Client Server Systems

Algorithm = Logic + Control by Kowalski R.

By Kowalski R.

An set of rules might be considered as which includes a common sense part, which specifies the data for use in fixing difficulties, and a keep an eye on part, which determines the problem-solving recommendations through which that wisdom is used. The common sense part determines the that means of the set of rules while the keep watch over part in basic terms impacts its potency. The potency of an set of rules can frequently be greater by way of bettering the keep an eye on part with no altering the common sense of the set of rules. We argue that machine courses will be extra frequently right and extra simply enhanced and transformed if their good judgment and keep an eye on points have been pointed out and separated within the application textual content. key terms and words: keep watch over language. common sense programming, nonprocedural language, programming method, application specification, relational facts constructions

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We’ll explain this later in detail, but for now look at the Path Match input field. If you enter a partial URL in there, you can see a report erratum • discuss Chapter 2. Instant Gratification • 36 list of routes that match. That’s not needed right now, as we have only two routes, but can be helpful later when we have many. At this point, we’ve completed our toy application and in the process verified that our installation of Rails is functioning properly and provides helpful information when things go wrong.

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When we refresh our browser window, we see the time displayed using Ruby’s standard format, as shown in the following screenshot. Notice that the time displayed updates each time the browser window is refreshed. It looks as if we’re really generating dynamic content. Making Development Easier You might have noticed something about the development we’ve been doing so far. As we’ve been adding code to our application, we haven’t had to restart the running application. It’s been happily chugging away in the background.

This is great for development. However, this flexibility comes at a cost: it causes a short pause after you enter a URL before the application responds. That’s caused by the dispatcher reloading stuff. For development it’s a price worth paying, but in production it would be unacceptable. For this reason, this feature is disabled for production deployment. See Chapter 16, Task K: Deployment and Production, on page 243. report erratum • discuss Hello, Rails! • 29 Adding the Time Our original problem was to display the time to users of our application.

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