java.beans.beancontext

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 and Description
Iterator	getCurrentServiceSelectors(BeanContextServices bcs, Class serviceClass) Invoked by BeanContextServices, this method gets the current service selectors for the specified service.
Object	getService(BeanContextServices bcs, Object requestor, Class serviceClass, Object serviceSelector) Invoked by BeanContextServices, this method requests an instance of a service from this BeanContextServiceProvider.
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.

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 - The BeanContextServices associated with this particular request. This parameter enables the BeanContextServiceProvider 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, or null 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 - the BeanContextServices 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 - the BeanContextServices for this request

serviceClass - the specified service

Returns:

the current service selectors for the specified serviceClass