Managed Extensibility Framework - PowerPoint Presentation

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Managed Extensibility Framework

Bart J.F. De

Smet

bartde@microsoft.com

http://blogs.bartdesmet.net/bart

Software Development Engineer

Microsoft Corporation

Session Code: DTL315Slide3

AgendaWhy extensibility mattersExtensibility the naïve way

MEF versus

System.Addin

Core concepts

Lots of demos

SummarySlide4

Extensibility in pictures

Source:

http://www.gambiastart.nlSlide5

Customer versus developer

Source:

http://www.insidefurniture.com

Source:

http://

cristinalaird.files.wordpress.comSlide6

Extensibility is hard

Looks familiar?

Too hard?Slide7

Take a step backinterface

IMathBinOp

{

string

Name {

get; }

int

Calculate(

int a, int

b);

}

IMathBinOp

GetOperation(

string

path,

string type){ Assembly asm = Assembly.LoadFrom(path); return (IMathBinOp)Activator.CreateInstance( asm.Name, type );}

Contract

Dynamic load

Name the 10 problems…Slide8

Extensibility the naïve wayBart J.F. De SmetSoftware Development Engineer

Microsoft Corporation

demoSlide9

AgendaWhy extensibility mattersExtensibility the naïve wayMEF versus

System.Addin

Core

concepts

Lots of demos

SummarySlide10

Managed Extensibility FrameworkParts

have a

contract

are found in a

catalog

compose in a

container

Square with 4 pins

I have these blocks

Let’s build somethingSlide11

System.Addin in a nutshell

Cross-process or

appdomain

Versioning adaptation

The essence of an add-inSlide12

Is System.Addin overkill?System.Addin

Isolation boundaries

Activation of add-ins

Across CLR versions

MEF

Composition engine

at its coreUtilities for discoverySimple declarative modelAnswer: complimentary technologiesSlide13

AgendaWhy extensibility mattersExtensibility the naïve wayMEF versus System.Addin

Core concepts

Lots of demos

SummarySlide14

A world of give and take

“I

need

”

“I

have

”Slide15

Composition

Host application

Need a

IMathBinOp

Extension A

Have a

IMathBinOp

MEF composition engine

[Export]

[Import]

Part

PartSlide16

Import and Export in practiceinterface

IMathBinOp

{

string

Name {

get; }

int

Calculate(

int a, int

b);

}

class

Calculator{ [Import]

public

IMathBinOp Operator { get; set; }}[Export(typeof(IMathBinOp))]class Add : IMathBinOp{ // Implementation}

Contract

Import

Export

Host application

ExtensionSlide17

How to compose?CompositionContainer

Wiring “surface” where magic happens

CompositionBatch

Contains the parts to be wired together

Container

Batch

Part

ComposeSlide18

Import and Export in practiceclass App

{

static

void

Main() {

var

calc

= new Calculator();

using

(

var

container = new CompositionContainer())

{

var batch = new CompositionBatch(); batch.AddPart(calc); batch.AddPart(new Add()); container.Compose(batch); } var res = calc.Operator.Calculate(1,2);

}}Manual

compositionSlide19

Simple compositionBart J.F. De SmetSoftware Development Engineer

Microsoft Corporation

demoSlide20

Advanced topics in import/exportNamed contractsTypically based on TypeCan also be string-based

ImportMany

For use with collections

E.g. calculator has many operations

Instantiation control

Which constructor to run?

Part creation policies (sharing of instances)Slide21

Where do parts come from?Concept of a catalogType catalog – explicit list of typesAssembly catalog –

attributed

types in an assembly

Directory

catalog – based on directory

search

Aggregate catalog – allows combining catalogsUnion operationComposablePartCatalog base classQueryable

for parts (

Parts

)

Search exports for a given import (

GetExports)Slide22

Using a DirectoryCatalogclass

App

{

static

void Main()

{

var

calc = new Calculator();

var

catalog =

new

DirectoryCatalog(EXTPATH); using

(

var

container = new CompositionContainer(catalog)) { var batch = new CompositionBatch(); batch.AddPart(calc); container.Compose(batch); } var res =

calc.Operator.Calculate(1,2); }}

Search pathSlide23

Working with catalogsBart J.F. De SmetSoftware Development Engineer

Microsoft Corporation

demoSlide24

AgendaWhy extensibility mattersExtensibility the naïve wayMEF versus System.Addin

Core concepts

Lots of demos

SummarySlide25

Selection of MEF Preview 6 samplesBart J.F. De SmetSoftware Development Engineer

Microsoft Corporation

demo

http://mef.codeplex.comSlide26

AgendaWhy extensibility mattersExtensibility the naïve wayMEF versus System.Addin

Core concepts

Lots of demos

SummarySlide27

The ABC CCC of MEFSlide28

question & answerSlide29

www.microsoft.com/teched

Sessions On-Demand & Community

http://microsoft.com/technet

Resources for IT Professionals

http://microsoft.com/msdn

Resources for Developers

www.microsoft.com/learning

Microsoft Certification & Training Resources

ResourcesSlide30

Related ContentBreakout Sessions (session codes and titles)

Interactive Theater Sessions (session codes and titles)

Hands-on Labs (session codes and titles)

Hands-on Labs (session codes and titles)Slide31

Track ResourcesResource 1

Resource

2

Resource

3

Resource

4Slide32

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and enter to win!

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2009 Microsoft

Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries.

The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation.

MICROSOFT

MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

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