1. Copyright Springer Verlag Berlin Heidelberg 2004
The interaction between clients and services is often formed by a set of operation invocations (i.e., it is a conversation).
A service provider may support some conversations while disallowing others.
customer
(client)
supplier
(Web service)
1: requestQuote
2: orderGoods
3: makePayment
The internal business logic of clients and Web services must support the conversation, and maintain the state across different operation invocations belonging to the same conversation.
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2. Copyright Springer Verlag Berlin Heidelberg 2004
requestQuote
quote requested
orderGoods
goods ordered
cancelOrder
makePayments
order canceled
order completed
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3. Copyright Springer Verlag Berlin Heidelberg 2004
1:requestQuote
customer
2:orderGoods
supplier
3:confirmOrder
4:makePayment
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4. Copyright Springer Verlag Berlin Heidelberg 2004
1:requestQuote
customer
2:orderGoods
supplier
4:confirmOrder
5:makePayment
7:getShipmentDetail
3:checkShipAvailable
6:orderShipment
warehouse
8:confirmShipment
9:confirmShipment
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5. Copyright Springer Verlag Berlin Heidelberg 2004
customer
supplier
warehouse
requestQuote
orderGoods
checkShipAvailable
confirmOrder
makePayment
orderShipment
getShipmentDetail
confirmShipment
confirmShipment
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6. Copyright Springer Verlag Berlin Heidelberg 2004
customer
supplier
warehouse
requestQuote
(to supplier)
orderGoods
(to supplier)
checkShipAvailable
(to warehouse)
warehouse confirms
warehouse cancels
confirmOrder
(to customer)
cancelOrder
(to customer)
makePayment
(to supplier)
orderShipment
(to warehouse)
getShipmentDetails
(to customer)
confirmShipment
(to warehouse)
confirmShipment
(to supplier)
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7. Copyright Springer Verlag Berlin Heidelberg 2004
customer
supplier
warehouse
requestQuote
(to supplier)
orderGoods
(to supplier)
warehouse confirms
warehouse cancels
confirmOrder
(to customer)
cancelOrder
(to customer)
makePayment
(to supplier)
getShipmentDetails
(to customer)
confirmShipment
(to warehouse)
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8. service provider manufacturing health care telecom finance …
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service provider
Web services executing vertical protocols. The main focus of standards such as RosettaNet, xCBL, and part of ebXML is to describe protocols at this level.
manufacturing
health care
telecom
finance …
middleware for horizontal protocols provides properties and guarantees to the execution vertical protocols.
Standards such as WS-Coordination, WS-Transaction, and part of ebXML fit here.
support for protocols such as transactionality, reliability, security,…
other Web services middleware (e.g., SOAP routers)
SOAP messages

9. Copyright Springer Verlag Berlin Heidelberg 2004
service requestor P1
service provider
P2, P3
service requestor
P4, P5
service requestor
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10. service provider Copyright Springer Verlag Berlin Heidelberg 2004
object for P1 P1
service requestor P1
object for P2 P2
conversation controller P3
P2, P3
service requestor
object for P3 P4
P4, P5 P5
object for P4
service requestor
object for P5
the controller dispatches messages to the appropriate implementation object
clients invoke operations at the same address
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11. service provider EJB EJB EJB EJB container SOAP router
(with conversation controller)
conversation ID/object mapping
HTTP server
SOAP messages on HTTP transport
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12. service provider Copyright Springer Verlag Berlin Heidelberg 2004
object (Web service implementation)
object (Web service implementation) H B
horizontal protocol implementation B
service requestor
horizontal protocol implementation
conversation routing,
compliance verification H H
B: conversation compliant with a business protocol
H: conversation compliant with an horizontal protocol
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13. horizontal protocol handler (A) horizontal protocol handler (B)
object (W1)
horizontal protocol handler (A)
object (W2)
horizontal protocol handler (B)
A’s port reference
B’s port reference
A’s role
B’s role
conversation
controller
protocol messages
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14. Copyright Springer Verlag Berlin Heidelberg 2004
Web service
Web service
Web service
coordinator
(a) central coordination
Web service
Web service
Web service
coordinator
coordinator
coordinator
(b) distributed coordination
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15. Copyright Springer Verlag Berlin Heidelberg 2004
ActivationRequestorPortType
Web service
CreateCoordinationContext
- ...
