92 lines
2.2 KiB
JavaScript
92 lines
2.2 KiB
JavaScript
/*\
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title: $:/core/modules/utils/performance.js
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type: application/javascript
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module-type: global
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Performance measurement.
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\*/
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(function(){
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/*jslint node: true, browser: true */
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/*global $tw: false */
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"use strict";
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function Performance(enabled) {
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this.enabled = !!enabled;
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this.measures = {}; // Hashmap by measurement name of {time:, invocations:}
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this.logger = new $tw.utils.Logger("performance");
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this.showGreeting();
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}
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Performance.prototype.showGreeting = function() {
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if($tw.browser) {
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this.logger.log("Execute $tw.perf.log(); to see filter execution timings");
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}
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};
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/*
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Wrap performance reporting around a top level function
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*/
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Performance.prototype.report = function(name,fn) {
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var self = this;
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if(this.enabled) {
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return function() {
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var startTime = $tw.utils.timer(),
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result = fn.apply(this,arguments);
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self.logger.log(name + ": " + $tw.utils.timer(startTime).toFixed(2) + "ms");
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return result;
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};
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} else {
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return fn;
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}
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};
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Performance.prototype.log = function() {
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var self = this,
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totalTime = 0,
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orderedMeasures = Object.keys(this.measures).sort(function(a,b) {
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if(self.measures[a].time > self.measures[b].time) {
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return -1;
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} else if (self.measures[a].time < self.measures[b].time) {
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return + 1;
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} else {
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return 0;
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}
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});
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$tw.utils.each(orderedMeasures,function(name) {
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totalTime += self.measures[name].time;
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});
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var results = []
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$tw.utils.each(orderedMeasures,function(name) {
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var measure = self.measures[name];
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results.push({name: name,invocations: measure.invocations, avgTime: measure.time / measure.invocations, totalTime: measure.time, percentTime: (measure.time / totalTime) * 100})
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});
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self.logger.table(results);
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};
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/*
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Wrap performance measurements around a subfunction
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*/
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Performance.prototype.measure = function(name,fn) {
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var self = this;
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if(this.enabled) {
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return function() {
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var startTime = $tw.utils.timer(),
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result = fn.apply(this,arguments);
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if(!(name in self.measures)) {
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self.measures[name] = {time: 0, invocations: 0};
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}
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self.measures[name].time += $tw.utils.timer(startTime);
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self.measures[name].invocations++;
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return result;
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};
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} else {
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return fn;
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}
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};
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exports.Performance = Performance;
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})();
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