/**
* 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 com.alibaba.jstorm.common.metric;
import com.alibaba.jstorm.common.metric.codahale.ExponentiallyDecayingReservoir;
import com.alibaba.jstorm.common.metric.codahale.JHistogram;
import com.alibaba.jstorm.common.metric.old.operator.convert.AtomicLongToLong;
import com.alibaba.jstorm.common.metric.snapshot.AsmHistogramSnapshot;
import com.alibaba.jstorm.common.metric.snapshot.AsmSnapshot;
import com.alibaba.jstorm.metric.JStormMetrics;
import com.alibaba.jstorm.metric.MetricUtils;
import com.alibaba.jstorm.utils.TimeUtils;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.LockSupport;
/**
* each window has a separate histogram, which is recreated after the window cycle.
*/
public class AsmHistogram extends AsmMetric<JHistogram> {
private final Map<Integer, JHistogram> histogramMap = new ConcurrentHashMap<>();
private JHistogram unFlushed = newHistogram();
private TimeUnit timeUnit = TimeUnit.MILLISECONDS;
private static volatile long updateInterval = 10;
private volatile long lastUpdateTime = System.currentTimeMillis();
public AsmHistogram() {
super();
for (int win : windowSeconds) {
histogramMap.put(win, newHistogram());
}
}
public AsmHistogram(TimeUnit timeUnit) {
this();
setTimeUnit(timeUnit);
}
public void setTimeUnit(TimeUnit timeUnit) {
if (timeUnit != TimeUnit.MILLISECONDS && timeUnit != TimeUnit.NANOSECONDS) {
throw new RuntimeException("bad time unit, only ms & ns are supported!");
}
this.timeUnit = timeUnit;
}
public long getTime() {
if (JStormMetrics.enabled) {
long now = System.currentTimeMillis();
long elapsed = now - lastUpdateTime;
if (elapsed >= updateInterval) {
lastUpdateTime = now;
if (timeUnit == TimeUnit.MILLISECONDS) {
return now;
} else {
return System.nanoTime();
}
}
}
return -1L;
}
public boolean okToUpdate(long now) {
return (now - lastUpdateTime >= updateInterval);
}
@Override
public void update(Number obj) {
if (JStormMetrics.enabled && sample() && enabled.get()) {
this.unFlushed.update(obj.longValue());
}
}
@Override
public void updateTime(long start) {
if (JStormMetrics.enabled) {
if (sample() && enabled.get() && start >= 0L) {
if (timeUnit == TimeUnit.MILLISECONDS) {
long end = System.currentTimeMillis();
this.unFlushed.update((end - start) * TimeUtils.US_PER_MS);
} else {
long end = System.nanoTime();
this.unFlushed.update((end - start) / TimeUtils.NS_PER_US);
}
}
}
}
public void updateTime(long start, int n) {
if (JStormMetrics.enabled) {
if (sample() && enabled.get() && start >= 0L) {
if (timeUnit == TimeUnit.MILLISECONDS) {
long end = System.currentTimeMillis();
long delta = (end - start) / n;
this.unFlushed.update(delta * TimeUtils.US_PER_MS);
} else {
long end = System.nanoTime();
long delta = (end - start) / n;
this.unFlushed.update(delta / TimeUtils.NS_PER_US);
}
}
}
}
public void setLastUpdateTime(long time) {
lastUpdateTime = time;
}
@Override
public void updateDirectly(Number obj) {
this.unFlushed.update(obj.longValue());
}
@Override
public Map<Integer, JHistogram> getWindowMetricMap() {
return histogramMap;
}
@Override
public JHistogram mkInstance() {
return newHistogram();
}
@Override
protected void updateSnapshot(int window) {
JHistogram histogram = histogramMap.get(window);
if (histogram != null) {
AsmSnapshot snapshot = new AsmHistogramSnapshot().setSnapshot(histogram.getSnapshot())
.setTs(System.currentTimeMillis()).setMetricId(metricId);
snapshots.put(window, snapshot);
}
}
@Override
public Object getValue(Integer window) {
throw new UnsupportedOperationException("Not supported for histograms");
}
/**
* flush temp histogram data to all windows & assoc metrics.
*/
protected void doFlush() {
long[] values = unFlushed.getSnapshot().getValues();
for (JHistogram histogram : histogramMap.values()) {
for (long val : values) {
histogram.update(val);
}
}
if (MetricUtils.metricAccurateCal) {
for (long val : values) {
for (AsmMetric metric : this.assocMetrics) {
metric.updateDirectly(val);
}
}
}
this.unFlushed = newHistogram();
}
@Override
public AsmMetric clone() {
return new AsmHistogram(timeUnit);
}
private JHistogram newHistogram() {
return new JHistogram(new ExponentiallyDecayingReservoir());
}
public static void setUpdateInterval(long interval) {
if (interval < 0 || interval > TimeUtils.MS_PER_SEC) {
throw new RuntimeException("timerUpdateInterval must be between 0~1000");
}
updateInterval = interval;
}
public static long getUpdateInterval() {
return updateInterval;
}
}