Could you maybe create a Foo subclass?
class SubFoo extends Foo {
public SubFoo() {
super(10);
}
}
…
bind(Foo.class).to(SubFoo.class);
bindInterceptor(…)…
On Friday, November 4, 2016 at 3:48:42 AM UTC+1, lei wang wrote:
>
> I want to add an interceptor to a 3rd party class. Since it does not have
> a no-arg constructor, I'd have to use a provider to create an instance. But
> it seems that provider returns a raw object (no proxy), and I can't
> intercept it. Do i miss something? How can I add an interceptor to a class
> without no-arg constructor ? Here is a snippet..
>
> class Foo {
> public Foo(int value) {...}
>
> public void exec() {...}
> }
>
> class Bar {
> public void bar() {...}
> }
>
> class FooBarModule extends AbstractModule {
> protected void configure() {
> bind(Foo.class).toProvider(FooProvider.class);
> bind(Bar.class);
>
>
>
> bindInterceptor(Matchers.subclassesOf(Foo.class).or(Matchers.subclassesOf(Bar.class)),
>
> Matchers.any(), new FooBarInterceptor());
> }
> }
>
>
> class FooMain {
> public static void main(String[] args) {
> Injector injector = Guice.createInjector(new FooModule());
> Foo fooObj = injector.getInstance(Foo.class);
>
> fooObj.exec(); // FooBarInterceptor is NOT triggered,
> because fooObj is a raw object.
>
> Bar barObj = injector.getInstance(Bar.class);
> barObj.bar(); // FooBarInterceptor is triggeredas
> expected. barObj is a Guice proxied object
> }
>
>
>
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