/** | |
* 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 java.util.concurrent.atomic.AtomicLong; | |
import com.alibaba.jstorm.common.metric.operator.convert.Convertor; | |
import com.alibaba.jstorm.common.metric.operator.merger.AvgMerger2; | |
import com.alibaba.jstorm.common.metric.operator.updater.AvgUpdater2; | |
import com.alibaba.jstorm.common.metric.window.Metric; | |
import com.alibaba.jstorm.utils.Pair; | |
import com.google.common.util.concurrent.AtomicDouble; | |
/** | |
* Meter is used to compute tps | |
* | |
* Attention: 1. | |
* | |
* @author zhongyan.feng | |
* | |
*/ | |
public class Histogram extends Metric<Double, Pair<AtomicDouble, AtomicLong>> { | |
private static final long serialVersionUID = -1362345159511508074L; | |
public Histogram() { | |
defaultValue = | |
new Pair<AtomicDouble, AtomicLong>(new AtomicDouble(0.0), | |
new AtomicLong(0)); | |
updater = new AvgUpdater2(); | |
merger = new AvgMerger2(); | |
convertor = new HistogramConvertor(); | |
init(); | |
} | |
public static class HistogramConvertor implements | |
Convertor<Pair<AtomicDouble, AtomicLong>, Double> { | |
private static final long serialVersionUID = -1569170826785657226L; | |
@Override | |
public Double convert(Pair<AtomicDouble, AtomicLong> from) { | |
// TODO Auto-generated method stub | |
if (from == null) { | |
return 0.0d; | |
} | |
if (from.getSecond().get() == 0) { | |
return 0.0d; | |
} else { | |
return from.getFirst().get() / from.getSecond().get(); | |
} | |
} | |
} | |
} |