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Component design and implementation tools


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Component design and implementation tools

  1. 1. BYKalaivani.V B.Tech IT
  2. 2. Component design rests on the environmental specifications – usuallygiven by a component framework and an underlying component (or object)model.Ideally, component development should use rapid application development(RAD) methods to capture requirements quickly within a workingcomponent system.The same environment is used to prototype a component, within acharacteristic environment, and implement the component.
  3. 3. Support for the construction of models (typically in UML) and supportingfurther metadata can help guide the component construction process. At a minimum, such models help in documenting an effort. In practically relevant cases such as components representing relatively straightforward businessconcepts in the presence of evolved application servers components can actually be generated from their models with little further input from developers.Where this approach succeeds, modeling and generator tools can take themarketing position of RAD tools.
  4. 4. Component testing toolsTesting of components is possibly the single most demanding aspect ofcomponent technology.By definition, components can only be tested in a few, hopefully representative,configurations.Systematic approaches to testing of components are needed, and intense toolsupport for this purpose is likely to be required.
  5. 5. Faced with the extreme difficulties of component testing, two strategiesseem advisable.The first strategy is to avoid errors statically wherever possible.The second strategy is to make sure that components are deployed in such away that faults leave logged traces.In this way, a failure in a production component system can at least betraced.
  6. 6. Component assembly toolsComponents are assembled by instantiating and connecting component instancesand customizing component resources.While component instances at runtime may or may not correspond to visualentities, it is useful to assume that all component instances have a visualrepresentation at assembly-time. It is then possible to use powerful document-centric builder tools to assemblecomponents, even if the runtime environment is a server or batch one.JavaBeans is a component standard that explicitly distinguishes between assemblytime and runtime and that allows component instances to look and behave differentlyduring assembly-time and runtime.
  7. 7. An important aspect often overlooked by current “builder tools” is thatassembly itself needs to be automated.Software assembly is different from hardware assembly in that it is notnecessary to assemble individual instances repeatedly –  the entire assembled product can instead be cloned. However, a different aspect of assembly processes also still holds for software assembly. If future versions of components become available, then it is important thatthe assembly process can be repeated –  only modified where necessary to live with or take advantage of the new component versions.
  8. 8. Reference:- Clemens Szyperski, “Components Software: Beyond Object-Oriented Programming”
  9. 9. THANK YOU