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The Java Naming and Directory Interface (JNDI) API provides general client-side querying features against directory and naming services by both attributes and a hierarchy of names. Examples of supported directory and naming services include the Lightweight Directory Access Protocol (LDAP), the Novell Directory Services (NDS), the Domain Name Service (DNS), the Network Information Systems (NIS), File Systems, EJB naming services, and Common Object Request Broker Architecture (CORBA), as shown in Figure 10-5. Naming and directory services are designed as database structures that are typically laid out as hierarchal directories, not relational table-based databases.
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Working with Additional Java Integration APIs
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FIgure 10-5
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Network Information Systems (NIS)
Enterprise JavaBeans (EJB)
Novell Directory Services (NDS)
JNDI methods include connection capabilities, as well as searching, retrieval, and storage of naming and directory service objects. JNDI operations support the association of attributes with objects to assist in the management and retrieval of information related to those objects. JNDI provides an event interface that allows the client application to be notified when directory information has been changed. JNDI lays out its elements as a tree structure of directories and objects. When creating a connection, you need to establish an initial base context. Think of the context as the directory starting point in the tree. You may change the context whenever you like. However, when the context is set, you can only traverse the downward portion of the tree when performing querying operations. Several LDAP browsers are freely available, such as JXplorer and the Softerra LDAP Browser.These utilities let the user remotely access LDAP servers.Their viewing and filtering capabilities are extremely beneficial in understanding the full layout of an LDAP server.These structural details are important to have before you start developing your client code. Many LDAP browser vendors have a full LDAP administrator version available that is often provided in a commercial fashion.
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Understanding Java-Related Platforms and Integration Technologies
the Java Message service apI
The Java Message Service (JMS) API resides in the javax.jms package. This API is used to access the common features of enterprise messaging systems. The JMS API allows for the creation, sending, receiving, and reading of messages with Java EE application components. All of this distributed-computing communications of separate applications is done asynchronously; this is essentially the definition of a messaging system. Several types of messaging systems can be utilized. JMS supports two common models: the publish/subscribe and point-to-point messaging models. Look for this on your exam.
the publish/subscribe Messaging Model
Publish/subscribe messaging is based on events. Consumers subscribe to events of interest by specifying a topic that is part of a set of messages. The producers of these messages will route these messages to the consumers who register for them. The consumers will then consume the events when they arrive.
the point-to-point Messaging Model
Point-to-point (PTP) messaging involves applications routing messages to consumers while using a shared queue. The consumer maintains this queue of awaiting messages, and the messaging application sends messages to that queue. Apache ActiveMQ is an open-source message broker that fully supports JMS 1.1 as part of the J2EE 1.4 specification. Consider researching ActiveMQ for a more practical understanding of the Java Message Service API; http://activemq.apache.org/.
As silly as it sounds, we can t stress enough that you must know the exact full names of the acronyms related to the exam. Reviewing the glossary of this book a few times will help familiarize you. Meaning, don t be surprised if you see a question on the exam similar to, What does JSP stand for followed by four very similar answers.
Certification Summary
CertIFICatION suMMarY
This chapter discussed the differences between the Java platforms, as well as their practical applicability. All three platforms were covered in detail: Java SE, Java ME, and Java EE. SCJA-related Java integration technologies, including the Java RMI API, JDBC API, JNDI API, and the JMS API, were also explored. Let s take a minute to summarize the high-level points of what we ve learned. The Java Platform, Standard Edition comprises the JDK, JRE, and Java SE APIs. The Java Development Kit includes all of the tools necessary to develop, debug, and test Java applications. The JDK includes the JRE. The Java Runtime Environment contains the deployment technologies and Java Virtual Machines necessary to execute bytecode. The JRE includes the Java SE API, which in turn contains software packages encompassing related classes and interfaces. The Java Platform, Micro Edition is a configurations-based architecture designed for embedded devices such as high-end PDAs and mobile phones. The Java Platform, Enterprise Edition is used to build flexible, scalable, and secure enterprise systems. In Java enterprise systems, there is a clear separation between business and presentation logic. The Remote Method Invocation API allows for distributed computing through remote procedure calls. Client-side stubs and server-side stubs (skeletons) provide the stubs necessary for marshaling system references and values. The Java Database Connectivity API provides database support, allowing you to execute SQL queries and process the results of the queries. The Java Naming and Directory Interface API lets you access naming and directory services. JNDI methods include the searching, retrieval, and storage capabilities of naming and directory service objects. The Java Message Service API is used to access the features of messaging systems, specifically systems that use the publish/subscribe and point-to-point messaging models. You will not need to retain all of the finer details discussed in this chapter in regards to the core topics of platforms and integration technologies. However, the more information you can retain, the easier the high-level questions will be for you come exam time.
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