Guice call init method after instantinating an object

Question

Is it possible to tell Guice to call some method (i.e. init()) after instantinating an object of given type?

I look for functionality similar to @PostConstruct annot

Answer 1

If you'd like to call a method after the construction of an instance, it means the post-construct method call is actually a step of the instance creation. In this case, I would recommend abstract factory design pattern to solve this problem. The code may look like something like this:

class A {
    public A(Dependency1 d1, Dependency2 d2) {...}

    public postConstruct(RuntimeDependency dr) {...}
}

interface AFactory {
    A getInstance(RuntimeDependency dr);
}

class AFactoryImpl implements AFactory {
    @Inject
    public AFactoryImpl(Dependency1 d1, Dependency2 d2) {...}

    A getInstance(RuntimeDependency dr) {
        A a = new A(d1, d2);
        a. postConstruct(dr);
        return a;
    }
}

// in guice module
bind(AFactory.class).to(AFactoryImpl.class)