Cloud Computing - SAAS

AGENDA

WHAT IS SAAS?

WHO ARE THE ‘OTHERS’?

WITH A DEMO

EVOLUTION OF SAAS

What is SAAS?

”

“ Software as a service (SaaS; pronounced /sæs/ or /sɑːs/) is a software licensing and delivery

model in which software is licensed on a

subscription basis and is centrally hosted. It is

sometimes referred to as "on-demand

software". SaaS is typically accessed by users

using a thin client via a web browser.

E-MAIL COMMUNICATION

STORAGE

VIRTUAL OFFICE

ON-PREMISE VS SAAS

ON PREMISE VS. SAAS

Advantages of SAAS

• Lower cost of entry

• Reduced time to benefit/rapid prototyping

• Pay as you go

• The SaaS vendor is responsible for upgrades, uptime and security

• Higher adoption rates

• Integration and scalability

• Work anywhere

ASP VS SAAS

”

“ An Application Service Provider (ASP) is a

business providing computer-

based services to customers over a

network; such as access to a particular

software application (such as customer

relationship management) using a

standard protocol (such as HTTP)

ASP Vs. SAAs

• Procures app and

resells service

• Single-Instance,

Single-Tenant

Legacy Software

application.

• lacks scalability

• Examples

BMC AAS

• Hosted by

software

publisher

• Many

customers to

one

application set

• shared

resources and

shared

infrastructure,

• Scalable

Examples

Salesforce.com

SOA VS SAAS

WHAT IS SOA?

SOA vs SAAS

SOA VS SAAS

UTILITY VS CLOUD

”

“ Utility computing relates to the business model

in which application infrastructure resources —

hardware and/or software — are delivered.

While cloud computing relates to the way we

design, build, deploy and run applications that

operate in an a virtualized environment, sharing

resources and boasting the ability to

dynamically grow, shrink and self-heal.

SINGLE VS. MULTI-TENANT

MULTI-TENANCY SIMPLIFIED

SINGLE TENANT vs. MULTI-TENANT

EXTRAPOLATING THE CONCEPT

SAAS SOLUTION PROVIDER DELIVERY CHAIN

1. Creating your app

The app is the product that you are going to sell. If you already have this app ready, you will only have to modify it so that it is compatible for multiple clients. The app is the front-end for your client’s end-users.

SAAS architecture

CODE- SHARED ACROSS CLIENT/CUSTOMERS

DATA- SHARED ACROSS CLIENTS’ END USERS

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SITE STRUCTURE

www.mydummyapp.com:

SaaS site (where the client

registers)

*.mydummyapp.com:

SaaS app (catch-all

points to the actual app)

OPTIONS

Option 1 – Single database, single code-base

Advantages: Easy to

manage database &

updates; no duplication.

Disadvantages: If you miss

out a “clientid” in the SQL

query, it may result in issues

with another client.

Multiple database, multiple code-base

Advantages: Very little

codebase modification,

easy to ensure client data

does not get mixed.

Disadvantages: Multiple

databases to manage so in

the event of DB schema

updates, you will have to

update each and every

database.

Advantages: No codebase modification, easy to ensure client data does not get mixed, easy to perform client specific modifications. Disadvantages: Multiple databases/code to manage so in the event of DB schema/code updates, you will have to manually update for each client.

Option 2 – Multiple database, single code-base

2. Creating your SaaS site

The site is the front-end for your clients. They will be using your site to signup for the app.

The client visits www.mydummyapp.com

The client registers on the site

The site creates the a DB (and user) for the client (and adds an entry in the site’s DB)

The client then uses the new URL (i.e. clientsubdomain.mydummyapp.com) for himself & his end-users

The end-users directly visit clientsubdomain.mydummyapp.com which is basically the app using the client’s DB

Workflow

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HELPFUL DOCUMENTATION

• http://www.ibm.com/cloud-computing/in/en/what-is-cloud-computing.html

• http://www.business2community.com/cloud-computing/top-5-examples-cloud-computing-

0973287

• http://www.salesforce.com/in/?ir=1

• http://service-architecture.static-barryandassociates.com/

• http://sixteenventures.com/difference-between-asp-and-saas

• http://anantgarg.com/2013/06/10/build-a-php-saas-app-from-scratch/