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The Eighth International Conference on Service Oriented Computing (ICSOC 2010)
                                       http://www.icsoc.org/




                                Fault Handling in the
                                 Web Service Stack



                                 Oliver Kopp, Frank Leymann, Daniel Wutke
                           Institute of Architecture of Application Systems (IAAS)
                                          www.iaas.uni‐stuttgart.de




presented by Oliver Kopp                                               www.compas‐ict.eu   1
Agenda

      Background

      Fault Classification

      Implemented Fault Propagation

      Conclusion and Outlook




presented by Oliver Kopp              2
Background

      Context:
              Web Services (WS‐*)
              Processes as orchestrations of Web Services (WS‐BPEL)
                      Web Services Business Process Execution Language
      Concrete Setting:
              Networked interactions
              Communication faults
      Assumption:
              No runtime environment failures
              Components correctly implemented by themselves



presented by Oliver Kopp                                                 3
Fault Classification
Web Service Stack

                                                                                    BPEL             WS‐C, …
               Components
                                                     Atomic                               Composite

                Quality                   WS‐Reliable                    WS‐AT,
                                                                                                WS‐Security
                of Service                Messaging                      WS‐BA

                Description                          WSDL                                  WS‐Policy


                Messaging                 SOAP             WS‐Adressing                   JMS                …




                                                                                                                              “Binding”
                Transport                HTTP          SMTP           RMI/IIOP              JMS              …


                Communication                                     TCP/IP                                     …


                             Curbera, F. et al.: Web Services Platform Architecture: SOAP, WSDL, WS‐Policy, WS‐Addressing, WS‐BPEL, 
presented by Oliver Kopp     WS‐Reliable Messaging and More. Prentice Hall PTR (2005)                                                     5
Message Passing Through the Layers

 Components (BPEL)

                             A    Q                        I
 Quality of Service
 (WS‐Reliable Messaging)
                             B    P                       H    J

 Messaging (SOAP)

                             C    O                       G K

 Transport (HTTP)

                             D    N                        F   L

 Communication (TCP/IP)

                            Sending          E           Receiving
                           Application            M     Application
presented by Oliver Kopp                 Default flow    Exception flow   6
Component
Communication Layer                                               Quality of Service
                                                                  Messaging
      All protocols and mechanisms of                             Transport
      OSI Layered Network Model Layers 1 to 6                     Communication
      Examples of faults (TCP/IP)
              Connectivity faults (arc E)
              Data integrity faults (arcs E and M)




   Transport (HTTP)
                                    D                      L
                                        N              F
                                               E
    Communication (TCP/IP)                      M
                                  Sending            Receiving
presented by Oliver Kopp         Application        Application                    7
Component
Transport Layer                                                     Quality of Service
                                                                    Messaging
      OSI Layered Network Model layer 7                             Transport
      Examples of faults (HTTP)                                     Communication
              4xx Client‐side faults
                      403 Forbidden
              5xx Server‐side faults
                      503 Service Unavailable


   Messaging (SOAP)
                                          C                  K
                                                O       G
   Transport (HTTP)
                                          D                  L
                                                N        F
   Communication (TCP/IP)

                                         Sending       Receiving
presented by Oliver Kopp                Application   Application                    8
Component
Messaging Layer                                             Quality of Service
                                                            Messaging
      SOAP processing                                       Transport
      Examples for faults                                   Communication
              MustUnderstand fault
              Sender fault
              Receiver fault


   Quality of Service (WS‐RM)
                                  B                 J
                                       P        H
   Messaging (SOAP)
                                  C                 K
                                       O        G
   Transport (HTTP)


                                 Sending       Receiving
presented by Oliver Kopp        Application   Application                    9
Component
Quality of Service Layer                                    Quality of Service
                                                            Messaging
      Reliable Transfer of Messages                         Transport
      i.e., at least once semantics                         Communication
      Implemented by sequences of numbers
      If sequence is not acknowledged in time, a 
      SequenceTerminated fault is propagated

