Modeling BPMN 2.0
Level 2
Lubomír Hruban
l.hruban@gmail.com
Seminar Overview
• Introduce BPMN Level 2 modeling and its palette
• Extending L1 process to L2
○ PV207/Seminars/Pizza_L2_Bug_free.bpmn
• Remarks on modeling
• Summary
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Level 2 Modeling
• Also known as analytical modeling
• Created by process specialists
• Still concerned with non-executable processes
• Relies on information visible in the diagrams
• Adds events, additional gateways, subprocess nesting
• Often used for exception handling
• From activity order (L1) to precise execution timing (L2)
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L2 Palette
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● Intermediate events
● More specific types of tasks
○ User
○ Service
○ Abstract
○ Send
○ Receive
○ Manual
○ Script
○ Business rule
● Event and complex gateway
● Iterations in multiple instances
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We have gathered more information after detail interviews:
● chef can prepare more pizzas
● sometimes bank doesn’t respond to our transaction request, if that
happens then IT needs to resolve this as a standard issue (and if it takes
more than 5 minutes we have to inform customer and cancel the process)
● customer can cancel order while chef prepare only ingredients, but not
while pizzas are prepared
● bank can respond that customer’s credit is not enough, in that case bill
generation is interrupted
● Synchronize process: check credit through bank, only if order wasn’t
cancelled; prepare pizza only if customer was charged without errors
Extension
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Message events
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● Message is the content of communication between
two different participants (not in the same process)
● Message can take any form
● Message flow is addressed to a particular process or
process instance
● Use verbs like send or receive as a keywords
6
Hidden message flow
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Avoid this:
When handling is
non-trivial activity:
7
Signal events
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● Signal is broadcast and it is loosely coupled
● Can be used within pool, between processes and
process instances
● In diagram there is no message flow between
signals (only naming emphasizes relationship)
● Signal start event means that process is subscribed
to another process or processes
Error events
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● Only as Error end event or interrupting Error
boundary event
● Can be usually transform with usage of XOR
gateway:
Loop transformation
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Summary
● Understand purpose and usage of BPMN L2
● Extend process from L1 to L2
● More familiar with the most common L2
elements
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Thank you for your attention!
Lubomír Hruban
l.hruban@gmail.com