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(not) Threadsafe Events

published by Kuling on pon., 2012-04-23 15:03

http://www.codeproject.com/Articles/37474/Threadsafe-Events

Cytat:

"Callbacks" (usually events in C#) have always been problematic for multithreaded programming. This is because a good rule of thumb for component design is: Do your best to allow the event handler to do anything. Since "communicate with another thread that is attempting to take any lock" is one example of "anything", a natural corollary of this rule is: Never hold locks during callbacks.

Cytat:

A general-purpose solution does not exist, and all other solutions have serious drawbacks (placing severe restrictions on the actions available to the event handler).

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Programowanie

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Dependency injection

published by Kuling on pt., 2012-03-30 14:02

Cytat:

One benefit of using the dependency injection approach is the reduction of boilerplate code in the application objects since all work to initialize or set up dependencies is handled by a provider component.
Another benefit is that it offers configuration flexibility because alternative implementations of a given service can be used without recompiling code. This is useful in unit testing, as it is easy to inject a fake implementation of a service into the object being tested by changing the configuration file, or overriding component registrations at run-time.

Furthermore, dependency injection facilitates the writing of testable code.

http://en.wikipedia.org/wiki/Dependency_injection
http://en.wikipedia.org/wiki/Inversion_of_control
http://en.wikipedia.org/wiki/Dependency_inversion_principle

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Programowanie

Design Patterns: Elements of Reusable Object-Oriented Software

published by Kuling on pon., 2012-02-06 18:46

http://www.amazon.com/Design-Patterns-Elements-Reusable-Object-Oriented/dp/0201633612

W sumie taka sobie 3/5. Przegadana. Wystarczy przekartkować.

1. Introduction
What Is a Design Pattern? * Design Patterns in Smalltalk MVC * Describing Design Patterns * The Catalog of Design Patterns * Organizing the Catalog * How Design Patterns Solve Design Problems * How to Select a Design Pattern * How to Use a Design Pattern

2. A Case Study: Designing a Document Editor
Design Problems * Document Structure * Formatting * Embellishing the User Interface * Supporting Multiple Look-and-Feel Standards * Supporting Multiple Window Systems * User Operations * Spelling Che cking and Hyphenation * Summary

Design Pattern Catalog

3. Creational Patterns
Abstract Factory * Builder * Factory Method * Prototype * Singleton * Discussion of Creational Patterns

4. Structural Pattern
Adapter * Bridge * Composite * Decorator * Facade * Flyweight * Proxy * Discussion of Structural Patterns

5. Behavioral Patterns
Chain of Responsibility * Command * Interpreter * Iterator * Mediator * Memento * Observer * State * Strategy * Template Method * Visitor * Discussion of Behavioral Patterns

6. Conclusion
What to Expect from Design Patterns * A Brief History * The Pattern Community * An Invitation * A Parting Thought

Kategorie:

Programowanie