hadoop MutableCounter 源码
haddop MutableCounter 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/metrics2/lib/MutableCounter.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 static org.apache.hadoop.util.Preconditions.*;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.metrics2.MetricsInfo;
/**
* The mutable counter (monotonically increasing) metric interface
*/
@InterfaceAudience.Public
@InterfaceStability.Evolving
public abstract class MutableCounter extends MutableMetric {
private final MetricsInfo info;
protected MutableCounter(MetricsInfo info) {
this.info = checkNotNull(info, "counter info");
}
protected MetricsInfo info() {
return info;
}
/**
* Increment the metric value by 1.
*/
public abstract void incr();
}
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