hadoop MutableGaugeLong 源码
haddop MutableGaugeLong 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/metrics2/lib/MutableGaugeLong.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.MetricsInfo;
import org.apache.hadoop.metrics2.MetricsRecordBuilder;
import java.util.concurrent.atomic.AtomicLong;
/**
* A mutable long gauge
*/
@InterfaceAudience.Public
@InterfaceStability.Evolving
public class MutableGaugeLong extends MutableGauge {
private AtomicLong value = new AtomicLong();
MutableGaugeLong(MetricsInfo info, long initValue) {
super(info);
this.value.set(initValue);
}
public long value() {
return value.get();
}
@Override
public void incr() {
incr(1);
}
/**
* Increment by delta
* @param delta of the increment
*/
public void incr(long delta) {
value.addAndGet(delta);
setChanged();
}
@Override
public void decr() {
decr(1);
}
/**
* decrement by delta
* @param delta of the decrement
*/
public void decr(long delta) {
value.addAndGet(-delta);
setChanged();
}
/**
* Set the value of the metric
* @param value to set
*/
public void set(long value) {
this.value.set(value);
setChanged();
}
@Override
public void snapshot(MetricsRecordBuilder builder, boolean all) {
if (all || changed()) {
builder.addGauge(info(), value());
clearChanged();
}
}
/**
* @return the value of the metric
*/
public String toString() {
return value.toString();
}
}
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