Service-Oriented Application Integration
Service-Oriented Application Integration Enterprises share common application services and information Define application services they can share Provide infrastructure for application service sharing Examples: Sharing common logic to process customers’ credit Calculate shipping costs
Service-Oriented Application Integration Built on multitier client/server architecture Set of shared services on a common server Services may be reused Originally created for a single-organization use Allows for loosely coupled applications
Service-Oriented Application Integration Requires changes to most enterprise and B2B applications to take advantage Expensive proposition Concern about creating applications that share services not under direct control
Service-Oriented Application Integration Web Services Ability to access remote application services through a well-defined interface, directory, and transport protocol Web Services Description Language (WSDL) Universal Description, Discovery and Integration (UDDI) Simple Object Access Protocol (SOAP)
Web Services Description Language (WSDL) Provides a standard on interfaces between client and server Defines an XML grammar to describe network services Recipe to automate the way applications communicate
Universal Description, Discovery and Integration (UDDI) Set of databases where businesses register their Web services Allows other organizations to find Web service Understand how to access service programmatically Understand the interfaces employed
Web Services Locate the service using UDDI Determine the interface definition using WSDL Application services exposed by a company that are discoverable and accessible by other organizations Example: reserving a flight, calculating tariffs Discrete business services Value to many organizations
Web Services Web services tend to be created in a series of small, low risk steps Combine information and applications that exist in local and remote information systems Redundant application services at two or more systems New application need
Web Services Event-driven Web Services – architecture that deals more with information movement than application service aggregation EX: moving order information from system to system and company to company to support purchase of a car
Web Services Composite-application Solutions – architecture that requires many application services to aggregate into a single instance of an application
Web Services Autonomous-distributed Solutions – architectures where Web services are tightly coupled, appear as a single application Very future architecture
Web Services Missing Pieces No mechanism to leverage user interfaces Lack support for authentication, encryption and access control Lack ability to authenticate publishers or consumers of services
Application Integration Rule Agreed-upon set of conditions Example: employees may not fly first class on flights of less than 5,000 miles Rules are built into applications to control information flow Rules can control the flow of information between enterprises
Application Integration Logic Sequence of instructions in a program Example: when button is pressed, pop up this screen Logic tends to be generated differently by different programmers, i.e., form of art Sequential processing Selection Iteration
Application Integration Data Information that is shared between applications, computers, or humans Objects Data and business services bound as objects
Amazon.com Books? CD’s Technology Company?
Amazon.com Amazon Web Services Patented one-click purchasing system Tap quickly into sales data for particular products Merchants & developers can get free access to services Can use services from any outpost on the Web
Amazon.com May sell wares to 37 million customers assembled at Amazon.com Amazon takes a commission of 15% Is Amazon an on-line mall? Some of the retailers that use its e- commerce system Lands’ End Circuit City Store Target Corp Toys ‘R’ Us