Advertisement
Поиск  
Always will be ready notify the world about expectations as easy as possible: job change page
Oct 21, 2023

Input Kludge

Источник:
Просмотров:
555

AntiPattern Problem

Software that fails straightforward behavioral tests may be an example of an Input Kludge, which occurs when ad hoc algorithms are employed for handling program input.

For example, if the program accepts free text input from the user, an ad hoc algorithm will mishandle many combinations of legal and illegal input strings. The anecdotal evidence for an Input Kludge goes like this: "End users can break new programs within moments of touching the keyboard."

Input

Refactored Solution

For nondemonstration software, use production-quality input algorithms. For example, lexical analysis and parsing software is readily available as freeware. Programs such as lex and yacc enable robust handling of text comprised of regular expressions and context-free language grammars. Employing these technologies for production-quality software is recommended to ensure proper handling of unexpected inputs.

Variation

Many software defects arise due to unexpected combinations of user-accesible features. Employing a feature matrix is recommended for sophisticated applications with graphical user interfaces.

A feature matrix is state information in the program used to enable and disable features prior to user actions. When the user invokes a feature, the feature matrix indicates which other features must be disabled in order to avoid conflicts. For example, a feature matrix is often used to highlight and unhighlight menu commands prior to displaying the menu.

Background

Programmers are trained to avoid input combinations that cause program and system crashes. In a hands-on training course on OpenDoc, we used a preliminary alpha release of the technology that was not yet sufficiently robust for production-quality development. In other words, it was easy to crash the entire operating system with seemingly correct sequences of input commands and mouse operations.

The students spent the first day experiencing numerous system crashes and waiting for system reboot. After attending the "crashing labs," we wondered whether the release was robust enough to enable any kind of sophisticated software development. By the end of the week, we had learned to work around the limitations and perform programming tasks and input operations that went well beyond our expectations formed the first day. We had internalized the input sequences that avoided system crashes.

Похожее
Oct 25, 2023
Author: Ignacio Chiazzo
As a developer, which areas should we focus on for performance optimizations? How can we measure the impact? Read this post to learn the framework.Performance optimization is any software or hardware modifications that make the platform faster and more scalable,...
Oct 21, 2023
BackgroundIn a data-mining expedition, we began looking for insight into developing a standard interface for a particular kind of system. The system we were mining was very similar to those we hoped would eventually support the standard we were working...
Jan 18
Author: Albert Llousas
Are you wondering if there is life beyond the conventional layered, clean or hexagonal code architectures? It turns out there is an old concept known as Functional Core, Imperative Shell (FCIS). Let’s take a closer look and see how it...
Oct 21, 2023
BackgroundCut-and-Paste Programming is a very common, but degenerate form of software reuse which creates maintenance nightmares. It comes from the notion that it's easier to modify existing software than program from scratch. This is usually true and represents good software...
Написать сообщение
Почта
Имя
*Сообщение


© 1999–2024 WebDynamics
1980–... Sergey Drozdov
Area of interests: .NET Framework | .NET Core | C# | ASP.NET | Windows Forms | WPF | HTML5 | CSS3 | jQuery | AJAX | Angular | React | MS SQL Server | Transact-SQL | ADO.NET | Entity Framework | IIS | OOP | OOA | OOD | WCF | WPF | MSMQ | MVC | MVP | MVVM | Design Patterns | Enterprise Architecture | Scrum | Kanban