kafka WindowedCount 源码
kafka WindowedCount 代码
文件路径：/clients/src/main/java/org/apache/kafka/common/metrics/stats/WindowedCount.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;
/**
* A {@link SampledStat} that maintains a simple count of what it has seen.
* This is a special kind of {@link WindowedSum} that always records a value of {@code 1} instead of the provided value.
* In other words, it counts the number of
* {@link WindowedCount#record(MetricConfig, double, long)} invocations,
* instead of summing the recorded values.
*
* See also {@link CumulativeCount} for a non-sampled version of this metric.
*/
public class WindowedCount extends WindowedSum {
@Override
protected void update(Sample sample, MetricConfig config, double value, long now) {
super.update(sample, config, 1.0, now);
}
}
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