The Large Synoptic Survey Telescope (LSST) Telescope and Site software team has adapted a previously described component template (SysML/UML model and code) to accommodate the project’s selected middleware (Service Abstraction Layer using the Data Distribution Service), message classification scheme, top-level state machine, operating system, command response paradigm, and extended settings requirements. The extended implementation easily accommodates extension for the use of any publish-subscribe protocol and isolates this behavior to make it easier to use. The revised component template remains a complete working application that developers extend in a precise manner to add application-specific behaviors. We report on the progress made designing and developing system components using the template and its application in the project workflow.
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