unguiculus wrote:
Hello,
I am trying to bind the same class twice using annotations. This does
not work using explicit bindings, but it does using provides methods.
Seems like a bug to me.
No, its a feature. See here
http://code.google.com/docreader/#p=google-guice&s=google-guice&t=Scopes
Here's a sample test class. The first test
fails because the same instance is returned. The second one passes as
expected. The class Foo is annotated w...@singleton.
public class GuiceMultiSingleton {
@Test
public void twoSingletonsWithExplicitBinding() {
Injector injector = Guice.createInjector(new AbstractModule() {
@Override
protected void configure() {
bind(IFoo.class).annotatedWith(Names.named("a")).to(Foo.class);
bind(IFoo.class).annotatedWith(Names.named("b")).to(Foo.class);
}
});
IFoo fooA = injector.getInstance(Key.get(IFoo.class,
Names.named("a")));
IFoo fooB = injector.getInstance(Key.get(IFoo.class,
Names.named("b")));
assertThat(fooA, not(sameInstance(fooB))); // fails, same instance
}
@Test
public void twoSingletonsWithProvidesMethods() {
Injector injector = Guice.createInjector(new AbstractModule() {
@Override
protected void configure() {
}
@Named("a")
@Singleton
@Provides
IFoo provideFooA() {
return new Foo();
}
@Named("b")
@Singleton
@Provides
IFoo provideFooB() {
return new Foo();
}
});
IFoo fooA = injector.getInstance(Key.get(IFoo.class,
Names.named("a")));
IFoo fooB = injector.getInstance(Key.get(IFoo.class,
Names.named("b")));
assertThat(fooA, not(sameInstance(fooB))); // passes
}
}
Am I missing something here?
Thanks,
Reinhard
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