2012-04-12 - AOP .NET UserGroup Niederrhein

transcript

12.04.2012

Dipl.-Inf. (FH) Johannes Hoppe

AOP mit .NET

Johannes Hoppe ASP.NET MVC Webentwickler

www.johanneshoppe.de

Architektur und Patterns

Patterns software craftsmanship

Business Code

public class CustomerProcesses

public void RentBook( int bookId, int customerId )

Book book = Book.GetById( bookId );

Customer customer = Customer.GetById( customerId );

book.RentedTo = customer;

customer.AccountLines.Add(

string.Format( "Rental of book {0}.", book ), book.RentalPrice

customer.Balance -= book.RentalPrice;

Business Code

public class CustomerProcesses

string.Format( "Rental of book {0}.", book ), book.RentalPrice

+ Logging

Business Code

internal class CustomerProcesses

private static readonly TraceSource trace =

new TraceSource( typeof (CustomerProcesses).FullName );

trace.TraceInformation(

"Entering CustomerProcesses.CreateCustomer( bookId = {0},

customerId = {1} )",

bookId, customerId );

string.Format( "Rental of book {0}.", book ), book.RentalPrice );

"Leaving CustomerProcesses.CreateCustomer( bookId = {0}, customerId = {1} )",

catch ( Exception e )

trace.TraceEvent( TraceEventType.Error, 0,

"Exception: CustomerProcesses.CreateCustomer(

bookId = {0}, customerId = {1} ) failed : {2}",

bookId, customerId, e.Message );

throw;

+ Logging

+ Vorbedingungen

Business Code

new TraceSource(typeof(CustomerProcesses).FullName);

public void RentBook(int bookId, int customerId)

if (bookId <= 0) throw new ArgumentOutOfRangeException("bookId");

if (customerId <= 0) throw new ArgumentOutOfRangeException("customerId");

"Entering CustomerProcesses.CreateCustomer( bookId = {0}, customerId = {1} )",

bookId, customerId);

Book book = Book.GetById(bookId);

Customer customer = Customer.GetById(customerId);

customer.AccountLines.Add(string.Format("Rental of book {0}.", book),

book.RentalPrice);

"Leaving CustomerProcesses.CreateCustomer( bookId = {0},

customerId = {1} )“, bookId, customerId);

catch (Exception e)

trace.TraceEvent(TraceEventType.Error, 0,

"Exception: CustomerProcesses.CreateCustomer( bookId = {0},

customerId = {1} ) failed : {2}",

bookId, customerId, e.Message);

throw;

Business Code

+ Logging + Transaktionen

+ Vorbedingungen

if (bookId <= 0)

throw new ArgumentOutOfRangeException("bookId");

if (customerId <= 0)

throw new ArgumentOutOfRangeException("customerId");

"Entering CustomerProcesses.CreateCustomer( bookId = {0},

customerId = {1} )“, bookId, customerId);

for (int i = 0; ; i++)

using (var ts = new TransactionScope())

Book book = Book.GetById(bookId);

Customer customer =

Customer.GetById(customerId);

string.Format("Rental of book {0}.", book),

book.RentalPrice);

ts.Complete();

break;

catch (TransactionConflictException)

if (i < 3)

continue;

throw;

"Leaving CustomerProcesses.CreateCustomer(

bookId = {0}, customerId = {1} )",

bookId, customerId);

catch (Exception e)

trace.TraceEvent(TraceEventType.Error, 0,

"Exception: CustomerProcesses.CreateCustomer( bookId = {0},

customerId = {1} ) failed : {2}",

bookId, customerId, e.Message);

throw;

Business Code

+ Vorbedingungen + Exception Handling

if (bookId <= 0) throw new ArgumentOutOfRangeException("bookId");

if (customerId <= 0)

throw new ArgumentOutOfRangeException("customerId");

