MD703 Class 8 DRAFT Agenda Midterm Return and Review –The Big Fix Discussion Application Integration –Workflow –EAI –Service Oriented Architecture Chapters 4, 10 Review

The Big Fix IT “Governance” –Projects Management –Projects Ownership –Projects Portfolio –Projects Environment Application Development Environment –Standard tools, functions –Common libraries, scheduling, Access control

Workflow: Transactions Definition: A single logical business event, that involves one or more technical events, that should not be subdivided. Rules –Atomic –Consistent inputs –Isolated –Durable Requirements –Availability of all inputs –Near simultaneous actions

Workflow: Process Definition: The logical linking of transactions and business processes to accomplish a complex business event: “the assembly line” Examples: Purchase Order Issues –Time –Multiple persons, servers, locations –Notification of status –Options, sequence, parallel steps –Non-technical steps

Workflow Goals Identification Process definition Process “stability” Routing Triggering Status availability Parallel processing Performance metrics

Service Oriented Architecture Purpose –Modular Structure Web services are the components Accessed via or http using XML –Reusable Logic –Dynamic linking of functions w/o hierarchy Aspects –Std for defining the service (WSDL) –Std for invoking the service (SOAP) –Web Services Registry (UDDI) –Std for presenting data (XML)

SOA: Problems Solved JAVA issues –“Write once, use often” –“Context” –Location of service fixed Strategic Development –Components can be built w/o hierarchy –Possible multiple service providers –Applications are built by dynamic linking of the services –Linking to external services no harder, just a different URL and XML format

SOA: “Lines and Circles” Typical development model –Hierarchy of functions –Context of processes SOA makes linkage very inexpensive –“Liquid Computing” –“Write once, deploy once”

SOA: Opportunities SCM or “Channel” applications –Service may be “bid” dynamically –Switching costs minimal –Invocation is programmed in, not dynamic Rapid Application Development –Focus on presentation, integration of services –Easy modification, w/o integration testing

SOA Discussion How can web Services and SOA help protect “intellectual property” in program logic, etc. ?

Chapter 4 Review 3 Forms of Planning –Strategic –Tactical –Operational “Sense and Respond” Digital Assets –Not “consumed” –Asset aspect –Liability aspect

Chapter 10 Review Change Mgmt Risk Mgmt Legacy Evolution Metrics

Discussion Reconcile “Most critical IT decisions are infrastructure” (pg 145) with the sense-respond model of flexible access. What aspects guide decision to build on legacy systems or replace them?