1 <?php 2 /* 3 * 4 * Copyright 2017 gRPC authors. 5 * 6 * Licensed under the Apache License, Version 2.0 (the "License"); 7 * you may not use this file except in compliance with the License. 8 * You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, software 13 * distributed under the License is distributed on an "AS IS" BASIS, 14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 * See the License for the specific language governing permissions and 16 * limitations under the License. 17 * 18 */ 19 20 // Histogram class for use in performance testing and measurement 21 class Histogram { 22 private $resolution; 23 private $max_possible; 24 private $sum; 25 private $sum_of_squares; 26 private $multiplier; 27 private $count; 28 private $min_seen; 29 private $max_seen; 30 private $buckets; 31 32 private function bucket_for($value) { 33 return (int)(log($value) / log($this->multiplier)); 34 } 35 36 public function __construct($resolution, $max_possible) { 37 $this->resolution = $resolution; 38 $this->max_possible = $max_possible; 39 $this->sum = 0; 40 $this->sum_of_squares = 0; 41 $this->multiplier = 1+$resolution; 42 $this->count = 0; 43 $this->min_seen = $max_possible; 44 $this->max_seen = 0; 45 $this->buckets = array_fill(0, $this->bucket_for($max_possible)+1, 0); 46 } 47 48 public function add($value) { 49 $this->sum += $value; 50 $this->sum_of_squares += $value * $value; 51 $this->count += 1; 52 if ($value < $this->min_seen) { 53 $this->min_seen = $value; 54 } 55 if ($value > $this->max_seen) { 56 $this->max_seen = $value; 57 } 58 $this->buckets[$this->bucket_for($value)] += 1; 59 } 60 61 public function minimum() { 62 return $this->min_seen; 63 } 64 65 public function maximum() { 66 return $this->max_seen; 67 } 68 69 public function sum() { 70 return $this->sum; 71 } 72 73 public function sum_of_squares() { 74 return $this->sum_of_squares; 75 } 76 77 public function count() { 78 return $this->count; 79 } 80 81 public function contents() { 82 return $this->buckets; 83 } 84 85 public function clean() { 86 $this->sum = 0; 87 $this->sum_of_squares = 0; 88 $this->count = 0; 89 $this->min_seen = $this->max_possible; 90 $this->max_seen = 0; 91 $this->buckets = array_fill(0, $this->bucket_for($this->max_possible)+1, 0); 92 } 93 } 94
