Executing.Bpmn.Eclipscon.2009

Executing BPMN

Presented by
Koen Aers

1 Executing BPMN © 2009 by Koen Aers; made available under the EPL v1.0

Speaker

 Koen Aers
 JBoss, a Division of Red Hat
 JBoss jBPM (http://labs.jboss.org/jbossjbpm or http://jbpm.org)
 JBoss Tools (http://labs.jboss.org/tools)
 => Graphical Process Designer
(http://labs.jboss.org/jbossjbpm/gpd)
 Blog: http://koentsje.blogspot.com


Agenda

 The BPM Jungle
 BPMN Overview
 BPMN Execution Semantics
 jBPM and jPDL
 Executing BPMN with jBPM


Agenda

 The BPM Jungle
 BPMN Overview
 jBPM and jPDL


Business Process Management


Business Process Modeling
 Business Process Model:
 Model of one or more
business processes
 Defines how operations are
carried out
 Describes workflow or
integration
 Abstract!
 Workflow == depiction of a
sequence of operations
 (Software?) Engineering
discipline


Business Process Execution
 Aspect of software expressed
as a graph
 Execution 'flow'
 BPMS 'runs' process
executions
 Software:
– DSL
– Execute on one system
– Central dispatching
– Multiple participants
– Wait states
 BUT: Seven Fallacies of
Process Execution!


BPM Standards
 1995:  OMG:
 1 standardization group for  CORBA WF, BPMN, BPDM
workflow models  OASIS:
 Reference model + 5  ebXML (or BPSS), BPEL
interface standards  WfMC:
 Size of the average  XPDL, Wf-XML
specification : +/- 40 pages
 2007:
 10+ working groups with
interest in BPM
 7+ standards for process
models alone
 Size of the average
specification: +/- 150 pages


Agenda

 The BPM Jungle
 BPMN Overview
 jBPM and jPDL


Process Instantiation
 When one of the start events occurs
 Via event based gateway without incoming sequence flow
 Each occurring start event creates token on outgoing sequence
flow

E1 A1

E2 A2 G2

E3

G1 E4 A3

E5


Process Termination
All start nodes are visited

No remaining tokens for process instance

No active activities

=> All tokens must have reached an end node


A1 E1

G1 A2 E2

A3 E3


Sequence Flow
 Multiple incoming sequence
flow
A1
 Exclusive gateway

 Activity without incoming
sequence flow
A2
 Instantiated when process
instance is created

 Multiple outgoing sequence
flow A3
 Token created for each flow
 Conditional sequence flow


Tasks


Gateways
 Parallel gateway
 Synchronize concurrent
branches
 Spawn new concurrent paths
of execution
 Semantics
 At least one token on each
incoming sequence flow
 Consumes exactly one token
for incoming and produces
exactly one token for
outcoming sequence flow


Events
 Start events
 Start the process
 Intermediate events
 Wait until the event occurs
 Intermediate boundary events
 Consume event and execute event handler
 End events
 Terminate ends the process abnormally
 Other events execute their behaviour (e.g. Sending message) and
then end the process if
 All start nodes have been visited
 No tokens are remaining


Agenda

 The BPM Jungle
 BPMN Overview
 jBPM and jPDL


jBPM and the PVM
 jBPM is a platform for process languages
 Process Virtual Machine (PVM) is common substrate
 jPDL, BPEL, XPDL are implemented on top

jBPM

jPDL BPEL Pageflow XPDL ...

Process Virtual Machine (PVM)


jBPM Evolution jBPM 4
• Activity Pluggability API

Product • Command Based Services
•Multiple Languages
• Many Execution modes
• DB Partitioning
• DB Evolution
• Full Embeddability

Project jBPM 3
• First Activity Pluggability
• First Multiple Languages
• First Enterprise Embeddability

jBPM 2
• Std Java Embeddable
• Hibernate state machine
jBPM 1
• EJB state machine


jPDL Example
<process name=quot;Orderquot; >

<start>
<transition to=quot;forkquot;/>
</start>

<fork name=quot;forkquot;>
<transition to=quot;send invoicequot;/>
<transition to=quot;load truckquot;/>
<transition to=quot;print shipping documentsquot;/>
</fork>

<state name=quot;send invoicequot;>
<transition to=quot;final joinquot;/>
</state>

…


jPDL Characteristics
 Open ended
 Base process language can be extended
 API for runtime behaviour
 Enriches Java
 Extracts state management
 Process == structure
 Code as decoration
 Embeddable
 Libraries
 Database and AS agnostic
 Standard & Enterprise Java


Analist – Developer's Bridge

Your App
Your Architecture
Business
Analyst
jBPM

Developer


Agenda

 The BPM Jungle
 BPMN Overview
 jBPM and jPDL


jBPM 3
 BPMN to jPDL conversion
 Based on diagrams from the Eclipse BPMN project
 Translation to basic (underspecified) jPDL
 Technical details are added in jPDL editor


BPMN Skin on jPDL

c


Starting and Ending Processes
 Only one start event per  Multiple end events are
process possible
 Currently end event ends the
entire process


Sequence Flow
 One outgoing sequence flow is always unconditional
 Multiple outgoing sequence flows
 No implicit fork behaviour
 Outgoing sequence flows are always conditional


Branching and Merging
 Fork  Join
 One incoming sequence flow  Multiple incoming sequence
flows
 Multiple outgoing sequence
flows  One outgoing sequence flow

c


Superstates
 Phases in a process
 Ad hoc tasks?
 New artefact?


BPMN on the PVM
 Native execution
 No mapping issues
 Targeted post jBPM 4 GA

jBPM

BPMN
jPDL BPEL Pageflow XPDL ...

Process Virtual Machine (PVM)


Conclusions
BPM is still a jungle

BPMN is very promising

Execution semantics and compliance are still fuzzy

BPMN builds on the same ideas as jBPM and jPDL

Two possibilities of executing BPMN with jBPM



Executing.Bpmn.Eclipscon.2009

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