<?php
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/*
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*
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* Copyright 2017 gRPC authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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// Histogram class for use in performance testing and measurement
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class Histogram {
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private $resolution;
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private $max_possible;
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private $sum;
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private $sum_of_squares;
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private $multiplier;
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private $count;
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private $min_seen;
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private $max_seen;
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private $buckets;
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private function bucket_for($value) {
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return (int)(log($value) / log($this->multiplier));
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}
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public function __construct($resolution, $max_possible) {
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$this->resolution = $resolution;
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$this->max_possible = $max_possible;
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$this->sum = 0;
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$this->sum_of_squares = 0;
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$this->multiplier = 1+$resolution;
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$this->count = 0;
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$this->min_seen = $max_possible;
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$this->max_seen = 0;
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$this->buckets = array_fill(0, $this->bucket_for($max_possible)+1, 0);
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}
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public function add($value) {
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$this->sum += $value;
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$this->sum_of_squares += $value * $value;
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$this->count += 1;
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if ($value < $this->min_seen) {
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$this->min_seen = $value;
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}
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if ($value > $this->max_seen) {
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$this->max_seen = $value;
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}
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$this->buckets[$this->bucket_for($value)] += 1;
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}
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public function minimum() {
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return $this->min_seen;
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}
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public function maximum() {
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return $this->max_seen;
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}
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public function sum() {
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return $this->sum;
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}
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public function sum_of_squares() {
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return $this->sum_of_squares;
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}
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public function count() {
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return $this->count;
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}
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public function contents() {
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return $this->buckets;
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}
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public function clean() {
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$this->sum = 0;
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$this->sum_of_squares = 0;
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$this->count = 0;
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$this->min_seen = $this->max_possible;
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$this->max_seen = 0;
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$this->buckets = array_fill(0, $this->bucket_for($this->max_possible)+1, 0);
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}
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}
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