This document discusses complex gateways and error handling in business processes. It describes the different types of gateways - AND, XOR, OR - and how they handle multiple incoming and outgoing branches. It also explains how complex gateways can implement custom rules. The document then covers error events, which stop a process branch, and escalation events, which can throw events to handle a condition outside normal flow or continue processing without stopping. It provides examples of using complex gateways and handling exceptions.

1. Chapter 4
Part1
Handling complexity
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2. Complex Gateway
2
AND OR XOR

3. 3
proceeds
incoming
incoming
outgoing
ongoing

4. Gateways
4
AND
AND-Split  takes all
outgoing branches
AND-join  proceeds
when all incoming
branches have completed

5. Gateways
5
XOR-split  takes ONE
outgoing branch
XOR-join  proceeds
when ONE incoming
branch has completed
XOR
Condition 1
Condition 2

6. Gateways
6
OR-split  takes ONE/MORE
outgoing branches depending
on condition
OR-join  proceeds when all
ACTIVE incoming branches
have completed
OR
Condition 1
Condition 2

7. Gateways
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A Complex Gateway allows the modeler to specify any
random rules needed to determine how to produce tokens
or process arriving tokens.
Complex gateway
Dead Path Elimination.
+
Business Rule

8. Complex Split
Complex Gateway
An example of the use of a complex gateway.
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9. Complex Merge
Complex Gateway
Questionable usage of the complex merge gateway.
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10. Complex Merge
Complex Gateway
A complex merge pattern solved with explicit merge points.
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11. A complex merge pattern using a subprocess.
Complex Merge
Complex Gateway
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12. 12
The Error and Escalation events are similar in that they provide a way to stop
an ongoing subprocess and change the course or correct a situation.
Escalation event can also throw events and continue processing without
stopping the process or subprocess.
Escalation represent a planned condition created inside the process that must
be handled outside the normal flow
Error events always stop the branch of the subprocess that they are on.
Events And Error Handling
Error events & Escalation Events
Error Escalation

13. Events And Error Handling
Error events
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14. 14
Events And Error Handling
Escalation Events

15. 15
Events And Error Handling
Escalation Events

16. 16
Events And Error Handling
Escalation Events

17. 17
Events And Error Handling
Basic exception handling flow.

18. 18
Thank You