Tehnologii de Programare in Internet TPI /...
Transcript of Tehnologii de Programare in Internet TPI /...
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Tehnologii de Programare in Internet
(TPI / RST)
Titulari curs: Eduard-Cristian Popovici, Mihnea-Andrei Magheti
Suport curs: http://discipline.elcom.pub.ro/tpi/
Moodle: http://electronica07.curs.ncit.pub.ro/course/category.php?id=3
UPB – Facultatea ETTI – Curs TPI – an III – RST
2013 - 2014
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Obiectivele disciplinei
UPB – Facultatea ETTI – Curs TPI – an III – RST
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Obiective curs (2009):
Prezentarea unor tehnologii de programare larg utilizate in Internet:
- Desktop (comunicatii la nivel socket TCP si UDP),
- Web (tehnologii pentru client si server HTTP),
- Mobile (Android, Windows 8/Phone);
- Acces la Baze de Date, acces la Servicii Web, etc.;
folosind diferite limbaje de programare: Java, XML, C#, HTML(5), SQL, etc.
Obiective aplicaţii (2009):
Crearea abilităţilor de a aplica cunoştinţele generale privind tehnologiile de
programare predate, in cadrul mai multor categorii de mini-proiecte.
Posibilitatea de a alege si concepe arhitectura si componentele software
necesare, si de a realiza programe concrete care sa raspunda cerintelor
formulate.
Obiectivele disciplinei
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Structura cursului (2014)
UPB – Facultatea ETTI – Curs TPI – an III – RST
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Structura cursului
1. Introducere in tehnologiile de programare in Internet
2. Introducere in tehnologiile desktop (SE) Java Programarea la nivel socket
3. Tehnologii de programare a aplicatiilor Web in diverse limbaje
4. Tehnologii de programare a aplicatiilor mobile (Android, Windows 8/Phone)
Continut curs TPI
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Structura cursului
1. Introducere in tehnologiile Internet
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1. Introducere in TPI
Transmiterea mesajelor in reteaua locala si in Internet (reteaua
de retele globala)
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1. Introducere in TPI
Comunicatia prin comutatie de pachete (IP) vs comutatie de circuite
IP
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Modelul comunicatiilor in Internet
Rutarea mesajelor in Internet (la nivel IP – Internet Protocol)
1. Introducere in TPI
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1. Introducere in TPI
Comunicatie prin mesaje non-fiabila (fara confirmare sau
retransmisie) ca in
- IP (Internet Protocol) si
- UDP (User Datagram Protocol)
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Comunicatie prin mesaje fiabila (confirmare+retransmisie)
- ca in TCP
1. Introducere in TPI
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1. Introducere in TPI
Modele de comunicatie stratificata
Exemplul unui dialog la distanta intre interlocutori de limbi diferite
1. Nivelul cel mai inalt (abstract)
2. Detaliind utilizarea unor traducatori (nivel intermediar)
Vorbitor de
limba A
Vorbitor de
limba B
Mediu de comunicatie
Dialog (nivel logic)
Protocol (set de reguli)
specific dialogului
Comunicatie propriu-zisa (nivel “fizic”)
Vorbitor de
limba A
Vorbitor de
limba B
Traducator Traducator
Mediu de comunicatie
Dialog virtual
Protocol (set de reguli)
specific dialogului
Protocol (set de reguli)
specific traducerilor
Dialog (nivel logic)
Comunicatie propriu-zisa (nivel “fizic”)
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1. Introducere in TPI
Modele de comunicatie stratificata
Exemplul unui dialog la distanta intre interlocutori de limbi diferite
3. Detaliind utilizarea unui suport tehnic local si a unui sistem de
comunicatie propriu-zis
Vorbitor de
limba A
Vorbitor de
limba B
Traducator Traducator
Suport tehnic
transfer
Suport tehnic
transfer
Sistem de comunicatie (incluzand protocoale specifice comunicatiei)
Protocol (set de reguli)
specific dialogului
Protocol (set de reguli)
specific traducerilor
Protocol (set de reguli)
specific transferului
Dialog virtual
Dialog (nivel logic)
Comunicatie propriu-zisa (nivel “fizic”)
Dialog (nivel logic)
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1. Introducere in TPI
Modele de comunicatie stratificata
Protocolul de comunicatie este un
- set de reguli si conventii care au fost convenite intre participantii la o
comunicatie pentru a asigura buna desfasurare a dialogului
- bazat pe mesaje / pachete / cadre / etc. (unitati de date) schimbate si pe
primitive / automate / etc. (elemente de comportament)
Interactiunile pe orizontala se desfasoara
- conform protocolului de la respectivul nivel, care consta in interactiuni
virtuale, realizate prin interactiuni la nivelurile inferioare
Interactiunile pe verticala
- transmit si preiau sarcini si unitati de date cu scopul transferului unitatilor
de date catre / de la partenerul de la acelasi nivel
Serviciul este un
- set de functii posibil de oferit de catre nivelul inferior, respectiv
- setul de sarcini posibil de solicitat de catre nivelul superior, in
interactiunile pe verticala
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Impachetarea
octetilor din
fluxul de date
ai Aplicatiei in
segmente TCP
Incapsularea
segmentelor in
