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Added a sentence defining the benefit or using DI over the singleton pattern

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Corey McMahon
2013-01-14 15:28:25 +11:00
parent 7850ebd5e4
commit 8d5ab66099
1 changed files with 3 additions and 2 deletions
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pages/Design-Patterns.md
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@@ -101,8 +101,9 @@ request lifecycle in a web application. This typically occurs when we have globa
class) or a shared resource (such as an event queue).
You should be wary when using the singleton pattern, as by its very nature it introduces global state into your
application, reducing testability. In most cases, dependency injection can (and should) be used in place of
singleton objects.
application, reducing testability. In most cases, dependency injection can (and should) be used in place of a
singleton class. Using dependency injection means that we do not introduce unnecessary coupling into the design of our
application, as the object using the shared or global resource requires no knowledge of a concretely defined class.
* [Singleton pattern on Wikipedia](https://en.wikipedia.org/wiki/Singleton_pattern)