Types
Martin Fowler identifies three ways in which an object can get a reference to an external module, according to the pattern used to provide the dependency:
- Type 1 or interface injection, in which the exported module provides an interface that its users must implement in order to get the dependencies at runtime.
- Type 2 or setter injection, in which the dependent module exposes a setter method that the framework uses to inject the dependency.
- Type 3 or constructor injection, in which the dependencies are provided through the class constructor.
It is possible for other frameworks to have other types of injection, beyond those presented above.
Read more about this topic: Dependency Injection
Famous quotes containing the word types:
“The bourgeoisie loves so-called “positive” types and novels with happy endings since they lull one into thinking that it is fine to simultaneously acquire capital and maintain one’s innocence, to be a beast and still be happy.”
—Anton Pavlovich Chekhov (1860–1904)
“Our major universities are now stuck with an army of pedestrian, toadying careerists, Fifties types who wave around Sixties banners to conceal their record of ruthless, beaverlike tunneling to the top.”
—Camille Paglia (b. 1947)
“Science is intimately integrated with the whole social structure and cultural tradition. They mutually support one other—only in certain types of society can science flourish, and conversely without a continuous and healthy development and application of science such a society cannot function properly.”
—Talcott Parsons (1902–1979)