xy.reflect.ui.resource.jdk-apidocs.java.beans.beancontext.BeanContextServiceProvider.html Maven / Gradle / Ivy

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.

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