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| 1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
| 4 | 4 |
| 5 /** | 5 /** |
| 6 * @fileoverview | 6 * @fileoverview |
| 7 * The webapp reads the plugin's connection statistics frequently (once per | 7 * The webapp reads the plugin's connection statistics frequently (once per |
| 8 * second). It logs statistics to the server less frequently, to keep | 8 * second). It logs statistics to the server less frequently, to keep |
| 9 * bandwidth and storage costs down. This class bridges that gap, by | 9 * bandwidth and storage costs down. This class bridges that gap, by |
| 10 * accumulating high-frequency numeric data, and providing statistics | 10 * accumulating high-frequency numeric data, and providing statistics |
| 11 * summarising that data. | 11 * summarising that data. |
| 12 */ | 12 */ |
| 13 | 13 |
| 14 'use strict'; | 14 'use strict'; |
| 15 | 15 |
| 16 /** @suppress {duplicate} */ | 16 /** @suppress {duplicate} */ |
| 17 var remoting = remoting || {}; | 17 var remoting = remoting || {}; |
| 18 | 18 |
| 19 /** | 19 /** |
| 20 * @constructor | 20 * @constructor |
| 21 */ | 21 */ |
| 22 remoting.StatsAccumulator = function() { | 22 remoting.StatsAccumulator = function() { |
| 23 /** | 23 /** |
| 24 * A map from names to lists of values. | 24 * A map from names to lists of values. |
| 25 * @private | 25 * @private |
| 26 * @type Object.<string, Array.<number>> | 26 * @type Object<string, Array<number>> |
| 27 */ | 27 */ |
| 28 this.valueLists_ = {}; | 28 this.valueLists_ = {}; |
| 29 | 29 |
| 30 /** | 30 /** |
| 31 * The first time, after this object was most recently initialized or emptied, | 31 * The first time, after this object was most recently initialized or emptied, |
| 32 * at which a value was added to this object. | 32 * at which a value was added to this object. |
| 33 * @private | 33 * @private |
| 34 * @type {?number} | 34 * @type {?number} |
| 35 */ | 35 */ |
| 36 this.timeOfFirstValue_ = null; | 36 this.timeOfFirstValue_ = null; |
| 37 }; | 37 }; |
| 38 | 38 |
| 39 /** | 39 /** |
| 40 * Adds values to this object. | 40 * Adds values to this object. |
| 41 * | 41 * |
| 42 * @param {Object.<string, number>} newValues | 42 * @param {Object<string, number>} newValues |
| 43 */ | 43 */ |
| 44 remoting.StatsAccumulator.prototype.add = function(newValues) { | 44 remoting.StatsAccumulator.prototype.add = function(newValues) { |
| 45 for (var key in newValues) { | 45 for (var key in newValues) { |
| 46 this.getValueList(key).push(newValues[key]); | 46 this.getValueList(key).push(newValues[key]); |
| 47 } | 47 } |
| 48 if (!this.timeOfFirstValue_) { | 48 if (!this.timeOfFirstValue_) { |
| 49 this.timeOfFirstValue_ = new Date().getTime(); | 49 this.timeOfFirstValue_ = new Date().getTime(); |
| 50 } | 50 } |
| 51 }; | 51 }; |
| 52 | 52 |
| (...skipping 19 matching lines...) Expand all Loading... |
| 72 }; | 72 }; |
| 73 | 73 |
| 74 /** | 74 /** |
| 75 * Calculates the mean of the values for a given key. | 75 * Calculates the mean of the values for a given key. |
| 76 * | 76 * |
| 77 * @param {string} key | 77 * @param {string} key |
| 78 * @return {number} the mean of the values for that key | 78 * @return {number} the mean of the values for that key |
| 79 */ | 79 */ |
| 80 remoting.StatsAccumulator.prototype.calcMean = function(key) { | 80 remoting.StatsAccumulator.prototype.calcMean = function(key) { |
| 81 /** | 81 /** |
| 82 * @param {Array.<number>} values | 82 * @param {Array<number>} values |
| 83 * @return {number} | 83 * @return {number} |
| 84 */ | 84 */ |
| 85 var calcMean = function(values) { | 85 var calcMean = function(values) { |
| 86 if (values.length == 0) { | 86 if (values.length == 0) { |
| 87 return 0.0; | 87 return 0.0; |
| 88 } | 88 } |
| 89 var sum = 0; | 89 var sum = 0; |
| 90 for (var i = 0; i < values.length; i++) { | 90 for (var i = 0; i < values.length; i++) { |
| 91 sum += values[i]; | 91 sum += values[i]; |
| 92 } | 92 } |
| 93 return sum / values.length; | 93 return sum / values.length; |
| 94 }; | 94 }; |
| 95 return this.map(key, calcMean); | 95 return this.map(key, calcMean); |
| 96 }; | 96 }; |
| 97 | 97 |
| 98 /** | 98 /** |
| 99 * Applies a given map to the list of values for a given key. | 99 * Applies a given map to the list of values for a given key. |
| 100 * | 100 * |
| 101 * @param {string} key | 101 * @param {string} key |
| 102 * @param {function(Array.<number>): number} map | 102 * @param {function(Array<number>): number} map |
| 103 * @return {number} the result of applying that map to the list of values for | 103 * @return {number} the result of applying that map to the list of values for |
| 104 * that key | 104 * that key |
| 105 */ | 105 */ |
| 106 remoting.StatsAccumulator.prototype.map = function(key, map) { | 106 remoting.StatsAccumulator.prototype.map = function(key, map) { |
| 107 return map(this.getValueList(key)); | 107 return map(this.getValueList(key)); |
| 108 }; | 108 }; |
| 109 | 109 |
| 110 /** | 110 /** |
| 111 * Gets the list of values for a given key. | 111 * Gets the list of values for a given key. |
| 112 * If this object contains no values for that key, then this routine creates | 112 * If this object contains no values for that key, then this routine creates |
| 113 * an empty list, stores it in this object, and returns it. | 113 * an empty list, stores it in this object, and returns it. |
| 114 * | 114 * |
| 115 * @private | 115 * @private |
| 116 * @param {string} key | 116 * @param {string} key |
| 117 * @return {Array.<number>} the list of values for that key | 117 * @return {Array<number>} the list of values for that key |
| 118 */ | 118 */ |
| 119 remoting.StatsAccumulator.prototype.getValueList = function(key) { | 119 remoting.StatsAccumulator.prototype.getValueList = function(key) { |
| 120 var valueList = this.valueLists_[key]; | 120 var valueList = this.valueLists_[key]; |
| 121 if (!valueList) { | 121 if (!valueList) { |
| 122 valueList = []; | 122 valueList = []; |
| 123 this.valueLists_[key] = valueList; | 123 this.valueLists_[key] = valueList; |
| 124 } | 124 } |
| 125 return valueList; | 125 return valueList; |
| 126 }; | 126 }; |
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