| Re: [sisu-users] watching injected components |
On 1 Mar 2014, at 19:26, Igor Fedorenko <igor@xxxxxxxxxxxxxx> wrote:
> Say I have a couple of components, ComponentA and ComponentB
>
> @Named
> class ComponentA {}
>
> @Named
> class ComponentB {
> @Inject
> ComponentA a;
> }
>
> Does sisu (or guice for that matter) provide a way to observe injection
> of ComponentA instances into ComponentB instances?
>
> To give some context, I develop a maven extension that needs to track
> what objects are injected in Mojo instances and it needs to have
> per-Mojo breakdown of all injected components.
The API that comes closest is probably the Guice ProvisionListener API:
https://code.google.com/p/google-guice/source/browse/core/src/com/google/inject/spi/ProvisionListener.java
This lets you intercept the provisioning of any objects initiated by Guice and also provides the dependency chain that led to the object being provisioned - you’ll need to drill down the chain into the Dependency then the InjectionPoint if you want to know the exact declaring type and member (constructor, method, field etc.)
You can bind a listener for all bindings as follows:
bindListener(Matchers.any(), myProvisionListener); // you can narrow down the matching if you know what bindings you’re interested in
https://code.google.com/p/google-guice/source/browse/core/src/com/google/inject/Binder.java#379
See also https://code.google.com/p/google-guice/issues/detail?id=78#c16
> --
> Regards,
> Igor
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