lecture 10 rails projects topics saassaas readings: saas book ch 2, 4 february 24, 2014 csce 740...

Lecture 10Rails Projects

Lecture 10Rails Projects

Topics Topics

• SaaSSaaS

Readings: Readings: SaaS book Ch 2, 4SaaS book Ch 2, 4

February 24, 2014

CSCE 740 Software Engineering

– 2 – CSCE 740 Spring 2014

SaaS round 2 - SaaS round 2 -

Last TimeLast Time

RAILSRAILS

Fig 2.1 100,000 viewFig 2.1 100,000 view

Client-serverClient-server

HTTP & URIsHTTP & URIs

HTML & CSSHTML & CSS

HAMLHAML

Finish-up Last Lecture SlidesFinish-up Last Lecture Slides

Slides ???Slides ???

New New

Summary of RailsSummary of Rails

HAMLHAML

CucumberCucumber

CapybaraCapybara

Next Time:Next Time:

– 3 – CSCE 740 Spring 2014

Rails Summary from Last timeRails Summary from Last time

9.9. The MVC ArchitectureThe MVC Architecture

10.10. Components of RailsComponents of Rails

11.11. RESTREST

12.12. a New Rails Projecta New Rails Project

13.13. Rails Application DirRails Application Dir

14.14. Rails Appl Directory IIRails Appl Directory II

15.15. Directory: appDirectory: app

16.16. HAML - lightweightHAML - lightweight

17.17. YAML-YAML-human-readable data serialization formatformat

18.18. Configuring a DBConfiguring a DB

19.19. Creating a DBCreating a DB

20.20. Starting WebrickStarting Webrick

21.21. rails generaterails generate

22.22. Setting the Application Setting the Application Home PageHome Page

23.23. Rails ScaffoldingRails Scaffolding

28.28. What’s Next?What’s Next?

29.29. Rails SummaryRails Summary

30.30. Active Record Active Record

31.31. … … CS 169 Saasbook: Fox and Patterson

– 4 – CSCE 740 Spring 2014

Chapter 2 SaaS Architecture ReviewChapter 2 SaaS Architecture Review

Saasbook Fox, Armando; Patterson, David (2014-01-31).

– 5 – CSCE 740 Spring 2014

Review Fig 2.3 – URI + HTTPmethodReview Fig 2.3 – URI + HTTPmethod


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Fig 2.4 50,000 ft viewFig 2.4 50,000 ft view

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Fig 2.6 Refining Steps 2 and 3Fig 2.6 Refining Steps 2 and 3


– 8 – CSCE 740 Spring 2014

LampLamp

Early SaaS sites were created using the Perl and Early SaaS sites were created using the Perl and PHP scripting languages, whose PHP scripting languages, whose

availability coincided with the early success of availability coincided with the early success of Linux, an open-source operating system, and Linux, an open-source operating system, and MySQL, an open-source database. MySQL, an open-source database.

Thousands of sites are still powered by the LAMP Thousands of sites are still powered by the LAMP Stack—Linux, Apache, MySQL, and PHP or Perl.Stack—Linux, Apache, MySQL, and PHP or Perl.


– 9 – CSCE 740 Spring 2014

ScalabilityScalability


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Fig 2.8 5,000 ft view Refining MiddlewareFig 2.8 5,000 ft view Refining Middleware

– 11 – CSCE 740 Spring 2014

Architectures for Web AppsArchitectures for Web Apps

Left - page controller SinatraLeft - page controller Sinatra

Center top – front controller J2EE servletsCenter top – front controller J2EE servlets

Center bottom – PHPCenter bottom – PHP

Right – MVC used by railsRight – MVC used by railsSaasbook Fox, Armando; Patterson, David (2014-01-31).

– 12 – CSCE 740 Spring 2014

Fig 2.10 – 5,000 ft viewFig 2.10 – 5,000 ft view


– 13 – CSCE 740 Spring 2014

2.6 500 Feet: Active Record for Models2.6 500 Feet: Active Record for Models

Active Record architectural patternActive Record architectural pattern

a single instance of a model class (in our case, the a single instance of a model class (in our case, the entry for a single movie) corresponds to a single row entry for a single movie) corresponds to a single row in a specific tablein a specific table


– 14 – CSCE 740 Spring 2014

CRUDCRUD

CCreate a new row in the table (representing a new reate a new row in the table (representing a new object), object),

RRead an existing row into a single object instance, ead an existing row into a single object instance,

UUpdate an existing row with new attribute values pdate an existing row with new attribute values from a modified object instance, from a modified object instance,

DDelete a row (destroying the object’s data forever).elete a row (destroying the object’s data forever).


