Extensibility in application

Extensibility in Applicationusing MEF
By Abhishek Sur
Website: www.abhisheksur.com
Email : contact@abhisheksur.com
Twitter : @abhi2434

Agenda

What is Extensibility

Extensiblity
Extensibility is an ability to design an application in such a manner so that 3rd party vendor can come along and customize it.
Extensibility does not require the application to be redeployed.
Extensible applications are flexible on client needs.
Examples : Microsoft Office, Skype, World Warcraft etc.

Bertrand Meyer’s Open Close Principle

Benefits of Extensible application
Reusability
Modularizing
Loose Coupling
Greater Momentum
Support for 3rd party vendors
Feeling of Ownership

Problems of Extensible application
Development process is more complex.
Architecture should be thought before actual development begins.
Security
More error prone

Demo
Extensibility in your Application

Managed Extensibility Framework

How to MEF

Export

Import

Compose

MEF Architecture
Catalog
CustomExportProvider
CatalogExportProvider
AggregatingExportProvider
CompositionContainer
Part
Part
Part
Export
Import
Export
Import
Export
Import

MEF
Catalog
Discovers and maintain extensions
CompositionContainer
Coordinate creations and satisfy dependencies
ComposablePart
Are Imports and Exports that are composable to the Container
Support for LAZY
Support for Dynamic Recomposition

Demo
Adding MEF to the application

Finally
Visual Studio is rich with MEF components
They export functionality that your code might need.
They import functionality that your code might offer.
Your extension can export:
IWPFTextViewMarginProvider
ITaggerProvider
IMouseProcessorProvider
ICompletionSourceProvider
There are lots more…….

References
MEF Article
http://tinyurl.com/MEFWORLD
MEF Source
http://tinyurl.com/MEFSOURCE
MEF Guide
http://tinyurl.com/mefguide
MEF Blogs
http://tinyurl.com/mefBlogs
MEF Discussions
http://tinyurl.com/mefDiscussions

Abhishek Sur, MVP (Client App Dev)
www.abhisheksur.com
Email: contact@abhisheksur.com
Twitter : @abhi2434
Thank you.

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Extensibility in application

by Abhishek Sur on Aug 27, 2011

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Extensibility in application — Presentation Transcript