   Components (BPEL)
                                  A
                                       Q         I
   Quality of Service (WS‐RM)
                                  B                  J
                                       P        H
   Messaging (SOAP)


                                 Sending       Receiving
presented by Oliver Kopp        Application   Application                    10
Component
Component Layer                                                   Quality of Service
                                                                  Messaging
      Faults: No communication faults                             Transport
      Faults described by component interface                     Communication
      (WSDL)
              Sent back to the caller
      Faults occurring in the component implementation
              Specified ways for interface layer faults
              No specified ways to treat faults on lower layers

    Components (BPEL)
                                    A
                                        Q          I
    Quality of Service (WS‐RM)
                                  Sending        Receiving
                                 Application    Application
presented by Oliver Kopp                                                           11
Message Passing Through the Layers

 Components (BPEL)

                             A    Q                           I
 Quality of Service
 (WS‐Reliable Messaging)
                             B    P                          H    J

 Messaging (SOAP)

                             C    O                          G K

 Transport (HTTP)

                             D    N                           F   L

 Communication (TCP/IP)

                            Sending          E SOAP         Receiving
                           Application            M
                                            Intermediary   Application
presented by Oliver Kopp                 Default flow       Exception flow   12
Implemented Fault Propagation
Implementation Inspected

  Components (BPEL)            ODE



  Quality of Service         Sandesha
  (WS‐Reliable Messaging)
                               Axis 
  Messaging (SOAP)



  Transport (HTTP)             HTTP 
                            Components


  Communication (TCP/IP)      java.io



                            Application
presented by Oliver Kopp                  14
Apache ODE

      BpelRuntimeContext
              Key object to call required functionality
              invoke method
      SoapExternalService
              Axis2: OutInAxisOperationClient
      Java Exception: failure method of parent
      SOAP fault: completed method of parent




presented by Oliver Kopp                                  15
Axis 2 Architecture

      AxisFault                                     MessageContext




                                                                             AbstractMessageReceiver


OutInAxisOperationClient                                  HTTPTransportReceiver

                                                                             SandeshaInHandler
              SandeshaOutHandler

                                             CommonsHTTPTransportSender
presented by Oliver Kopp   http://ws.apache.org/axis2/1_4_1/userguide.html                         16
Conclusions and Outlook
Conclusions and Outlook

      Overview on the fault handling on all layers
      in the Web service Stack

      Overview on one implementation



      Coordinating distributed fault handling using BPEL
              BPEL‐based SOAP routing
              Scheibler, T.; Karastoyanova, D. & Leymann, F.
              Dynamic Message Routing Using Processes, KiVS 09, Springer, 2009




presented by Oliver Kopp                                                         18

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Fault handling in the web service stack

