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Open SaaS and SOA

A considerable amount of SaaS software is based on open source software. 

When open source software is used in a SaaS,  it referred to as Open SaaS. 

The advantages of using open source software are that systems are much cheaper to deploy because you don’t have to purchase the operating system or software, there is less vendor lock-in, and applications are more portable. 

The popularity of open source software, from Linux to APACHE, MySQL, and Perl (the LAMP platform) on the Internet, and the number of people who are trained in open source software make Open SaaS an attractive proposition. 

The impact of Open SaaS will likely translate into better profitability for the companies that deploy open source software in the cloud, resulting in lower development costs and more robust solutions.


SOA (Service-Oriented Architecture):

SOA is an architectural approach for designing and developing software systems that are composed of loosely coupled services. 

In an SOA, the functionality of an application is divided into modular, independent services that communicate with each other through standardized interfaces. 

These services can be distributed across different systems and can be combined and reused to create flexible and scalable applications. SOA promotes service reusability, interoperability, and flexibility, allowing organizations to build complex systems by assembling and orchestrating services from various sources.

The componentized nature of SaaS solutions enables many of these solutions to support a feature called mashups. A mashup is an application that can display a Web page that shows data and supports

features from two or more sources. Annotating a map such as Google maps is an example of a mashup. Mashups are considered one of the premier examples of Web 2.0, and that is technology’s ability to support social network systems.


A mashup requires three separate components:

  • An interactive user interface, which is usually created with HTML/XHTML, Ajax, JavaScript, or CSS.
  • Web services that can be accessed using an API, and whose data can be bound and transported by Web service protocols such as SOAP, REST, XML/HTTP, XML/RPC, and JSON/RPC.
  • Data transfer in the form of XML, KML (Keyhole Markup Language), JSON (JavaScript Object Notation), or the like.

Mashups are an incredibly useful hybrid Web application, one that SaaS is a great enabler for. 

The Open Mashup Alliance (OMA; see http://www.openmashup.org/) is a non-profit industry group dedicated to supporting technologies that implement enterprise mashups. This group supports the developing standard, the Enterprise Mashup Markup Language (EMML), which is a Domain Specific Language (DSL). This group predicts that the use of mashups will grow by a factor of 10 within just a few years.

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