注射器如何注射？ [英] How to inject Injector?

问题描述

情况：我需要一些 FooClass 中的惰性依赖关系实例化，所以我通过 Injector 作为构造函数参数。

  private final注射器m_injector; 
 
 public FooClass（@Named（FooInjector）注射器注射器）{
 m_injector = 
} 
  

但是，guice不允许绑定核心类（注入器，模块等） ）。什么是解决方案？

解决方案

您不应该使用 Injector 直。而是转而使用提供者< FooClass> 。此外，您应该在您使用 FooClass 的地方注入提供程序。

  private final Provider&FooClass>供应商; 
 
 @Inject 
 public ClassWhereFooIsUsed（Provider&FooClass> provider）{
 this.provider = provider; 
} 
 
 ....别的地方
 FooClass f = provider.get（）; //这是懒惰
  

Situation: i need lazy dependency instantiation in some FooClass, so i pass Injector to class as a constructor parameter.

private final Injector m_injector;

public FooClass(@Named("FooInjector") Injector injector) {
m_injector = injector;
}

But guice doesn't permit to bind core classes (injectors, modules and etc). What is the solution?

解决方案

You should not be using the Injector directly. Rather pass in the Provider<FooClass> instead. Also, you should be injecting the provider in the places where you use FooClass.

private final Provider<FooClass> provider;

@Inject
public ClassWhereFooIsUsed(Provider<FooClass> provider) {
    this.provider = provider;
}

.... somewhere else
FooClass f = provider.get(); // This is lazy

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