Interface BeanContextServiceProvider
- All Known Implementing Classes:
BeanContextServicesSupport.BCSSProxyServiceProvider
public interface BeanContextServiceProvider
One of the primary functions of a BeanContext is to act a as rendezvous between JavaBeans, and BeanContextServiceProviders.
A JavaBean nested within a BeanContext, may ask that BeanContext to provide an instance of a "service", based upon a reference to a Java Class object that represents that service.
If such a service has been registered with the context, or one of its nesting context's, in the case where a context delegate to its context to satisfy a service request, then the BeanContextServiceProvider associated with the service is asked to provide an instance of that service.
The ServcieProvider may always return the same instance, or it may construct a new instance for each request.
Method Summary
Modifier and Type | Method | Description |
---|---|---|
Iterator<?> | getCurrentServiceSelectors(BeanContextServices bcs,
Class<?> serviceClass) | Invoked by |
Object | getService(BeanContextServices bcs,
Object requestor,
Class<?> serviceClass,
Object serviceSelector) | Invoked by |
void | releaseService(BeanContextServices bcs,
Object requestor,
Object service) | Invoked by |
Method Detail
getService
Object getService(BeanContextServices bcs, Object requestor, Class<?> serviceClass, Object serviceSelector)
Invoked by BeanContextServices
, this method requests an instance of a service from this BeanContextServiceProvider
.
- Parameters:
-
bcs
- TheBeanContextServices
associated with this particular request. This parameter enables theBeanContextServiceProvider
to distinguish service requests from multiple sources. -
requestor
- The object requesting the service -
serviceClass
- The service requested -
serviceSelector
- the service dependent parameter for a particular service, ornull
if not applicable. - Returns:
- a reference to the requested service
releaseService
void releaseService(BeanContextServices bcs, Object requestor, Object service)
Invoked by BeanContextServices
, this method releases a nested BeanContextChild
's (or any arbitrary object associated with a BeanContextChild
) reference to the specified service.
- Parameters:
-
bcs
- theBeanContextServices
associated with this particular release request -
requestor
- the object requesting the service to be released -
service
- the service that is to be released
getCurrentServiceSelectors
Iterator<?> getCurrentServiceSelectors(BeanContextServices bcs, Class<?> serviceClass)
Invoked by BeanContextServices
, this method gets the current service selectors for the specified service. A service selector is a service specific parameter, typical examples of which could include: a parameter to a constructor for the service implementation class, a value for a particular service's property, or a key into a map of existing implementations.
- Parameters:
-
bcs
- theBeanContextServices
for this request -
serviceClass
- the specified service - Returns:
- the current service selectors for the specified serviceClass