丹尼尔:蛋兄,咱们明天聊些什么呢?
蛋学生:明天就来聊下 webpack 中插件零碎实现的要害 - Tapable
丹尼尔:Tapable?
蛋学生:没错,咱们明天换种形式来聊吧,就聊你的一天
丹尼尔:我的一天?
蛋学生:首先,每个人的一天都有这么几个阶段:早上,中午,下午,早晨。用 Tapable 的形式形容是以下这个样子:
const { SyncHook } = require("tapable");class Man { constructor() { this.hooks = { morningHook: new SyncHook(), noonHook: new SyncHook(), afternoonHook: new SyncHook(), nightHook: new SyncHook(), }; } startNewDay() { this.hooks.morningHook.call(); this.hooks.noonHook.call(); this.hooks.afternoonHook.call(); this.hooks.nightHook.call(); }}
丹尼尔:SyncHook 是啥?
蛋学生:先不焦急,等会你就会明确的。首先你是一个人。
丹尼尔:不然呢?难道还会是禽兽吗?(`へ´)
蛋学生:(lll¬¬) 误会误会,看看代码吧
const daniel = new Man();daniel.startNewDay();
丹尼尔:哦,懂了。那我的一天都筹备干些啥呢?
蛋学生:首先是早上,早上你就做了三件事:起床,刷牙,吃早餐
丹尼尔:就这?还认为有什么惊喜呢
蛋学生:我又不是讲段子的 ╮(╯▽╰)╭,我只会讲代码,来
const daniel = new Man();// MorninggetUpAction(daniel);brushTeethAction(daniel);eatBreakfastAction(daniel);daniel.startNewDay();function getUpAction(manInst) { manInst.hooks.morningHook.tap("getUp", () => console.log("Get up"));}function brushTeethAction(manInst) { manInst.hooks.morningHook.tap("brushTeeth", () => console.log("Brush Teeth"));}function eatBreakfastAction(manInst) { manInst.hooks.morningHook.tap("eatBreakfast", () => console.log("Eat breakfast") );}
输入后果:
Get upBrush TeethEat breakfast
丹尼尔:我如同看出点什么了,Man 只是定义了生命周期钩子,但每个阶段做什么,都是通过减少行为来灵便扩大(PS:这里的行为你能够了解为插件,只是为了配合这个剧本而已)
蛋学生:是的没错。这里的起床,刷牙等行为,彼此间独立,且都是同步程序执行的,所以咱们只用一般的同步 Hook 就行了,即 SyncHook。
class Man { constructor() { this.hooks = { morningHook: new SyncHook(), ... }; } startNewDay() { this.hooks.morningHook.call(); ... }}
丹尼尔:这里的 this.hooks.morningHook.call()
就是告诉早上这个周期阶段开始了,而后后面各个 Action 通过 manInst.hooks.morningHook.tap
曾经提前注册好要在这个周期做些什么,所以此时各个 Action 也就繁忙起来了是吧
蛋学生:Yes。后面你不是问了 SyncHook 吗?因为行为有同步和异步,所以 Sync 结尾的 Hook 就是同步执行的,而 Async 结尾的就是异步执行的
丹尼尔:原来如此,那一个周期阶段上挂这么多行为,是不是要期待所有行为完结才进到下个周期阶段
蛋学生:是的没错。一个周期阶段上能够挂多个行为,个别先挂先执行(SyncXXX 和 AsyncSeriesXXX),还有一种是并发执行,当然也只有异步行为能力并发。接下来咱们持续通过你的一天来理解 Tapable 的各种 Hook 及其它信息吧
丹尼尔:好的,早上聊完了,中午干啥呢?
