Guice:注入带有自己参数的构造函数的类吗? [英] Guice: Inject class with constructor with own parameters?

问题描述

我对Guice有问题.我想举一个例子来说明这一点.我想始终动态传递此构造函数的参数，例如新测试("bob"，765)；.我还希望Guice注入一些字段(例如此处SomeOtherObject).我怎样才能做到这一点?预先感谢！

I have a problem with Guice. I would like to show this with an example. I want to pass the parameters of this constructor always dynamically, so e.g. new Test("bob", 765);. I also want some fields (like here SomeOtherObject) to be injected by Guice. How can I do this? Thanks in advance!

public class Test {

private String name;
private int id;

//Needs to be injected by Guice
@Inject
SomeOtherObject object;

public Test(String name, int id) {
    this.name = name;
    this.id = id;
}

}

推荐答案

Guice的 AssistedInject 功能是处理此问题的好方法.

Guice's AssistedInject feature is a good way to handle this.

基本上，您定义工厂以使用以下方法获取 Test 对象:

Basically you define a factory to get Test objects with:

public interface TestFactory {
    public Test create(String name, int id);
}

使用 @Assisted 批注扩展 Test 类的 @Inject 构造函数:

Augment the Test class's @Inject constructor with @Assisted annotation:

public class Test {
    @Inject
    public Test(SomeOtherObject object, @Assisted String name, @Assisted int id) {
        this.object = object;
        this.name = name;
        this.id = id;
    }
}

然后在模块的配置中使用 FactoryModuleBuilder :

And then use FactoryModuleBuilder in your Module's configure:

install(new FactoryModuleBuilder().build(TestFactory.class));

而不是直接构造 Test s，而是注入 TestFactory 并使用它来创建 Test s:

And instead of constructing Tests directly, inject a TestFactory and use it to create Tests:

public class OtherThing {
    @Inject
    TestFactory factory;

    public Test doStuff(Stirng name, int id) {
        return factory.create(name, id);
    }
}

注意:现在看文档，看来 AutoFactory 具有被引入作为实现此操作的首选方法，并且可能会更简单.

Note: looking at the docs now, it appears that AutoFactory has been introduced as the preferred way to do this, and may be simpler.

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