Here are some examples of how object factories are used to read the objects
created in the
Storing Objects in the Directory 
lesson and the
State Factories lesson.
-
Reference example . The object factory
FruitFactory
is used because its class name is identified in the reference.
The factory creates an instance of
Fruit.
-
Attributes example . The client programs
(lookup,
list, and
search)
set the Context.OBJECT_FACTORIES environment
property to "DrinkFactory" so that
NamingManager.getObjectInstance() will
load and instantiate
DrinkFactory
to create an instance of
Drink.
-
Serialization example . No object factory is used. The serialized object
(an instance of java.awt.Button) is returned unchanged by the
NamingManager.getObjectInstance().
-
Remote reference example . The RMI URL context factory turns the RMI URL stored in a reference
in the directory into an RMI stub found in the RMI registry.
-
Remote (JRMP) object example . An object factory (bundled with the service provider)
turns the marshalled object of
the RMI stub stored in the directory back into an RMI stub.
-
Remote (IIOP) object example . An object factory (bundled with the service provider)
turns the stringified CORBA object reference
stored in the directory into a live CORBA object.
-
CORBA example . An object factory (bundled with the service provider)
turns the stringified CORBA object reference
stored in the directory into a live CORBA object.
-
Custom object example . The object factory PersonObjectFactory
turns an LDAP entry (represented by a set of attributes) into a
Person object.
PersonObjectFactory is identified in the
application resource file
used by the client program (CustomObj).
The rest of this lesson describes the object factories
FruitFactory,
DrinkFactory, and
PersonObjectFactory.