蛋学生:不不,还是早上。咱们略微调整下早上做的事,换成起床,做早餐,吃早餐
丹尼尔:额,还是一样平平无奇啊
蛋学生:你在做早餐时搞砸了
丹尼尔:啊,这么晦气?那我岂不是要饿肚子了 X﹏X
蛋学生:做早餐实现不了,意味着吃早餐须要中断,这个时候就须要 SyncBailHook
const { SyncBailHook } = require("tapable");class Man { constructor() { this.hooks = { morningHook: new SyncBailHook(), ... }; } ...}const daniel = new Man();// MorninggetUpAction(daniel);makeBreakfastAction(daniel);eatBreakfastAction(daniel);daniel.startNewDay();function getUpAction(manInst) { manInst.hooks.morningHook.tap("getUp", () => console.log("Get up"));}function makeBreakfastAction(manInst) { manInst.hooks.morningHook.tap("makeBreakfast", () => { console.log("Make breakfast, but failed"); return false; });}function eatBreakfastAction(manInst) { manInst.hooks.morningHook.tap("eatBreakfast", () => console.log("Eat breakfast") );}
输入后果
Get upMake breakfast, but failed
丹尼尔:好吧,吃不了就算了,只能挨饿到中午了
蛋学生:早餐不吃对身材不好,我改下剧情。你胜利地做完早餐,做了牛奶,鸡蛋和面包。但咱们须要把做早餐的成绩给到吃早餐,这样吃早餐才有货色能够吃,这时就能够用 SyncWaterfallHook
const { SyncWaterfallHook } = require("tapable");class Man { constructor() { this.hooks = { morningHook: new SyncWaterfallHook(["breakfast"]), ... }; } ...}function makeBreakfastAction(manInst) { manInst.hooks.morningHook.tap("makeBreakfast", () => { console.log("Make breakfast"); return "milk, bread, eggs"; });}function eatBreakfastAction(manInst) { manInst.hooks.morningHook.tap("eatBreakfast", (breakfast) => console.log("Eat breakfast: ", breakfast) );}
输入后果:
Get upMake breakfastEat breakfast: milk, bread, eggs
丹尼尔:谢了蛋兄,对我真不错。早餐也吃完了,要到中午了吗?
蛋学生:是的,中午到了,你又开始做饭了
丹尼尔:啊,我就是个吃货啊,煮啥呢?
蛋学生:你一边煮饭一边煲汤。
丹尼尔:一边...一边...,那就是同时做两件事啊
蛋学生:是的,什么行为能够同时做,当然是异步行为啦,这时就能够用 AsyncParallelHook 了
const { AsyncParallelHook } = require("tapable");class Man { constructor() { this.hooks = { ... noonHook: new AsyncParallelHook(), ... }; } async startNewDay() { ... await this.hooks.noonHook.promise(); ... }}const daniel = new Man();// Morning...// NoonsoupAction(daniel);cookRiceAction(daniel);daniel.startNewDay();...function cookRiceAction(manInst) { manInst.hooks.noonHook.tapPromise("cookRice", () => { console.log("cookRice starting..."); return new Promise((resolve) => { setTimeout(() => { console.log("cookRice finishing..."); resolve(); }, 800); }); });}function soupAction(manInst) { manInst.hooks.noonHook.tapPromise("soup", () => { console.log("soup starting..."); return new Promise((resolve) => { setTimeout(() => { console.log("soup finishing..."); resolve(); }, 1000); }); });}
输入如下:
soup starting...cookRice starting...cookRice finishing...soup finishing...
丹尼尔:好吧,中午看上去比早上顺利多了
蛋学生:接下来到下午了,下午你开始用番茄工作法学习四个小时
丹尼尔:恩,你又晓得我这么好学,真是太理解我了
蛋学生:因为一个番茄钟一直地循环,直到 4 小时过来才完结,所以能够用到 SyncLoopHook
const { SyncLoopHook } = require("tapable");class Man { constructor() { this.hooks = { ... afternoonHook: new SyncLoopHook(), ... }; } async startNewDay() { ... this.hooks.afternoonHook.call(); ... }}const daniel = new Man();// Morning...// Noon...// AfternoonstudyAction(daniel);restAction(daniel)daniel.startNewDay();...let leftTime = 4 * 60;function studyAction(manInst) { manInst.hooks.afternoonHook.tap("study", () => { console.log("study 25 minutes"); leftTime -= 25; });}function restAction(manInst) { manInst.hooks.afternoonHook.tap("study", () => { console.log("rest 5 minutes"); leftTime -= 5; if (leftTime <= 0) { console.log("tomatoStudy: finish"); return; } return true; });}
输入后果:
