| /* |
| * 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.flink.runtime.checkpoint; |
| |
| import java.io.Serializable; |
| |
| /** |
| * Helper for keeping track of min/max/average summaries. |
| */ |
| public class MinMaxAvgStats implements Serializable { |
| |
| private static final long serialVersionUID = 1769601903483446707L; |
| |
| /** Current min value. */ |
| private long min; |
| |
| /** Current max value. */ |
| private long max; |
| |
| /** Sum of all added values. */ |
| private long sum; |
| |
| /** Count of added values. */ |
| private long count; |
| |
| MinMaxAvgStats() { |
| } |
| |
| private MinMaxAvgStats(long min, long max, long sum, long count) { |
| this.min = min; |
| this.max = max; |
| this.sum = sum; |
| this.count = count; |
| } |
| |
| /** |
| * Adds the value to the stats if it is >= 0. |
| * |
| * @param value Value to add for min/max/avg stats.. |
| */ |
| void add(long value) { |
| if (value >= 0) { |
| if (count > 0) { |
| min = Math.min(min, value); |
| max = Math.max(max, value); |
| } else { |
| min = value; |
| max = value; |
| } |
| |
| count++; |
| sum += value; |
| } |
| } |
| |
| /** |
| * Returns a snapshot of the current state. |
| * |
| * @return A snapshot of the current state. |
| */ |
| MinMaxAvgStats createSnapshot() { |
| return new MinMaxAvgStats(min, max, sum, count); |
| } |
| |
| /** |
| * Returns the minimum seen value. |
| * |
| * @return The current minimum value. |
| */ |
| public long getMinimum() { |
| return min; |
| } |
| |
| /** |
| * Returns the maximum seen value. |
| * |
| * @return The current maximum value. |
| */ |
| public long getMaximum() { |
| return max; |
| } |
| |
| /** |
| * Returns the sum of all seen values. |
| * |
| * @return Sum of all values. |
| */ |
| public long getSum() { |
| return sum; |
| } |
| |
| /** |
| * Returns the count of all seen values. |
| * |
| * @return Count of all values. |
| */ |
| public long getCount() { |
| return count; |
| } |
| |
| /** |
| * Calculates the average over all seen values. |
| * |
| * @return Average over all seen values. |
| */ |
| public long getAverage() { |
| if (count == 0) { |
| return 0; |
| } else { |
| return sum / count; |
| } |
| } |
| |
| } |