guiceinitpostconstruct

Guice call init method after instantinating an object

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 annotation in EJB 3 (and Spring).

Solution

  • Actually, it is possible.

    You need to define a TypeListener to get the functionality going. Something along the lines of the following in your module definition:

    bindListener(Matchers.subclassesOf(MyInitClass.class), new TypeListener() {
    @Override
    public <I> void hear(final TypeLiteral<I> typeLiteral, TypeEncounter<I> typeEncounter) {
        typeEncounter.register(new InjectionListener<I>() {
            @Override
            public void afterInjection(Object i) {
                MyInitClass m = (MyInitClass) i;
                m.init();
            }
        });
    }
});