layout | title | folder | permalink | pumlid | categories | tags | ||
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pattern |
Dependency Injection |
dependency-injection |
/patterns/dependency-injection/ |
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Behavioral |
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Dependency Injection is a software design pattern in which one or more dependencies (or services) are injected, or passed by reference, into a dependent object (or client) and are made part of the client's state. The pattern separates the creation of a client's dependencies from its own behavior, which allows program designs to be loosely coupled and to follow the inversion of control and single responsibility principles.
Use the Dependency Injection pattern when
- when you need to remove knowledge of concrete implementation from object
- to enable unit testing of classes in isolation using mock objects or stubs