Datagrame IP
Transmisia
Datagramelor
IP prin Internet
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1. Introducere in TPI
Modelul comunicatiilor in Internet
Fluxurile de date, conexiunile logice si stivele de protocoale de
comunicatie
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1. Introducere in TPI
Modelul
comunicatiilor
in Internet
Stiva de
protocoale de
comunicatie
TCP/IP Subsistemul
superior
(aplicatie)
Nivelul
intermediar
(transport)
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1. Introducere in TPI
Modelul
comunicatiilor
in Internet
Stiva de
protocoale de
comunicatie
TCP/IP
Subsistemul
inferior (retea)
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TPI 18.02.2014 11:30 19
Modelul
comunicatiilor
in Internet
Stiva de
protocoale de
comunicatie
TCP/IP
vs
Stiva de referinta
OSI a
protocoalelor de
comunicatie
si rolul fiecarui
nivel in parte
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1. Introducere in TPI
Modul in care aplicatiile folosesc protocoalele TCP si UDP
Nivelul
intermediar
(transport)
Adrese IP
Numere port
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Datagrame IP
Datagrame UDP “Flux TCP”
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1. Introducere in TPI
Utilizarea adreselor IP pentru a identifica entitatile din Internet
Porturile (80 al server-ului si 3022 al client-ului) permit identificarea
proceselor / protocoalelor la nivel aplicatie
Datagrama IP
Datagrama IP
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1. Introducere in TPI
Modelul comunicatiilor in Internet
Utilizarea serviciului DNS (Domain Name Server) pentru obtinerea
adresei numerice IP echivalenta numelui masinii de calcul
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Modelul
comunicatiilor in
Internet
Utilizarea
serviciului DNS
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1. Introducere in TPI
Modele de comunicatie prin mesaje
- unicast (1 la 1)
- broadcast (difuzare
catre oricine)
- multicast (1 la N)
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1. Introducere in TPI
Modelul de comunicatie client-server
Comunicatie prin mesaje cerere – raspuns (tranzactionala)
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1. Introducere in TPI
Modelul de comunicatie client-server (tranzactional)
Client-server HTTP (HyperText Transport Protocol) peste TCP/IP
Tranzactii HTTP
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1. Introducere in TPI
Modelul client-server Web (cerere-raspuns HTTP)
Hypertext vs text liniar
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1. Introducere in TPI
Modelul client-server Web (cerere-raspuns HTTP)
Hypertext vs text liniar
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1. Introducere in TPI
Modelul client-server Web (cerere-raspuns HTTP)
Publicarea continutului HTML (1+2) si accesul la continut (3+4)
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1. Introducere in TPI
Modelul comunicatiilor in Internet
Formatul pachetului IP (structura de biti)
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1. Introducere in TPI
Modelul client-server Web (cerere-raspuns HTTP)
Formatul cererii HTTP
(text)
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1. Introducere in TPI
Modelul client-server Web (cerere-raspuns HTTP)
Formatul raspunsului HTTP
(text)
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1. Introducere in TPI
Modelul client-server cu tehnologii Java
Sistemul client poate contine aplicatii de sine statatoare (desktop - Java SE)
sau browsere si continut Web, si optional JavaBeans
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1. Introducere in TPI
Modelul client-server cu tehnologii Java
Subsistemul Web al serverului contine componente Web (Java EE): servlet-
uri Java si JSP (Java ServerPages), si optional JavaBeans
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1. Introducere in TPI
Modelul client-server cu tehnologii Java
Subsistemul business al serverului indeplineste sarcinile aplicatiei, poate fi
distribuit, contine componentele business (EJB – Enterprise JavaBeans):
- bean-uri entitate (in EJB 2.x) sau entitati persistente (in EJB 3.0),
- bean-uri sesiune si bean-uri pt. comunicatii asincrone (MDB)
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1. Introducere in TPI
Modelul client-server cu tehnologii Java
Subsistemul de integrare si management al datelor aplicatiei (EIS tier), contine
elemente care furnizeaza/stocheaza datele aplicatiei (baze de date)
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1. Introducere in TPI
Modelul client-server cu tehnologii Java
Arhitectura Java EE se bazeaza pe mai multe containere (ofera servicii de nivel
jos / suport specifice platformei) aflate pe serverul aplicatiei Web
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1. Introducere in TPI
Tehnologii client
- Windows
- Windows Phone (mobil)
- Windows 8 (desktop/laptop)
- Java
- Android, Java ME (Mobile Edition) (mobil)
- Java SE (Standard Edition) (desktop/laptop)
Tehnologii server
- Windows
- .Net
- Java
- Java EE (Enterprise Edition)
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1. Introducere in TPI
Alte tehnologii client
- HTML/HTML5 (limbajul continutului Web)
- scripting interactivitate utilizator (JavaScript, etc.)
