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/**
* Copyright 2013 Netflix, Inc.
*
* Licensed 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 com.netflix.servo.monitor;
import com.netflix.servo.stats.StatsConfig;
import com.netflix.servo.tag.Tags;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
/**
* A {@link Timer} that provides statistics.
*
* The statistics are collected periodically and are published according to the configuration
* specified by the user using a {@link com.netflix.servo.stats.StatsConfig} object. Please
* make sure that the sampleSize corresponds to roughly the number of samples expected in
* a reporting interval. While the statistics collected are accurate for this machine they will not
* be correct if they are aggregated across groups of machines.
* If that is an expected use-case a better
* approach is to use buckets that correspond to different times.
* For example you might have a counter
* that tracks how many calls took < 20ms, one for [ 20ms, 500ms ], and one for > 500ms.
* This bucketing approach can be easily aggregated.
* See {@link com.netflix.servo.monitor.BucketTimer}
*/
public class StatsTimer extends StatsMonitor implements Timer {
private final TimeUnit timeUnit;
private static final String UNIT = "unit";
/**
* Creates a new instance of the timer with a unit of milliseconds, using the default executor.
*/
public StatsTimer(MonitorConfig baseConfig, StatsConfig statsConfig) {
this(baseConfig, statsConfig, TimeUnit.MILLISECONDS, DEFAULT_EXECUTOR);
}
/**
* Creates a new instance of the timer with a given unit, using the default executor.
*/
public StatsTimer(MonitorConfig baseConfig, StatsConfig statsConfig, TimeUnit unit) {
this(baseConfig, statsConfig, unit, DEFAULT_EXECUTOR);
}
/**
* Creates a new instance of the timer with a unit of milliseconds,
* using the {@link ScheduledExecutorService} provided by
* the user.
* To avoid memory leaks the ScheduledExecutorService
* should have the policy to remove tasks from the work queue.
* See {@link java.util.concurrent.ScheduledThreadPoolExecutor#setRemoveOnCancelPolicy(boolean)}
*/
public StatsTimer(MonitorConfig config, StatsConfig statsConfig, TimeUnit unit,
ScheduledExecutorService executor) {
super(config, statsConfig, executor, "totalTime", false, Tags.newTag(UNIT, unit.name()));
this.timeUnit = unit;
startComputingStats();
}
/**
* {@inheritDoc}
*/
@Override
public Stopwatch start() {
Stopwatch s = new TimedStopwatch(this);
s.start();
return s;
}
/**
* {@inheritDoc}
*/
@Override
public TimeUnit getTimeUnit() {
return timeUnit;
}
/**
* {@inheritDoc}
*/
@Override
public void record(long duration, TimeUnit timeUnit) {
record(this.timeUnit.convert(duration, timeUnit));
}
/**
* {@inheritDoc}
*/
@Override
public String toString() {
return "StatsTimer{StatsMonitor=" + super.toString() + ", timeUnit=" + timeUnit + '}';
}
/**
* {@inheritDoc}
*/
@Override
public boolean equals(Object obj) {
if (!(obj instanceof StatsTimer)) {
return false;
}
final StatsTimer m = (StatsTimer) obj;
return super.equals(obj) && timeUnit.equals(m.timeUnit);
}
/**
* {@inheritDoc}
*/
@Override
public int hashCode() {
int result = super.hashCode();
result = 31 * result + timeUnit.hashCode();
return result;
}
/**
* Get the number of times this timer has been updated.
*/
public long getCount() {
return count.getValue().longValue();
}
/**
* Get the total time recorded for this timer.
*/
public long getTotalTime() {
return getTotalMeasurement();
}
}
