Fundamentals of Web Development For Non-Developers

High level overview of concepts
Lemİ Orhan Ergİn
Principal software Engineer @ Sony
guide for non-developers
Fundamentals of
web development

The aim of this training is to let you
•Know some advanced concepts of web and web development
•Understand how people develop web based software
•Understand the technical discussions better
•And answer your questions...
For introductory information about web concepts, please check
the slides of “Fundamentals of Web for Non-Developers”.

agenda
•Web Development Concepts
Web Applications, Web Services, Url Rewriting, Development/Deployment

Web Applicationsand the evolution of web sites to web applications

Static web pages ruled the
world. We loved them and
let DotCom bubble blow.
Evolution of web
Static web pages

Interactive web sites let the
users communicate with
the sites by entering content
Evolution of web
Interactive web sites

Reactive web applications both interact
with the user and adapt itself by the
needs of resolution and screen size
Reactive web sites
applications
Evolution of web

Web APplications
A web application is an application that is accessed by users over a network such
as the internet or an intranet. It could be web sites, messaging platforms, search
engines, web services, etc.
•Presentation Oriented
•Service Oriented
•Client Side
•Server Side
There exists similar but two types of deﬁning web application types

Controller Business Data Access
Presentation
request
Response
http://www.sony.co.uk
For web pages, content is
visualized by images,
styles and scripts
Data Sources
Accepts all the requests
and user inputs
Content is prepared by
running some business logic.
All logic are coded by
programming languages.
Knows how to access
data from data sources
Databases, ﬁles, remote
data services, other
components could be
your datasource
Web APplications
Requests contain a uri,
headers and a message body
Responses are the content to be
rendered by browsers

Controller Business Data Access
Presentation
request
Response
http://www.sony.co.uk
Data Sources
Web APplications
Designers, UX teams, Front-end
developers prepare the
presentation of web applications
Developers code and
develop software
Business Analysts
gather requirements
and deﬁne open points
Testers check if the requirements
are developed as business requests
Customers check if
what they requested is
implemented properly

Web Servicesor simply saying, the web components serving data to the requesters
Web Services
RESTful Web Services
Simple Object Access Protocol (SOAP)
Service Oriented Architecture (SOA)

web services
Web services are services for doing speciﬁc functionalities that are made available
from a business's Web server for Web users or other Web-connected programs.
1. REST-Compliant Web services, in which the primary purpose of the service is to manipulate
XML representations of Web resources using a uniform set of "stateless" operations
2. Arbitrary Web services, in which the service may expose an arbitrary set of operations

To design a website you need to know about HTTP, XHTML, and URIs.
A uniform resource identifier (URI) is a string of
characters used to identify a name or a web resource,
such as a web page or special set of data (like product
data or user information). “/product/45242366” is a URI
identifying a specific product.
web services
XHTML could be defined as HTML in valid XML structure.

To design a web application you need to know about HTTP, XHTML, and URIs.
web services

To design a web service you need to know about XML, SOAP, WSDL, UDDI, WS-
Policy, WS-Security, WS-Eventing, WS-Reliability, WS-Coordination, WS-
Transaction, WS-Notiﬁcation, WS-BaseNotiﬁcation, WS-Topics, WS-Transfer...
What?...
web services

WEB
It is most successful distributed
platform in the world
it's simple enough for average
humans to understand
Why not using HTTP and URIs
for web services?

REST
Representational State Transfer (REST) is a style
of software architecture for distributed systems
such as the World Wide Web
Client-Server
Stateless
Cacheable
Layered System
Uniform Interface
Services and applications conforming
these constraints are “RESTful”

Restful web services
GET /product/12
12
9
4
3
7 6
POST /product/4 with “data”
data
Create
datad
PUT /product/3 with “data” Update
data
DELETE /product/7
Delete
Retrieve
RESTful Web Services use HTTP methods explicitly, do not store any state, expose directory structure-like
URIs and transfer data in XML, XHTML, JSON format

soap
Simple Object Access Protocol (SOAP) is a protocol speciﬁcation for exchanging
structured information in the implementation of Web Services in computer
networks. It relies on XML Information Set for its message format, and usually
relies on other Application Layer protocols, most notably Hypertext Transfer
Protocol (HTTP) or Simple Mail Transfer Protocol (SMTP), for message
negotiation and transmission.

Service oriented architecture
SOA is a software design and architecture based on having independent modules
communicating between each other through services to build monitorable,
scalable, reusable, stateless, loosely coupled components and platforms.

Jeff Bezos
1. All teams will expose their data and functionality through service interfaces.
2. Teams must communicate with each other through these interfaces.
3. There will be no other form of interprocess communication allowed.
4. It doesn’t matter what technology they use.
5. All service interfaces, without exception, must be designed from the
ground up to be externalizable. No exceptions.
6. Anyone who doesn’t do this will be ﬁred.
7. Thank you, have a nice day!
Founder and CEO of Amazon
Jeff Bezos sent an email to his colleagues having these words:
https://plus.google.com/112678702228711889851/posts/eVeouesvaVX

URL RewritingWhat you call is not what you really call

URL rewriting
With URL rewriting, the URL and the resource that it leads to can be completely
independent of each other. In practice, they’re usually not wholly independent: the
URL usually contains some code or number or name that enables the application to
look up the resource. But in theory, this is what URL rewriting provides: a complete
separation.
URL rewriting basically tells the Web server that the called url should show the Web
page at an internal url without the customer or search engine knowing about it.
/products/miniflow-gutter-brown/11577676
/diy/jsp/bq/nav.jsp?action=detail&fh_secondid=11577676

URL rewriting
User Web Server Application Server
is called by the user. Web Server gets the
request, runs ReWrite Rules and convert
the url into a different one.
/diy/jsp/bq/nav.jsp?action=detail&fh_secondid=11577676
is received by the application server.
Request is processed and a response is
generated and sent.
is the url that the user sees the response.
Even though URL has changed internally,
the user is not aware of it.

