Business Process Execution Language for Web Services by Poornachandra Sarang, Matjaz Juric, Benny Mathew

By Poornachandra Sarang, Matjaz Juric, Benny Mathew

This publication is a accomplished consultant to the utilization and syntax of the enterprise technique Execution Language for internet companies (BPEL4WS). significant BPEL4WS servers, the Oracle BPEL technique supervisor and Microsoft BizTalk Server 2004 are coated intimately, and an summary of different significant BPEL4WS servers is equipped. The booklet comprises sensible examples on utilizing BPEL4WS.

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The structure of services composed into the business process is shown in the following figure. In Chapter 3 we will discuss this example in detail and show how to define this process using BPEL: From the perspective of our business process, we do not care whether the web service for checking the employee status accesses a legacy system, a database directly, or retrieves the status in any other way. We also do not care whether the web services of airline companies are composed of 16 This material is copyright and is licensed for the sole use by Encarnacion Bellido on 20th February 2006 Via Alemania, 10, bajos, , Palma de Mallorca, Baleares, 07006 Chapter 1 other, lower-level services.

Through the BPEL console, it is possible to visually monitor the execution of BPEL process definitions. It is also possible to review audit trails and track transactions. The server also provides a BPEL Debugger, which simplifies the debugging of BPEL processes considerably. An important feature is native integration with Java Enterprise Edition, which simplifies inclusion of Java Enterprise Edition resources, such as EJB (Enterprise Java Beans), JMS (Java Message Service), JCA (Java Connector Architecture), or JDBC databases, through Web Services Invocation Framework (WSIF).

Such processes are executable by BPEL engines. Executable processes are important because they are the direct answer to the problem of business process automation through IT that we have discussed earlier in this chapter. With BPEL executable processes, we are able to specify the exact algorithm of service composition in a relatively simple and straightforward way, and execute it on a BPEL-compliant engine. Executable processes fill the gap between the business process specifications and the code responsible for their execution.

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