WS-BPEL 2.0 for SOA Composite Applications with IBM WebSphere 7

Matjaz B. Juric, Swami Chandrasekaran, Ales Frece, Gregor Srdic, Matej Hertis

Language: English

Pages: 644

ISBN: 1849680469

Format: PDF / Kindle (mobi) / ePub

This book is a comprehensive guide that shows developers how to design and develop business processes in BPEL efficiently. Throughout the book the authors discuss important concepts and offer real-world examples covering the IBM WebSphere SOA platform. This book is aimed at SOA architects and developers involved in the design, implementation, and integration of composite applications and end-to-end business processes. It provides comprehensive coverage of WS-BPEL 2.0 for implementing business processes and developing SCA composite applications, dealing with the issues of composition, orchestration, transactions, coordination, and security. It uses IBM WebSphere SOA platform version 7.0. To follow this book you need to have basic knowledge of XML, web services, and Java EE. You should also be familiar with basic concepts of Business Process Management (BPM).

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process and requires portType B from the process. [ 64 ] Chapter 2 Partner link types Describing situations where the service is invoked by the process, and vice versa, requires selecting a certain perspective. We can select the process perspective and describe the process as requiring the portType A on the service and providing the portType B to the service. Alternatively, we select the service perspective and describe the service as offering portType A to the BPEL process and requiring

the EmployeeTravelStatusResponse variable: The next step is to invoke both the Airline web services. Again, we first prepare the required input message (which is equal for both the web services). The

the will be selected. [ 125 ] Advanced BPEL We can see that the selection of the activity within fault handlers is quite complicated. It may even happen that a fault matches several activities. Therefore, BPEL specifies exact rules to select the fault handler that will process a fault: • For faults without associated fault data, the fault name will be matched. The activity with a matching faultName will be selected, if present; otherwise, the default

and is not present, the fault will be rethrown to the immediately enclosing scope, if present. Otherwise, the process will terminate abnormally. This situation is similar to explicitly terminating the process using the activity. Synchronous example Let's go back to the synchronous BPEL travel process example to add a fault handlers section. We need to define a fault handler that will simply signal the fault to the client. In real-world scenarios, a fault handler can perform

compensation handlers Compensation handlers can be invoked only after the activity that is to be compensated has completed normally. If we try to compensate an activity that has completed abnormally, nothing will happen, because an activity will be invoked. This is useful, because it is not necessary to track the state of activities to know which can be compensated and which cannot. BPEL provides two activities to invoke a compensation handler: • activity to start

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