Guice：可以注入模块吗？ [英] Guice: is it possible to inject modules?

问题描述

我有一个需要一些 Depedency 的模块。有没有办法模块本身可以注入？我意识到这是一个鸡和鸡蛋的情况...

I have a Module that requires some Depedency. Is there a way Modules themselves can be injected? I realize this is a bit of a chicken and egg situation...

示例：

public class MyModule implements Module {

    private final Dependency d_;

    @Inject public MyModule(Dependency d) {
        d_ = d;
    }

    public void configure(Binder b) { }

    @Provides Something provideSomething() {
        // this requires d_
    }
}

我想在这种情况下，解决方案是将$ code> @Provides 方法成为一个完整的提供者< Something> 类。这显然是一个简化的例子;我正在处理的代码有许多这样的 @Provides 方法，将它们分成单独的 Provider< ...> 类和引入一个模块来配置它们增加了相当大的混乱 - 我认为Guice都是减少样板杂乱的？

I suppose in this case the solution would be to turn the @Provides method into a full-fledged Provider<Something> class. This is clearly a simplified example; the code I'm dealing with has many such @Provides methods so cutting them each into individual Provider<...> classes and introducing a module to configure them adds a fair amount of clutter - and I thought Guice was all about reducing boilerplate clutter?

也许这反映了我的亲戚对圭的鄙视，但我遇到了一些我以前一直试图做的事情。我必须缺少一些东西...

Perhaps it's a reflection of my relative noobyness to Guice but I've come across a fair few cases where I've been tempted to do the above. I must be missing something...

推荐答案

@Provides 将依赖关系作为参数，就像参数 @Inject 注释的构造函数或方法：

@Provides methods can take dependencies as parameters just like parameters to an @Inject annotated constructor or method:

@Provides Something provideSomething(Dependency d) {
   return new Something(d); // or whatever
}

这是记录的这里，尽管也许可以让人们更加脱颖而出。

This is documented here, though perhaps it could be made to stand out more.

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