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Saturday, January 24, 2015

“Services” are components which expose well defined interfaces and these interfaces communicate through XML messages. Using SOA you can build workflow, which uses interfaces of these components. SOA is typically useful when you are crossing heterogeneous technical boundaries, organizations, domain etc.

In .NET SOA technically uses Web services to communicate with each service which is crossing boundaries. You can look SOA which sits on TOP of web services and provides a workflow.

SOA uses service components which operate in there own domain boundary. Let’s note some points of service :-
1. They are independent components and operate in there own boundary and own technology.

2. They have well defined interfaces which use XML and WSDL to describe themselves.

3. Services have URL where any one can find them and clients can bind to these URL to avail for the service.
4. Services have very loosely coupled architecture. In order to communicate to service you only have to know the WSDL. Your client can then generate proxy from the WSDL of the service.

SOA basic architecture

Above figure describes a broader picture of what service oriented architecture will look like. The basic fundamental of SOA is a web service. In above diagram you can see there are two services available. One is the “Credit Card” service and other is “Address Check” web service. Both these services are provided by different company. Now we want to build a functionality which needs to validate a credit card and also check that addresses are proper. In short we will need functionalities of both the “CreditCard” and “AddressCheck” service. Also note the “CreditCard” service has its own business layer and DAL components, which can be in a proprietary language. It’s very much possible that the whole Credit card service is made in .NET and the Address check is SAP implementation or JAVA implementation. But because both the systems provide there functionality using Web services which is nothing but basically XML message communication. So we have made new service which sits like a FAƇADE on top of both the web service and performs both functionalities in one common service. You will see I have made a third service which sits on top of both the webservice and consumes them.

Also you can see that the UI part of the systems have access to Buisness layer and Web service of there system. But the service which does both these check has only access to the Web service.



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