September 2010
Intermediate to advanced
766 pages
18h 35m
English
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Naming and Object Stores
All naming services essentially do the same thing: they provide clients with a mechanism for locating distributed objects or resources. To accomplish this, a naming service must fulfill two requirements: object binding and a lookup API. Object binding is the association of a distributed object with a natural language name or identifier. A lookup API provides the client with an interface to the naming system; it simply allows us to connect with a distributed service and request a remote reference to a specific object.
Enterprise JavaBeans mandates the use of Java Naming and Directory Interface (JNDI; http://java.sun.com/products/jndi/) as a lookup API on Java clients. JNDI supports just about any kind of naming and directory service. Although it can become extraordinarily complex, the way JNDI is used in Java Enterprise Edition (EE) applications is usually fairly simple. Java client applications can use JNDI to initiate a connection to an EJB server and locate a specific EJB.
There are many different kinds of directory and naming services, and EJB vendors can choose the one that best meets their needs, but all vendors must support the CORBA naming service in addition to any other directory services they choose to support.
Naming is a subset of the resource management features offered by EJB, and it is discussed in Chapter 16.
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