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Elementi di sistemi Internet e Web

Elementi di sistemi Internet e Web. Prof. Andrea Omicini Corso di Sistemi Distribuiti A.A. 2002/2003 Parte II. Internet: protocolli e servizi. TCP/IP Definisce in pratica Internet Internet come collezione di reti che supportano comunicazione tra host via TCP/IP

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Elementi di sistemi Internet e Web

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  1. Elementi di sistemi Internet e Web Prof. Andrea Omicini Corso di Sistemi Distribuiti A.A. 2002/2003 Parte II

  2. Internet: protocolli e servizi • TCP/IP • Definisce in pratica Internet • Internet come collezione di reti che supportano comunicazione tra host via TCP/IP • Lo stack TCP/IP come elementi abilitante dell’interoperabilità • IP, TCP/UDP • OSI come reference model

  3. OSI come reference model OSI TCP/IP Application ASCII Apps Binary Apps Presentation NVT Session TCP UDP Transport Network IP Data-link Network Topology Physical

  4. Esempio: Layer di mail Client Server Parsing engine Display engine application services Filesystem I/O Database I/O Mail Client Mail server SMTP SMTP r/w data format data open connection send IP packet send datalink frame r/w data format data open connection send IP packet send datalink frame NVT NVT TCP TCP network services IP IP Physical Media Physical Media

  5. Servizi applicativi • Per “porta” • FTP (21) • telnet (22) • SMTP (25) • P0P (110) • HTTP (80) • Da “conoscere” • Già fatti, giusto?

  6. Il Web: elementi • Schema client server • Pattern applicativo • Infrastruttura • Componenti • Server • Apache • Browser • Pattern di interazione

  7. Tecnologie Web • Architettura di riferimento • Three-tier • Presentazione • HTML, CSS, XML, … • Elaborazione client-side • Java Applet, Javascript, … • Elaborazione server-side • CGI, Scripting languages (PHP, Perl, …), Servlet, … • Elaborazione middle-tier • RMI, JDBC, EJB, JSP, …

  8. Principio metodologico • Modello MVC • Model/View/Control • Xerox 1980 • Model • Ontologia – entità e relazioni • View • Presentazione, viste molteplici • Control • Logica dei processi

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