与Guice通用绑定 [英] Generic Bind with Guice

问题描述

我试图建立一个简单的lib以实现持久性以及guice持久性和其他一些功能.

I trying to build a simple lib for persistence with guice persist and some other things.

我已经有了一个AbstractDao<T>，我可以像老板一样轻松地扩展和绑定具体的实现.

I already have a AbstractDao<T>, that I can easily extend and bind the concrete implementation like a boss.

但是，我想要一种GenericDao，像这样:

But, I want a kind of GenericDao, like this:

public abstract class GenericDao<T extends Bean> {


@Inject
private Provider<EntityManager> emp;

protected EntityManager em() {
    return emp.get();
}

public AbstractDao() {
}

protected abstract Class<T> clazz();
// ....

如果我只需要将CRUD(以抽象dao实现)放入某个bean，我想像老板一样注入GenericDao<SomeBean>.

And if I will have just the CRUD (implemented in abstract dao) in for some bean, I want to inject GenericDao<SomeBean> like a boss.

因此，我开始尝试一些技巧，并获得以下信息:

So, I started to try some hacks, and get the following:

public abstract class AbstractPersistentModule extends AbstractModule {

    protected <T extends Bean> LinkedBindingBuilder<T> bindGenericDao(final Class<T> clazz) {
       return bind(
               new TypeLiteral<GenericDao<T>>(){}
       )./* what the hell can I do here? */;
    }
}

如果我可以使它工作，那么我将可以做一个简单的事情:

If I can make it work, I'll be able to do a simple:

bindGenericDao(Pessoa.class);

有人知道这样做的方法吗?

Someone know a way to do that?

推荐答案

请参阅此

See this post for a working implementation.

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