kafka WindowedSum 源码
kafka WindowedSum 代码
文件路径：/clients/src/main/java/org/apache/kafka/common/metrics/stats/WindowedSum.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.MetricConfig;
import java.util.List;
/**
* A {@link SampledStat} that maintains the sum of what it has seen.
* This is a sampled version of {@link CumulativeSum}.
*
* See also {@link WindowedCount} if you want to increment the value by 1 on each recording.
*/
public class WindowedSum extends SampledStat {
public WindowedSum() {
super(0);
}
@Override
protected void update(Sample sample, MetricConfig config, double value, long now) {
sample.value += value;
}
@Override
public double combine(List<Sample> samples, MetricConfig config, long now) {
double total = 0.0;
for (Sample sample : samples)
total += sample.value;
return total;
}
}
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