  • 1. The Eighth International Conference on Service Oriented Computing (ICSOC 2010) http://www.icsoc.org/ Fault Handling in the Web Service Stack Oliver Kopp, Frank Leymann, Daniel Wutke Institute of Architecture of Application Systems (IAAS) www.iaas.uni‐stuttgart.de presented by Oliver Kopp www.compas‐ict.eu 1
  • 2. Agenda Background Fault Classification Implemented Fault Propagation Conclusion and Outlook presented by Oliver Kopp 2
  • 3. Background Context: Web Services (WS‐*) Processes as orchestrations of Web Services (WS‐BPEL) Web Services Business Process Execution Language Concrete Setting: Networked interactions Communication faults Assumption: No runtime environment failures Components correctly implemented by themselves presented by Oliver Kopp 3
  • 5. Web Service Stack BPEL WS‐C, … Components Atomic Composite Quality  WS‐Reliable WS‐AT, WS‐Security of Service Messaging WS‐BA Description WSDL WS‐Policy Messaging SOAP WS‐Adressing JMS … “Binding” Transport HTTP SMTP RMI/IIOP JMS … Communication TCP/IP … Curbera, F. et al.: Web Services Platform Architecture: SOAP, WSDL, WS‐Policy, WS‐Addressing, WS‐BPEL,  presented by Oliver Kopp WS‐Reliable Messaging and More. Prentice Hall PTR (2005) 5
  • 6. Message Passing Through the Layers Components (BPEL) A Q I Quality of Service (WS‐Reliable Messaging) B P H J Messaging (SOAP) C O G K Transport (HTTP) D N F L Communication (TCP/IP) Sending E Receiving Application M Application presented by Oliver Kopp Default flow Exception flow 6
  • 7. Component Communication Layer Quality of Service Messaging All protocols and mechanisms of Transport OSI Layered Network Model Layers 1 to 6 Communication Examples of faults (TCP/IP) Connectivity faults (arc E) Data integrity faults (arcs E and M) Transport (HTTP) D L N F E Communication (TCP/IP) M Sending Receiving presented by Oliver Kopp Application Application 7
  • 8. Component Transport Layer Quality of Service Messaging OSI Layered Network Model layer 7 Transport Examples of faults (HTTP) Communication 4xx Client‐side faults 403 Forbidden 5xx Server‐side faults 503 Service Unavailable Messaging (SOAP) C K O G Transport (HTTP) D L N F Communication (TCP/IP) Sending Receiving presented by Oliver Kopp Application Application 8
  • 9. Component Messaging Layer Quality of Service Messaging SOAP processing Transport Examples for faults Communication MustUnderstand fault Sender fault Receiver fault Quality of Service (WS‐RM) B J P H Messaging (SOAP) C K O G Transport (HTTP) Sending Receiving presented by Oliver Kopp Application Application 9
  • 10. Component Quality of Service Layer Quality of Service Messaging Reliable Transfer of Messages Transport i.e., at least once semantics Communication Implemented by sequences of numbers If sequence is not acknowledged in time, a  SequenceTerminated fault is propagated Components (BPEL) A Q I Quality of Service (WS‐RM) B J P H Messaging (SOAP) Sending Receiving presented by Oliver Kopp Application Application 10
  • 11. Component Component Layer Quality of Service Messaging Faults: No communication faults Transport Faults described by component interface  Communication (WSDL) Sent back to the caller Faults occurring in the component implementation Specified ways for interface layer faults No specified ways to treat faults on lower layers Components (BPEL) A Q I Quality of Service (WS‐RM) Sending Receiving Application Application presented by Oliver Kopp 11
  • 12. Message Passing Through the Layers Components (BPEL) A Q I Quality of Service (WS‐Reliable Messaging) B P H J Messaging (SOAP) C O G K Transport (HTTP) D N F L Communication (TCP/IP) Sending E SOAP  Receiving Application M Intermediary Application presented by Oliver Kopp Default flow Exception flow 12
  • 14. Implementation Inspected Components (BPEL) ODE Quality of Service Sandesha (WS‐Reliable Messaging) Axis  Messaging (SOAP) Transport (HTTP) HTTP  Components Communication (TCP/IP) java.io Application presented by Oliver Kopp 14
  • 15. Apache ODE BpelRuntimeContext Key object to call required functionality invoke method SoapExternalService Axis2: OutInAxisOperationClient Java Exception: failure method of parent SOAP fault: completed method of parent presented by Oliver Kopp 15
  • 16. Axis 2 Architecture AxisFault MessageContext AbstractMessageReceiver OutInAxisOperationClient HTTPTransportReceiver SandeshaInHandler SandeshaOutHandler CommonsHTTPTransportSender presented by Oliver Kopp http://ws.apache.org/axis2/1_4_1/userguide.html 16
  • 18. Conclusions and Outlook Overview on the fault handling on all layers in the Web service Stack Overview on one implementation Coordinating distributed fault handling using BPEL BPEL‐based SOAP routing Scheibler, T.; Karastoyanova, D. & Leymann, F. Dynamic Message Routing Using Processes, KiVS 09, Springer, 2009 presented by Oliver Kopp 18