How do developers
develop software?* The way of development differs from company to company and team to team for sure. But
here, we try to focus on enterprise level projects which are developed by teams. You may
encounter different styles in other companies as well.
*

Notification Services (email, messaging)
Super User
DEV TEST & QA STAGING PROD
Version
Control
System
Developer Developer Developer
LOCAL
Developer
Continous
Integration
Repository Manager
At the very beginning, developers
develop software by their own. No
collaboration. That might be ﬁne for
some circumstances but it is
unacceptable in an enterprise.
Continuous
Delivery

Super User
Version
Control
System
LOCAL
Developer
Continous
Integration
Repository Manager
Developers
We build cross functional teams
that the members collaborate
and develop as teams.
Continuous
Delivery

Super User
Version
Control
System
LOCAL
Developer
Continous
Integration
Repository Manager
Developers
Developers push code to a
central version system. That
helps developers work on same
code at the same time.
Continuous
Delivery

Super User
Version
Control
System
Continuous
Delivery
LOCAL
Developer
Continuous
Integration
Repository Manager
Developers
Automated tests are written by
developers. Continuous integration
server builds all tests to get
immediate feedback. Whenever a test
fails, developers get notiﬁed by
notiﬁcation mails or messages.

Super User
Version
Control
System
Continuous
Delivery
LOCAL
Developer
Continuous
Integration
Repository Manager
Developers
CI server deploys snapshots to a
centralized repository manager if all
the tests pass. All packages including
3rd party packages are managed by the
repository manager.

Super User
Version
Control
System
Continuous
Delivery
LOCAL
Developer
Continuous
Integration
Repository Manager
Developers
Now it’s time to deploy our code to servers
and make it run. You could have several
enterprise environments to deploy and run
software for special purposes
Your code is in repository manager as a package if
packages are deployed as in Java based applications.
Your code is in version control system and could be
deployed to servers in text form like in Ruby and PHP.

Super User
Version
Control
System
Continuous
Delivery
LOCAL
Developer
Continuous
Integration
Repository Manager
Developers
Developers develop software, run
and test in their local machines

Super User
Version
Control
System
Continuous
Delivery
LOCAL
Developer
Continuous
Integration
Repository Manager
Developers
Developers test their software in a
separate environment before
sending to Quality Assurance team

Super User
Version
Control
System
Continuous
Delivery
LOCAL
Developer
Continuous
Integration
Repository Manager
Developers
Test/QA machines should be similar to
production machines in means of hardware
to make tests more reliable. There might be
more than one test environment for testing
different features.

Super User
Version
Control
System
Continuous
Delivery
LOCAL
Developer
Continuous
Integration
Repository Manager
Developers
Staging is the place where customers do UAT,
SIT and regression tests. The data is
previewed before being delivered to
production environment.

Super User
Version
Control
System
Continuous
Delivery
LOCAL
Developer
Continuous
Integration
Repository Manager
Developers
Only super users can deploy to
production. Production environment
is monitored continuously.

Super User
Version
Control
System
Continuous
Delivery
LOCAL
Developer
Continuous
Integration
Repository Manager
Developers
Too much manual effort for
deployment. That slows down the
whole testing and release process.
Let’s automate deployments!

Super User
Version
Control
System
Continuous
Delivery
LOCAL
Developer
Continuous
Integration
Repository Manager
Developers
Packages are deployed automatically by
a continuous delivery system to servers.
Most of the time, continuous integration
servers do the deployment.

Super User
Version
Control
System
Continuous
Delivery
LOCAL
Developer
Continuous
Integration
Repository Manager
Developers
It is also possible to deploy code directly
from version control system to servers.
For instance, whenever developers push a
code to version control system, the code
could be deployed to development servers.

DevOps
Version
Control
System
Continuous
Delivery
DevOps DevOps DevOps
LOCAL
DevOps
Continuous
Integration
Repository Manager
Developers
You don't need servers to maintain,
you need just a cloud. DevOps are the
ones who manages both infrastructural
and development requirements.
Version
Control
System
This ﬂow is the one we use for Heroku (i.e. cloud
platform as a service) for deploying and running
the software. Please note that each cloud solution
has its own way of deploying software.

References
RESTful Web Services
http://www.crummy.com/writing/RESTful-Web-Services/
http://www.ibm.com/developerworks/webservices/library/ws-restful/
Web Services
http://searchsoa.techtarget.com/deﬁnition/Web-services
Url ReWriting
http://coding.smashingmagazine.com/2011/11/02/introduction-to-url-rewriting/

Lemİ orhan ergİn
lemiorhan@agilistanbul.com
@lemiorhan
@lemiorhan
agilistanbul.com
@lemiorhan
LINKEDINTWITTERSLIDESHAREBLOGGER
Principal Software Engineer @ Sony
Founder & Author @ agilistanbul.com
ﬂyingtomoon.com

Fundamentals of Web Development For Non-Developers

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