001 /** 002 * 003 * Copyright 2004 Protique Ltd 004 * 005 * Licensed under the Apache License, Version 2.0 (the "License"); 006 * you may not use this file except in compliance with the License. 007 * 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 **/ 018 package org.activemq.management; 019 020 import EDU.oswego.cs.dl.util.concurrent.SynchronizedLong; 021 022 /** 023 * A count statistic implementation 024 * 025 * @version $Revision: 1.1.1.1 $ 026 */ 027 public class CountStatisticImpl extends StatisticImpl { 028 029 private final SynchronizedLong counter = new SynchronizedLong(0); 030 private CountStatisticImpl parent; 031 032 public CountStatisticImpl(CountStatisticImpl parent, String name, String description) { 033 this(name, description); 034 this.parent = parent; 035 } 036 037 public CountStatisticImpl(String name, String description) { 038 this(name, "count", description); 039 } 040 041 public CountStatisticImpl(String name, String unit, String description) { 042 super(name, unit, description); 043 } 044 045 public void reset() { 046 super.reset(); 047 counter.set(0); 048 } 049 050 public long getCount() { 051 return counter.get(); 052 } 053 054 public void setCount(long count) { 055 counter.set(count); 056 } 057 058 public void add(long amount) { 059 counter.add(amount); 060 updateSampleTime(); 061 if (parent != null) { 062 parent.add(amount); 063 } 064 } 065 066 public void increment() { 067 counter.increment(); 068 updateSampleTime(); 069 if (parent != null) { 070 parent.increment(); 071 } 072 } 073 074 public void subtract(long amount) { 075 counter.subtract(amount); 076 updateSampleTime(); 077 if (parent != null) { 078 parent.subtract(amount); 079 } 080 } 081 082 public void decrement() { 083 counter.decrement(); 084 updateSampleTime(); 085 if (parent != null) { 086 parent.decrement(); 087 } 088 } 089 090 public CountStatisticImpl getParent() { 091 return parent; 092 } 093 094 public void setParent(CountStatisticImpl parent) { 095 this.parent = parent; 096 } 097 098 protected void appendFieldDescription(StringBuffer buffer) { 099 buffer.append(" count: "); 100 buffer.append(Long.toString(counter.get())); 101 super.appendFieldDescription(buffer); 102 } 103 }