- coordination type
- current context
CreateCoordinationContextResponse
- ...
- coordination context
- identifier
- coordination type
- registration service
ActivationCoordinatorPortType
coordinator
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16. Copyright Springer Verlag Berlin Heidelberg 2004
RegistrationRequestorPortType
Web service
register
- ...
- protocol identifier
- participant protocol service
registerResponse
- ...
- coordinator protocol service
RegistrationCoordinatorPortType
coordinator
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17. Copyright Springer Verlag Berlin Heidelberg 2004
XParticipantPortType
Web service
protocol-specific messages from participant to coordinator
protocol-specific messages from coordinator to participant
XCoordinatorPortType
coordinator
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18. activation coordinator registration coordinator
coordinator C
activation coordinator
registration coordinator
protocol coordinator
Web service A
Web service B
activation participant
protocol participant
activation participant
protocol participant
registration participant
Web service implementation
Web service implementation
registration participant
1. create CC
2. X1
3. register
4. protocol coordinator
5. operational message
6. register
7. protocol coordinator
8. protocol-specific message
9. protocol-specific message
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19. Copyright Springer Verlag Berlin Heidelberg 2004
Web service A
coordinator Ca
Web service B
coordinator Cb
1. create CC
2. X1
3. register
4. protocol coordinator
5. operational message
6. create CC
7. X2
8. register
9. register
10. protocol coordinator
11. protocol coordinator
12. protocol message
13. protocol message
14. protocol message
15. protocol message
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20. Copyright Springer Verlag Berlin Heidelberg 2004
XParticipantPortType
Web service n + 1
XParticipantPortType
XParticipantPortType
coordinator n
coordinator n + 1
XCoordinatorPortType
XCoordinatorPortType
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21. WS-Coordination interfaces
ActivationCoordinatorPortType
RegistrationCoordinatorPortType
WS-Transaction interfaces
CompletionParticipantPortType
CompletionCoordinatorPortType
CompletionWithAckParticipantrPortType
CompletionWithAckCoordinatorPortType
atomic transaction coordinator
PhaseZeroParticipantrPortType
PhaseZeroCoordinatorPortType
2PCParticipantPortType
2PCCoordinatorPortType
OutcomeNptificationParticipantPortType
OutcomeNptificationCoordinatorPortType
WS-Transaction interfaces needed for chaining
RegistrationParticipantPortType
WS-Coordination interfaces
needed for chaining
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22. Copyright Springer Verlag Berlin Heidelberg 2004
Web service A
coordinator Ca
Web service B
coordinator Cb
create CC T1
register for Completion
completion coordinator
operational message
create CC T2
register for PhaseZero
register for PhaseZero
PhaseZero coordinator
PhaseZero coordinator
register for 2PC
register for 2PC
2PC coordinator
2PC coordinator
complete
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PhaseZero
PhaseZero
PhaseZeroComplete
PhaseZeroComplete
prepare
prepare
prepared
prepared
commit
commit
committed
committed
completed

23. WS-Coordination interfaces
ActivationCoordinatorPortType
RegistrationCoordinatorPortType
WS-Transaction interfaces
BusinessAgreementParticipantPortType
BusinessAgreementCoordinatorPortType
BusinessAgreementWithCompleteCoordinatorPortType
BusinessAgreementWithCompleteParticipantrPortType
business activity coordinator
WS-Transaction interfaces needed for chaining
RegistrationParticipantPortType
WS-Coordination interfaces
needed for chaining
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24. Copyright Springer Verlag Berlin Heidelberg 2004
Web service A
Web service B
Web service C
Coordinator R
create CC A1
operational message
operational message
register for BusinessAgreement
BusinessAgreement coordinator
register for BusinessAgreement
BusinessAgreement coordinator
completed
faulted
compensate
forget
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25. :customer :product supplier start
<<SecureFlow>> price and availability response
<<RequestResponseActivity>> request price and availability
process price and availability request
<<SecureFlow>> price and availability request
[ fail ]
[ success ]
end
failed
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26. transport protocols (TCP/IP and others) HTTP SMTP other (future) HTTPS
SSL
preamble header
delivery header
service header
service content
attachment 1
attachment n
MIME multipart/related envelope
headers
business process payload
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