A BPEL _____________ is needed to support nonidempotent application service

Question

Options

• Acompensation handler
• Bthrow block
• Cswitch construct
• Dexception handler

• A
  85% (17)
• C
  5% (1)
• D
  10% (2)

Explanation

Explanation: If a scope requires a compensation handler, the service that requires compensation should be marked as non-idempotent by setting the "idempotent" property value to "false." This will cause Oracle BPEL Process Manager to start a new transaction after invoking the non-transactional resource. Note: BPEL includes the concept of an invocable Compensating Transaction. This is similar to an exception handler, and is defined at the scope level. However, it is explicitly invoked only by the "Compensate" activity. Compensation is intended to allow the application of reversing operations to systems that cannot participate in transactions, or when it has been decided that the systems should not operate as part of transactions. For example, a Web Service might allow inventory to be decremented, but an error makes it necessary to roll back the process. In this case, a compensation handler would be defined to call the Web Service to increment the inventory, effectively providing a reversing transaction. This allows you to define rollback activities and associate them with the code that performs the operations that may need to be reversed. This is also very useful in that it allows some exceptions to be handled without undoing all of the work. activity or an invoke activity). The instance is saved after a nonidempotent activity. This property is applicable to both durable and transient processes.

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