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Service Oriented Architecture (SOA)
Michael Herrmann
Applying Semantics within SOA
Michael Herrmann (ITP/AM) 2
Agenda
� Common understanding
� Definitions (selection) & Background
� Big Picture
� Services within SOA
� Enterprise Service Bus (ESB)
� EMEO
� Scenario I
� Scenario II
� WSDL-S
� Symbolic + Inference
� Summary
Michael Herrmann (ITP/AM) 3
“Introducing” my working area
Michael Herrmann (ITP/AM) 4
Definition
„SOA is a technology neutral concept of Software architecture that represents one
or more business functions as a service.
The interface description of a service is platform independent.
The implementations of the services are reusable, encapsulated and loosely coupled.
The service interactions are realized by a standardized/uniformed infrastructure.”
[DaimlerChrysler EMEA]
Michael Herrmann (ITP/AM) 5
SOA Big Picture
DB
SAPApplikation
Service Bus
J2EE/PAIApplikation
Service Bus
DB
.NETApplikation
Service Bus
DB
HostApplikation
Service Bus
DB
Registry Repository
HostS2
HostS1
.NETS2
.NETS1
IBMS2
IBMS1
HostS3
.NETS3
IBMS3
SAPS3
SAPS1
SAPS2
Process/
Workflow
Engine
Level 1-4 (eEPC)
Level 0 (VCD)Modeled
Business
Processnicht per
Hauspost
Auftrag zur
Auslieferung
Komponente
anschließen /
einbauen
Komponenten
abholen
En
terp
rise S
erv
ice B
us (E
SB
)En
terp
rise S
erv
ice B
us (
ES
B)
Registry Repository Registry Repository
Infrastructure LayerPlatform specific Business LayerEnterprise Business LayerPresentation Layer
Michael Herrmann (ITP/AM) 6
Services inside SOA
Michael Herrmann (ITP/AM) 7
Service within SOA
� A Service
� is a unit of third party composition
� has no (externally) observable state (encapsulates its state)
� is described platform independent (Interface)
� is potentially already deployed (deploy once, reuse several times)
� is Black Box reuse
� Business Service is a Service
� representing one ore more Business functions
Michael Herrmann (ITP/AM) 8
Enterprise Service Bus (ESB)
� Transport and content-based routing (Brokerage: Publish-Subscribe)
� Multi-protocol communication
� Validation and transformation (messages)
� Supports
� Event-handling
� Security (Partial Security on the message layer)
� Monitoring
� Adapter-connectivity
� Dynamic addressing and service binding (Registry)
� Mediation
Michael Herrmann (ITP/AM) 9
SOA & ESB
Michael Herrmann (ITP/AM) 10
SOA & ESB & Semantics?!
…reuse is depended upon the strengths of semantics…
Michael Herrmann (ITP/AM) 11
Semantics with SOA (Approaches)
� SAWSDL (Semantic Annotations for Web Services Description Language Working Group)
� WSDL-S (Web Service Semantics)
� OWL-S (OWL-based Web Service Ontology)
� WSMO (Web Service Modeling Ontology)
� AI Planning
� Semantic Discovery Service (SDS)
� …
Michael Herrmann (ITP/AM) 12
EMEO supports loose coupling
EMEO-Layer
OWL WSDL-S
WSDLMediation
Michael Herrmann (ITP/AM) 13
Lab based study „440-020“ (IOPE)
Trigger
Calculate
Start-Date
MAS+
Amount is
plausible
Start-Date
is
available
Job-
Controller
input:
(Code Number (SNR),
Amount,
Delivery-Date)
output: Start-Date
Michael Herrmann (ITP/AM) 14
Scenario I
Process Server
MAS+
Assembly
Job
Control
Service Provider 1
SOAP/ HTTP
ESB
WSDL_MAS_PLUS
WSDL_BZM
Lookup BZM
Model of
Operation
hours
Run-TimeDesign-Time
Service Provider 2
WID
Deploy
Publish
SOAP/ JMS
IP address
Port
Knowledge
Michael Herrmann (ITP/AM) 15
Scenario II (including EMEO)
Process Server
MAS+
Assembly
Job
Control
Service Provider 1
SOAP/ HTTP
ESB
WSDL_MAS_PLUS
WSDL_BZM
Lookup BZM
Model of
Operation
hours
Run-TimeDesign-Time
Service Provider 2
Ontology
WID
Reasoner
Deploy
Inference
SOAP/ HTTP
- Now() > 10am or Now() <= 10am
- Availability (repair work)
- Traffic
Publish
SOAP/ JMS
SOAP/ JMS
Interface-Map
Michael Herrmann (ITP/AM) 16
WSDL within EMEO
abstract description
concrete description
Michael Herrmann (ITP/AM) 17
WSDL-S within EMEO
Michael Herrmann (ITP/AM) 18
Connecting WSDL to OWL over WSDL-S
XML Schema
WSDL
OWL
XSL
modelReference
effect, precondition,
category
schemaMapping
simpleTypecomplexType
Bottom Level
Top Level
modelReference
modelReference
references / uses
operations (modelReference)
inputs and outputs
Michael Herrmann (ITP/AM) 19
Connecting WSDL to OWL over WSDL-S (exemplary)
XML Schema / WSDL WSDL-S OWL
WSDL
Michael Herrmann (ITP/AM) 20
WSDL-S @ DaimlerChrysler (Lab Approach)
Schema
OWL Ontology
OWL Ontology
Michael Herrmann (ITP/AM) 21
Splitting our Domain into Areas
Michael Herrmann (ITP/AM) 22
Symbol stuff (extract)
Michael Herrmann (ITP/AM) 23
Inference (Protégé + RACER)
Michael Herrmann (ITP/AM) 24
Protégé (OWL Viz)
Michael Herrmann (ITP/AM) 25
Summary
� SOA is not JABOWS (“Just A Bunch of Web Services”)
� The Enterprise Service Bus (ESB) is not magic
� Semantics become more important in future
� Results are based on Lab
Michael Herrmann (ITP/AM) 26
Contact
Michael Herrmann
DaimlerChrysler AGHPC G206 - ITP/AM Technology & Methods MCG
Building Beuttler, Room 0.045Fronäckerstraße 40, 71059 Sindelfingen
Phone: +49 70 31 / 90-8 99 29
michael.hm.herrmann@daimlerchrysler.com
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