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Web Services Context WS-CTX http://developers.sun.com/techtopics/webservices/wscaf/wsctx.pdf

Web Services Context WS-CTX http://developers.sun.com/techtopics/webservices/wscaf/wsctx.pdf. Presented by: Ioan Toma. Overview. Introduction Architecture Components Activities WS-CTX interactions Conclusions. Introduction.

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Web Services Context WS-CTX http://developers.sun.com/techtopics/webservices/wscaf/wsctx.pdf

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  1. Web Services Context WS-CTXhttp://developers.sun.com/techtopics/webservices/wscaf/wsctx.pdf Presented by: Ioan Toma

  2. Overview • Introduction • Architecture • Components • Activities • WS-CTX interactions • Conclusions

  3. Introduction • WS-CTX allows multiple Web services to share a common context structure

  4. Architecture • WS-CTX represents a Web services interaction of a number of activities related to an overall application • Defines demarcation points between activates • Register Web services • Propagate context information • WS-CTX components: • Context Service • Context • Activity Lifecycle Service

  5. WS-CTX components Context Service • defines the scope of an activity and how information about it (the context) can be referenced and propagated in a distributed environment. • is concerned with managing the lifecycle of context propagation. Activity Lifecycle Service • offer additional information to the basic context • registered with the Context service and are informed of the lifetime of an activity

  6. WS-CTX components (cont) Context • contains information necessary for multiple Web services to be associated with the same activity. • is modeled as a Web resource and is accessible via a URI • consists of the following items: • A URI identifier - context identifier • Activity-service element – Context service identifier • Type of the activity identifier • List of the services currently participating in the activity • List of child activities • Timeout value • transported in a SOAP header block

  7. WS-CTX Activity • is a unit of (distributed) work, involving one or more parties (services, components, objects); a way of scoping application specific work • has a status: active, completing, completed, no_activity, unknown • has a completion status: success, fail, fail_only, unknown • has a outcome that is returned to the initial Web service application

  8. WS-CTX Activity (Cont) • Services involved within an activity: • Activity Lifecycle Service • Application Service

  9. WS-CTX interactions • Enlisting and delisting an Activity Lifecycle Service by using two interfaces • ALSRegistrar (Context Service) • enlistALS, delistALS • ALSRegistrant (ALS) • enlisted, delisted, invalidALSFault, generalFalut

  10. WS-CTX interactions (cont) • Interactions between ALS and Context Service • ALS (ALS endpoint) • begin, completeWithStatus, complete, getIdentity • ALSRespondant (Context Service endpoint) • begun, completedWithStatus, completed, identity, invalidALSFalut, validContextExpectedFault, generalFalut • Interaction between Context Service and Users services • CTXService • begin, complete, completeWithStatus, setCompletionStatus, getCompletionStatus, getStatus, getActivityName, getContext, setTimeout and getTimeout • UserCTXService • begun, completed, completionStatusSet, completionStatus, status, activityName, context, timeoutSet, timeout, invalidStateFault, invalidActivityFault, timeoutOutOfRangeFault, childActivityPendingFault, noActivityFault, noPermissionFault, validContextExpectedFault

  11. Conclusions • WS-CTX is intended as a lightweight mechanism for allowing multiple Web services to share a common context. • WS-CTX defines the context, the scope of context sharing, and basic rules for context management.

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