B2B Integration : A Practical Guide to Collaborative E-commerce

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Chapter 8 Middleware Technologies The focus of this chapter Middleware technologies advance the goals of B2B integration and enterprise application integration. By integrating disparate systems throughout an organization, middleware technologies can promote a zero-latency enterprise strategy where data is exchanged across systems in real-time; reduce application development time and improve speed to market; create standardized development methodologies throughout an organization; facilitate the integration of systems inherited through mergers or acquisitions; and reduce application maintenance. In this chapter, we have presented an introduction to all the leading middleware technologies, including message oriented middleware — MQSeries, JMS and MSMQ, transaction processing monitors, distributed components middleware — CORBA, Windows DNA and J2EE. You will also get an overview of the leading J2EE-based application servers — BEA's WebLogic and IBM's WebSphere. 213
214 B2B Integration — A Practical Guide to Collaborative E-commerce 8.1. What is Middleware? The term 'middleware' is actually a misnomer to a large degree. Middleware has typically been defined as distributed software that resides in the middle of a client/server system providing a uniform 'conduit' for client applications to communicate with a server. The truth is that many middleware products manage, contain and share business and application logic, operating more as a server than as 'middleware'. Traditional middleware technologies include message oriented middleware (MOM), TP monitors and distributed object technology, though a 'purer' type of middleware would be communication conduits such as TCP/IP, DCE and RPC. Middleware products provide a highlevel abstraction through an API that shields a developer from the complexities of heterogeneous platforms and architectures. In order to accomplish the transfer of information, most middleware will follow a standard set of functions as under: • The sending application formats the information into a message buffer using a process called marshalling. • The sending application must identify the location of the receiving application or service. The destination can be specified several ways including: 1. Hard coding; 2. Initialization file; and 3. Middleware naming service such as JNDI or UDDI. • The sending application must initiate a network communications session with the destination application. • The sending application must transfer the message buffer to the receiving application. • The receiving application must receive the message buffer. • The receiving application must extract and interpret the information in the message using a process called unmarshalling. • If a response is required, then the receiving application must generate a response and repeat the communication process to send a message back to the sender.
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Chapter 2 Components, Benefits, Cha
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Chapter "] 2 Wireless Technologies
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