hadoop MutableGaugeFloat 源码
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();
}
}
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