1. Service Oriented Application Integration (SOAI) IT 490 NJIT

2. SOAI Basics SOAI allows sharing of application services as well as information The major benefit of SOAI is reusability. Since services are shared across the enterprise, then need for redundancy in individual servers is reduced What constitutes an application service, and how does it differ from BPOIAI?

3. SOAI Basics Any method/procedure performed by a system that is part of the enterprise may be a candidate for use as an application service. Examples include (but are not limited to): Tax rate computation Risk analysis Inventory control The big difference between SOAI and BPIOAI is that SOAI usually requires an application rewrite and could be SIGNIFICANTLY more expensive

4. SOAI Basics Additionally, user access to the services provided by integration is usually through a composite application (figure 4.1) Web services are a leveraging technology that enables SOAI Application frameworks such as.NET as well as object oriented middleware frameworks like CORBA are necessary for successful SOAI, but no single standard is required

5. When to Use SOAI? Two or more companies share common programming logic (calculation of shipping costs, etc) Two or more companies wish to develop together and split the costs associated with the project Small projects that share a common domain and collaborate on a common application that all the participants share

6. SOAI Techniques Rebuilding existing applications is a requirement of SOAI. Two approaches are possible: Move the business logic from the individual systems over to a shared server Rebuild all the applications using a distributed service framework like CORBA. Either method will require a large amount of time/effort/resources

7. Web Services Web Services Description Language (WSDL) provides a standard to allow developers to advertise available web services using XML grammar The WSDL definition of a service serves as an instruction list for automating how services may communicate across platforms In WSDL, services are simply collections of network endpoints at the system end and the definition of the endpoint at the network end

8. Web Services Applications that wish to share these services simply connect to this abstract endpoint. Discovery of web services is managed through Universal Description, Discovery and Integration (UDDI) which is an XML based registry that allows users to discover and invoke web services Requests for services are made using the Simple Object Access Protocol (SOAP)

9. Web Services Some typical signs that implementing web services might be useful in the problem domain include: Redundant application servers New applications needs that leverage the abilities of multiple systems Information value decreases significantly when decoupled from services that support that data

10. Web Services Web service based integrations fall into varying models: Event – driven Composite Autonomous – distributed Examples

11. Service Frameworks Service frameworks allow a common approach to creation and deployment of cross utilized objects While the two most common are CORBA and COM, other development frameworks exist, such as: Powerbuilder Delphi Smalltalk