"Entering CustomerProcesses.CreateCustomer(

for ( int i = 0;; i++ )

using ( var ts = new TransactionScope() )

string.Format( "Rental of book {0}.", book ),

book.RentalPrice );

ts.Complete();

break;

catch ( TransactionConflictException )

if ( i < 3 )

continue;

throw;

"Leaving CustomerProcesses.CreateCustomer(

trace.TraceEvent( TraceEventType.Error, 0,

"Exception: CustomerProcesses.CreateCustomer(

bookId = {0}, customerId = {1} ) failed : {2}",

bookId, customerId, e.Message );

throw;

if (ExceptionManager.Handle(e)) throw;

Business Code

+ Vorbedingungen + Exception Handling

+ Feature X

+ Feature Y

+ Feature Z

funktionalitäten (Core Concerns)

Seperation

of Concerns

Nicht-

Funktionale

Anforderungen (Crosscutting Concerns)

Security

Exception Handling

Tracing

Monitoring

Transaction

Data Binding

Thread Sync

Caching

Validation

Cross-Cutting Concerns

Build-Time Run-Time Hybrid

PostSharp

Spring.NET

Castle

MS Unity LinFu

Erfolgt bei Kompilierung

Code wird direkt verändert

Zur Laufzeit keine Änderungen

Auch auf Properties, Felder,

Events anwendbar

Keine Interfaces erforderlich

Erfolgt zur Laufzeit

Code bleibt unverändert

Zur Laufzeit Änderungen möglich

Aufruf wird über Proxy

umgeleitet

idR. Interfaces erforderlich (Proxy)

Build-Time: “Statisch” Run-Time: “Dynamisch”

Live Coding

Logging LogTimeAspect

webnoteaop.codeplex.com

Exceptions ConvertExceptionAspect

Validierung ValidationGuardAspect

Caching SimpleCacheAspect

AOP 1 x 1

AspectJ Begriffe

Join Point

Pointcut

Advice

Aspect

AspectJ Begriffe

Join Point

Pointcut

Advice

Aspect

IL Code Vorher

[LogTimeAspect]

public ActionResult Index()

IEnumerable<NoteWithCategories> notes =

this.WebNoteService.ReadAll();

return View(notes);

IL Code Nachher

public ActionResult Index()

ActionResult CS$1$2__returnValue;

MethodExecutionArgs CS$0$3__aspectArgs =

new MethodExecutionArgs(null, null);

<>z__Aspects.a68.OnEntry(CS$0$3__aspectArgs);

IEnumerable<NoteWithCategories> notes =

this.WebNoteService.ReadAll();

ActionResult CS$1$0000 = base.View(notes);

CS$1$2__returnValue = CS$1$0000;

finally

<>z__Aspects.a68.OnExit(CS$0$3__aspectArgs);

return CS$1$2__returnValue;

: OnMethodBoundaryAspect

try { } catch (Exception e) { } finally { }

OnEntry

OnSuccess

OnException

OnExit

Originale Methode Aspekt Klasse

Method Body

Installation

www.sharpcrafters.com/postsharp/download

nuget http://nuget.org/packages/PostSharp

Spring.NET springframework.net

Castle castleproject.org

Unity unity.codeplex.com

PostSharp sharpcrafters.com

Demo Download webnoteaop.codeplex.com

FRAGEN?

Bis bald › 10.05.2012 – .NET UG Karlsruhe: NoSQL

› 14.05.2012 – .NET Developer Conference (DDC)

.Nürnberg: NoSQL

Vielen Dank!

› MethodBoundaryAspect

› OnEntry

› OnSuccess

› OnException

› OnExit

› OnExceptionAspect

› OnException

› MethodInterceptionAspect

› OnInvoke

› LocationInterceptionAspect

› OnGetValue

› OnSetValue

› EventInterceptionAspect

› OnAddHandler

› OnRemoveHandler

› OnInvokeHandler

› MethodImplementationAspect

› OnInvoke

› CompositionAspect

› CreateImplementationObject

Primitive Aspekt-Typen

Bildnachweise

2012-04-12 - AOP .NET UserGroup Niederrhein

Technology