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

Based on Geoff's answer you can "make callable" @PostConstruct method:

public class GuiceExample {
    @Inject
    private IDataManager dataManager;

    public GuiceExample() {
        System.out.println("Constructor");
    }

    @PostConstruct
    private void init() {
        dataManager.printData();
    }

    public static void main(String[] args) {
        Injector injector = Guice.createInjector(new AbstractModule() {

            @Override
            protected void configure() {
                bind(IDataManager.class).to(DataManager.class);
                bindListener(HasPostConstructAnnotationMatcher.INSTANCE, new TypeListener() {

                    @Override
                    public  void hear(TypeLiteral type, TypeEncounter encounter) {
                        encounter.register(PostConstructAnnotationInvoker.INSTANCE);
                    }
                });
            }
        });

        GuiceExample example = injector.getInstance(GuiceExample.class);
    }

    private static class HasPostConstructAnnotationMatcher extends AbstractMatcher> {
        private static final HasPostConstructAnnotationMatcher INSTANCE = new HasPostConstructAnnotationMatcher();

        @Override
        public boolean matches(TypeLiteral t) {
            return Arrays.stream(t.getRawType().getDeclaredMethods()).anyMatch(GuiceExample::hasPostConstructAnnotation);
        }

    }

    private static boolean hasPostConstructAnnotation(Method method) {
        Annotation[] declaredAnnotations = method.getAnnotations();
        return Arrays.stream(declaredAnnotations).anyMatch(a -> a.annotationType().equals(PostConstruct.class));
    }

    private static class PostConstructAnnotationInvoker implements InjectionListener