/**
* 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 com.alibaba.jstorm.common.metric;
import backtype.storm.GCState;
import com.codahale.metrics.Gauge;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* @author JohnFang (xiaojian.fxj@alibaba-inc.com).
*/
public class FullGcGauge implements Gauge<Double> {
private static final Logger LOG = LoggerFactory.getLogger(FullGcGauge.class);
private double lastFGcNum = 0.0;
@Override
public Double getValue() {
double newFGcNum = GCState.getOldGenCollectionCount();
double delta = newFGcNum - lastFGcNum;
if (delta < 0){
LOG.warn("new Fgc {} little than old oldFgc {}", newFGcNum, lastFGcNum);
delta = 0;
}
lastFGcNum = newFGcNum;
return delta;
}
}