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Harmful Impact of Components and Web Services on Quality of Service

This article discusses the negative effects that components and web services can have on the quality of service in handcrafted TP systems. It emphasizes the importance of optimizing non-functional attributes such as performance, capacity, availability, durability, recoverability, and maintainability. The article also highlights the value of reusable components and web services and suggests expanding the definition of these to include non-functional attributes in WSDL. This information is useful for application architects, designers, optimizers, and component suppliers.

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Harmful Impact of Components and Web Services on Quality of Service

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  1. Components and Web Services Considered Harmful Inhibit Quality of Service Bob VavraUnisys

  2. What do we do in handcrafted TP systems that isn’t available commercially? • Optimization of a deployed TP system • Optimize the non-functional attributes • Performance, capacity, availability, durability, recoverability, maintainability, … • Continuing optimization by dedicated team • Separate from development projects

  3. Reusable Components and Web Services • Have visible well-defined functional characteristics • Interface definition, transaction semantics, and security • Have hidden implementations • Hidden non-functional attributes

  4. Non-functional attributes are important

  5. Expand Definitions of Component and Web Services • WSDL should include non-functional attributes of the implementation • Useful to application architects, designers, and optimizers • Useful to component suppliers • Reinforces the notion that implementation quality does matter • Some research underway on QoS for components, e.g., in the real-time community

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