Ingegneria del software I

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Ingegneria del software I
Seminario 2 Microsoft .NET
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Microsoft.NET piattaforma
Visual Studio.NET
.NET Enterprise Servers
.NET Building Block Services
.NET Devices, User Experience
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Microsoft.NET piattaforma
Visual Studio.NET
.NET Enterprise Servers
.NET Building Block Services
.NET Devices, User Experience
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Visual Studio.NET

• Framework per sviluppo ed integrazione dei .NET
  Enterprise Servers sia con .NET building block
  services che .NET devices. 6

VB
C
C
Scripts

CLS (Common Language Specification)
ASP.NET
Web Service
Web Form
Integrates into the system
ADO.NET Data and XML
Base Class Library
CLR (Common Language Runtime)
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CLS (Common Language Specification)

• È un insieme di specifiche per linteroperabilità
  tra linguaggi. 7
• È un insieme di specifiche di compilazione per
  lindipendenza dai linguaggi. 8
• Sono definiti tipi, metodi, campi, proprietà,
  enumerazioni, eccezioni, interfacce, eventi, etc.

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CLR (Common Language Runtime)

• Carica ed esegue codice scritto in runtime-aware
  per i linguaggi di programmazione. 14
• Le caratteristiche dellambiente runtime 14
• cross-language integration
• self-describing components
• simple deployment and versioning
• integrated security services.
• Un unico framework per il progetto, lo sviluppo,
  limplementazione, e lesecuzione di componenti
  ed applicazioni distribuiti. 9

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Microsoft.NET Platform
Visual Studio.NET
.NET Enterprise Servers
.NET Building Block Services
.NET Devices, User Experience
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.NET Enterprise Server Configuration
Exchange Server 2000
Mainframe / Other Data Sources
SQL Server 2000
Host Integration Server 2000
COM
Mobile Information Server 2000
Mobile Devices
BizTalk Server 2000
Internet Security Acceleration Server 2000
Supplier / Consumer of XML e-documents
Application Center 2000
Internet Information Server
Clients on the web
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Microsoft .NET Framework
ASP
Win Forms
Web Forms
Web Services
Services FrameWork
Base
Data
Debug
. . .
Common Language Runtime
System Services
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Service Framework

• Fornisce classi di oggetti a supporto degli
  sviluppatori per .NET. 14

Base Classes
Programming Tools
Type System
Debugging/Trace
I/O and Network
Resources
Component Model
Configuration/Install
Drawing (GDI)
EventLog/PerfCounter
Threading
Globalization
Cryptography
Serialization
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Il linguaggio C

• Caratteristiche del C 16
• Semplicità
• Type safe
• Consistenza
• Supporto alle versioni
• Object Orientation
• Flessibilità

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C - caratteristiche

• Complessità del C,
• -gt / / . notazioni criptiche
• Particolari tipo di dato wchar_t, __int64
• Utilizzo degli interi come booleani,
• problema del e
• In C,
• Notazione principale è il ..
• È stato introdotto il tipo bool per eliminare
  confusioni

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C - caratteristiche

• In C non ci sono puntatori.
• La gestione della memoria è a carico del garbage
  collector fornito con lambiente .NET
• Usando la modalità unsafe si può comunque
  accedere alla memoria direttamente.

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C - Object Orientation

• Incapsulamento, ereditarietà, polimorfismo
• I metodi della classi non sono virtual per
  default
• public, private, protected e internal
• Lereditarietà permessa è singola

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C - Type Safety

• Le variabili non inizializzate non sono ammesse
• Il casting dei tipi ad UNSAFE non è permesso
• Data overflow, array index boundary checking

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Un semplice esempio in C

• hello world.
• using System
• class Hello
• public static void Main(string args)
• Console.WriteLine(hello, world)
• // print the command line arguments
• for (int i 0 arg lt args.Length i)
• Console.WriteLine(arg 0,1, i,
  argsi)

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SDC (Self-Describing Components)

• I servizi forniti dal runtime sono metadata
  driven, questi metadati aggiungono informazioni
  agli eseguibili, come le definizioni di
  interfacce che prima specificate in IDL, TLB,
  proxy/stubs.

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Architettura dei Web Services
Web Service Developer
Web Application Developer
? Author class, ASMX
? Request SCL
? Author Page that calls the Proxy
Web Service ASMX
? Deploy Application
Web Server
Web Application ASMX
? Run Method
SDL
ASPX
? Run Proxy Generator
? Deploy Application
C, VB
? Deploy Application
Web Server
? Call Methods
Web Form
Proxy
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Web Service, ASMX

• Web service server salvato come asmx file.
• Richieste di web services basate su comunicazioni
  XML / SOAP.
• Oggetti e risorse accessibili via URL

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Web Service Development
Web Service Developer
Web Application Developer
? Author class, ASMX
? Request SCL
? Author Page that calls the Proxy
Web Service ASMX
? Deploy Application
Web Server
Web Application ASMX
? Run Method
SDL
ASPX
? Run Proxy Generator
? Deploy Application
C, VB
? Deploy Application
Web Server
? Call Methods
Web Form
Proxy
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1 Author Class, ASMX

• lt_at_ WebService Language"C" ClassMyService" gt
• using System
• using System.Web.Services
• public class MyService
• WebMethod
• public String MyServiceFunction1(String
  strParm1, String strParm2)
• ...
• WebMethod
• public void MyServiceFunction2(Integer intParm)
  
• ...

