Dr. Paul King ASERT Consulting PO Box 1243, Milton BC Brisbane, QLD

Transcription

1 OR CONFESSIONS OF AN APPLICATION ARCHITECT Dr. Paul King ASERT Consulting PO Box 1243, Milton BC Brisbane, QLD ASERT Education XML & Enterprise Integration - 1

2 TOPICS About ASERT History of Application Development & Integration Best Practice Technology for B2C/B2B ASERT Education XML & Enterprise Integration - 2

3 ABOUT ASERT Specialists in Advanced Software Engineering, Research & Training Small but dynamic consulting and training company based in Brisbane Clients include AT&T, Telstra, Optus, Convergys, Compaq, RSA, Oracle, BEA, Qld SMEs, Qld Govt & others Technologies: Java, EJB, CORBA, XML, Ecommerce, Internet Security, Linux/NT Products: Oracle, RSA, BEA Weblogic, Sun, Inprise/Borland, Netscape, IBM ASERT Education XML & Enterprise Integration - 3

4 Business Climate To remain competitive, companies must: reduce time to market reduce response times eliminate supply-chain inefficiencies improve customer acquisition, retention and satisfaction Requires direct real-time linkage with major trading partners Traditional approaches such as EDI are not wellsuited: lack flexibility, error prone, not real time costly and time-consuming to implement and run ASERT Education XML & Enterprise Integration - 4

5 XML and ecommerce XML is rapidly becoming the lingua franca of e-commerce According to IBM: In the business domain there will soon be specific XML languages to describe orders, transaction, inventory and billing. These open XML languages will allow manufacturers, retailers, and consumers, even banking and accounting systems to share the same data. ASERT Education XML & Enterprise Integration - 5

6 XML & e-commerce (cont d) BizTalk An industry initiative started by Microsoft and supported by a wide range of organizations, from technology vendors like webmethods, SAP and CommerceOne to technology users like Boeing and BP/Amoco Has the goal of driving the rapid, consistent adoption of XML to enable electronic commerce and application integration Defining the BizTalk Framework, a set of guidelines for how to publish schemas in XML and how to use XML messages to easily integrate software programs together in order to build rich new solutions ASERT Education XML & Enterprise Integration - 6

7 History of Application Development and Integration Platform Independent GUI Platform Independent Programs Software Independent Data Adapted from Simon Phipps, IBM Platform Independent Networking ASERT Education XML & Enterprise Integration - 7

8 Confession #1 10 years ago I believed them when they told me they had found the best technology for building distributed systems: Messaging This involved Hand-crafted messages Multiple transports C-based No management No transactions No security ASERT Education XML & Enterprise Integration - 8

9 Confession #2 8 years ago I believed them when they told me they had found the best technology for building distributed systems: DCE This involved Stub-marshaled strongly-typed messages from IDL Transparencies C-based No management Limited transactions Some security ASERT Education XML & Enterprise Integration - 9

10 Confession #3 6 years ago I believed them when they told me they had found the best technology for building distributed systems: CORBA This involved Stub-marshaled messages from IDL Transparencies Object-based (C++) No management Limited transactions Limited security interface StockMarket { float get_price (in string symbol); }; ASERT Education XML & Enterprise Integration - 10

11 Confession #4 5 years ago I believed them when they told me they had found the best technology for linking enterprise systems: EDI This involved Specially-formatted messages Typically leased lines Myriad of standards Burden on partners Limited tools Limited security ASERT Education XML & Enterprise Integration - 11

12 Confession #5 4 years ago I believed them when they told me they had found the best technology for building distributed systems: Multi-tier CORBA This involved Marshalling, IDL Additional transparencies: GUI, Business logic, Data integration logic C++-based Limited management Some transactions Some security GUI Business Logic Data ASERT Education XML & Enterprise Integration - 12

13 Confession #6 3 years ago I believed them when they told me they had found the best technology for building distributed systems: Web-based thin client This involved Web servers Limited transparencies CGI programs hacked together HTML, Java Applets Limited management No transactions Limited security GUI Business Logic Data ASERT Education XML & Enterprise Integration - 13

14 Confession #7 2 years ago I believed them when they told me they had found the best technology for building distributed systems: Application Servers This involved Combining best of web server technology and multi-tier CORBA Rich transparencies HTML, Java Applets, Servlets, SSL Usable management Usable transactions Usable security GUI Business Logic Data ASERT Education XML & Enterprise Integration - 14

15 Confession #8 1 year ago I believed them when they told me they had found the best technology for building distributed systems: EJB Application Servers This involved Best of application server technology Rich transparencies Real advancement towards distributed components Declarative specification of management, security, pooling and transactions GUI Business Logic Data ASERT Education XML & Enterprise Integration - 15

16 Now the answer is XML This involves Hand marshalling Simple messaging transports No strong typing VB/Scripting support No management No transactions No security GUI Business Logic Data What???? Confession Time Again or Confusion Time? ASERT Education XML & Enterprise Integration - 16

17 Is it just me? CORBA Gurus HUH??? Homer Simpson DUH!!! Richard Soley Disclaimer: all quotes except the first two are paraphrased biggest thing going on within OMG over the next 12 months is XML Chris Horn biggest thing for IONA to tackle over the next 12 months is XML Sun sorry we nearly missed the boat with XML but we will rapidly catch up now ASERT Education XML & Enterprise Integration - 17

18 Vertical Facilities OMG Task Force Groups Financial Objects Manufacturing Objects Telecom Objects Healthcare Objects E-Commerce Objects Transportation Objects Horizontal CORBA Facilities CORBA Object Services CORBA ORB ASERT Education XML & Enterprise Integration - 18 Banking Insurance Accounting PDM ERP Shop Floor Auto Tele Netwk Mgmt Stream Control Tele Services MPI Medical Dental E-Payment Offer Loc/Trade EC Services Rail Marine Intermodal

