B2B Integration : A Practical Guide to Collaborative E-commerce

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Producer Topic t Middleware Technologies 223 Subscribes Delivers Msgl Delivers Subscribes Figure 8.2. — Publish/subscribe messaging system Subscriber 1 Subscriber 2 'subscribe' to events of interest and consume events (see Figure 8.2). Producers associate messages with a specific topic and the messaging system routes messages to consumers based on topics the consumers register interest in. Publish/subscribe allows each application in the system to decide which events it wants to be notified about. Publishers do not know which applications are subscribing, nor do they care. The messaging middleware is responsible for ensuring that each subscriber receives the message once it receives it from the publisher. TIBCO's TIB/Rendezvous popularized the publish/subscribe model, where it found a large following in the financial industry. Point-to-point In point-to-point messaging systems, messages are routed to an individual consumer which maintains a queue of 'incoming' messages. Messaging applications send messages to a specified queue and clients retrieve messages from a queue. As Figure 8.3 illustrates, the traditional point-to-point MOM architecture can create a maintenance nightmare. Each application's messaging service must know about the messaging services of all other applications in order to communicate. As new applications are added to the enterprise, their messaging services must be systematically updated to communicate with each application.
224 B2B Integration — A Practical Guide to Collaborative E-commerce Message passing Mini Computer Mainframe Unix ! WinNT AS/400 Figure 8.3. — Point-to-point messaging system Message passing uses a request/reply model where the communication occurs in a synchronous manner, requiring the calling application to halt execution until a response is received. Synchronous messaging requires that every application, server and service necessary to complete the communication must be available and in service, just as if it where an RPC communication. 8.3.3. MOM frameworks There are two types of messaging frameworks: message queuing and message brokers. Traditional MOM supports the point-to-point model while message brokers support the new paradigm of a hub-and-spoke model. Message brokers offer much potential in B2Bi and may be the closest thing to EAI nirvana that the industry has seen. Message queuing Message queuing is a point-to-point model of communication between programs. Messages are stored in queues, which can either be buffered
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Chapter 2 Components, Benefits, Cha
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Chapter 4 Enterprise Application In
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Chapter Q Extensible Markup Languag
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Chapter "] 2 Wireless Technologies
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Company Brience Everypath GadgetSpa
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Chapter "] 5 E-Marketplaces and Col
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B2B Integration : A Practical Guide to Collaborative E-commerce

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