io.micrometer.core.instrument.internal.CumulativeHistogramLongTaskTimer Maven / Gradle / Ivy
/*
* Copyright 2020 VMware, 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
*
* https://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 io.micrometer.core.instrument.internal;
import io.micrometer.core.instrument.Clock;
import io.micrometer.core.instrument.distribution.CountAtBucket;
import io.micrometer.core.instrument.distribution.DistributionStatisticConfig;
import io.micrometer.core.instrument.distribution.HistogramSnapshot;
import io.micrometer.core.lang.Nullable;
import java.util.Arrays;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
/**
* Extends the default long task timer, making histogram counts cumulative over time.
*
* @author Jon Schneider
* @since 1.5.2
*/
public class CumulativeHistogramLongTaskTimer extends DefaultLongTaskTimer {
@Nullable
private CountAtBucket[] lastSnapshot;
public CumulativeHistogramLongTaskTimer(Id id, Clock clock, TimeUnit baseTimeUnit,
DistributionStatisticConfig distributionStatisticConfig) {
super(id, clock, baseTimeUnit, distributionStatisticConfig, true);
}
@Override
public HistogramSnapshot takeSnapshot() {
HistogramSnapshot snapshot = super.takeSnapshot();
AtomicInteger i = new AtomicInteger();
snapshot = new HistogramSnapshot(snapshot.count(), snapshot.total(), snapshot.max(),
snapshot.percentileValues(),
Arrays.stream(snapshot.histogramCounts())
.map(countAtBucket -> lastSnapshot == null ? countAtBucket
: new CountAtBucket(countAtBucket.bucket(),
countAtBucket.count() + lastSnapshot[i.getAndIncrement()].count()))
.toArray(CountAtBucket[]::new),
snapshot::outputSummary);
lastSnapshot = snapshot.histogramCounts();
return snapshot;
}
}