java.beans.beancontext

Interface BeanContextServiceProvider

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

Iterator<E>
getCurrentServiceSelectors(BeanContextServices bcs, Class<T> serviceClass)
Invoked by BeanContextServices, this method gets the current service selectors for the specified service.
Object
getService(BeanContextServices bcs, Object requestor, Class<T> 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 Details

getCurrentServiceSelectors

public Iterator<E> getCurrentServiceSelectors(BeanContextServices bcs,
                                           Class<T> 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

getService

public Object getService(BeanContextServices bcs,
                         Object requestor,
                         Class<T> 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
Usages and Demos :

View More Examples of getService(BeanContextServices bcs,Object requestor,Class serviceClass,Object serviceSelector)
   1: import java.beans.beancontext.BeanContextChild;
   2: import java.beans.beancontext.BeanContextServiceProvider;
   3: 
   4:         ...
   5: 
   6:     private transient BeanContextServiceProvider _cbcFactoryProvider;
   7: 
   8:         ...
   9:         if (service == null && serviceClass.equals(ControlBeanContextFactory.class)) {
  10:             return (T)_cbcFactoryProvider.getService(this, this, serviceClass, selector);
  11:         }

View Full Code Here
   1: import java.beans.beancontext.BeanContextChild;
   2: import java.beans.beancontext.BeanContextServiceProvider;
   3: import java.net.URL;
   4:         ...
   5:         if (service == null && serviceClass.equals(ControlBeanContextFactory.class)) {
   6:             return (T)_bcsp.getService(this, this, serviceClass, selector);
   7:         }
   8:         ...
   9:     private transient Stack<RequestContext> _reqStack;
  10:     private transient BeanContextServiceProvider _bcsp;
  11: }

View Full Code Here

releaseService

public 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