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/*
* 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.qpid.server.stats;
import java.util.Date;
import java.util.concurrent.atomic.AtomicLong;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* This class collects statistics and counts the total, rate per second and
* peak rate per second values for the events that are registered with it.
*/
public class StatisticsCounter
{
private static final Logger _log = LoggerFactory.getLogger(StatisticsCounter.class);
public static final long DEFAULT_SAMPLE_PERIOD = Long.getLong("qpid.statistics.samplePeriod", 2000L); // 2s
public static final boolean DISABLE_STATISTICS = Boolean.getBoolean("qpid.statistics.disable");
private static final String COUNTER = "counter";
private static final AtomicLong _counterIds = new AtomicLong(0L);
private long _peak = 0L;
private long _total = 0L;
private long _temp = 0L;
private long _last = 0L;
private long _rate = 0L;
private long _start;
private final long _period;
private final String _name;
public StatisticsCounter()
{
this(COUNTER);
}
public StatisticsCounter(String name)
{
this(name, DEFAULT_SAMPLE_PERIOD);
}
public StatisticsCounter(String name, long period)
{
_period = period;
_name = name + "-" + + _counterIds.incrementAndGet();
reset();
}
public void registerEvent()
{
registerEvent(1L);
}
public void registerEvent(long value)
{
registerEvent(value, System.currentTimeMillis());
}
public void registerEvent(long value, long timestamp)
{
if (DISABLE_STATISTICS)
{
return;
}
long thisSample = (timestamp / _period);
synchronized (this)
{
if (thisSample > _last)
{
_last = thisSample;
_rate = _temp;
_temp = 0L;
if (_rate > _peak)
{
_peak = _rate;
}
}
_total += value;
_temp += value;
}
}
/**
* Update the current rate and peak - may reset rate to zero if a new
* sample period has started.
*/
private void update()
{
registerEvent(0L, System.currentTimeMillis());
}
/**
* Reset
*/
public void reset()
{
_log.info("Resetting statistics for counter: " + _name);
_peak = 0L;
_rate = 0L;
_total = 0L;
_start = System.currentTimeMillis();
_last = _start / _period;
}
public double getPeak()
{
update();
return (double) _peak / ((double) _period / 1000.0d);
}
public double getRate()
{
update();
return (double) _rate / ((double) _period / 1000.0d);
}
public long getTotal()
{
return _total;
}
public long getStart()
{
return _start;
}
public Date getStartTime()
{
return new Date(_start);
}
public String getName()
{
return _name;
}
public long getPeriod()
{
return _period;
}
}
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