1 / 29

ERP & Web Services - 2013S-

ERP & Web Services - 2013S-. Clinton E. White, Jr Professor of Accounting & MIS College of B&E University of Delaware. ERP (a.k.a ES). ERP (Enterprise Resource Planning) What is the ultimate goal of an ERP? To model the entire business enterprise in software

Télécharger la présentation

ERP & Web Services - 2013S-

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. ERP & Web Services - 2013S- Clinton E. White, Jr Professor of Accounting & MIS College of B&E University of Delaware

  2. ERP (a.k.a ES) • ERP (Enterprise Resource Planning) • What is the ultimate goal of an ERP? • To model the entire business enterprise in software • To process, integrate and make available every bit of information necessary to run the business • Why is it so difficult to accomplish? • Requires a long term commitment to remodeling your business in software • Changes will be significant • Resources will be stretched • Employees will be stressed • Risks are significant

  3. ERP vs. Web Services • ERP • Is a tightly integrated system • Requires “deep linking” • Web Services • Are loosely coupled systems • Does not require deep linking

  4. Web Services • What are Web services?

  5. Today’s Quiz • What was the problem that XML originally sought to address?

  6. Major Premises of WS • Web services are robust because they are simple and flexible (wrap-arounds): • Do not require “deep” linking • Loose coupling = Flexibility in complex environments • Based on a bottom-up, organic approach to IT that respects context • Based on second generation Web IT designed to automate connections

  7. Solve the N-squared Problem • How would you explain the N-squared problem?

  8. Connecting Software Apps • So how do you connect software applications over a network? • Old mental model: Mechanistic • New mental model: Flexiblity

  9. The EDI Solution • We have been connecting business applications for years with EDI: • What’s the problem with EDI?

  10. Business Value • What is the “different way” that Web services generate business value from IT?

  11. Web Services • What are the basic principles?

  12. Web Services Architecture • Foundation Standards & Protocols: • Standards: XML … WSDL … UDDI • Protocols: TCP/IP … HTTP … SOAP • The Service Grid: • A set of specialized utilities: reduces the complexity that participants must support & provides an opportunity for accelerated learning & improvements: • Shared utilities: • Security … 3rd party audit & assessment … Billing & pmt • Service management … managing resources • Resource knowledge management … finding & communicating • Transport management … routing & delivery

  13. Web Services at Work WSDL wrapper WSDL wrapper Vendor Managed Hubs W S I Vendor Managed Hubs Amazon DBMS Other E-businesses XML data in a SOAP envelope W S I • WSDL – Web Services Description Language: • Describes how to interact with the Web service processes • Data types … Port types … Operations … Messages • SOAP – Simple Object Access Protocol: • A protocol for messaging & communication between software applications • Envelope … Body (XML message & data) • UDDI – Universal Description, Discovery & Integration • A directory of available Web services & details about how to access them … how to use the interface

  14. Fed Ex My Business’ Shipping Software • XML • SOAP FedEx Compatible Solutions • Offer FedEx Services within your own software apps • FedEx provides the interface to process your data & provide other services

  15. PayPal.com My Small E-Business • XML • SOAP PayPal.com • Process an order • Customer gets ready to check out • Processes the payment by CC or account • Returns a completed payment record • Keeps all payment info in my account • Process the completed payment, record the sale, & ship the item

  16. SOAP • What is SOAP?

  17. SOAP • <?xml version="1.0"?>< soap:Envelopexmlns:soap="http://www.w3.org/2001/12/soap-envelope"soap:encodingStyle="http://www.w3.org/2001/12/soap-encoding"> < soap:Header> ... < /soap:Header> < soap:Body> ... <soap:Fault> ... </soap:Fault> < /soap:Body>< /soap:Envelope>

  18. SOAP request • POST /InStock HTTP/1.1Host: www.example.orgContent-Type: application/soap+xml; charset=utf-8Content-Length: nnn< ?xml version="1.0"?>< soap:Envelopexmlns:soap="http://www.w3.org/2001/12/soap-envelope"soap:encodingStyle="http://www.w3.org/2001/12/soap-encoding"> <soap:Bodyxmlns:m="http://www.example.org/stock"> <m:GetStockPrice> <m:StockName>IBM</m:StockName> </m:GetStockPrice> </soap:Body>< /soap:Envelope>

  19. SOAP response • HTTP/1.1 200 OKContent-Type: application/soap+xml; charset=utf-8Content-Length: nnn< ?xml version="1.0"?>< soap:Envelopexmlns:soap="http://www.w3.org/2001/12/soap-envelope"soap:encodingStyle="http://www.w3.org/2001/12/soap-encoding"> <soap:Bodyxmlns:m="http://www.example.org/stock"> <m:GetStockPriceResponse> <m:Price>34.5</m:Price> </m:GetStockPriceResponse> </soap:Body>< /soap:Envelope>

  20. WSDL • What is WSDL?

  21. WSDL • <message name="getTermRequest"><part name="term" type="xs:string"/>< /message>< message name="getTermResponse"><part name="value" type="xs:string"/>< /message>< portType name="glossaryTerms"><operation name="getTerm"><input message="getTermRequest"/><output message="getTermResponse"/></operation>< /portType>

  22. UDDI • What is UDDI?

  23. UDDI • Discovering and connecting to Web services: • A cross-industry effort driven by all major platform and software developers • Microsoft, IBM and SAP ran a proof of concept business registry for 5 years then handed it over to OASIS (2005) • Now included in many software packages • Not as popular as originally hoped • Many private UDDI registraries

  24. Amazon EC2 • What is Amazon’s Elastic Compute Cloud?

  25. Web Services at Dell • The Dell supply chain: • Assembly plants, vendor-managed hubs, & suppliers • Assembly plants each with their own legacy IS • Assembly plants rely on vendor-managed hubs for inventory which rely on suppliers • Each had to maintain sufficient inventory buffers • Vendor-managed hubs shipped using weekly demand schedules • Dell had a 5-day ship-to target while its suppliers had fulfillment lead-times of up to 45-days • The problem: How to effectively coordinate with its supply chain partners & their information systems

  26. Web Services at Dell • Initial adoption of WS: • Issued manufacturing schedules to assembly plants through their extranet every 2-hours • Interacted directly with inventory mgmt. systems at vendor-managed hubs with instructions to arrange delivery of components to specific loading docks • Results:

  27. Web Services at Dell • Even better supply chains: • Developed an “event management” system to monitor supplier conditions • Automated inquiries & responses are triggered by specific events which lead to adaptation of the supply chain activities • Results:

  28. Lessons • Lessons from Dell’s “pragmatic adoption” path:

  29. Web Services Resources • X Methods: • http://www.xmethods.net/ • WebServices.org • http://www.webservices.org/ • Web Services Journal • http://www.sys-con.com/webservices/

More Related