kafka SimpleRate 源码
kafka SimpleRate 代码
文件路径：/clients/src/main/java/org/apache/kafka/common/metrics/stats/SimpleRate.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 simple rate the rate is incrementally calculated
* based on the elapsed time between the earliest reading
* and now.
*
* An exception is made for the first window, which is
* considered of fixed size. This avoids the issue of
* an artificially high rate when the gap between readings
* is close to 0.
*/
public class SimpleRate extends Rate {
@Override
public long windowSize(MetricConfig config, long now) {
stat.purgeObsoleteSamples(config, now);
long elapsed = now - stat.oldest(now).lastWindowMs;
return Math.max(elapsed, config.timeWindowMs());
}
}
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