kafka Meter 源码
kafka Meter 代码
文件路径:/clients/src/main/java/org/apache/kafka/common/metrics/stats/Meter.java
/*
* 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.kafka.common.metrics.stats;
import java.util.Arrays;
import java.util.List;
import java.util.concurrent.TimeUnit;
import org.apache.kafka.common.MetricName;
import org.apache.kafka.common.metrics.CompoundStat;
import org.apache.kafka.common.metrics.MetricConfig;
/**
* A compound stat that includes a rate metric and a cumulative total metric.
*/
public class Meter implements CompoundStat {
private final MetricName rateMetricName;
private final MetricName totalMetricName;
private final Rate rate;
private final CumulativeSum total;
/**
* Construct a Meter with seconds as time unit
*/
public Meter(MetricName rateMetricName, MetricName totalMetricName) {
this(TimeUnit.SECONDS, new WindowedSum(), rateMetricName, totalMetricName);
}
/**
* Construct a Meter with provided time unit
*/
public Meter(TimeUnit unit, MetricName rateMetricName, MetricName totalMetricName) {
this(unit, new WindowedSum(), rateMetricName, totalMetricName);
}
/**
* Construct a Meter with seconds as time unit
*/
public Meter(SampledStat rateStat, MetricName rateMetricName, MetricName totalMetricName) {
this(TimeUnit.SECONDS, rateStat, rateMetricName, totalMetricName);
}
/**
* Construct a Meter with provided time unit
*/
public Meter(TimeUnit unit, SampledStat rateStat, MetricName rateMetricName, MetricName totalMetricName) {
if (!(rateStat instanceof WindowedSum)) {
throw new IllegalArgumentException("Meter is supported only for WindowedCount or WindowedSum.");
}
this.total = new CumulativeSum();
this.rate = new Rate(unit, rateStat);
this.rateMetricName = rateMetricName;
this.totalMetricName = totalMetricName;
}
@Override
public List<NamedMeasurable> stats() {
return Arrays.asList(
new NamedMeasurable(totalMetricName, total),
new NamedMeasurable(rateMetricName, rate));
}
@Override
public void record(MetricConfig config, double value, long timeMs) {
rate.record(config, value, timeMs);
// Total metrics with Count stat should record 1.0 (as recorded in the count)
double totalValue = (rate.stat instanceof WindowedCount) ? 1.0 : value;
total.record(config, totalValue, timeMs);
}
@Override
public String toString() {
return "Meter(" +
"rate=" + rate +
", total=" + total +
", rateMetricName=" + rateMetricName +
", totalMetricName=" + totalMetricName +
')';
}
}
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