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Best Practices for Adopting SOA

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					Best Practices for Adopting SOA
SOA Overview
        What is SOA?


                Service Oriented Architecture
Service
System capabilities that provide access to functions and data are
appropriately exposed to other components (applications, devices,
networks, etc.)

Oriented
Uses “open” interoperability protocols

Architecture
In its purest form, it’s the connection of systems (simple or complex)
    What Has Slowed True SOA Implementations?

Proprietary tools

Lack of universally accepted protocols

Enterprise governance less emphasized

Legacy roadblocks
                 Result is StovePipe Integration

                    Application         Application



   Application                                        Application



                    Application         Application
   What is Different Now?

Numerous tools and open standards:
Internet, XML, SOAP, UDDI, WSDL, JMS, .NET, etc…

General acceptance of standards

Architecturally integrated Web Services, MOM, and RMI
architectures are now more achievable

Unprecedented urgency to share data
   A Practical Step

   Enterprise Governance being the objective:

Leverage the legacy by decoupling point-to-point
relationships and extending services to external requests

Monolithic legacy applications can be become “service
providers”

Exposing services is more important than how

Service Orientation is infectious
            Integration of Services

                            Application           Application




                            Application           Application
                                     Business Rules
              Publish                                           Inquire
Application Application                                          Application Application



                          Data Transformation Rules
                           Application         Application




                            Application           Application



     The integration of services becomes the Service Bus,
     or what we like to call the Interoperability Hub
     Walk Then Run

Start with simple document-oriented exchanges
Enhance through service aggregation
Prudently evolve toward document-oriented Publish/Subscribe
and Orchestrated relationships


                 Business Function/Service Aggregation

                   Transformation/Routing Services
                       Orchestrated Transactions
                       and Event Driven Services
      SOA Opens the Architecture

As external services development spreads and matures within
an environment, the legacy application components become
“open.”
                    - and therefore -

New application development will begin to be based more on
the integration of services, rather than linking of components
and databases.
                                        Application         Application




                                                Business Rules
                             Publish                                      Inquire
               Application                                                          Application


                                       Data Transformation Rules



                                        Application         Application
Troy Holmes




      Implementing SOA
      How Services Make Applications Open

SOA is a service based architecture that utilizes open,
standards-based Web Services

All applications can speak XML without requiring proprietary
third party products

SOA breaks down the walls of conventional software design, by
enabling reuse of existing applications.

SOA can be used to encapsulate legacy business logic and
provide functionality to a larger user base.
      How Services Make Applications Open

By wrapping services with SOA, agencies will be building the
groundwork for information sharing throughout the
government.
Building new solutions for agencies becomes faster and easier
 Existing services can be quickly combined into new applications, that
  provide enhanced functionality
 The applications are exposed in a standardized format

It becomes the “a la carte” of application processes
        How Services Make Applications Open

In the past applications were integrated in a tightly coupled fashion which led to a
frail implementation

By providing loose coupling to application processes, the consumer is not aware of
the internal implementation, and therefore is protected from changes by the producer.




                         Database               Database
 Consumer                                                           Producer

                             API                  API


                      Data Access    Business      Data Access
                         Tier          Tier           Tier
        How Services Make Applications Open

In the past applications were integrated in a tightly coupled fashion which led to a
frail implementation

By providing loose coupling to application processes, the consumer is not aware of
the internal implementation, and therefore is protected from changes by the producer.




                        Database                Database
                                     Generic
 Consumer                                                           Producer
                                     Service

                           API                    API


                      Data Access    Business    Data Access
                         Tier          Tier         Tier
                How Services Make Applications Open

     An agency can quickly adapt to new methods of communication
     New implementations can be added faster and more reliably in a SOA environment

     New customers send messages based on an agreed contract between the producer and
     consumer
     The implementation is independent of the producer which enables multiple views of
     information without impacting legacy applications

Business Logic       Interface Facade         Customizable Presentation Tier

   Business                               Message
                          Service                       XML
  Application                             Contract                                  ?
                         Producer                     Consumer

    Secure Business Applications
                How Agencies are Integrating Stovepipe
                Applications
                                                           Legacy
                                                          Mainframes


         Today’s Architecture


                                                                                     Data

                                                                                                   Data




Workstation                                     Application
                                                 Servers
                                                                       Application
                                                                        Servers
                                                                                            Data
                                  Web Servers

                                                                                                        Data
                                                                                                      Warehouse
                                                                           Data
                                                                           Marts



                         Report                                        Data
                         Server                                        Marts
            Technologies Used for Integration


                                             Marts                Marts

                                                     Warehouse

                                             Marts                Marts


Message Oriented Middleware                      Data Warehousing
          MOM
     (Hub and Spoke)

                                                                                   Object


                 XML      Service   Legacy                                Object


                       Web Services                              Remote Method Invocations
                                                                          RMI
       Roadmap to SOA

Start by creating services around existing                Application
processes within applications
  Define current business processes within
   existing applications
                                               Business    Business     Business
  Create course grain services that satisfy   Process     Process      Process
   particular business processes

Make these services available to the           Service     Service      Service

internal agency
                                                XML         XML          XML
Expose these services to external agencies
via an Enterprise Interoperability Hub
(Service Bus)
              Roadmap to SOA

                 Application                        Application              Application




Business   Business       Business   Business        Business     Business    Business     Business
Process    Process        Process    Process         Process      Process     Process      Process



Service    Service        Service    Service         Service      Service     Service      Service



