| /** |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.activemq.management; |
| |
| import java.util.ArrayList; |
| import java.util.Iterator; |
| import java.util.List; |
| |
| import javax.management.j2ee.statistics.CountStatistic; |
| |
| /** |
| * A count statistic implementation |
| * |
| * |
| */ |
| public class PollCountStatisticImpl extends StatisticImpl implements CountStatistic { |
| |
| private PollCountStatisticImpl parent; |
| private List<PollCountStatisticImpl> children; |
| |
| public PollCountStatisticImpl(PollCountStatisticImpl parent, String name, String description) { |
| this(name, description); |
| setParent(parent); |
| } |
| |
| public PollCountStatisticImpl(String name, String description) { |
| this(name, "count", description); |
| } |
| |
| public PollCountStatisticImpl(String name, String unit, String description) { |
| super(name, unit, description); |
| } |
| |
| public PollCountStatisticImpl getParent() { |
| return parent; |
| } |
| |
| public void setParent(PollCountStatisticImpl parent) { |
| if (this.parent != null) { |
| this.parent.removeChild(this); |
| } |
| this.parent = parent; |
| if (this.parent != null) { |
| this.parent.addChild(this); |
| } |
| } |
| |
| private synchronized void removeChild(PollCountStatisticImpl child) { |
| if (children != null) { |
| children.remove(child); |
| } |
| } |
| |
| private synchronized void addChild(PollCountStatisticImpl child) { |
| if (children == null) { |
| children = new ArrayList<PollCountStatisticImpl>(); |
| } |
| children.add(child); |
| } |
| |
| public synchronized long getCount() { |
| if (children == null) { |
| return 0; |
| } |
| long count = 0; |
| for (Iterator<PollCountStatisticImpl> iter = children.iterator(); iter.hasNext();) { |
| PollCountStatisticImpl child = iter.next(); |
| count += child.getCount(); |
| } |
| return count; |
| } |
| |
| protected void appendFieldDescription(StringBuffer buffer) { |
| buffer.append(" count: "); |
| buffer.append(Long.toString(getCount())); |
| super.appendFieldDescription(buffer); |
| } |
| |
| /** |
| * @return the average time period that elapses between counter increments |
| * since the last reset. |
| */ |
| public double getPeriod() { |
| double count = getCount(); |
| if (count == 0) { |
| return 0; |
| } |
| double time = System.currentTimeMillis() - getStartTime(); |
| return time / (count * 1000.0); |
| } |
| |
| /** |
| * @return the number of times per second that the counter is incrementing |
| * since the last reset. |
| */ |
| public double getFrequency() { |
| double count = getCount(); |
| double time = System.currentTimeMillis() - getStartTime(); |
| return count * 1000.0 / time; |
| } |
| |
| } |