Download Abstraction and Specification in Program Development (MIT by Barbara Liskov, John V. Guttag PDF

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By Barbara Liskov, John V. Guttag

Abstraction and Specification in software improvement bargains execs in application layout and software program engineering a technique that would permit them to build courses which are trustworthy and fairly effortless to appreciate, alter, and preserve. stable programming includes the systematic mastery of complexity, and this ebook offers the 1st unified therapy of the options of abstraction and specification, which, the authors argue, are the linchpin of any powerful method of programming. They position specific emphasis at the use of information abstraction to provide hugely modular courses. The authors specialise in the method of decomposing huge software tasks into self sustaining modules that may be assigned to self reliant operating teams. They talk about tools of decomposition, the types of modules which are most valuable during this approach, and methods to extend the chance that modules produced can actually be recombined to unravel the unique programming challenge. there are numerous examples of abstractions through the textual content, and every bankruptcy ends with pertinent references and routines. lots of the pattern implementations within the booklet are written in CLU, one among progressively more languages capable of help info abstraction. adequate fabric is incorporated, besides the fact that, to permit the reader to paintings in Pascal in addition. the cloth during this publication was once built through the authors in the course of a decade of training undergraduate, graduate, and professional-level classes. Barbara Liskov, the developer of CLU, is Professor and John Guttag an affiliate Professor of desktop technological know-how at MIT. Abstraction and Specification in software improvement is incorporated within the MIT electric Engineering and machine technology sequence.

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Extra resources for Abstraction and Specification in Program Development (MIT Electrical Engineering and Computer Science Series)

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CLOSING bufferedAmount Returns the total number of bytes that were queued when the send() method was called binaryType Returns the binary data format we received when the onmessage event was raised The complete example Here are the complete HTML and JavaScript files we used. We have omitted the stylesheet file in order to keep the main points simple. com/books/websockets/ source-code. js">

HTML5 WebSocket chat. close(); } } } What about the server? org server for this demo.

Close(1000, "Deliberate disconnection"); Properties The WebSocket object exposes some property values that let us understand its specific characteristics. We have already met the readyState property. CLOSING bufferedAmount Returns the total number of bytes that were queued when the send() method was called binaryType Returns the binary data format we received when the onmessage event was raised The complete example Here are the complete HTML and JavaScript files we used. We have omitted the stylesheet file in order to keep the main points simple.

They will be executed asynchronously when a specific action occurs. So, let's have a closer look at them. [ 19 ] The WebSocket API onopen The onopen event is raised right after the connection has been successfully established. "); // Initialize any resources here and display some user-friendly messages. "; } It's a good practice to provide your users with the appropriate feedback while they are waiting for the connection to open. WebSockets are definitely fast, but the Internet connection might be slow!

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