kafka CumulativeSum 源码
kafka CumulativeSum 代码
文件路径：/clients/src/main/java/org/apache/kafka/common/metrics/stats/CumulativeSum.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 org.apache.kafka.common.metrics.MeasurableStat;
import org.apache.kafka.common.metrics.MetricConfig;
/**
* An non-sampled cumulative total maintained over all time.
* This is a non-sampled version of {@link WindowedSum}.
*
* See also {@link CumulativeCount} if you just want to increment the value by 1 on each recording.
*/
public class CumulativeSum implements MeasurableStat {
private double total;
public CumulativeSum() {
total = 0.0;
}
public CumulativeSum(double value) {
total = value;
}
@Override
public void record(MetricConfig config, double value, long now) {
total += value;
}
@Override
public double measure(MetricConfig config, long now) {
return total;
}
@Override
public String toString() {
return "CumulativeSum(total=" + total + ")";
}
}
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