Software and systems engineering Paulo Borba Informatics Center Federal University of Pernambuco

[email protected] ◈ twitter.com/pauloborba

Evaluation of the configuration management class

• Only 22 answers (28 for the first class)! • "Mesmo que todos tenham lido o capítulo, seria uma boa … dar um resumo”

• ''uma revisão do workflow com a participação dos alunos”

• "prática... É melhor do que só ir pelo slide. • "ela poderia ter sido mais pratica, e os materiais centralizados”

Class structure • Check previous activities • Log into google with your CIn account • Access and answer today’s questions (…) • Discuss class material

• what haven’t you understood? what don’t you agree? what haven’t you liked? what are you missing to perform the project task?

• Hands-on application development

Software as a Service (SaaS) • Delivers software and data as a service over the Internet

• No need to install applications • No need to backup or share data • Easier to improve the service

Client-server architecture

http://www.flickr.com/photos/29712319@N02/3272870058/

Client-server structure and behavior Client (firefox) Server (rgms.com)

Internet Client (safari)

requests

replies

Pattern principles • Separation of concerns between clients and servers

• Separates functionality and processing place • Different interfaces for each server

Client-server communication protocols GET http://rgms.com:80/rgms/periodico/search?inst=ufpe&year=2014 POST http://localhost:8080/rgms/book/show/1

Client (firefox)

HTTP Internet

Client (safari)

Server (rgms.com)

TCP/IP

GET http://hostname:port/resource_path?query_terms POST http://hostname:port/resource_path

Exploring the protocols and architecture • Simulating state with cookies • Simulating Server Push with Client Pull and polling

HTML POST http://localhost:8080/rgms/book/show/2

Client (firefox)

HTTP Internet

Client (safari)

TCP/IP

Server (rgms.com)

HTML for service invocation

HTML for service result… and invocation!

CSS references page elements

HTML

defines as visual attributes file

3-Tier architecture Client (firefox) Server (rgms.com)

Internet Client (safari)

Web server

Presentation tier

Application server

Logic tier

Database

Persistence tier

ModelViewController architecture

Controller 1

Controller 2

Controller n

Model 2

Model 1 Views Views 1 1 1

Views Views 1 1 2

Model n Views Views 1 1 n

Routes and REST • Maps between URI and HTTP method

(GET, POST, etc.) to controller and action

• Web application entities are viewed as resources

• HTTP requests then identify resource and the action to be performed on it

Template Views

Software and systems engineering Paulo Borba Informatics Center Federal University of Pernambuco

[email protected] ◈ twitter.com/pauloborba