2011-06-27 - AOP - .NET User Group Rhein Neckar

AspektOrientierteProgrammierungmit .NET
Eine praktische Einführung
27.06.2011
Dipl.-Inf. (FH) Johannes Hoppe

Johannes Hoppe
ASP.NET MVC Webentwickler
www.johanneshoppe.de

01
Architektur und Patterns

Patterns
Entwurfsmuster
==
unser täglicher Job

Beispiel

Aber…

Business Code
publicclassCustomerProcesses
{
publicvoid 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
+ Logging
internalclassCustomerProcesses
{
privatestaticreadonlyTraceSource trace =
newTraceSource( typeof (CustomerProcesses).FullName );

publicvoid RentBook( int bookId, int customerId )
{
trace.TraceInformation(
"Entering CustomerProcesses.CreateCustomer( bookId = {0}, customerId = {1} )",
bookId, customerId ); try{

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
{
newTraceSource(typeof(CustomerProcesses).FullName);

publicvoid RentBook(int bookId, int customerId)
{
if (bookId <= 0) thrownewArgumentOutOfRangeException("bookId");
if (customerId <= 0) thrownewArgumentOutOfRangeException("customerId");

bookId, customerId);

try
{
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,
bookId, customerId, e.Message);
throw;
}
}
}
+ Logging
+ Vorbedingungen

Business Code
+ Logging+ Transaktionen
+ Vorbedingungen
{

{

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

try
{
for (int i = 0; ; i++)
{
try
{
using (var ts = newTransactionScope())
{
Book book = Book.GetById(bookId);
Customer customer = Customer.GetById(customerId);

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

ts.Complete();
}

break;
}
catch (TransactionConflictException)
{
if (i < 3)
continue;
else
throw;
}
}

bookId, customerId);
}
catch (Exception e)
{
trace.TraceEvent(TraceEventType.Error, 0,
bookId, customerId, e.Message);
throw;
}
}
}

Business Code
+ Vorbedingungen + Exception Handling
{

{

try
{

try
{
for ( int i = 0;; i++ )
{
try
{
using ( var ts = newTransactionScope() )
{

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

ts.Complete();
}

break;
}
catch ( TransactionConflictException )
{
if ( i < 3 )
continue;
else
throw;
}
}

}
{
trace.TraceEvent( TraceEventType.Error, 0,
bookId, customerId, e.Message );
throw;
}
}
{
if (ExceptionManager.Handle(e)) throw;
}
}
}

Business Code
+ Vorbedingungen + Exception Handling
+ Feature X
+ Feature Y
+ Feature Z
+ …

Kern-funktionalitäten
(Core Concerns)
SeperationofConcerns

VS
Nicht-Funktionale Anforderungen(CrosscuttingConcerns)

Cross-CuttingConcerns
Data Binding
Thread Sync
Caching
Validation
…
Security
Exception Handling
Tracing
Monitoring
Transaction

OOP
OOP+ AOP

Spring.NET
Castle
MS Unity
PostSharp
LinFu
Build-Time
Run-Time
Hybrid

Erfolgt zur Laufzeit
Code bleibt unverändert
Aufruf wird über Proxy umgeleitet
Zur Laufzeit keine Änderungen
Aufruf wird über Proxyumgeleitet
Aspekte zur Laufzeitkonfigurierbar
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
Build-Time: “Statisch”
Run-Time: “Dynamisch”

02
Live Coding

Logging
LogTimeAspect
webnoteaop.codeplex.com

Exceptions
ConvertExceptionAspect

Validierung
ValidationGuardAspect

Caching
SimpleCacheAspect

03
AOP 1 x 1

AspectJ Begriffe
Join Point
Pointcut
Advice
Aspect

IL Code Vorher
[LogTimeAspect]
publicActionResult Index()
{
IEnumerable<NoteWithCategories> notes =
this.WebNoteService.ReadAll();
return View(notes);
}

IL Code Nachher
publicActionResult 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;
}

OriginaleMethode
Aspect Klasse
OnEntry
try{}
catch (Exception e){}finally{}
Method Body
OnSuccess
OnException
OnExit
: OnMethodBoundaryAspect

Links
Spring.NET
springframework.net
Castle
castleproject.org
Unity
unity.codeplex.com
PostSharp
sharpcrafters.com
Demo Download

FRAGEN?

Vielen Dank!
Johannes Hoppe

Aspect- Typen
MethodBoundaryAspect
OnEntry
OnSuccess
OnException
OnExit
OnExceptionAspect
OnException
MethodInterceptionAspect
OnInvoke
LocationInterceptionAspect
OnGetValue
OnSetValue
EventInterceptionAspect
OnAddHandler
OnRemoveHandler
OnInvokeHandler
MethodImplementationAspect
OnInvoke
CompositionAspect
CreateImplementationObject

Bildnachweise
Ausgewählter Ordner © Spectral-Design – Fotolia.com
Warnhinweis-Schild © Sascha Tiebel – Fotolia.com
Liste abhaken © Dirk Schumann – Fotolia.com
3D rendering of an architecture model 2 © Franck Boston – Fotolia.com
Healthcare © ArtmannWitte – Fotolia.com
Stressed businessman © Selecstock – Fotolia.com

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2011-06-27 - AOP - .NET User Group Rhein Neckar

by Johannes Hoppe on Jun 26, 2011

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2011-06-27 - AOP - .NET User Group Rhein Neckar Presentation Transcript