SOA

Service Oriented Architecture is an architectural pattern for implementing a system, using loosely coupled and interoperable software services.

SOA can be implemented using REST, RPC, DCOM, CORBA and WebServices.

Cons:

• XML is used widely, which involves parsing. This might affect performance.
• Services are by default stateless. Difficult to implement Stateful services.
• WS- Transaction and Security are evolving.