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Managed Extensibility Framework or Effective Development of Scalable Applications with .NET Framework
 

Managed Extensibility Framework or Effective Development of Scalable Applications with .NET Framework

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by Volodymyr Voytyshyn

by Volodymyr Voytyshyn

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    Managed Extensibility Framework or Effective Development of Scalable Applications with .NET Framework Managed Extensibility Framework or Effective Development of Scalable Applications with .NET Framework Presentation Transcript

    • Managed Extensibility FrameworkEffective Development of Scalable Applications with .NET Volodymyr Voytyshyn 03/17/2012
    • Agenda What is MEF? Key concepts and features How to implement …? What’s new in MEF 2.0?
    • WHAT IS MEF?
    • The Problem No unified approach for extension application in runtime
    • The Solution MEF – Managed Extensibility Framework  Simply  Reliably  Unified
    • MEF Project Official Site http://mef.codeplex.com Developer Microsoft Started 26.08.2008 License MS Public License (open source) Last stable release MEF 1 / 12.04.2010 (included into .NET 4.0)
    • MEF focuses on… Extending of ready-made applications by plugins Application Plugin 1 Plugin 2
    • How about reflection? System.Reflection.* Assembly.Load() …
    • As a result… The next unique solution Not reusable components Extending by 3rd parties plugins
    • KEY CONCEPTS AND FEATURES
    • Composable Part Export Part Import
    • More Composable Parts Import Import Export Export
    • The Main Idea - Composition
    • Composition Container Composition Container Compose parts  Creates parts  Dispose parts
    • The Part Typed Contract
    • The Part Named Contract
    • The Part Extension Point Extension Point
    • Composition of Parts Composition of parts
    • Don’t forget… Add referenceSystem.ComponentModel.Composition.dll Using namespaces System.ComponentModel.Composition.*
    • More About Import
    • Export Metadata Key Value
    • Getting Exports Contract Returns Lazy
    • Creation Policy  Shared Default  NonShared value  Any  Any & Any == Shared  Shared == Singleton
    • References to Parts Container keeps reference to part if: – Part is marked as Shared – Part implements IDisposable – One or more imports allow Recomposition
    • Disposing Composition Container Dispose parts which implement IDisposable Reference to parts will be cleaned up Lazy exports won’t work
    • Catalog Composition Container Compose parts Discover parts Catalog
    • Catalog Types Assembly Catalog Directory Catalog Type Catalog Aggregate Catalog Deployment Catalog (only for Silverlight)
    • Recomposition Support Assembly Catalog Directory Catalog Refresh() Type Catalog Aggregate Catalog auto Deployment Catalog auto
    • HOW TO IMPLEMENT… ?
    • MEF-based Dependency Injection Service Locator TPart Resolve<TPart>() void Release<TPart>(TPart part) Common Service Locator Composition Container MEF Adapter
    • MEF vs IoC+ Ease of programming+ Resolves dependencies between components+ Automatic component discovery+ Can compose types, fields, props and methods- Slower than IoC containers- Poor component lifetime management- No component separation (separate appdomain, process)
    • Plugin-based Desktop Application Most Useful Tool Composition Container Plugins Folder Directory Catalog Refresh() Track File System Watcher changes
    • Plugin-based Desktop Application Allow parts recomposition Assemblies shadow copy! Plugin assembly can not be unloaded in runtime
    • Plugin-based ASP.NET MVC Application ASP.NET MVC Application Models Views Plugins Models Views
    • Plugin-based ASP.NET MVC ApplicationIntegrate MEF into ControllerFactoryMEF-based DependencyResolver? Compile razor view to separate assembly
    • WHAT’S NEW IN MEF 2.0?
    • MEF 2.0 and .NET 4.5
    • Open Generic Parts Any type
    • Convention-based Part Registration
    • Composition Scoping Enhancements Once Global Scope Logger Composition Container Request Scope Customer Controller For each request Customer Repository
    • Composition Provider for ASP.NET MVC Registering in composition container: – Controllers – Action filters – Model binders Constructor injection for controllers
    • ASP.NET MVC: processing of parts Naming convention Contract identification
    • Composition Provider for ASP.NET MVC Composition scopes – Request scope – Application scope
    • MEF Offers… Easy way for:  Composition independent components  Extending without recompiling  Delivering 3rd party plugins
    • Ask your question…
    • Useful Sources MEF Project (official site) Managed Extensibility Framework Overview (msdn) Building Composable Apps in .NET 4 with MEF (msdn) BCL Team Blog (msdn) Book of MEF (habrahabr)
    • Contacts Volodymyr Voytyshyn 5 Knyahyni Olhy Str., Rivne 33000, Ukraine Tel: +38(066) 41 83 509 E-mail: vvoit@softserveinc.com voytyshyn@gmail.com Skype: voytyshin Thank You!Copyright © 2011 SoftServe, Inc.