SOA and Cloud Computing

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  On-demand self-service
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  Ubiquitous network access.
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  Location-independent resource pooling
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  Rapid elasticity
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  Pay per use

Example:
Electricity is a service provided by someone to you. you can take the service and pay as you use it. for example, in summer since we user AC, cooler and others the usage will be high and we pay extra amount for that usage. In winter, the usage will be less and we pay less bill. So this is not a fixed plan, its dynamic.
Similarly in Cloud computing, you’ll get the needed resources dynamically and you pay for only what you use.
Related to SOA?

Once your application has been deployed to the information system it needs to be managed along with the IT infrastructure on which it is hosted.

IT service management represents the set of management tools used to monitor your service flows, the health of the underlying system, the utilization of resources, the identification of outages and bottlenecks, the attainment of service goals, the enforcement of administrative policies, and recovery from failures.

We can capture the business design as a model, and use that to assemble the application services that implement that design, we can capture a correlation between the business and the IT system.

This correlation in deployment environment can be used by IT service management services to help prioritize the resolution of problems that surface in the information system, or to direct the allocation of execution capacity to different parts of the system based on service-level goals that have been set against the business design.

IBM Products: Websphere business Monitor and ITCAM

These services primarily represent the tools and the metadata structures for encoding your business design, including your business policies and objectives.

Business innovation and optimization is achieved by capturing your business design and then introspecting on that design to improve it through a combination of iterative refinement and analysis of real-time business metrics.

Business innovation and optimization services exist in the architecture to help you capture, encode, analyze and iteratively refine your business design.

The services include tools to help you simulate your business design and to use those results to predict the effect that design, or changes to that design, will have on your business. Also include tools to help you define your key performance indicators, that you want to monitor.

IBM products: Websphere Business Modeler and Business Monitor

• Enterprise service bus (ESB) provides fundamental services for complex architectures via an event-driven and standards-based messaging-engine.
• ESB provides an abstraction layer on top of an implementation of an enterprise messaging system, which allows integration architects to exploit the value of messaging without writing code.
• Its presence in the architecture is transparent to the services of your SOA application.

• ESB is the heart of SOA infrastructure.
• Through ESB all the services will interact with each others.
• ESB/Broker is capable of understanding the content of each message that it moves through the Broker.
• Customers can define the set of operations on each message depending on its content.

• Partner services capture the semantics of partner interoperability that have a direct representation in the business design.
• For example, include the policies and constraints that other businesses must conform to work with your business – including business requirements such as the need to conform to specific industry message and interchange standards like EDIFACT, SWIFT, RosettaNet, etc.
• It can involve the business logic of managing how partners are selected, and which ones are used as a preference over others in particular circumstances.

In simple words,:
◦partner services will project a view of your business to your partners, and controlling the interaction with them as an external entity.
◦Partner services will render the capabilities of that partner as a service so that those functions can be composed into your business processes like any other service.
IBM Offering: Websphere partner Gateway

• Access services are dedicated to integrating legacy applications and functions into the service-oriented architecture.  This includes simple wrapping of those functions and rendering them as services, or in more complex cases augmenting the logic of the existing function to better meet the needs of the business design.
• In some cases these are referred as Adapters
• In the SOA Foundation architecture, access services are distinctly responsible for rendering these adapters as services so that they can be manipulated and composed within business processes like any other service component.

Information services contain the data logic of your business design. Information services provide access to the persistent data of your business.

 

For example: query statements for retrieving the information you care about or referential integrity checks on the information manipulated by these services.

 

These data services are available to the business application as services. Information services at this level incorporates the idea of federating multiple data sources – projecting logical views over those multiple sources to render a simpler access pattern for the service composition that needs it. This is intended to handle two important requirements within the information management space – data composition, and data flow.

 

IBM offering for this layer : Websphere Information server