticImpl getParent() { 94 return parent; 95 } 96 97 public void setParent(CountStatisticImpl parent) { 98 this.parent = parent; 99 } 100 101 protected void appendFieldDescription(StringBuffer buffer) { 102 buffer.append(" count: "); 103 buffer.append(Long.toString(counter.get())); 104 super.appendFieldDescription(buffer); 105 } 106 }