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:
“He’s one of those know-it-all types that, if you flatter the wig off him, he chatter like a goony bird at mating time.”
—Michael Blankfort. Lewis Milestone. Johnson (Reginald Gardner)
“If there is nothing new on the earth, still the traveler always has a resource in the skies. They are constantly turning a new page to view. The wind sets the types on this blue ground, and the inquiring may always read a new truth there.”
—Henry David Thoreau (1817–1862)
“The American man is a very simple and cheap mechanism. The American woman I find a complicated and expensive one. Contrasts of feminine types are possible. I am not absolutely sure that there is more than one American man.”
—Henry Brooks Adams (1838–1918)