Crash Only Web Services

Crash-Only Web Services: Failure Semantics in an SOA Environment www.oasis-open.org Chris Hobbs and Abbie Barbir Nortel OASIS Symposium 2007, San Diego

The crash-only model ,[object Object],[object Object],George Candea and Armando Fox are key proponents of crash-only software

Two themes of this talk ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Background: Orchestration as a New Programming Paradigm ,[object Object],[object Object],[object Object],[object Object],[object Object]

Testing Composed Services ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Testing Composed Services (2) ,[object Object],[object Object],[object Object],[object Object]

Web Services SLA (WSLA) ,[object Object],[object Object],[object Object],Service Provider Z Provider X Service X Provider Y Service Y Client WSLA Network Packets Message flows Web Service

How can WSLAs be derived from behaviors of component services? ,[object Object],[object Object]

Web Services behaviors ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Web Services behaviors (2) ,[object Object],[object Object],Z X Y

Web Services behaviors (3) ,[object Object],[object Object],[object Object],[object Object],[object Object]

Web Services behaviors (4) ,[object Object],Local Ontology Local Ontology Local Ontology Abstracted Ontology Abstracted Ontology X Y Z Z – Specific Ontology ? Need this analysis for each behavior of services X, Y and Z

Web Services behaviors (5) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Source: “Advertising Service Properties,” unpublished paper by C. Hobbs, J. Bell, P. Sanchez

Availability and Reliability ,[object Object],[object Object],[object Object],[object Object]

Availability and Reliability (2) ,[object Object],[object Object],[object Object]

Availability and Reliability (3) ,[object Object],[object Object],[object Object]

Availability and Reliability (4) ,[object Object],[object Object],[object Object],[object Object]

Availability and Reliability (5) ,[object Object],[object Object],[object Object],[object Object],[object Object]

Availability and Reliability (6) ,[object Object],[object Object]

Failure ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Failure (2) ,[object Object],[object Object],[object Object],[object Object]

Scalability ,[object Object],[object Object],[object Object],[object Object],[object Object]

Web Services behaviors (again) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Web Service Level Agreement (WSLA) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Web Service Level Agreements (2) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Web Service Level Agreements – conclusions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Back to the crash-only software model ,[object Object]

Crash-only software (1) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Crash-only software (2) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Crash-only software (3) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Crash-Only Software (4) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Crash-Only Web Services ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Crash-Only Reliable Web Service ,[object Object],[object Object],Crash-Only Application Server Stall Proxy Web Service Consumer Web Services Endpoint Recovery Agent Crash-Only Backend Crash-Only Backend Crash-only WSM Internet Reliable SOAP Protocol WS-ReliableMessaging

Conclusions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Crash Only Web Services

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