2011-06-27 - aop - .net user group rhein neckar

AspektOrientierteProgrammierungmit .NET

Eine praktische Einführung

27.06.2011Dipl.-Inf. (FH) Johannes Hoppe

AOP

Johannes HoppeASP.NET MVC Webentwickler

www.johanneshoppe.de

AOP

Architektur und Patterns

01

AOP

PatternsEntwurfsmuster

==unser täglicher Job

AOPBeispiel

View

Controller

Model(Business Layer)

Service Layer

Repository Layer

Data Access Layer

AOP

Aber…

AOPBusiness 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; }}

AOPBusiness Code

internal class CustomerProcesses{ private static readonly TraceSource trace = new TraceSource( typeof (CustomerProcesses).FullName );  public void RentBook( int bookId, int customerId ) { trace.TraceInformation( "Entering CustomerProcesses.CreateCustomer( bookId = {0}, customerId = {1} )", bookId, customerId ); try {  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;

trace.TraceInformation( "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; }   }}

+ Logging

AOPBusiness Code

internal class CustomerProcesses{ private static readonly TraceSource trace = 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");  trace.TraceInformation( "Entering CustomerProcesses.CreateCustomer( bookId = {0}, customerId = {1} )", bookId, customerId);  try { 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;  trace.TraceInformation( "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; } }}

+ Logging+ Vorbedingungen

AOPBusiness Code

+ Logging + Transaktionen + Vorbedingungen

internal class CustomerProcesses{ private static readonly TraceSource trace = 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");  trace.TraceInformation( "Entering CustomerProcesses.CreateCustomer( bookId = {0}, customerId = {1} )“, bookId, customerId);  try { for (int i = 0; ; i++) { try { using (var ts = new TransactionScope()) { 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;  ts.Complete(); }

  break; } catch (TransactionConflictException) { if (i < 3) continue; else throw; } }  trace.TraceInformation( "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; } }

}

AOPBusiness Code

+ Logging + Transaktionen + Vorbedingungen + Exception Handling

internal class CustomerProcesses{ private static readonly TraceSource trace = 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");  try { trace.TraceInformation( "Entering CustomerProcesses.CreateCustomer( bookId = {0}, customerId = {1} )", bookId, customerId );  try { for ( int i = 0;; i++ ) { try { using ( var ts = new TransactionScope() ) { 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; 

ts.Complete(); }  break; } catch ( TransactionConflictException ) { if ( i < 3 ) continue; else throw; } }  trace.TraceInformation( "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; } } catch ( Exception e ) { if (ExceptionManager.Handle(e)) throw; } }}

AOPBusiness Code

+ Logging + Transaktionen + Vorbedingungen + Exception Handling

+ Feature X+ Feature Y+ Feature Z+ …

AOP

Kern-funktionalität

en(Core Concerns)

Seperationof

Concerns

AOP

VS

AOP

Nicht-Funktionale

Anforderungen

(Crosscutting Concerns)

VS

AOP

SecurityException

HandlingTracingMonitoringTransaction

Data BindingThread SyncCachingValidation…

Cross-Cutting Concerns

AOP

OOP

OOP

+ AOP

AOP

Build-Time Run-TimeHybrid

PostSharp

Spring.NETCastleMS Unity

LinFu

AOP

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

Erfolgt bei Kompilierung

Code wird direkt verändert

Keine Interfaces erforderlich

Zur Laufzeit keine Änderungen

Auch auf Properties, Felder,Events anwendbar

Kann Member und Interfaces hinzufügen

Erfolgt zur Laufzeit

Code bleibt unverändert

Aufruf wird über Proxy umgeleitet

Zur Laufzeit keine Änderungen

Aufruf wird über Proxyumgeleitet

Aspekte zur Laufzeitkonfigurierbar

AOP

Live Coding

02

AOP

AOP

LoggingLogTimeAspect

webnoteaop.codeplex.com

AOP

ExceptionsConvertExceptionAspect

webnoteaop.codeplex.com

AOP

ValidierungValidationGuardAspect

webnoteaop.codeplex.com

AOP

CachingSimpleCacheAspect

webnoteaop.codeplex.com

AOP

AOP

AOP 1 x 1

03

AOPAspectJ Begriffe

Join PointPointcutAdviceAspect

AOPAspectJ Begriffe

Join PointPointcutAdviceAspect

AOPIL Code Vorher

[LogTimeAspect]public ActionResult Index(){ IEnumerable<NoteWithCategories> notes = this.WebNoteService.ReadAll(); return View(notes);}

AOPIL 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); try { 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;}

AOP

: OnMethodBoundaryAspect

try{

}catch (Exception e){ }finally{

}

OnEntry

OnSuccess

OnException

OnExit

Originale Methode Aspect Klasse

Method Body

AOPLinks

Spring.NETspringframework.net

Castlecastleproject.org

Unityunity.codeplex.com

PostSharpsharpcrafters.com

Demo Downloadwebnoteaop.codeplex.com

FRAGEN?

Vielen Dank!Johannes Hoppe

AOP

› MethodBoundaryAspect› OnEntry› OnSuccess› OnException› OnExit

› OnExceptionAspect› OnException

› MethodInterceptionAspect› OnInvoke

› LocationInterceptionAspect› OnGetValue› OnSetValue

› EventInterceptionAspect› OnAddHandler› OnRemoveHandler› OnInvokeHandler

› MethodImplementationAspect› OnInvoke

› CompositionAspect› CreateImplementationObject

Aspect- Typen

AOP

Bildnachweise

Ausgewählter Ordner © Spectral-Design – Fotolia.comWarnhinweis-Schild © Sascha Tiebel – Fotolia.comListe abhaken © Dirk Schumann – Fotolia.com3D rendering of an architecture model 2 © Franck Boston –

Fotolia.comHealthcare © ArtmannWitte – Fotolia.comStressed businessman © Selecstock – Fotolia.com