Google Guice的隐藏功能

问题描述

Google Guice提供了一些很大的依赖注入功能。

Google Guice provides some great dependency injection features.

我最近遇到了 @Nullable 功能，允许您将构造函数参数标记为可选（允许null），因为Guice不允许这些参数默认值：

I came across the @Nullable feature recently which allows you to mark constructor arguments as optional (permitting null) since Guice does not permit these by default:

例如

public Person(String firstName, String lastName, @Nullable Phone phone) {
    this.firstName = checkNotNull(firstName, "firstName");
    this.lastName = checkNotNull(lastName, "lastName");
    this.phone = phone;
}

其他的Guice（特别是较不明显的人）使用的有用功能？

What are the other useful features of Guice (particularly the less obvious ones) that people use?

推荐答案

但是这些是我最喜欢的Guice的红利功能：

None of 'em are intended to be hidden, but these are my favorite 'bonus features' in Guice:

• Guice可以，有效地消除了擦除。


• 可以执行：这告诉你，List< String>上的get（）返回Iterator< String>。


• 是Java通用类型接口的实现工厂。


• 可视化注射器。如果您的自定义提供商实施非常方便。


• 用于定义参数化键的简短语法：new Key< List< String>>（）{}。


• 可让您编写错误的扩展名消息正确跟踪行号。


• 。 将一个模块分成原子，将它们放在一起。


• 如果实现了equals（）和hashCode（）在模块中，您可以多次安装该模块，无任何问题。

• Guice can inject a TypeLiteral<T>, effectively defeating erasure.
• TypeLiteral can do generic type resolution: this tells you that get() on a List<String> returns an Iterator<String>.
• Types is a factory for implementations of Java's generic type interfaces.
• Grapher visualizes injectors. If your custom provider implements HasDependencies, it can augment this graph.
• Modules.override() is incredibly handy in a pinch.
• Short syntax for defining parameterized keys: new Key<List<String>>() {}.
• Binder.skipSources() lets you to write extensions whose error messages track line numbers properly.
• The SPI. Elements.getElements() breaks a module into atoms and Elements.getModule() puts them back together.
• If you implement equals() and hashCode() in a Module, you can install that module multiple times without problem.

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