– 15 – CSCE 740 Spring 2014

2.7 500 Feet: Routes, Controllers, and REST2.7 500 Feet: Routes, Controllers, and REST

REST - In 2000, Roy Fielding proposed, in his Ph.D. REST - In 2000, Roy Fielding proposed, in his Ph.D. dissertation, a consistent way to map requests to dissertation, a consistent way to map requests to actions that is particularly well suited to a service-actions that is particularly well suited to a service-oriented architecture.oriented architecture.

identify the various entities manipulated by a Web app identify the various entities manipulated by a Web app as resources, and as resources, and

design the routes so that any HTTP request would design the routes so that any HTTP request would contain all the information necessary to identify both a contain all the information necessary to identify both a particular resource and the action to be performed on particular resource and the action to be performed on it.it.

In Rails, the route mappings are generated by code in In Rails, the route mappings are generated by code in the file config/routes.rb,the file config/routes.rb,


– 16 – CSCE 740 Spring 2014

Fig 2.12 Rake Routes SummaryFig 2.12 Rake Routes Summary

Operation Operation Method & URI Method & URI action action

Index (list) movies Index (list) movies GET /moviesGET /movies index index

Read (show) movie Read (show) movie GET /movies/:id GET /movies/:id showshow

Display fill-in form Display fill-in form GET /movies/new GET /movies/new newnew

Create from filled-in form POST /moviesCreate from filled-in form POST /movies create create

Display form to edit Display form to edit GET /movies/:id/editGET /movies/:id/edit editedit

Update movie Update movie PUT /movies/:id PUT /movies/:id update update

Destroy movie Destroy movie DELETE /movies/:id DELETE /movies/:id destroydestroy


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Fig 2.13 Restful vs nonRestfulFig 2.13 Restful vs nonRestful

Login to site Login to site

• Non-RESTful site - POST /login/dave Non-RESTful site - POST /login/dave

• URI RESTful site - POST /login/dave URI RESTful site - POST /login/dave

Welcome page Welcome page

• Non-RESTful Non-RESTful - GET /welcome - GET /welcome

• URI RESTful URI RESTful - GET /user/301/welcome - GET /user/301/welcome

Add item ID 427 to cart Add item ID 427 to cart

• Non-RESTful Non-RESTful - POST /add/427 - POST /add/427

• URI RESTful URI RESTful - POST /user/301/add/427- POST /user/301/add/427


– 18 – CSCE 740 Spring 2014

View cartView cart

• Non-RESTful Non-RESTful - GET / cart - GET / cart

• URI RESTful URI RESTful - GET /user/301/cart - GET /user/301/cart

CheckoutCheckout

• Non-RESTful Non-RESTful - POST /checkout - POST /checkout

• URI RESTful URI RESTful - POST /user/301/checkout- POST /user/301/checkout


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ELABORATION: REST vs. SOAP vs. WS-*ELABORATION: REST vs. SOAP vs. WS-*SOA standards bodies created committees to develop SOA standards bodies created committees to develop

standards for SOA interoperation.standards for SOA interoperation.

One approach resulted in a collection of elaborate One approach resulted in a collection of elaborate protocols for Web Services including WS-Discovery, protocols for Web Services including WS-Discovery, WS-Description, and others, sometimes collectively WS-Description, and others, sometimes collectively called WS-* and jokingly called “WS-Deathstar” by called WS-* and jokingly called “WS-Deathstar” by David Heinemeier Hansson, the creator of Rails. David Heinemeier Hansson, the creator of Rails.

The competing SOAP standard (Simple Object Access The competing SOAP standard (Simple Object Access Protocol) was a bit simpler but still far more complex Protocol) was a bit simpler but still far more complex than REST. By and large, practicing developers than REST. By and large, practicing developers perceived SOAP and WS-* as overdesigned perceived SOAP and WS-* as overdesigned committee-driven standards burdened by the archaic committee-driven standards burdened by the archaic design stancedesign stance


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Fig 2.14 500 ft – Template views HAMLFig 2.14 500 ft – Template views HAMLHaml Haml HTML HTML

%br{:clear => ’left’} %br{:clear => ’left’} <br clear=”left”/> <br clear=”left”/>

%p.foo Hello %p.foo Hello <p class=”foo”>Hello</p> <p class=”foo”>Hello</p>

%p#foo Hello %p#foo Hello <p id=”foo”>Hello</p><p id=”foo”>Hello</p>

.foo .foo <div class=”foo”>. . . </div> <div class=”foo”>. . . </div>

#foo.bar #foo.bar <div id=”foo” class=”bar”>. . . </div><div id=”foo” class=”bar”>. . . </div>


lecture 10 rails projects topics saassaas readings: saas book ch 2, 4 february 24, 2014 csce 740...

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