19 Application Servers Application Development Application Integration Adapted from Chris Horn, Iona ASERT Education XML & Enterprise Integration - 19

20 Integration Servers Application Development Application Integration ASERT Education XML & Enterprise Integration - 20

21 Typical Medium to Large Customers Application Development Application Integration ASERT Education XML & Enterprise Integration - 21

22 Best Practice Technology for B2C/B2B Application Development Application Integration B2C B2B ASERT Education XML & Enterprise Integration - 22

23 B2C - Traditional HTML Web Environment SQL Query Client <FONT ><B> Headline</FONT> </B><BR>This is CGI Program SQL Dataset Database the result of your query:<table> <TR><TD>1.885 </TD></TR> Web Server </TD>4.454</TD> <TD> ASERT Education XML & Enterprise Integration - 23

24 Refresher: XSL XML Document Stylesheet Processor transformation New XML format formatting Formatted output XSL Stylesheet ASERT Education XML & Enterprise Integration - 24

25 B2C with XML Client Side Browser Transformation & Rendering HTTP Query Servlet + JDBC Servlet + SAX/DOM Data Store HTTP (+ SSL) Query Client (Performs transformations and formatting: XSL & CSS) <?xmlstylesheet?> <HEAD>Headline </HEAD> <SUMMARY> This is the result of your query: </SUMMARY> <TABLE> <TR><TD>1.885 </TD></TR> <TD>4.454</TD> <TD> XSL Processor Client <Value1>1.885 </Value1> <Value2>0.953 </Value2> <Value3>4.454 </Value3> XML Fragment Web Server Server EJB COM+ CORBA App Server ASERT Education XML & Enterprise Integration - 25

26 B2C Client Side Applet Multi Tier Environment HTTP Query Servlet + JDBC Servlet + SAX/DOM SQL Query Data Store Java Client (Performs transformations and formatting: XSL) <?xmlstylesheet?> <HEAD>Headline </HEAD> <SUMMARY> This is the result of your query: </SUMMARY> <TABLE> <TR><TD>1.885 </TD></TR> <TD>4.454</TD> <TD> IIOP/RMI (+ SSL) XSL Processor Client <Value1>1.885 </Value1> <Value2>0.953 </Value2> <Value3>4.454 </Value3> XML Fragment Web Server Server EJB COM+ CORBA App Server ASERT Education XML & Enterprise Integration - 26

27 B2C with XML Server Side Transformation & Rendering HTTP Query Query Client (Viewer only applies formating, but no transform <?xmlstylesheet?> <HEAD>Headline </HEAD> <SUJMMARY> <TABLE> <TR><TD>1.885 </TD></TR> <TD>4.454</TD> <TD> Web Server XSL Processor XML Fragment <Value1>1.885 </Value1> <Value2>0.953 </Value2> <Value3>4.454 </Value3> Data Store ASERT Education XML & Enterprise Integration - 27

28 B2C Support for Multiple Clients Client Client Application XSLT Processor Client Client Application XML Parser XML Document XML Parser Database Client Application Client XML Parser Multiple views of the data created from the delivered XML data Middleware Business Logic Data integration Server Data can be served up as XML regardless of native format ASERT Education XML & Enterprise Integration - 28

29 B2C Application Development Issues Architecting Reusable Components Change Management: UML design across EJB, JSP, HTML still needs further investigation Application Management All-in-one Ecommerce solutions are great provided they have APIs for evolution Cross platform GUI: Win32, DHTML subset? Java? Technologies: HTML, XML, Servlets, JSP, UML, Java, Java Beans, C++, EJB, CORBA, COM+, Application Servers Products: early days for Ecommerce applications with XML support: Oracle s istore and IBM s net.commerce have open Java APIs and are beginning to support XML ASERT Education XML & Enterprise Integration - 29

30 B2C Application Integration Issues Consistent Interfaces Workflow/Long-term Transactions Integrated Application Management Technologies: HTML, XML, Servlets, JSP, Java, JDBC, C++, EJBs for wrappering, CORBA, COM+, Application Servers Products: Forte conductor ASERT Education XML & Enterprise Integration - 30

31 B2B Typical Scenario Source: webmethods ASERT Education XML & Enterprise Integration - 31

32 B2B Integration Server Architecture SQL Query Data Store Multiple Communication Formats Long-term Transactions & Security XML or XSL processing XSL Processor <Value1>1.885 </Value1> <Value2>0.953 </Value2> <Value3>4.454 </Value3> XML or XSL processing Data Store Multiple Data/App Access Mechanisms SAP XML Document Multiple XML Vocabularies And custom tools Server Integration Server Java Client ASERT Education XML & Enterprise Integration - 32

33 B2B Application Development Issues Similar to B2C issues but should design with Enterprise Portals & Marketplaces in mind Security APIs Internal and External integration Technologies: Public Key Solutions, XML, Servlets, JSP, Java, EJB, CORBA, COM+, Application Servers ASERT Education XML & Enterprise Integration - 33

34 B2B Application Integration Issues Workflow/Long-term Transactions Integrated Application Management Communications Services Document Handlers/Processors Vocabulary handlers Database Access Application Access: SAP, Peoplesoft, customised Interorganisational Security ASERT Education XML & Enterprise Integration - 34

35 B2B Appl n Integration Issues (cont d) To DTD or not to DTD? XML/EDI area is still fluid, need support for multiple protocols XML: cxml, BizTalk, OAG, FpML, RosettaNet EDI OBI (Open Buying on the Internet) Technologies: XML, SSL, XSL, Java, JDBC, Application Servers Products: webmethods B2B, excelon ASERT Education XML & Enterprise Integration - 35