Leveraging Web Services Application Integration. David S. Linthicum CTO Mercator

Transcription

1 Leveraging Web Services Application Integration David S. Linthicum CTO Mercator

2 Master Technology Stack A2A Databases Applications Intranet Middleware Services Adapters Management Integration Services Routing & Rules Transformation Messaging Transactions Integration Services Adapters Process Integration Internet Databases Applications Middleware Services B2B Standards B2B RosettaNet HIPAA EDI XML Standards

3 Application Integration Types Portal -Oriented Process Integration -Oriented Application Service -Oriented Information -Oriented

4 Information-Oriented Application Integration User Interface User Interface Logic Logic Data B2B Data Transformation Formatting

5 Application Service-Oriented Application Integration! Method integration to create a composite application! Sharing business logic! Sharing code! Sharing processing Shared programs Shared transactions Shared objects

6 Value Of Application Service-Oriented Application Integration! Provides true code reuse infrastructure for many enterprise applications! Availability of technology and expertise! Ultimate application integration solution for many trading communities and enterprises

7 Issues With Application Service-Oriented Application Integration! Much more complex and expensive than the other approaches! Takes a lot of time, architecture, and planning! Enabling technology may not scale to enterprise class applications or fall short in other ways! Too invasive for most B2B problem domains

8 Enabling Technology! Application servers! TP monitors! Distributed objects (CORBA/COM)! Traditional development tools! Web Services

9 Application Integration is Evolving Loosely coupled, independent Tightly coupled, interdependent Autonomous Monolithic Applications Data Consistency Multi-step process Composite Applications (Web Services) Autonomous Distributed Applications Business Process Control

10 Multistep Process Dominates For Now 3. Ship Order Order Processing System Logistics and Shipping System Product 4. Update Order Status 4. Send Bill 5. Update Order Status 2. Create Order Web Site Billing System Bill 1. Order supplies Customer Payment

11 Data Consistency Checking System PMI System Change Address 123 Colshire Dr McLean, VA Change Address 123 Colshire Dr McLean, VA Mortgage System Change Address 123 Colshire Dr McLean, VA Web Site Customer Changes address

12 Process Integration Will Define Application Integration Process Model System A System B Company C

13 Composite Application Checking System Savings System Mortgage System Equities System Integration Logic Single View of the Customer Web Site Customer checking on account

14 Contrasting Three Forms of Integration Data Consistency Multi-step Process Co mposite Application Loosely coupled integration Multiple applications Asynchronous dominates One-way Simple abstraction of business rules Loosely coupled integration Multiple applications Can be either Asynchronous or Synchronous based One-way and request/reply Limited complexity in abstraction of business rules Tightly coupled integration Single application Synchronous dominates Request/reply Complex abstraction of business rules

15 Enterprise Architecture Framework Layers Application-Specific Components Business Domain Components Extended Platform Components Platform/Network Components

16 Platform/Network Components! Networks Routers Switches Communication Links Firewalls (assumes functionality limited)! Processors! Operating Systems

17 Extended Platform!Information Systems Technology Services Object Request Brokers (ORBs) Database Management Systems Web browsers, servers Transaction Monitors Legacy system bridges Directory services Application Servers Integration servers System management Custom-written business-independent services

18 Business Domain Shared business services and information!including general-purpose services General ledger Office automation!shared stateful run-time services!reusable code components Key question: business functionality vs. technical support

19 Application Specific! Dedicated to one application GUI Server-side code Data (not shared)

20 Components Are Designed for Reuse Across Applications Home Banking Call Center Branch Application Specific Components Bill Payment Open Account Transfer Change Address Customer Business Domain Components Data Access to Checking Acct Data Access to Savings Acct Distributed Services Extended Platform Components UNIX NT MVS Platform/ Network Components

21 Go to a Branch Office to Change Address Home Banking Call Center Branch Application Specific Components Change Address Customer Business Domain Components Data Access to Checking Acct Data Access to Savings Acct Distributed Services Extended Platform Components UNIX NT MVS Platform/ Network Components

22 Technology Considerations Messaging Oriented Middleware Distributed Object Technology Object Transaction Monitor 4 Common user interface 4 Common programming model 4 Common security model 4 Synchronous integration i DOT - CORBA, DCOM, Java, etc. 4 Asynchronous integration i Message Queuing i Publish & Subscribe 4 Transactional integration i CICS TM & OTM 4 Work flow/flow control 4 Web application services 4 Data transformation/translation 4 Component model (containers or composite objects) 4 Connectors (adapters) 4 Integration with systems management frameworks

23 Integration Tools Application Servers Target delivery of legacy information to the web, with the addition of new logic Message Brokers / MOM Object Request Brokers/ Object Transaction Monitors Target legacy to legacy integration and transform information between applications Mechanisms that find the object and prepare the implementation for the request, then communicate the data

24 Progression Of Application Integration Solutions (EAI and B2B) Web Services Value Message Brokering and Translation Process Integration Transport Application Integration Implementation Order

25 Integration Brokers Invoked As Web Services Deployment Time UDDI UDDI Map Application WS Map Database WSDL WSDL SOAP Adapter Type Tree File ebxml ebxml

26 Integration Brokers Invoked As Web Services Run Time Map Application WS Map Database Web Service SOAP Adapter Type Tree File

27 Web Services Invoked by Integration Brokers Design Time Application Application Map Database WS Map Database Type Tree File SOAP Adapter File UDDI UDDI WSDL WSDL ebxml ebxml

28 Web Services Invoked by Integration Brokers Deployment Time Application Application Map Database Database File SOAP Adapter File

29 Web Services Invoked by Integration Brokers Run Time Application Application Map Database Map Database Type Tree File SOAP Adapter File Web Service

30 Leveraging Web Services for Application Integration