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FIGURE 8-1
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Three tiers of an application
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The middleware provides business solutions and services, such as these:
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n Database management
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The ability to access a database server such as DB/2,
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Oracle, or SQL Server.
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n Messaging n Naming n Security
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The ability to send and receive data between applications. The ability to find a resource by name instead of by location.
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The ability to authenticate and authorize a user (note that this is not solely a middle-tier responsibility).
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The Java Platform Enterprise Edition (Java EE) APIs extend standard Java and provide access to these services. The middleware is loosely coupled with the parts of the application that are running in the presentation and persistence tiers. This loose coupling improves the reliability of middleware by isolating it from failures that may occur on either of the other tiers.
Message-Oriented Middleware
Message-oriented middleware, also known as MOM, is middleware that is used for messaging. This middleware is the infrastructure that provides dependable mechanisms that enable applications to create, send, and receive messages within an enterprise environment. The advantage of message-based applications is that they are event driven. They exchange messages in a wide variety of formats and deliver messages quickly and reliably.
8: Messaging
Here is the most recent list of the enterprise messaging vendors available at the time of writing:
n Adobe n BEA Systems, Inc. n IBM n Oracle Corporation n Sonic Software n SpiritSoft, Inc. n Sun n TIBCO Software, Inc.
Communication Modes
Typically, applications use synchronous method calls for communication. In this type of communication, the requester is blocked from processing any further commands until the response (or a time-out) is received. Synchronous communication is conducted between two active participants. The receiver has to acknowledge receipt of the message before the sender can proceed. From the sender s perspective, this is known as a blocking call. As the volume of traffic increases, more bandwidth is required, and the need for additional hardware becomes critical. These implementations are more easily directly affected by hardware, software, and network failures. When capacities are exceeded, the opportunity to process the information is typically lost. An example of synchronous communication is credit card authorization. When your card is swiped through a card reader and the details of the purchase are entered, the machine dials the authorization computer and waits for a response (approval or denial of the purchase). In asynchronous communication, the parties are peers and can send and receive messages at will. Asynchronous communication does not require real-time acknowledgment of a message; the requester can continue with other processing once it sends the message. From the sender s perspective, this is known as a nonblocking call. An example of asynchronous communication is e-mail. Even if your computer is switched off or your e-mail client is not running, other people can still send e-mail messages to you. When you start your e-mail client, you will be able to view the e-mail messages that have accumulated in your inbox.
Identify Scenarios That Are Appropriate to Implementation Using Messaging
Message Models
JMS supports two basic message models known as publish/subscribe (pub/sub), in which messages are published on a one or more-to-many basis, and point-to-point (PTP), in which messages are sent on a one-to-one basis. The JMS specification requires that the messaging vendor product support at least one of these models in order to be compliant. An in-depth explanation of these two models appears later in this chapter in the sections, How the Point-to-Point Message Model Works and How the Publish/Subscribe Message Model Works.
CERTIFICATION OBJECTIVE 8.01
Identify Scenarios That Are Appropriate to Implementation Using Messaging
The following table shows some example messaging implementations that can be used as solutions to the given scenarios.
SCENARIO & SOLUTION
You need to call a validation application to approve a customer s credit card purchases. Which type of messaging model is best used for this type of communication, and what type of communication works best in such a scenario You are using an e-mail application, and you want to send a message to several recipients and receive replies from them all. Which type of communication is best for this type of application You need to broadcast information to many recipients What messaging technology is most appropriate for guaranteeing the delivery of a message to a single recipient and to multiple recipients Point-to-point model messaging is best because the message only needs to be processed one time by the validation system. Synchronous communication works best because the results are required before the customer is allowed to use the merchandise. Asynchronous communication is best suited to an e-mail application because the recipients are not required to be online for the sender to send the message. The publish/subscribe messaging model is best because the broadcast capability is part of its design. For the single recipient, use the point-to-point messaging model with persistent delivery mode. For multiple recipients, use the publish/subscribe model with a persistent delivery mode and a durable subscriber. Use the point-to-point model. Create transacted sessions and process messages with commit and rollback methods.
What messaging technology is most appropriate for sending and receiving messages in a transactional way
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