| /* |
| * 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 |
| * |
| * https://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.avro.ipc.stats; |
| |
| /** |
| * Specific implementation of histogram for integers, which also keeps track of |
| * basic summary statistics. |
| * |
| * @param <B> |
| */ |
| class IntegerHistogram<B> extends Histogram<B, Integer> { |
| private float runningSum; |
| private float runningSumOfSquares; |
| |
| public IntegerHistogram(Segmenter<B, Integer> segmenter) { |
| super(segmenter); |
| } |
| |
| @Override |
| public void add(Integer value) { |
| super.add(value); |
| runningSum += value; |
| runningSumOfSquares += value * value; |
| } |
| |
| public float getMean() { |
| if (totalCount == 0) { |
| return -1; |
| } |
| return runningSum / (float) totalCount; |
| } |
| |
| public float getUnbiasedStdDev() { |
| if (totalCount <= 1) { |
| return -1; |
| } |
| float mean = getMean(); |
| return (float) Math.sqrt((runningSumOfSquares - totalCount * mean * mean) / (float) (totalCount - 1)); |
| } |
| } |