inversion of control: spring.net overview
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10 May, 2009 Inversion Of Control - Spring.NET Overview
Inversion Of Control - Spring.NET Overview2
Dependencies and Dependency Injection
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What is Dependency Injection?
Dependency injection (DI) in programming refers to the process of supplying an external dependency to a software component.
It is a specific form of inversion of control where the concern being inverted is the process of obtaining the needed dependency.
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But … what is Inversion of control?
Inversion of control, or IoC, is an abstract principle describing an aspect of some software architecture designs in which the flow of control of a system is inverted in comparison to the traditional architecture.
Control flow is expressed in imperative programming in the form of a series of instructions or procedure calls. Instead of specifying a sequence of decisions and procedures to occur during the lifetime of a process, the user of a IoC framework writes the desired responses linked to particular events or data requests.
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IOC Container
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Aha…and what is an IOC container?
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Spring.NET
an application framework for buidling Enterprise .NET applications
an IoC Container (Inversion of Control) that manages and injects dependencies on behalf of developers (DI = Dependency Injection)
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And more…
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IoC Containers for .NET
PicoContainer.NET: lightweight and highly embeddable IoC container
StructureMap: lightweight Inversion of Control (IoC) Container written in C#; can improve the architectural qualities of .NET apps by reducing the mechanical costs of good design techniques
Castle: Tools for application development including small IoC container
Spring.NET: full featured IoC container (port of Java version)
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Practice First approach - Dependencies
public class ExampleObject {
private AnotherObject objectOne; // dependencies
private YetAnotherObject objectTwo;
private int i;
public AnotherObject ObjectOne {
set { this.objectOne = value; }
}
public YetAnotherObject ObjectTwo {
set { this.objectTwo = value; }
}
public int IntegerProperty {
set { this.i = value; }
}
}
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Configuration I
Preferred way to create Object Factories and Application contexts is via configuration:<configuration> <configSections> <sectionGroup name="spring"> <section name="context" type="Spring.Context.Support.ContextHandler, Spring.Core"/> <section name="objects" type="Spring.Context.Support.DefaultSectionHandler, Spring.Core" /> </sectionGroup> </configSections> <spring> <context> <resource uri="config://spring/objects"/> </context> <objects> ... </objects> </spring></configuration>
Handlers used for Spring configuration section
Where to find object configuration, e.g. file, assembly, config
Configuration of Spring managed objects
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Configuration II
The configuration tells Spring.NET how objects depend on each other:
<object id="exampleObject" type="Examples.ExampleObject, ExamplesLibrary">
<property name="objectOne" ref="anotherExampleObject"/>
<property name="objectTwo" ref="yetAnotherObject"/>
<property name="IntegerProperty" value="1"/>
</object>
<object id="anotherExampleObject" type="Examples.AnotherObject, ExamplesLibrary"/>
<object id="yetAnotherObject" type="Examples.YetAnotherObject, ExamplesLibrary"/>
Object name Object type: namespace path + class, assembly
Properties referring to other objects: often called dependencies or collaborators
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Usage
Now instantiating an ApplicationContext is simple:
IApplicationContext ctx = ContextRegistry.GetContext();ExampleObject person = (ExampleObject)ctx.GetObject(“exampleObject ");
ID that should appear in object
configuration
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Example application
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Solve the dependencies with Spring.NET IOC
Demo
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http://en.wikipedia.org/wiki/Inversion_of_control http://martinfowler.com/articles/injection.html http://abdullin.com/wiki/inversion-of-control-ioc.html http://www.springframework.net/doc-latest/reference/html/objects.html http://www.developer.com/net/csharp/article.php/3722931/Dependency-Inje
ction-with-SpringNet.htm
Resources
17 Inversion Of Control - Spring.NET Overview
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