study 25 minutesrest 5 minutesstudy 25 minutesrest 5 minutesstudy 25 minutesrest 5 minutesstudy 25 minutesrest 5 minutesstudy 25 minutesrest 5 minutesstudy 25 minutesrest 5 minutesstudy 25 minutesrest 5 minutesstudy 25 minutesrest 5 minutestomatoStudy: finish
丹尼尔:学到头昏脑涨的,早晨该放松放松了
蛋学生:恩,到了早晨了,你可能玩游戏,也可能看电影,这取决于有没敌人找你上分
丹尼尔:哦,就是看状况而定,不是所有行为都执行是吧
蛋学生:是的,这就须要用到 HookMap
const { SyncHook, HookMap } = require("tapable");class Man { constructor() { this.hooks = { ... nightHook: new HookMap(() => new SyncHook()), }; } async startNewDay() { ... this.hooks.nightHook.for("no friend invitation").call(); }}const daniel = new Man();// Morning...// Noon...// Afternoon...// NightplayGameAction(daniel);watchMovieAction(daniel);daniel.startNewDay();...function playGameAction(manInst) { manInst.hooks.nightHook.for("friend invitation").tap("playGame", () => { console.log("play game"); });}function watchMovieAction(manInst) { manInst.hooks.nightHook.for("no friend invitation").tap("watchMovie", () => { console.log("watch movie"); });}
输入后果:
watch movie
丹尼尔:一天就这么过完了,咱们该说再见了
蛋学生:还没完,你有写日记的好习惯,而且是每做一件事就记
丹尼尔:每一件都记?这是记流水账吧
蛋学生:差不多吧,你感觉怎么记最好呢
丹尼尔:做每件事之前进行拦挡咯
蛋学生:真聪慧,这里能够用 Interception
...const daniel = new Man();writeDiary(daniel);...daniel.startNewDay();...function writeDiary(manInst) { const interceptFn = (hookName) => { return { tap: (tapInfo) => { console.log(`write diary:`, tapInfo) } }; }; Object.keys(manInst.hooks).forEach((hookName) => { if (manInst.hooks[hookName] instanceof HookMap) { manInst.hooks[hookName].intercept({ factory: (key, hook) => { hook.intercept(interceptFn(hookName)); return hook }, }); } else { manInst.hooks[hookName].intercept(interceptFn(hookName)); } });}
输入后果:
write diary: { type: 'sync', fn: [Function], name: 'getUp' }write diary: { type: 'sync', fn: [Function], name: 'makeBreakfast' }write diary: { type: 'sync', fn: [Function], name: 'eatBreakfast' }write diary: { type: 'promise', fn: [Function], name: 'soup' }write diary: { type: 'promise', fn: [Function], name: 'cookRice' }write diary: { type: 'sync', fn: [Function], name: 'study' }write diary: { type: 'sync', fn: [Function], name: 'study' }write diary: { type: 'sync', fn: [Function], name: 'study' }write diary: { type: 'sync', fn: [Function], name: 'study' }write diary: { type: 'sync', fn: [Function], name: 'study' }write diary: { type: 'sync', fn: [Function], name: 'study' }write diary: { type: 'sync', fn: [Function], name: 'study' }write diary: { type: 'sync', fn: [Function], name: 'study' }write diary: { type: 'sync', fn: [Function], name: 'watchMovie' }
丹尼尔:日记也写完了,没啥其它事了吧
蛋学生:最初的最初,聊一下 context 吧。因为每个行为都可能由不同的开发者提供,行为之间独立,但有时又想共享一些数据,比方这里须要共享下你的个人信息,再看最初的一段代码,而后就能够散了,再保持一小会
...const daniel = new Man();writeDiary(daniel);...daniel.startNewDay();function getUpAction(manInst) { manInst.hooks.morningHook.tap( { name: "getUp", context: true, }, (context) => { console.log("Get up", context); } );}...function writeDiary(manInst) { const interceptFn = (hookName) => { return { context: true, tap: (context, tapInfo) => { context = context || {}; context.userInfo = { name: "daniel", }; } }; }; Object.keys(manInst.hooks).forEach((hookName) => { if (manInst.hooks[hookName] instanceof HookMap) { manInst.hooks[hookName].intercept({ factory: (key, hook) => { console.log(`[${hookName}][${key}]`); hook.intercept(interceptFn(hookName)); return hook; }, }); } else { manInst.hooks[hookName].intercept(interceptFn(hookName)); } });}
输入后果:
Get up { userInfo: { name: 'daniel' } }
丹尼尔:好困,眼睛快要睁不开了
蛋学生:好了,你的一天就聊完了,再见
丹尼尔:告辞
保持读到这里的小伙伴们,你们通过 Tapable 会怎么定制你的一天的呢?