Transactions

• Transactions has boundaries similar to subProcess
• Transaction Activities can have a compensating Activities, in the above Cancel Flight compensate for Book Flight
• Transactions can be Compensated (rolled back) by either throwing an
  • Error Event during the transaction
  • Cancel Event during the transaction
  • Compensate Event after the transaction is completed

In this example:

• A conditional flow throw End Event:Throw Cancel Event (#14)
• Caused Boundary Event:Catch Cancel (#5) to be executed
• In turn continued to Process Cancelation (#22)
• Transaction is canceled (#3)