Cloud Computing Software as a service, this chapter will give idea about SaaS, Web services, Web 2.0

1. Chapter 5
SaaS
Software as a Service
By Prof. Raj Sarode

2. Introduction to SaaS
• SaaS:
– Software as a service (SaaS) is a software distribution model in which
a third-party provider hosts applications and makes them available
to customers over the Internet.
 Software as a service (SaaS) is a way of delivering applications over the
Internet—as a service.
 Instead of installing and maintaining software, you simply access it via the
Internet, freeing yourself from complex software and hardware
management.
 SaaS applications are sometimes called Web-based software, on-demand
software, or hosted software.
 Whatever the name, SaaS applications run on a SaaS provider’s servers.
The provider manages access to the application, including security,
availability, and performance.
By Prof. Raj Sarode 2

3. Characteristics of Software as a Service
 Configurability : Each site's administration interface has variable
configuration options including: network content access, simplified blog
interface, social media extensions, and custom tool modules. These can be
turned on or off on a per site basis with minimal effort and time.
 Multi-tenant Efficiency: A multitenant architecture, in which all users and
applications share a single, common infrastructure and code base that is
centrally maintained.
 Scalability: Plat formic employs a multi-tier architecture that implements
a load balancer. System capacity can be adjusted by adding servers to
match demand without having to modify the software architecture.
 Enhanced Security: It is typically more secure than traditional systems.
 Saving Costs: The monthly or annual subscription fees paid by companies
for using SaaS apps are much easier to budget for. SaaS systems often
come with the flexibility to change or cancel the subscription.
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Continued..

4. Characteristics of Software as a Service
 Easy To Use: SaaS apps can be accessed through the Internet and a
number of mobile devices. The quality and consistency of user interfaces
have also greatly improved in the past few years, and the adoptability
learning curve is low.
 Better Access: Improved access to data from any networked device while
making it easier to manage privileges, monitor data use, and ensure
everyone sees the same information at the same time.
 Easy Customization: The ability for each user to easily customize
applications to fit their business processes without affecting the common
infrastructure. Because of the way SaaS is architected, these
customizations are unique to each company or user and are always
preserved through upgrades. Means SaaS providers can make upgrades
more often, with less customer risk and much lower adoption cost.
 Automatic updates: Rather than purchasing new software, customers can
rely on a SaaS provider to automatically perform updates and patch
management. This further reduces the burden on in-house IT staff.
By Prof. Raj Sarode 4

5. Web Services
• Web services are open standard (XML, SOAP, HTTP etc.) based Web
applications that interact with other web applications for the purpose of
exchanging data.
• Web Services can convert your existing applications into Web-applications.
• A web service is any piece of software that makes itself available over the
internet and uses a standardized XML messaging system.
• Web services are XML-based information exchange systems that use the
Internet for direct application-to-application interaction. These systems
can include programs, objects, messages, or documents.
• A web service is a collection of open protocols and standards used for
exchanging data between applications or systems.
By Prof. Raj Sarode 5

6. Web Services
• To summarize, a complete web service is:
• Is available over the Internet or private (intranet) networks
• Uses a standardized XML messaging system
• Is not tied to any one operating system or programming language
• Is self-describing via a common XML grammar
• Is discoverable via a simple find mechanism
• The basic standards for web services are:
• XML (Extensible Markup Language)
• SOAP (simple object access protocol)
• WSDL (web services description language)
• UDDI (universal description, discovery and integration)
By Prof. Raj Sarode 6

7. Why Web Services?
• Exposing the Existing Function on the network: It is a unit of managed code that can
be remotely invoked using HTTP. It can be activated using HTTP requests. Web
services allows you to expose the functionality of your existing code over the
network. Once it is exposed on the network, other application can use the
functionality of your program.
• Interoperability: It allow various applications to talk to each other and share data &
services among themselves. Other applications can also use the web services. E.g.- a
VB or .NET application can talk to Java web services and vice versa. Web services are
used to make the application platform and technology independent.
• Standardized Protocol: It use standardized industry standard protocol for the
communication. All the four layers (Service Transport, XML Messaging, Service
Description, and Service Discovery layers) use well-defined protocols in the web
services protocol stack. This standardization of protocol stack gives the business
many advantages such as a wide range of choices, reduction in the cost due to
competition, and increase in the quality.
• Low Cost of Communication: It use SOAP over HTTP protocol, so you can use your
existing low-cost internet for implementing web services. This solution is much less
costly compared to proprietary solutions like EDI/B2B. Besides SOAP over HTTP, web
services can also be implemented on other reliable transport mechanisms like FTP.
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8. Web Services - Characteristics
• XML-Based
• Loosely Coupled
• Coarse-Grained
• Ability to be Synchronous or Asynchronous
• Supports Remote Procedure Calls(RPCs)
• Supports Document Exchange
By Prof. Raj Sarode 8

9. Web Services Architecture
• Web Service Roles
There are three major roles within the web service architecture:
• Service Provider
This is the provider of the web service. The service provider implements
the service and makes it available on the Internet.
• Service Requestor (Customer)
This is any consumer of the web service. The requestor utilizes an existing
web service by opening a network connection and sending an XML
request.
• Service Registry
This is a logically centralized directory of services. The registry provides a
central place where developers can publish new services or find existing
ones. It therefore serves as a centralized clearing house for companies
and their services.
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10. Web Services Architecture
By Prof. Raj Sarode 10

11. Web 2.0
By Prof. Raj Sarode 11
• “Web 2.0 is the business revolution in the computer industry caused by the
move to the internet as a platform, and an attempt to understand the rules
for success on that new platform.”– Tim O’ Reilly.
• It’s a simply improved version of the first world wide web, characterized
specifically by the change from static to dynamic or user-generated content
and also the growth of social media.
• Web 2.0 is the term given to describe a second generation of the World Wide
Web that is focused on the ability for people to collaborate and share
information online.
• Web 2.0 basically refers to the transition from static HTML Web pages to a
more dynamic Web that is more organized and is based on serving Web
applications to users.
• Other improved functionality of Web 2.0 includes open communication with
an emphasis on Web-based communities of users, and more open sharing of
information.
• Over time Web 2.0 has been used more as a marketing term than a computer-
science-based term.
• Blogs, wikis, and Web services are all seen as components of Web 2.0.

12. Advantages of Web 2.0:
• Available at any time, any place.
• Variety of media.
• Ease of usage.
• Learners can actively be involved in knowledge building.
• Can create dynamic learning communities.
• Everybody is the author and the editor, every edit that has been made can
be tracked.
• User friendly.
• Updates in wiki are immediate and it offers more sources for researchers.
• Provides real-time discussion.
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13. By Prof. Raj Sarode 13

14. Thank You
By Prof. Raj Sarode 14