| /** |
| * 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; |
| |
| /** |
| * A mutable int gauge |
| */ |
| @InterfaceAudience.Public |
| @InterfaceStability.Evolving |
| public class MutableGaugeInt extends MutableGauge { |
| |
| private volatile int value; |
| |
| MutableGaugeInt(MetricsInfo info, int initValue) { |
| super(info); |
| this.value = initValue; |
| } |
| |
| public int value() { |
| return value; |
| } |
| |
| @Override |
| public synchronized void incr() { |
| ++value; |
| setChanged(); |
| } |
| |
| /** |
| * Increment by delta |
| * @param delta of the increment |
| */ |
| public synchronized void incr(int delta) { |
| value += delta; |
| setChanged(); |
| } |
| |
| @Override |
| public synchronized void decr() { |
| --value; |
| setChanged(); |
| } |
| |
| /** |
| * decrement by delta |
| * @param delta of the decrement |
| */ |
| public synchronized void decr(int delta) { |
| value -= delta; |
| setChanged(); |
| } |
| |
| /** |
| * Set the value of the metric |
| * @param value to set |
| */ |
| public void set(int value) { |
| this.value = value; |
| setChanged(); |
| } |
| |
| @Override |
| public void snapshot(MetricsRecordBuilder builder, boolean all) { |
| if (all || changed()) { |
| builder.addGauge(info(), value); |
| clearChanged(); |
| } |
| } |
| } |