hadoop CountersAndGauges 源码
haddop CountersAndGauges 代码
文件路径：/hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/statistics/CountersAndGauges.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.hadoop.fs.s3a.statistics;
import java.time.Duration;
import org.apache.hadoop.fs.s3a.Statistic;
import org.apache.hadoop.fs.statistics.DurationTrackerFactory;
/**
* This is the foundational API for collecting S3A statistics.
*/
public interface CountersAndGauges extends DurationTrackerFactory {
/**
* Increment a specific counter.
* No-op if not defined.
* @param op operation
* @param count increment value
*/
void incrementCounter(Statistic op, long count);
/**
* Increment a specific gauge.
* No-op if not defined.
* @param op operation
* @param count increment value
* @throws ClassCastException if the metric is of the wrong type
*/
void incrementGauge(Statistic op, long count);
/**
* Decrement a specific gauge.
* No-op if not defined.
* @param op operation
* @param count increment value
* @throws ClassCastException if the metric is of the wrong type
*/
void decrementGauge(Statistic op, long count);
/**
* Add a value to a quantiles statistic. No-op if the quantile
* isn't found.
* @param op operation to look up.
* @param value value to add.
* @throws ClassCastException if the metric is not a Quantiles.
*/
void addValueToQuantiles(Statistic op, long value);
/**
* Record a duration.
* @param op operation
* @param success was the operation a success?
* @param duration how long did it take
*/
void recordDuration(Statistic op, boolean success, Duration duration);
}
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