/**
* 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.metrics2.MetricsRecordBuilder;
/**
* A mutable long gauge
*/
public class MetricMutableGaugeLong extends MetricMutableGauge<Long> {
private volatile long value;
/**
* Construct a mutable long gauge metric
* @param name of the gauge
* @param description of the gauge
* @param initValue the initial value of the gauge
*/
public MetricMutableGaugeLong(String name, String description,
long initValue) {
super(name, description);
this.value = initValue;
}
public synchronized void incr() {
++value;
setChanged();
}
/**
* Increment by delta
* @param delta of the increment
*/
public synchronized void incr(long delta) {
value += delta;
setChanged();
}
public synchronized void decr() {
--value;
setChanged();
}
/**
* decrement by delta
* @param delta of the decrement
*/
public synchronized void decr(long delta) {
value -= delta;
setChanged();
}
/**
* Set the value of the metric
* @param value to set
*/
public void set(long value) {
this.value = value;
setChanged();
}
public void snapshot(MetricsRecordBuilder builder, boolean all) {
if (all || changed()) {
builder.addGauge(name, description, value);
clearChanged();
}
}
}