API java : BeanContextServices

java.beans.beancontext
Interface BeanContextServices

All Superinterfaces:

BeanContext, BeanContextChild, BeanContextServiceRevokedListener, BeanContextServicesListener, Collection, DesignMode, EventListener, Iterable, Visibility

All Known Implementing Classes:

BeanContextServicesSupport

public interface BeanContextServices
extends BeanContext, BeanContextServicesListener

The BeanContextServices interface provides a mechanism for a BeanContext to expose generic "services" to the BeanContextChild objects within.

addService

boolean addService(Class serviceClass,
                   BeanContextServiceProvider serviceProvider)

Adds a service to this BeanContext. BeanContextServiceProviders call this method to register a particular service with this context. If the service has not previously been added, the BeanContextServices associates the service with the BeanContextServiceProvider and fires a BeanContextServiceAvailableEvent to all currently registered BeanContextServicesListeners. The method then returns true, indicating that the addition of the service was successful. If the given service has already been added, this method simply returns false.

Parameters:

serviceClass - the service to add

serviceProvider - the BeanContextServiceProvider associated with the service

revokeService

void revokeService(Class serviceClass,
                   BeanContextServiceProvider serviceProvider,
                   boolean revokeCurrentServicesNow)

BeanContextServiceProviders wishing to remove a currently registered service from this context may do so via invocation of this method. Upon revocation of the service, the BeanContextServices fires a BeanContextServiceRevokedEvent to its list of currently registered BeanContextServiceRevokedListeners and BeanContextServicesListeners.

Parameters:

serviceClass - the service to revoke from this BeanContextServices

serviceProvider - the BeanContextServiceProvider associated with this particular service that is being revoked

revokeCurrentServicesNow - a value of true indicates an exceptional circumstance where the BeanContextServiceProvider or BeanContextServices wishes to immediately terminate service to all currently outstanding references to the specified service.

hasService

boolean hasService(Class serviceClass)

Reports whether or not a given service is currently available from this context.

Parameters:

serviceClass - the service in question

Returns:

true if the service is available

getService

Object getService(BeanContextChild child,
                  Object requestor,
                  Class serviceClass,
                  Object serviceSelector,
                  BeanContextServiceRevokedListener bcsrl)
                  throws TooManyListenersException

A BeanContextChild, or any arbitrary object associated with a BeanContextChild, may obtain a reference to a currently registered service from its nesting BeanContextServices via invocation of this method. When invoked, this method gets the service by calling the getService() method on the underlying BeanContextServiceProvider.

Parameters:

child - the BeanContextChild associated with this request

requestor - the object requesting the service

serviceClass - class of the requested service

serviceSelector - the service dependent parameter

bcsrl - the BeanContextServiceRevokedListener to notify if the service should later become revoked

Returns:

a reference to this context's named Service as requested or null

Throws:

TooManyListenersException

releaseService

void releaseService(BeanContextChild child,
                    Object requestor,
                    Object service)

Releases a BeanContextChild's (or any arbitrary object associated with a BeanContextChild) reference to the specified service by calling releaseService() on the underlying BeanContextServiceProvider.

Parameters:

child - the BeanContextChild

requestor - the requestor

service - the service

getCurrentServiceClasses

Iterator getCurrentServiceClasses()

Gets the currently available services for this context.

Returns:

an Iterator consisting of the currently available services

getCurrentServiceSelectors

Iterator getCurrentServiceSelectors(Class serviceClass)

Gets the list of service dependent service parameters (Service Selectors) for the specified service, by calling getCurrentServiceSelectors() on the underlying BeanContextServiceProvider.

Parameters:

serviceClass - the specified service

Returns:

the currently available service selectors for the named serviceClass

addBeanContextServicesListener

void addBeanContextServicesListener(BeanContextServicesListener bcsl)

Adds a BeanContextServicesListener to this BeanContext

Parameters:

bcsl - the BeanContextServicesListener to add

removeBeanContextServicesListener

void removeBeanContextServicesListener(BeanContextServicesListener bcsl)

Removes a BeanContextServicesListener from this BeanContext

Parameters:

bcsl - the BeanContextServicesListener to remove from this context