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core: refine preset creation, remove reset()

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Micooz 2017-11-24 14:20:18 +08:00
parent 3cd3a6fafa
commit beb84d4e2c
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GPG Key ID: B100C9A159B1EBA0
1 changed files with 11 additions and 27 deletions
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38
src/core/middleware.js
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@ -2,33 +2,28 @@ import EventEmitter from 'events';
import {getPresetClassByName, IPresetStatic} from '../presets';
import {kebabCase} from '../utils';
let presetCache = {
// 'ClassName': <preset>
};
const staticPresetCache = new Map(/* 'ClassName': <preset> */);
function getInstanceFromCache(ImplClass, params) {
let impl = presetCache[ImplClass.name];
if (impl === undefined) {
let preset = staticPresetCache.get(ImplClass.name);
if (preset === undefined) {
// only create one instance for IPresetStatic
ImplClass.checkParams(params);
ImplClass.onInit(params);
impl = new ImplClass(params);
presetCache[ImplClass.name] = impl;
preset = new ImplClass(params);
staticPresetCache.set(ImplClass.name, preset);
}
return impl;
return preset;
}
function createPreset(name, params = {}) {
const ImplClass = getPresetClassByName(name);
let preset = null;
if (ImplClass.__proto__.name === IPresetStatic.name) {
if (IPresetStatic.isPrototypeOf(ImplClass)) {
preset = getInstanceFromCache(ImplClass, params);
} else {
if (!ImplClass.initialized) {
ImplClass.checkParams(params);
ImplClass.onInit(params);
ImplClass.initialized = true;
}
ImplClass.checkParams(params);
ImplClass.onInit(params);
preset = new ImplClass(params);
}
return preset;
@ -136,18 +131,7 @@ export class Middleware extends EventEmitter {
* destroy cached presets when program exit()
*/
export function cleanup() {
const classNames = Object.keys(presetCache);
for (const className of classNames) {
presetCache[className].onDestroy();
for (const preset of staticPresetCache.values()) {
preset.onDestroy();
}
}
/**
* clear preset cache and reset them to fresh status
*/
export function reset() {
presetCache = {};
__PRESETS__
.map(({name}) => getPresetClassByName(name))
.forEach((ImplClass) => ImplClass.initialized = false);
}