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Java Naming and Directory Interface(TM).
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Overview of JNDI
Event and Service Provider Packages
Event Package
The
javax.naming.event package
contains classes and interfaces for supporting event notification
in naming and directory services.
Event notification is described in detail in the
trail.
- Events
-
A
NamingEvent represents an event that is generated by a naming/directory service.
The event contains a type that identifies the type of event.
For example,
event types are categorized into those that affect the namespace,
such as "object added," and those that do not, such as "object changed."
- Listeners
-
A
NamingListener
is an object that listens for NamingEvents.
Each category of event type has a corresponding type of NamingListener.
For example, a
NamespaceChangeListener represents a listener interested in namespace change events and an
ObjectChangeListener represents a listener interested in object change events.
To receive event notifications, a listener must be registered with either an
EventContext or an
EventDirContext.
Once registered, the listener will receive event notifications when
the corresponding changes occur in the naming/directory service.
The details about Event Notification can be found in the
JNDI Tutorial
Service Provider Package
The
javax.naming.spi package
provides the means by which developers of different
naming/directory service providers can develop and hook up their
implementations so that the corresponding services are accessible from
applications that use the JNDI.
- Plug-In Architecture
-
The javax.naming.spi package allows different implementations to be plugged in
dynamically.
These implementations include those for the
initial context and for contexts that can be reached
from the initial context.
-
- Java Object Support
-
The javax.naming.spi package supports
implementors of lookup
and related methods to return Java objects that are natural
and intuitive for the Java programmer.
For example, if you look up a printer name from the directory,
then you likely would expect to get
back a printer object on which to operate.
This support is provided in the form of
object factories.
This package also provides support for doing the reverse.
That is, implementors of
Context.bind() and related methods can accept Java objects and
store the objects in a format acceptable to the underlying naming/directory
service.
This support is provided in the form of
state factories.
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- Multiple Naming Systems (Federation)
-
JNDI operations allow applications to supply names that span multiple
naming systems. In the process of completing
an operation, one service provider might need to interact
with another service provider, for example to pass on
the operation to be continued in the next naming system.
This package provides support for
different providers to cooperate to complete JNDI operations.
The details about the Service Provider mechanism can be found in the
JNDI Tutorial
