在Javascript中缓存和预取即将到期的承诺

本文介绍了在Javascript中缓存和预取即将到期的承诺的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述 29岁程序员，3月因学历无情被辞！ Promise是我在Javascript中管理异步代码的首选方式。 Memoize（npm上的memoizee）是一个用于轻松缓存的Javascript库。预取函数的结果。Promises are my preferred way of managing my asynchronous code in Javascript.Memoize (memoizee on npm) is a Javascript library for easily caching & pre-fetching results of functions.理想情况下，我希望结合两者的优点，并且能够使Promise过期并预先获取新的Promise结果（当触摸缓存并接近到期时）。 Memoize可以做到这一点，但它并没有考虑到Promise。Ideally I want to combine the best of both, and have the ability to "expire" a Promise and pre-fetch a new Promise result (when the cache is touched and near to expiring). Memoize can do this, but it wasn't built with Promises in mind.（我知道Promises有一个内置的永远缓存，因为它们的性质，但永远对于我的应用来说太长了(I understand that Promises have a built-in "forever-cache" as is their nature, but forever is too long for my application)到目前为止我做这个的最佳尝试如下（node.js示例使用 bluebird ， memoize 和下划线）：My best attempt to do this so far is as follows (node.js example using bluebird, memoize and underscore):var memoize = require('memoizee') , Promise = require('bluebird') , _ = require('underscore') ;// returns a memoized Promise-generating functionfunction memoizePromiser(funcReturningPromise, options) { var opts = _.defaults(options || {}, {async: true}); return Promise.promisify(memoize(function(){ var args = _.initial(arguments); var cb = _.last(arguments); funcReturningPromise.apply(this, args).nodeify(cb); }, opts));};这个函数允许我记忆一个异步函数（带有类似节点的回调）返回一个promise，同时还提供了Memoize库提供的所有缓存到期（+更多）功能。This function will allow me to memoize an async function (with node-like callbacks) returning a promise, whilst also providing all the cache-expiry (+ more) functionality offered by the Memoize library.然而，这种方法看起来很混乱，而且过度设计。我想我自己 - 这肯定是一个普遍的问题，而其他人已经提出了一个更优雅的解决方案吗？However, this approach seems messy and over-engineered to me. I think to myself - surely this is a common enough problem hat someone else has made a more elegant solution?这是我尝试做的最好的方法？还有另一个像memoize这样专门为promises设计的库吗？是否有一个我错过的更简单的解决方案？Is this the best approach for what I'm trying to do? Is there another library like memoize which is designed specifically for promises? Is there a simpler solution that I've missed?任何指导都将受到赞赏。Any guidance would be appreciated.推荐答案 这个函数允许我记忆一个异步函数（带有类似节点的回调）返回一个promise。然而，这种方法看起来很混乱并且过度设计了。 This function will allow me to memoize an async function (with node-like callbacks) returning a promise. However, this approach seems messy and over-engineered to me.是的 - 你已经有一个函数返回一个promise，没有回到nodebacks的原因。Yes - you already have a function returning a promise, there is no reason to go back to nodebacks. 我错过了一个更简单的解决方案吗？ Is there a simpler solution that I've missed?返回promise的函数只是一个返回某个值的函数 - 一个可以通过 memoize缓存的值功能。只需A function that returns a promise is just a function that returns some value - a value that can be cached by the memoize function. Simply domemoize(funcReturningPromise, options) 这篇关于在Javascript中缓存和预取即将到期的承诺的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！ 上岸，阿里云！