angular-cn/packages/zone.js/example/benchmarks/event_emitter.js

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/**
* @license
* Copyright Google Inc. All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
const events = require('events');
const EventEmitter = events.EventEmitter;
require('../../dist/zone-node');
const emitters = [];
const callbacks = [];
const size = 100000;
for (let i = 0; i < size; i++) {
const emitter = new EventEmitter();
const callback = (function(i) { return function() { console.log(i); }; })(i);
emitters[i] = emitter;
callbacks[i] = callback;
}
function addRemoveCallback(reuse, useZone) {
const start = new Date();
let callback = callbacks[0];
for (let i = 0; i < size; i++) {
const emitter = emitters[i];
if (!reuse) callback = callbacks[i];
if (useZone)
emitter.on('msg', callback);
else
emitter.__zone_symbol__addListener('msg', callback);
}
for (let i = 0; i < size; i++) {
const emitter = emitters[i];
if (!reuse) callback = callbacks[i];
if (useZone)
emitter.removeListener('msg', callback);
else
emitter.__zone_symbol__removeListener('msg', callback);
}
const end = new Date();
console.log(useZone ? 'use zone' : 'native', reuse ? 'reuse' : 'new');
console.log('Execution time: %dms', end - start);
}
addRemoveCallback(false, false);
addRemoveCallback(false, true);
addRemoveCallback(true, false);
addRemoveCallback(true, true);