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? Deploy Application

• Per implementare lapplicazione web va copiato il
  file ASMX nel web folder.

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Web Application, ASPX

• Per utilizzare i web services va creato un
  Proxy.
• Proxies sono creati in DLL compilando il codice
  stub genrato dal proxy generator.
• Il proxy generator genera il codice stub dal SDL
  che è esportato dai web services.

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Web Application Development
Web Service Developer
Web Application Developer
? Author class, ASMX
? Request SCL
? Author Page that calls the Proxy
Web Service ASMX
? Deploy Application
Web Server
Web Application ASMX
? Run Method
SDL
ASPX
? Run Proxy Generator
? Deploy Application
C, VB
? Deploy Application
Web Server
? Call Methods
Web Form
Proxy
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? Request SCL ? Run Proxy Generator

• Creazione del codice del Proxy da SDL.
• Webserviceutil
• /cproxy /pahttp//hostname/MyService.asmx?SDL
  /lCsharp
• /nMyServices
• /cproxy Crea codice del Proxy dal SDL
• /paURL Specifica URL per il SCL(SDL)
• /llanguage Specifica il linguaggio sorgente
• /nnamespace Specifica il namespace del proxy

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? Deploy (Proxy) Application

• Compila il codice generato e copia il file DLL
  nel web folder per implementare il proxy.
• csc /out..\bin\MyService.dll /tlibrary
• /rsystem.data.dll /rsystem.web.services.dll
• /rsystem.xml.serialization.dll MyService.cs

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? Author ASPX

• lt_at_ Import Namespace"System.Web.UI.WebControls"
  gt
• lt_at_ Import NamespaceMyServices" gt
• ltHTMLgt
• ltHEADgt
• ltTITLEgtMy Service Pagelt/TITLEgt
• ltSCRIPT LANGUAGE"C" RUNAT"SERVER"gt
• MyService s new MyService() // my service
• String strResult
• strResult s.MyServiceFunction1(Hello,
  World)
• s.MyServiceFunction2(12345)
• ...

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? Deploy (Web) Application

• Per implementare lapplicazione web va copiato il
  file ASPX nel web folder.

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The innovative feature

• MyService.ASPX
• ...
• ltSCRIPT LANGUAGE"C" RUNAT"SERVER"gt
• Calendar c
• SelectedDatesCollection dtSelectedPeriod
• ...
• c CALENDAR
• ...
• dtSelectedPeriod calendar.SelectedDates
• ...
• lt/SCRIPTgt
• ...
• ltASPCALENDAR id"CALENDAR" runat"server"
  ALIGNLEFT
• CellPadding"3" CellSpacing"1"
  DayNameFormat"FirstLetter"
• FirstDayOfWeek"Default" NextMonthText"gt
• ...
• /gt

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Servizio web scheduler
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References

• 1 Microsoft.NET, http//www.microsoft.com/net/
  default.asp
• 2 The simplest way to define .NET,
  http//www.microsoft.com/net/defining.asp
• 3 An Introduction to Microsoft Hailstorm,
  http//www.microsoft.com/net/hailstorm.asp
• 4 Bill Gates Web Site Speeches,
  http//www.microsoft.com/billgates/speeches/2001/0
  3-19hailstorm.asp
• 5 Microsoft Announces Hailstorm, a New Set
  of XML Web Services Designed ,
  http//www.microsoft.com/presspass/features/2001/m
  ar01/03-19hailstorm.asp
• 6 G. Lee, Paradigm shift in software
  development environment, MS Visual Studio.NET,
  Microsoftware, pp. 202 213, Korea, Jan. 2001.
• 7 Introduction to the Common Language
  Specification (CLS), http//msdn.microsoft.com/li
  brary/dotnet/cpapndx/_cor_introduction_to_the_comm
  on_language_specification__cls_.htm
• 8 What is Common Language Specification?,
  http//msdn.microsoft.com/library/dotnet/cpguide/c
  pconwhatiscommonlanguagespecification.htm
• 9 Overview of the Common Language Runtime,
  http//msdn.microsoft.com/library/dotnet/cpapndx/_
  cor_overview_of_the__common_language_runtime.htm

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References

• 10 Microsoft.NET in Retail and Hospitality,
  http//www.microsoft.com/technet/net/NETRetal.asp
• 11 Microsoft.NET for Manufacturing Extending
  the Enterprise Through Open Protocols,
  http//www.microsoft.com/technet/ecommerce/netmanu
  .asp
• 12 Microsoft .NET Platform What it is,
• http//www.microsoft.com/ISN/IndOutlook_Tre
  nds/NET_Platform_what_it_is.asp
• 13 Overview of Microsoft.NET,
  http//www.microsoft.com/ISN/IndOutlook_Trends/ms_
  net_overview.asp
• 14 The Programmable Web, http//msdn.microsoft
  .com/msdnmag/issues/0900/webplatform/webplatform.a
  sp
• 15 Build Web Applications Faster and Easier
  Using Web Services and XML, http//msdn.microsoft
  .com/msdnmag/issues/0900/VSNET/VSNET.asp
• 16 Sharp New Language C Offers the Power of
  C and Simplicity of Visual Basic,
  http//msdn.microsoft.com/msdnmag/issues/0900/csha
  rp/csharp.asp
• 17 G. Kim, The announcement of Hailstorm
  composed of XML web services, Microsoftware,
  p. 172, Korea, Apr. 2001.