Design Tools Software Engineering
Design Tools Software Engineering
Design Patterns for Software Engineering
Introduction
Design patterns are a relatively new concept in software engineering, and have their origins in civil engineering. Essentially, they are a model for solving a specific problem, allowing the benefits of an optimal solution to be postponed to new locations.
The application of design patterns in software engineering was first formalized in the book "Design Patterns: Elements of Reusable Object-Oriented Software" by Eric Gamma, Richard Helm, Ralph Johnson and John Vlissides in 1995. The book was selected 23 models considered fundamental to the understanding of the model approach to solve the problems of software engineering.
Well that the book also set out principles many it is not a general model for the job profile available to the wider public. Subsequently implementation models did not become an exercise in model motor. The engineers are free to choose how best to use models in different applications.
Structure of Design Patterns
What is clear is that there needs to be in the structure which models can be formulated, which allows for them to be largely self-documenting. Indeed, one of the principles of the use design patterns is that they must be structured, allowing everyone to be created from a template.
At the very least, a model must contain:
• Pattern Name: short, but descriptive;
• Intent: The purpose of the structure;
• Motivation: an example of a problem, and how this trend will solve it;
• Applicability: Use this ground;
• Structure: diagrams of class models;
• Participants: the responsibilities of classes in the model;
• Collaborations: interfaces between the participants;
• Consequences: all the compromises and the forces that exist within the model.
This list is adapted from that provided by the authors Design Patterns, and can be used as rigid or looser than necessary. Some aspects will prove do not add any useful value for the model, but are provided here in the interest of completeness.
We have also waived to use the term "classes and objects" is more common in discussions of design patterns, preferring to use only the term "classes". The reason is one of the objects of preference oriented design – if a model must be defined in terms of objects, then a decision to implement have been made and imposed future adopters of the specific configuration.
Application of Design Patterns in software engineering
One of the main advantages use design patterns in software engineering is also a way to improve communication between designers and, to some extent, between non-programmers and programmers. In other words, as a communication tool, the models can be valuable.
Furthermore, ignoring solutions problems of software engineering, design patterns can be used again and again. Since they use a proven solution Each time, the reuse level design is very high. This improves the quality of the resulting implementations beyond what would be feasible using only object-oriented techniques.
The application of design patterns in the real world must necessarily be made compared to other principles already deployed. In other words, while they offer solutions to problems of software engineering, there is no value in creating models for each part of a system under development.
Instead, they must be used in cases where the implementation resulting (or design) may be used in future projects. Essentially the best way to use design patterns in software engineering is providing standard behavior between classes in the highly specialized a software system. The are not a design technique in itself, in the way of other paradigms.
Summary
The reason for using design patterns are essentially parallel to those of any object-oriented techniques using. Design models to encourage reuse, implementations without forcing a specific platform or language, and promote the effective use of design time. They can be considered as equivalent to the modular or object oriented programming.
Their strengths, however, can also be regarded as their weakness. By not being implementations, the programmer is still needed to actually code, and as such errors in interpretation will be translated in the last source code. This means that different programmers may end up with different implementations of the same model, perhaps even with different behaviors.
When you work with design templates, it is important to remember that they must be specific enough that there is no contradiction possible. Using appropriate language in high definition level that can be shown that correct help ensure this.
About the Author
Sally Lopez is a software developer specializing in software and web application development. To find out more about Offshore IT Outsourcing visit www.cosource.com.au.
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