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Core module of Micrometer containing instrumentation API and implementation
/*
* Copyright 2017 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;
import io.micrometer.core.instrument.distribution.*;
import io.micrometer.core.instrument.distribution.pause.ClockDriftPauseDetector;
import io.micrometer.core.instrument.distribution.pause.PauseDetector;
import io.micrometer.core.lang.Nullable;
import org.LatencyUtils.IntervalEstimator;
import org.LatencyUtils.SimplePauseDetector;
import org.LatencyUtils.TimeCappedMovingAverageIntervalEstimator;
import java.util.Map;
import java.util.concurrent.Callable;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.TimeUnit;
import java.util.function.Supplier;
public abstract class AbstractTimer extends AbstractMeter implements Timer {
private static Map pauseDetectorCache = new ConcurrentHashMap<>();
protected final Clock clock;
protected final Histogram histogram;
private final TimeUnit baseTimeUnit;
// Only used when pause detection is enabled
@Nullable
private IntervalEstimator intervalEstimator = null;
@Nullable
private org.LatencyUtils.PauseDetector pauseDetector;
/**
* Creates a new timer.
* @param id The timer's name and tags.
* @param clock The clock used to measure latency.
* @param distributionStatisticConfig Configuration determining which distribution
* statistics are sent.
* @param pauseDetector Compensation for coordinated omission.
* @param baseTimeUnit The time scale of this timer.
* @deprecated Timer implementations should now declare at construction time whether
* they support aggregable percentiles or not. By declaring it up front, Micrometer
* can memory optimize the histogram structure used to store distribution statistics.
*/
@Deprecated
protected AbstractTimer(Id id, Clock clock, DistributionStatisticConfig distributionStatisticConfig,
PauseDetector pauseDetector, TimeUnit baseTimeUnit) {
this(id, clock, distributionStatisticConfig, pauseDetector, baseTimeUnit, false);
}
/**
* Creates a new timer.
* @param id The timer's name and tags.
* @param clock The clock used to measure latency.
* @param distributionStatisticConfig Configuration determining which distribution
* statistics are sent.
* @param pauseDetector Compensation for coordinated omission.
* @param baseTimeUnit The time scale of this timer.
* @param supportsAggregablePercentiles Indicates whether the registry supports
* percentile approximations from histograms.
*/
protected AbstractTimer(Id id, Clock clock, DistributionStatisticConfig distributionStatisticConfig,
PauseDetector pauseDetector, TimeUnit baseTimeUnit, boolean supportsAggregablePercentiles) {
super(id);
this.clock = clock;
this.baseTimeUnit = baseTimeUnit;
initPauseDetector(pauseDetector);
if (distributionStatisticConfig.isPublishingPercentiles()) {
// hdr-based histogram
this.histogram = new TimeWindowPercentileHistogram(clock, distributionStatisticConfig,
supportsAggregablePercentiles);
}
else if (distributionStatisticConfig.isPublishingHistogram()) {
// fixed boundary histograms, which have a slightly better memory footprint
// when we don't need Micrometer-computed percentiles
this.histogram = new TimeWindowFixedBoundaryHistogram(clock, distributionStatisticConfig,
supportsAggregablePercentiles);
}
else {
// noop histogram
this.histogram = NoopHistogram.INSTANCE;
}
}
private void initPauseDetector(PauseDetector pauseDetectorType) {
pauseDetector = pauseDetectorCache.computeIfAbsent(pauseDetectorType, detector -> {
if (detector instanceof ClockDriftPauseDetector) {
ClockDriftPauseDetector clockDriftPauseDetector = (ClockDriftPauseDetector) detector;
return new SimplePauseDetector(clockDriftPauseDetector.getSleepInterval().toNanos(),
clockDriftPauseDetector.getPauseThreshold().toNanos(), 1, false);
}
return null;
});
if (pauseDetector instanceof SimplePauseDetector) {
this.intervalEstimator = new TimeCappedMovingAverageIntervalEstimator(128, 10000000000L, pauseDetector);
pauseDetector.addListener((pauseLength, pauseEndTime) -> {
if (intervalEstimator != null) {
long estimatedInterval = intervalEstimator.getEstimatedInterval(pauseEndTime);
long observedLatencyMinbar = pauseLength - estimatedInterval;
if (observedLatencyMinbar >= estimatedInterval) {
recordValueWithExpectedInterval(observedLatencyMinbar, estimatedInterval);
}
}
});
}
}
private void recordValueWithExpectedInterval(long nanoValue, long expectedIntervalBetweenValueSamples) {
record(nanoValue, TimeUnit.NANOSECONDS);
if (expectedIntervalBetweenValueSamples <= 0)
return;
for (long missingValue = nanoValue
- expectedIntervalBetweenValueSamples; missingValue >= expectedIntervalBetweenValueSamples; missingValue -= expectedIntervalBetweenValueSamples) {
record(missingValue, TimeUnit.NANOSECONDS);
}
}
@Override
public T recordCallable(Callable f) throws Exception {
final long s = clock.monotonicTime();
try {
return f.call();
}
finally {
final long e = clock.monotonicTime();
record(e - s, TimeUnit.NANOSECONDS);
}
}
@Override
public T record(Supplier f) {
final long s = clock.monotonicTime();
try {
return f.get();
}
finally {
final long e = clock.monotonicTime();
record(e - s, TimeUnit.NANOSECONDS);
}
}
@Override
public void record(Runnable f) {
final long s = clock.monotonicTime();
try {
f.run();
}
finally {
final long e = clock.monotonicTime();
record(e - s, TimeUnit.NANOSECONDS);
}
}
@Override
public final void record(long amount, TimeUnit unit) {
if (amount >= 0) {
histogram.recordLong(TimeUnit.NANOSECONDS.convert(amount, unit));
recordNonNegative(amount, unit);
if (intervalEstimator != null) {
intervalEstimator.recordInterval(clock.monotonicTime());
}
}
}
protected abstract void recordNonNegative(long amount, TimeUnit unit);
@Override
public HistogramSnapshot takeSnapshot() {
return histogram.takeSnapshot(count(), totalTime(TimeUnit.NANOSECONDS), max(TimeUnit.NANOSECONDS));
}
@Override
public TimeUnit baseTimeUnit() {
return baseTimeUnit;
}
@Override
public void close() {
histogram.close();
if (pauseDetector != null) {
pauseDetector.shutdown();
}
}
}