hadoop MutableGaugeFloat 源码

  • 2022-10-20
  • 浏览 (381)

haddop MutableGaugeFloat 代码

文件路径:/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/metrics2/lib/MutableGaugeFloat.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.metrics2.lib;

import java.util.concurrent.atomic.AtomicInteger;

import org.apache.hadoop.metrics2.MetricsInfo;
import org.apache.hadoop.metrics2.MetricsRecordBuilder;

/**
 * A mutable float gauge.
 */
public class MutableGaugeFloat extends MutableGauge {

  private AtomicInteger value = new AtomicInteger();

  MutableGaugeFloat(MetricsInfo info, float initValue) {
    super(info);
    this.value.set(Float.floatToIntBits(initValue));
  }

  public float value() {
    return Float.intBitsToFloat(value.get());
  }

  @Override
  public void incr() {
    incr(1.0f);
  }

  @Override
  public void decr() {
    incr(-1.0f);
  }

  @Override
  public void snapshot(MetricsRecordBuilder builder, boolean all) {
    if (all || changed()) {
      builder.addGauge(info(), value());
      clearChanged();
    }
  }

  public void set(float value) {
    this.value.set(Float.floatToIntBits(value));
    setChanged();
  }

  private final boolean compareAndSet(float expect, float update) {
    return value.compareAndSet(Float.floatToIntBits(expect),
        Float.floatToIntBits(update));
  }

  private void incr(float delta) {
    while (true) {
      float current = value.get();
      float next = current + delta;
      if (compareAndSet(current, next)) {
        setChanged();
        return;
      }
    }
  }

  /**
   * @return  the value of the metric
   */
  public String toString() {
    return value.toString();
  }
}

相关信息

hadoop 源码目录

相关文章

hadoop DefaultMetricsFactory 源码

hadoop DefaultMetricsSystem 源码

hadoop Interns 源码

hadoop MethodMetric 源码

hadoop MetricsAnnotations 源码

hadoop MetricsInfoImpl 源码

hadoop MetricsRegistry 源码

hadoop MetricsSourceBuilder 源码

hadoop MutableCounter 源码

hadoop MutableCounterInt 源码

0  赞