Question

基本界面：

public interface Registry<E> {
    E method();
}

接口实现：

RegistryImpl<E> implements Registry<E> {

    @Inject
    RegistryImpl(...) {
    }

    @Override
    public E method() {
         (...)
    }

}

用于绑定数据对象A的注册表：

@BindingAnnotation
@Target({ FIELD, PARAMETER, METHOD }) @Retention(RUNTIME)
@interface CustomDataObjectARegistry {
}

用于绑定数据对象B的注册表：

@BindingAnnotation
@Target({ FIELD, PARAMETER, METHOD }) @Retention(RUNTIME)
@interface CustomDataObjectBRegistry {
}

我想将CustomDataObjectARegistry绑定到RegistryImpl<DataObjectA>，并且将CustomDataObjectBRegistry绑定到RegistryImpl<DataObjectB>，但是还无法弄清楚语法。

bind(CustomDataObjectARegistry.class).to(new TypeLiteral<RegistryImpl<DataObjectA>>() {})

给我一个“无法解决的方法。”

Answer 1

我想您要做的是：

bind(new TypeLiteral<Registry<DataObjectA>>() {}).to(new TypeLiteral<RegistryImpl<DataObjectA>>() {})
bind(new TypeLiteral<Registry<DataObjectB>>() {}).to(new TypeLiteral<RegistryImpl<DataObjectB>>() {})

//and then inject with generics:
Registry<DataObjectA> registryA;
Registry<DataObjectB> registryB;

或：

bind(Registry.class).annotatedWith(CustomDataObjectARegistry.class).to(new TypeLiteral<RegistryImpl<DataObjectA>>() {})
bind(Registry.class).annotatedWith(CustomDataObjectBRegistry.class).to(new TypeLiteral<RegistryImpl<DataObjectB>>() {})

//and then inject with annotations:
@CustomDataObjectARegistry Registry registryA;
@CustomDataObjectBRegistry Registry registryB;

基本上，您可以使用完整的通用签名进行区分，也可以使用批注，但您不必同时使用两者。我建议通过泛型来区分。

Guice依赖注入将多个类绑定到同一接口

1 个答案: