hadoop MutableMetric 源码

  • 2022-10-20
  • 浏览 (417)

haddop MutableMetric 代码

文件路径:/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/metrics2/lib/MutableMetric.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 org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.metrics2.MetricsRecordBuilder;

/**
 * The mutable metric interface
 */
@InterfaceAudience.Public
@InterfaceStability.Evolving
public abstract class MutableMetric {
  private volatile boolean changed = true;

  /**
   * Get a snapshot of the metric
   * @param builder the metrics record builder
   * @param all if true, snapshot unchanged metrics as well
   */
  public abstract void snapshot(MetricsRecordBuilder builder, boolean all);

  /**
   * Get a snapshot of metric if changed
   * @param builder the metrics record builder
   */
  public void snapshot(MetricsRecordBuilder builder) {
    snapshot(builder, false);
  }

  /**
   * Set the changed flag in mutable operations
   */
  protected void setChanged() { changed = true; }

  /**
   * Clear the changed flag in the snapshot operations
   */
  protected void clearChanged() { changed = false; }

  /**
   * @return  true if metric is changed since last snapshot
   */
  public boolean changed() { return changed; }
}

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