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ODE Instance Migration Techniques for Distribution, Modification and Updating
1.
ODE Instance Migration
Hanna Eberle, Tammo van Lessen, Tobias Unger University of Stuttgart Institute of Architecture of Application Systems (IAAS) © IAAS 1
2.
Outline
1 Introduction 2 BPEL Related Stuff 3 ODE Related Stuff © IAAS 2
3.
Motivation
Migration Update to an new ODE version In mobile computing people takes their instances with them across devices and infrastructures Modification Adding additional steps to an already running instance Adapting running instances to a new version of the process model Distribution Dynamic outsourcing of parts of already running instances Function vs. Data shipping In distribution and modification scenarios instance modification implies modification of process model © IAAS 3
4.
Approach
Problem Each scenario requires sophisticated modifications of the ODE engine Overlapping functionallity Solutions Generic instance format based on XML ODE interface for importing and exporting instances Components controlling modification, distribution, or migration can be realized separated from the ODE engine ODE engine has to be modified only once © IAAS 4
5.
Vision
Distribution Apache ODE BPEL OModel Compiler Process Instance BPEL Runtime Axis2 Management & JACOB DAOs JBI Events SCA Migration to other Server Hiber Open Scheduler … nate JPA DB Apache ODE Process Instance BPEL Apache ODE OModel Compiler BPEL OModel Compiler Process Instance BPEL Runtime BPEL Runtime Axis2 Axis2 Management & Management & JACOB DAOs JACOB DAOs JBI Events JBI Events SCA Hiber Open SCA Scheduler Hiber Open … nate JPA Scheduler … nate JPA DB DB Process Instance Process Instance Apache ODE BPEL Compiler OModel Modification BPEL Runtime Axis2 Management & JACOB DAOs JBI Events SCA Hiber Open Scheduler … nate JPA DB © IAAS 5
6.
Metamodel View
Defining a XML-schema based metamodel for process instances Activity Link Defined using XML- Process (Modeling) Language (BPEL) Schema Described by A3 e.g. Medication Modeled using XML- A1 A4 Process Model A2 Flow File Currently, instance is stored A3 Described by A1 A4 e.g. Patient = Bill in an engine dependent A2 format (e.g. Java objects Process Instance and/or database) What we want to add… Process Instance XML-File containing a process instance based on a well defined XML-File format (XML-Schema) © IAAS 6
7.
Outline
1 Introduction 2 BPEL Related Stuff 3 ODE Related Stuff © IAAS 7
8.
Example Process
Model Process Instance Process Instance XML id=1 <bpelinstance id=quot;2quot;> Sequence Sequence <state>running</state> id=2 … Empty Empty </bpelinstance> id=3 While While id=4 Flow Flow id=5 Invoke1 Invoke1 true id=6 Invoke2 Invoke2 id=7 Flow id=8 Invoke1 © IAAS 8
9.
Import and Export
Export Import Trigger Suspending Export Import Resume Instance Activities Instance Instance Instance Suspension Idea: Import and export of suspended process instances Problems Suspending to a save state Suspension of Wait, Pick (Receive) Running request-response invocations Maybe activity cannot be suspended Event Handler, FCT-Handling Which activities can be suspended? Which must be continued until completed state? © IAAS 9
10.
Instance Format –
Possible Content Important content Activity instances (state, IDs, etc.) Variable data Message exchanges Depends on Binding (JMS vs. HTTP) Correlation sets Link states Snapshots History Process Model must be integrated optionally Not sure whether process model is present at target engine © IAAS 10
11.
Models to be
defined State model for BPEL Model for representing instances © IAAS 11
12.
Outline
1 Introduction 2 BPEL Related Stuff 3 ODE Related Stuff © IAAS 12
13.
ODE Implications
Compiler Implicit scopes (E.g. invoke) Deployment Deployment descriptor State mapping Activity and process states ODE Extensions REST External variables … © IAAS 13
14.
Where to Collect
Information about/within ODE Process Management API Using test process (long running wait activity) Code Review Process (Instance) States Debugging Using Management API and test process © IAAS 14
15.
