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jBPM 4 Sneak Preview

Tom BaeyensJBoss, Red Hat

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JBoss jBPM• Business Process Management

– BPM as a discipline– BPM as software engineering

• What is jBPM• jBPM 4 Overview

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Tom Baeyens• Lead and founder of JBoss jBPM• Consulting for numerous BPM projects• Bringing BPM mainstream• Articles

– InfoQ, TSS, Dzone, OnJava,…• Blogs

– http://processdevelopments.blogspot.com/• Talks

– JavaOne, JBossWorld, JAOO, TSS,…

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BPM as a Discipline• Management discipline• Business processes grow organic

– Understand– Describe– Optimise

• Non technical• People to people

– What, not how– Can be vague

• Unrelated to software architecture• Often include diagrams

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BPM as Software Engineering• Aspect of software expressed as a graph• Specifies execution flow• BPMS ‘runs’ process executions• It’s software

– DSL– Executes on one system– Central dispatcher– Multiple participants– Wait states

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Traditional BPM Vendors• Stack Integrators

– Oracle, IBM, SAP– XML basis for BPM ?!– BPEL, WSDL Lots of tooling required to hide clumsy basics Deprecating BPEL in favour of BPMN

• Pure plays– Monolithic server– Automagical– Hard to integrate in your project

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jBPM !• Bottom Up

– No magic• Server or embedded

– Not monolithic– Just a library

• Freedom– Use the most appropriate tech

• Java, groovy, web services, SQL– Java excellent dispatcher technology

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Your AppYour Architecture

jBPM’s Modelling Advantage

jBPM

BusinessAnalyst

Developer

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Your AppYour Architecture

jBPM’s Modelling Advantage

jBPM

BusinessAnalyst

Developer

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jBPM Overview• Process Virtual Machine

– Java state machine library– Pluggable Activities

• jPDL– BPM as a discipline– Orchestrating Human Tasks & Services– Transactional Script– Execution modes

• SEAM Pageflow• …

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jPDL Activities• Control flow

transition start end end-cancel end-error decision fork join super-statesub-process

• Functionalstate sub-process task java script esb hql sql

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jPDL Features• Lots of functional activities

– mail, java, esb, task,…• Concurrency• Event listeners• Timers• Asynchronous continuations• Transactional exception handlers

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State Choice

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State Choice<process name="StateChoice">

<start> <transition to="wait for response"/> </start>

<state name="wait for response" > <transition name="accept" to="submit document" /> <transition name="reject" to="try again" /> </state>

<state name="submit document" /> <state name="try again" />

</process>

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State ChoicerepositoryService.createDeployment() .addResourceFromClasspath( "org/jbpm/examples/state/choice/process.jpdl.xml“) .deploy();

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State ChoiceProcessInstance processInstance = executionService .startProcessInstanceByKey("StateChoice"); String executionId = processInstance .findActiveExecutionIn("wait for response") .getId();

processInstance = executionService .signalExecutionById(executionId, "accept"); assertEquals("submit document", processInstance.getActivityName());

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Human Task

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Human Task<process name="TaskCandidates">

<start> <transition to="review" /> </start>

<task name="review" candidate-groups="sales-dept"> <transition to="wait" /> </task> <state name="wait" />

</process>

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LDAP

Identity Component

jBPM

Identity Component Interface

jBPMbuild-in

JBossIDM

Your own custom

implementation

3 10

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Identity Component

johndoe

joesmoe

sales-dept

membership

membership

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Human TaskexecutionService .startProcessInstanceByKey("TaskCandidates");

List<Task> johnsTakableTasks = taskService.findTakableTasks("johndoe");

List<Task> joesTakableTasks = taskService.findTakableTasks("joesmoe");

taskService.takeTask(task.getDbid(), "johndoe");

List<Task> johnsPersonalTasks = taskService.findAssignedTasks("johndoe");

taskService.completeTask(task.getDbid());

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Timer Transition

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Timer Transition<process name="TimerTransition">

<start> <transition to="guardedWait" /> </start>

<state name="guardedWait"> <transition name="go on" to="next step" /> <transition name="timeout" to="escalation"> <timer duedate="2 business days" /> </transition> </state> <state name="next step" />

<state name="escalation" />

</process>

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Asynchronous Continuations• Automatic activities in sequence• One takes a long time• Don’t block the client thread• async=“true”

Transaction 1 Transaction 2

JobExecutor

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Designer

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Console

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Console

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Conclusion• jBPM provides overview of application

– External triggers– Wait states– Business view

• jBPM adds a layer on top of TX basics– Transactional timers– Asynchronous messages

• Integrates with – Standard & Enterprise Java– JBoss and other app servers– SEAM– Spring

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Q&A

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Execution Modes

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Execution Modes

Processes

Executions

History

JVMBPM Engine (1)

Persistent Dynamic

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Execution Modes

Executions

History

JVMBPM Engine

ProcessResources

(2)Persistent

Process resource

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Execution Modes

Executions

History

JVMBPM Engine

INSURANCE_CLAIMSID … STATE …

ProcessResources

(3)PersistentEmbeddedReferenced

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Execution Modes

History

JVMBPM Engine

INSURANCE_CLAIMSID … STATE …

ProcessResources

(4)PersistentEmbeddedIncluded

“review”

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Execution Modes

History

JVMBPM Engine

ProcessResources

ExecutionObjects

(5)Memory

With Persistent History

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Execution ModesJVM

BPM Engine

ProcessResources

ExecutionObjects

(6)Memory

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Process Concurrency