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Fowler has written nine books on the topic of software development. He is a member of the Agile Alliance and helped create the Manifesto for Agile Software Development in 2001, along with 16 fellow signatories. [7] He maintains a bliki, a mix of blog and wiki. He popularised the term Dependency Injection as a form of Inversion of Control. [8] [9]
In software engineering, dependency injection is a programming technique in which an object or function receives other objects or functions that it requires, as opposed to creating them internally. Dependency injection aims to separate the concerns of constructing objects and using them, leading to loosely coupled programs.
(Dependency injection is an example of the separate, specific idea of "inverting control over the implementations of dependencies" popularised by Java frameworks.) [4] Inversion of control is sometimes referred to as the "Hollywood Principle: Don't call us, we'll call you".
The registry hides the class' dependencies, causing run-time errors instead of compile-time errors when dependencies are missing (unlike when using constructor injection). The registry makes code harder to test, since all tests need to interact with the same global service locator class to set the fake dependencies of a class under test.
Dependency Injection pattern: a class accepts the objects it requires from an injector instead of creating the objects directly; Lazy initialization pattern: tactic of delaying the creation of an object, the calculation of a value, or some other expensive process until the first time it is needed
Specifications by Eric Evans and Martin Fowler; The Specification Pattern: A Primer by Matt Berther; The Specification Pattern: A Four Part Introduction using VB.Net by Richard Dalton; The Specification Pattern in PHP by Moshe Brevda; Happyr Doctrine Specification in PHP by Happyr; The Specification Pattern in Swift by Simon Strandgaard
Martin Fowler's original bliki entry coining the term; A Delphi example of writing XML with a fluent interface; A .NET fluent validation library written in C# Archived 2017-12-23 at the Wayback Machine; A tutorial for creating formal Java fluent APIs from a BNF notation; Fluent Interfaces are Evil; Developing a fluent api is so cool
Plain Old CLR Object is a play on the term plain old Java object from the Java EE programming world, which was coined by Martin Fowler in 2000. [2] POCO is often expanded to plain old C# object, though POCOs can be created with any language targeting the CLR. An alternative acronym sometimes used is plain old .NET object. [3]