- mobil multiplatforma (PhoneGap, etc.)
Tehnologii server
- scripting (Python, etc.)
- servicii Web
- clasice (cu interfata, specificare, transport in formate XML/JSON)
(JSON = JavaScript Object Notation)
- REST (transport in format HTTP)
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1. Introducere in TPI
Elemente esentiale ale programarii?
Elemente structurale / statice
Date
Informatii
Variabila
Spatiu ocupat
Zona de memorie
Alocare
Tip de date
Conversie de tip
Structura de date
Scop (vizibilitate interna)
Variabila locala
Parametru
Argument
Pointer
Dereferire
Referinta
Structura alocata dinamic
Nivel de acces (vizibilitate externa) v
Obiect
Clasa
Subclasare
Clasa abstracta
Interfata (in Java, UML)
Atribut (camp / variabila membru)
Atribut mostenit
Atribut ascuns
Polimorfismul atributelor
Referinta spre sine (atribute proprii)
Referinta spre atribute mostenite
Conventii Java
- Clase
- variabile, cuvinte cheie
- CONSTANTE
OO
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1. Introducere in TPI
Elemente esentiale ale programarii?
Elemente comportamentale/dinamice
Operator
Precedenta
Asocierea operatorilor cu tipurile de date
Instructiune
Atribuire
Initializare
Functie (metoda)
Apel (invocare)
Returnare
Semnatura
Supraincarea numelor functiilor
Constructor
Constructor implicit
Supraincarea numelor constructorilor
Metoda mostenita
Metoda rescrisa
Polimorfismul metodelor
Apelul la constructor propriu
Apelul la constructor mostenit
Referinta spre sine (metode proprii)
Referinta spre metode mostenite
Conventii Java
- metoda()
- Constructor()
OO
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1. Introducere in TPI
Elemente esentiale ale programarii?
Elemente structurale / statice
Date
Informatii
Variabila
Spatiu ocupat
Zona de memorie
Alocare
Tip de date
Conversie de tip
Structura de date
Scop (vizibilitate interna)
Variabila locala
Parametru
Argument
Pointer
Dereferire
Referinta
Structura alocata dinamic
Nivel de acces (vizibilitate externa)
Obiect
Clasa
Subclasare
Clasa abstracta
Interfata (in Java, UML)
Atribut (camp / variabila membru)
Atribut mostenit
Atribut ascuns
Polimorfismul atributelor
Referinta spre sine (atribute proprii)
Referinta spre atribute mostenite
Conventii Java
- Clase
- variabile, cuvinte cheie
- CONSTANTE
Stack/Heap
new Heap
final
abstract
class
public/protected/private
interface
this.
super.
extends
( )
OO
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1. Introducere in TPI
Elemente esentiale ale programarii?
Elemente comportamentale/dinamice
Operator
Precedenta
Asocierea operatorilor cu tipurile de date
Instructiune
Atribuire
Initializare
Functie (metoda)
Apel (invocare)
Returnare
Semnatura
Supraincarea numelor functiilor
Constructor
Constructor implicit
Supraincarea numelor constructorilor
Metoda mostenita
Metoda rescrisa
Polimorfismul metodelor
Apelul la constructor propriu
Apelul la constructor mostenit
Referinta spre sine (metode proprii)
Referinta spre metode mostenite
Conventii Java
- metoda()
- Constructor()
this.
super.
this()
super()
OO