ODE Process (Instance)
States Process States org.apache.ode.bpel.iapi.ProcessState ACTIVE RETIERED DISABLED Process Instance States org.apache.ode.bpel.common.ProcessState STATE_NEW = 0 STATE_READY = 10 STATE_ACTIVE = 20 STATE_COMPLETED_OK = 30 STATE_COMPLETED_WITH_FAULT = 40 STATE_SUSPENDED = 50 STATE_TERMINATED = 60 © IAAS 15
16.
ODE Activity Instance
States org.apache.ode.bpel.pmapi.TActivityStatus static final Enum ENABLED = Enum.forString(quot;ENABLEDquot;); static final Enum STARTED = Enum.forString(quot;STARTEDquot;); static final Enum COMPLETED = Enum.forString(quot;COMPLETEDquot;); static final Enum FAILURE = Enum.forString(quot;FAILUREquot;); static final Enum DEAD = Enum.forString(quot;DEADquot;); © IAAS 16
17.
ODE Scope Instance
States org.apache.ode.bpel.dao.ScopeStateEnum ACTIVE FAULTED FAULTHANDLER COMPLETED COMPENSATING COMPENSATED © IAAS 17
18.
Management API –
Activity Info getScopeInfoWithActivity <ns:activity-info> <ns:name>receiveInput</ns:name> <ns:type>OPickReceive</ns:type> <ns:aiid>3</ns:aiid> <ns:status>COMPLETED</ns:status> <ns:scope modelId=quot;0quot; name=quot;__PROCESS_SCOPE:Waitquot; siid=quot;201quot;/> <ns:dt-enabled>2009-04-08T13:34:01.760+02:00</ns:dt-enabled> <ns:dt-started>2009-04-08T13:34:01.760+02:00</ns:dt-started> <ns:dt-completed>2009-04-08T13:34:01.892+02:00</ns:dt-completed> </ns:activity-info> © IAAS 18
19.
Management API –
Instance Info getInstanceInfo <instance-info> <ns:iid xmlns:ns=quot;http://www.apache.org/ode/pmapi/types/2006/08/02/quot;>151</ns:iid> <ns:pid xmlns:ns=quot;http://www.apache.org/ode/pmapi/types/2006/08/02/quot;>{http://iaas.de}Wait- 4</ns:pid> <ns:process-name xmlns:ns=quot;http://www.apache.org/ode/pmapi/types/2006/08/02/quot; xmlns:iaas=quot;http://iaas.dequot;>iaas:Wait</ns:process-name> <ns:root-scope siid=quot;201quot; status=quot;ACTIVEquot; name=quot;__PROCESS_SCOPE:Waitquot; modelId=quot;3quot; xmlns:ns=quot;http://www.apache.org/ode/pmapi/types/2006/08/02/quot;/> <ns:status xmlns:ns=quot;http://www.apache.org/ode/pmapi/types/2006/08/02/quot;>FAILED</ns:status> <ns:dt-started xmlns:ns=quot;http://www.apache.org/ode/pmapi/types/2006/08/02/quot;>2009-04- 08T13:34:01.000+02:00</ns:dt-started> <ns:dt-last-active xmlns:ns=quot;http://www.apache.org/ode/pmapi/types/2006/08/02/quot;>2009-04- 08T13:44:02.000+02:00</ns:dt-last-active> <ns:event-info xmlns:ns=quot;http://www.apache.org/ode/pmapi/types/2006/08/02/quot;/> <ns:fault-info xmlns:ns=quot;http://www.apache.org/ode/pmapi/types/2006/08/02/quot;> <ns:name xmlns:exec=quot;http://docs.oasis- open.org/wsbpel/2.0/process/executablequot;>exec:uninitializedVariable</ns:name> <ns:explanation xsi:nil=quot;truequot; xmlns:xsi=quot;http://www.w3.org/2001/XMLSchema-instancequot;/> <ns:line-number>65</ns:line-number> <ns:aiid>20</ns:aiid> </ns:fault-info> </instance-info> © IAAS 19
20.
Literature
Karastoyanova, Dimka; Khalaf, Rania; Schroth, Ralf; Paluszek, Michael; Leymann, Frank: BPEL Event Model, Technical Report No. 2006/10 (will be updated soon) © IAAS 20
21.
End of Document