java.beans.beancontext
Interface BeanContextServiceProvider
- BeanContextServicesSupport.BCSSProxyServiceProvider
An actual factory for services.
It is the
BeanContextServiceProvider's responsibility to
register itself with whatever
BeanContextServices object
it wishes to provide services through using the
addService() method.
If for some reason it can no longer provide services for a particular
class, this class must invoke
BeanContextServices.revokeService(serviceClass,this,true)
for all the places it has registered the service.
getCurrentServiceSelectors
public Iterator<E> getCurrentServiceSelectors(BeanContextServices services,
Class<T> serviceClass) Get a list of valid service selectors for the specified service class.
This method is called from
BeanContextServices.getCurrentServiceSelectors().
If the specified service class does not have a finite number of
valid service selectors, it should return
null.
If it takes a general
Integer parameter, for
example, you may as well return
null or the poor
soul who called this method will be iterating all day.
If it has no valid service selectors, it should still return an empty
Iterator.
services - the BeanContextServices that wants
to get the service selectors. Only weak references to this will
be retained, and it will never be changed, only queried
in a read-only manner.serviceClass - the service class to get selectors for.
- a list of valid service selectors for the service
class, or
null.
getService
public Object getService(BeanContextServices services,
Object requestor,
Class<T> serviceClass,
Object serviceSelector) Get a service.
Called from
BeanContextServices.getService().
If the requested service class is not available, or if this
BeanContextServiceProvider chooses not honor the
request for some reason, then this method will return
null.
This method may throw unchecked exceptions, so watch out.
services - the BeanContextServices that wants
to get the service. Only weak references to this will
be retained, and it will never be changed, only queried
in a read-only manner.requestor - the actual requestor of the service. Only
weak references to this will be retained, and it will
never be changed, only queried in a read-only manner.serviceClass - the Class of the service being
requested.serviceSelector - a parameter to customize the service
returned with.
- an instance of
serviceClass (such that
instanceof serviceClass is true), or
null.
releaseService
public void releaseService(BeanContextServices services,
Object requestor,
Object service) Release the service.
Called by
BeanContextServices.releaseService().
Most
BeanContextServiceProviders won't have to do
anything here.
services - the BeanContextServices that wants
to release the service. Only weak references to this will
be retained, and it will never be changed, only queried
in a read-only manner.requestor - the original requestor of the service.service - the service to relinquish
java.beans.beancontext.BeanContextServiceProvider
Copyright (C) 1999 Free Software Foundation, Inc.
This file is part of GNU Classpath.
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