David Harel's Come, Let's Play: Scenario-Based Programming Using LSCs and PDF

By David Harel

ISBN-10: 3540007873

ISBN-13: 9783540007876

This ebook provides a strong new language and technique for programming complicated reactive platforms in a scenario-based demeanour. The language is stay series charts (LSCs), a multimodal extension of series charts and UML's series diagrams, utilized in the earlier often for requisites. The technique is play-in/play-out, an strangely handy potential for specifying inter-object scenario-based habit without delay from a GUI or an item version diagram, with the spectacular skill to execute that habit, or these specifications, at once. The language and technique are supported by way of a completely applied instrument – the Play-Engine – that is hooked up to the publication in CD shape. reviews from specialists within the box: The layout of reactive structures is likely one of the so much difficult difficulties in computing device technology. This books begins with a serious perception to provide an explanation for the trouble of this challenge: there's a basic hole among the scenario-based approach within which humans take into consideration such structures and the state-based manner within which those structures are applied. The publication then deals a thorough inspiration to bridge this hole by way of taking part in situations. platforms might be laid out in enjoying in eventualities and carried out through a Play-Engine that performs out situations. this concept is performed and constructed, lucidly, officially and playfully, to its fullest. the result's a compelling suggestion, followed by way of a prototype software program engine, for reactive structures layout, that's guaranteed to reason a touch within the software-engineering neighborhood. Moshe Y. Vardi, Rice collage, Houston, Texas, united states situations are a first-rate alternate software in explaining procedure habit to others, yet their constrained expressive energy by no means made them in a position to totally describe platforms, hence proscribing their use. The language of stay series Charts (LSCs) awarded during this fantastically written ebook achieves this aim, and the connected Play-Engine software program makes those LSCs fairly come alive. this is often certainly a key step forward that might commence long-awaited and fascinating new instructions in structures specification, synthesis, and research. Gérard Berry, Esterel applied sciences and INRIA, Sophia-Antipolis, France The process of David Harel and Rami Marelly is an engaging method of mixing prototyping thoughts with ideas for picking habit and person interfaces. Manfred Broy, Technical collage of Munich, Germany

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Extra resources for Come, Let's Play: Scenario-Based Programming Using LSCs and the Play-Engine

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In fact, for GUI-less systems, or for sets of internal objects, we simply use the object model diagram as a GUI. In any case, the user then ‘plays’ the incoming events on the GUI, by clicking buttons, rotating knobs and sending messages (calling functions) to hidden objects, in an intuitive drag & drop manner. ) By similarly playing the GUI, often using right-clicks, the user then describes the desired reactions of the system and the conditions that may or must hold. As this is being done, the Play-Engine does essentially two things continuously: it instructs the GUI to show its current status using the graphical features built into it, and it constructs the corresponding LSCs automatically.

24. Playing out internal objects When LSCs containing method calls are played out, the Play-Engine animates them by drawing arrows between the involved objects and highlighting them. Thus, the play-out mechanism can be used not only to help end-users validate requirements but also as a useful tool for demonstrating, reviewing and debugging a design. 24 shows how interaction between objects is animated in the Play-Engine. Note that the arrows are not limited to being internal to the GUI application or to the object map themselves, but can run from one to the other.

These are facts that, in general, no amount of execution can fully verify. Although general verification is a non-computable algorithmic problem, and for finite-state systems it is computationally intractable, the idea of rigorously verifying programs and systems — hardware and software — has come a long way since the pioneering work on inductive assertions in the late 1960s and the later work on temporal logic and model checking. These days we can safely say that true verification can be carried out in many, many cases, even in the slippery and complex realm of reactive real-time systems.

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Come, Let's Play: Scenario-Based Programming Using LSCs and the Play-Engine by David Harel


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