让Cordova等待异步钩完成 [英] Make Cordova wait for async hook to finish

问题描述

在我的Cordova项目中，我有一个钩子在 after_prepare 上执行RequireJS优化（r.js）。该优化本质上是异步的，因此我的挂钩代码会在所有优化完全完成之前返回。

In my Cordova project, I have a hook which does RequireJS optimization (r.js) on after_prepare. That optimization is inherently asynchronous, so my hook code returns before all optimization is fully finished.

例如，这会在运行 cordova运行浏览器时引起问题：在首页加载过程中，优化尚未完成，站点看上去也很破损。

For example, this causes issues when running cordova run browser: On the first page load, optimization has not finished yet and the site looks broken.

是否有一种方法可以使Cordovoa构建过程阻止直到某个钩子触发回调？还是可以以阻塞/同步的方式运行优化器？

Is there a way to make the Cordovoa build process to block until a certain hook fires a callback? Or can the optimizer be run in a blocking/sync way?

我能想到的另一种方法是使用不同的过程进行优化，并在主进程中进行繁忙等待可以完成，但是对我来说似乎是一个矫kill过正和不好的做法。

An alternative I could think of is using a different process for optimization and busy-wait in the main for it to finish, but that looks like an overkill and bad practice to me.

推荐答案

您可以使用内置的promise模块来阻止Cordova继续进行，直到问题解决为止。
遵循以下原则：

You can use the built-in promise module to block Cordova from proceeding until the hook has resolved. Something along these lines:

#!/usr/bin/env node

var deferral;

function doSomethingAsync(){
    somethingAync
        .success(function(){
            deferral.resolve();
        })
        .fail(function(err){
            deferral.reject(err);
        });
}

module.exports = function(ctx) {
    deferral = ctx.requireCordovaModule('q').defer();
    doSomethingAsync();
    return deferral.promise;
};

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