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In software engineering, inversion of control (IoC) is a design principle in which custom-written portions of a computer program receive the flow of control from an external source (e.g. a framework). The term "inversion" is historical: a software architecture with this design "inverts" control as compared to procedural programming.
Containers such as Ninject or StructureMap are commonly used in object-oriented programming languages to achieve Dependency Injection and inversion of control. Manual dependency injection is often tedious and error-prone for larger projects, promoting the use of frameworks which automate the process.
The solution may be simpler with service locator (vs. dependency injection) in applications with well-structured component/service design. In these cases, the disadvantages may actually be considered as an advantage (e.g., no need to supply various dependencies to every class and maintain dependency configurations).
Dependency injection is a pattern where the container passes objects [4]: 128 by name to other objects, via either constructors, [4]: 128 properties, or factory methods. There are several ways to implement dependency injection: constructor-based dependency injection, setter-based dependency injection and field-based dependency injection. [56]
In object-oriented design, the dependency inversion principle is a specific methodology for loosely coupled software modules.When following this principle, the conventional dependency relationships established from high-level, policy-setting modules to low-level, dependency modules are reversed, thus rendering high-level modules independent of the low-level module implementation details.
In software engineering, containerization is operating-system–level virtualization or application-level virtualization over multiple network resources so that software applications can run in isolated user spaces called containers in any cloud or non-cloud environment, regardless of type or vendor. [1]
The Loader is an ID'ed DIV container that identifies a partial update region for later content injection; The Content that contains both static information and interactive elements, also known as "Triggers"; Client-side Handlers that process various trigger events, such as button clicks;
The pattern language presented in the book consists of 65 patterns structured into 9 categories, which largely follow the flow of a message from one system to the next through channels, routing, and transformations.