org.apache.activemq.management.PollCountStatisticImpl Maven / Gradle / Ivy
/**
* 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;
/**
* A count statistic implementation
*
*
*/
public class PollCountStatisticImpl extends StatisticImpl implements CountStatistic {
private PollCountStatisticImpl parent;
private List 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();
}
children.add(child);
}
public synchronized long getCount() {
if (children == null) {
return 0;
}
long count = 0;
for (Iterator 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;
}
}