 XML        XML            XML        XML             XML          XML         XML          XML




                     Moving from Stovepipes . . .
                    Roadmap to SOA

                       Application                            Application                  Application




Business         Business         Business   Business          Business         Business    Business         Business
Process          Process          Process    Process           Process          Process     Process          Process



Service          Service          Service    Service           Service          Service     Service          Service

                                     Enterprise Interoperability Hub                            Transformation
            Transformation
                                                         Transformation
                                                                                             XML       XML    XML
           XML    XML       XML
                                                        XML     XML       XML




                           Moving from Stovepipes . . . To Shared Services
               Roadmap to SOA

      Enterprise Interoperability Hub
           The next step is to provide a view of the agency to external customers
            via an Enterprise Interoperability Hub
           The Hub will become the mechanism to represent services to external
            agencies.
                                                        SOAP Service             External Agency
                              Portal Service                                         Service


                                        Enterprise Interoperability Hub
Request                                                                                     New Application
                                               Transformation/Routing Services                 Service
                                                  Orchestrated Transactions
                    Data Service                  and Event Driven Services



                                                          MOM Service
                Roadmap to SOA
                                                           Legacy
                                                          Mainframes


         Today’s Architecture


                                                                                     Data

                                                                                                   Data




Workstation                                     Application
                                                 Servers
                                                                       Application
                                                                        Servers
                                                                                            Data
                                  Web Servers

                                                                                                        Data
                                                                                                      Warehouse
                                                                           Data
                                                                           Marts



                         Report                                        Data
                         Server                                        Marts
                 Roadmap to SOA


     Future Architecture

                                   Exposed                   Legacy
                                   Service                  Mainframes
                                                                                          Data
                                      Exposed
                                      Service
                                                                                                        Data
                 Enterprise         Exposed
                                    Service
              Interoperability
                    Hub            Exposed
Workstation    (Service Bus)       Service
                                                              Application
                                                               Servers
                                                                            Application
                                                                             Servers
                         Exposed                                                                 Data
                                              Web Servers
                         Service

                                                                                                             Data
                                                                                                           Warehouse
                                                                                Data
                                                                                Marts



                                   Report                                   Data
                                   Server                                   Marts
                 Roadmap to SOA


     Future Architecture

                                   Exposed                   Legacy
                                   Service                  Mainframes
                                                                                          Data
                                      Exposed
                                      Service
                                                                                                        Data
                 Enterprise         Exposed
                                    Service
              Interoperability
                    Hub            Exposed
Workstation    (Service Bus)       Service
                                                              Application
                                                               Servers
                                                                            Application
                                                                             Servers
                         Exposed                                                                 Data
                                              Web Servers
                         Service

                                                                                                             Data
                                                                                                           Warehouse
                                                                                Data
                                                                                Marts



                                   Report                                   Data
                                   Server                                   Marts
Jeff Simpson




       SOA Best Practices
     What Attendees Will Learn

Best practices for the implementation of service-oriented
architectures (SOA) and web services

How to design a roadmap to consolidate and rationalize diverse
constituent portals, websites, and web services with a common
architecture, security framework, and user interface

Practical suggestions for using resources from legacy systems
with newer applications
     Implementation Best-Practices

What is the Use-Case?

Plan for reuse

Transactions

Tuning and Management
      Plan for Reuse

Scalability

Reliability

Deployment

Documentation
     Pick the Right Interface

Web Services and XML provide best interoperability but not the
best performance

Web Services are not always the right answer

Maybe multiple interfaces? (WS, RMI, JMS, MQ, CORBA,
etc.)
       To UDDI or to Not UDDI ?

When do you publish your WSDL?
 The defacto standard – email

UDDI.org

Excellent source of
information and resources
regarding UDDI, the
specification, and the future
of WebServices discovery
     WebService Management

What does it provide?
 Quality of Service (QoS)

 Service Level Agreements (SLAs)

Registry Services

When to involve the technology?
      Rationalization Roadmap

Service Rationalization or Portal Rationalization?

Is there a difference?
 A portal or portlet does not equal a WebService

Composite Application or Business Process Rationalization?
     Service Rationalization

Creating a new service contract or API that fronts multiple
legacy implementations

Enables service consolidation

Terrific path to drastically reducing TCO              Rationalized
                                                         Service


               Service Fabric                 router
                      adaptor       adaptor              adaptor


                Legacy              Legacy                      Legacy
               Service A           Service B                   Service C
      Portal Rationalization

Collapsing the web interfaces from multiple systems into a
single portal by having each interface be its own portlet within
the portal
     Composite Applications

Business Process Rationalization
 A combination of Service and Portal Rationalization where, through a
  workflow engine, we create a new composite application and new
  interface that leverages existing IT assets in a new unified business
  process
  Integrating the Integration




                     Process / Data Integration
                            App Server



                        SOA Fabric
                                                   WebService Enabled


                               Broker (BEA, WebMethods or Tibco)
                                   Broker
                                                                 WebService Enabled

WebService Enabled         WebService Enabled                      WebService Enabled


                                                                PeopleSoft
HR System 1                HR System 2                             HR System 3
     Adapting Legacy System for SOA

Fronting with a WebService
 Can be done with one of many technologies - Apache Axis, Systinet,
  J2EE Servlet containers (Tomcat, JBoss, WebSphere, WebLogic), etc

 Look to using a WebService Management layer

Utilizing a Messaging system (ESB Flavor 1)
 MQ Series, Tibco, one of many JMS providers

Utilizing Traditional EAI connectors (ESB Flavor 2)
 Vitria, webMethods, SeeBeyond, etc.

				
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posted:6/13/2012
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