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feat: performance improvement for eventListeners (#34613) 

PR Close #34613
This commit is contained in:
JiaLiPassion 2020-01-02 22:59:20 +09:00 committed by Miško Hevery
parent 4d36b2f6e9
commit a3c7ab99b7
1 changed files with 39 additions and 25 deletions
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44
packages/zone.js/lib/common/events.ts
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@ -44,6 +44,16 @@ export const globalSources: any = {};
const EVENT_NAME_SYMBOL_REGX = new RegExp('^' + ZONE_SYMBOL_PREFIX + '(\\w+)(true|false)$');
const IMMEDIATE_PROPAGATION_SYMBOL = zoneSymbol('propagationStopped');
function prepareEventNames(eventName: string, eventNameToString?: (eventName: string) => string) {
const falseEventName = (eventNameToString ? eventNameToString(eventName) : eventName) + FALSE_STR;
const trueEventName = (eventNameToString ? eventNameToString(eventName) : eventName) + TRUE_STR;
const symbol = ZONE_SYMBOL_PREFIX + falseEventName;
const symbolCapture = ZONE_SYMBOL_PREFIX + trueEventName;
zoneSymbolEventNames[eventName] = {};
zoneSymbolEventNames[eventName][FALSE_STR] = symbol;
zoneSymbolEventNames[eventName][TRUE_STR] = symbolCapture;
}
export interface PatchEventTargetOptions {
// validateHandler
vh?: (nativeDelegate: any, delegate: any, target: any, args: any) => boolean;
@ -387,23 +397,12 @@ export function patchEventTarget(
}
const zone = Zone.current;
const symbolEventNames = zoneSymbolEventNames[eventName];
let symbolEventName;
let symbolEventNames = zoneSymbolEventNames[eventName];
if (!symbolEventNames) {
// the code is duplicate, but I just want to get some better performance
const falseEventName =
(eventNameToString ? eventNameToString(eventName) : eventName) + FALSE_STR;
const trueEventName =
(eventNameToString ? eventNameToString(eventName) : eventName) + TRUE_STR;
const symbol = ZONE_SYMBOL_PREFIX + falseEventName;
const symbolCapture = ZONE_SYMBOL_PREFIX + trueEventName;
zoneSymbolEventNames[eventName] = {};
zoneSymbolEventNames[eventName][FALSE_STR] = symbol;
zoneSymbolEventNames[eventName][TRUE_STR] = symbolCapture;
symbolEventName = capture ? symbolCapture : symbol;
} else {
symbolEventName = symbolEventNames[capture ? TRUE_STR : FALSE_STR];
prepareEventNames(eventName, eventNameToString);
symbolEventNames = zoneSymbolEventNames[eventName];
}
const symbolEventName = symbolEventNames[capture ? TRUE_STR : FALSE_STR];
let existingTasks = target[symbolEventName];
let isExisting = false;
if (existingTasks) {
@ -668,6 +667,7 @@ export function patchEventTarget(
}
export function findEventTasks(target: any, eventName: string): Task[] {
if (!eventName) {
const foundTasks: any[] = [];
for (let prop in target) {
const match = EVENT_NAME_SYMBOL_REGX.exec(prop);
@ -683,6 +683,20 @@ export function findEventTasks(target: any, eventName: string): Task[] {
}
return foundTasks;
}
let symbolEventName = zoneSymbolEventNames[eventName];
if (!symbolEventName) {
prepareEventNames(eventName);
symbolEventName = zoneSymbolEventNames[eventName];
}
const captureFalseTasks = target[symbolEventName[FALSE_STR]];
const captureTrueTasks = target[symbolEventName[TRUE_STR]];
if (!captureFalseTasks) {
return captureTrueTasks ? captureTrueTasks.slice() : [];
} else {
return captureTrueTasks ? captureFalseTasks.concat(captureTrueTasks) :
captureFalseTasks.slice();
}
}
export function patchEventPrototype(global: any, api: _ZonePrivate) {
const Event = global['Event'];