150: Integrate over the Web with OpenEdge Web Services

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150 Integrate over the Web with OpenEdge Web
Services
Richard Lausecker
Senior Solution Consultant, Progress Software
Austria
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Initial Audience Reaction
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Session Focus
Implementing OpenEdge Web Services

• Understanding Web Services
• Identify when to use Web Services
• Implementing an OpenEdge service consumer
• Implementing an OpenEdge service provider

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Agenda
Integrate over the Web with OpenEdge Web Services

• The Value of Web Services
• OpenEdge Web Service Provider
• ABL Client as a Consumer

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What is Web Services?
Web Services is Defined by Standards

• Web Services
• A set of standards that comprise a platform for
  building distributed, interoperable applications
• OpenEdge Web Services utilizes W3C standards
• Simple Object Access Protocol (SOAP)
• Web Service Definition Language (WSDL)
• XML

W3C World Wide Web Consortium,
http//www.w3.org/
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Standards SOAP
Simple Object Access Protocol

• Protocol for message exchange
• XML-based
• Independent of encoding, transport, language, and
  platform

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Standards WSDL
Web Services Description Language

• Specifies the interface
• Bindings for the operations
• SOAP over HTTP
• Business methods that can be invoked
  (operations)
• Message structure for each method
• Data fields, types
• Identifies network address of Web service

Contract between provider and consumer
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Consumers and Providers

• Web Service Provider
• Develops and deploys the Web service
• Publishes the WSDL
• Web Service Consumer
• Writes code to access deployed services based on
  the WSDL contract

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The Value of Web Services

• Why to use Web Services
• Heterogeneous applications
• Many valuable Services are available
• Many consumers
• Why not to use Web Services
• Homogenous connectivity
• May not be efficient enough

• Why use Progress for Web Services?
• Progress makes it easy.

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Web Services

• Heterogeneous
• Distributed
• Interoperable
• SOAP
• WSDL
• Consumers
• Providers

What are we really talking about?
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Web Services Demonstration
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Agenda
Integrate over the Web with OpenEdge Web Services

• The Value of Web Services
• ABL Client as a Consumer
• OpenEdge Web Service Provider

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Web Services ABL Client Requirements
What do I need to know?

• How to use the WSDL Analyzer
• A little AppServer persistent procedure syntax

Thats all!
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Web Services ABL Client Process

• Obtain WSDL (or its location)
• Run the WSDL Analyzer on the WSDL
• Generates ABL code snippet in HTML form
• Use WSDL Analyzer information to code calls to
  Web service
• Call the Web service

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OpenEdge Client calling a Web service
Web service consumer
Web service provider
HTTP Client
Request WSDL
Call Service
Client ABL Application Code
Service Response
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WSDL Analyzer (command bprowsdldoc)

• Input WSDL (obtained from service provider)
• Output HTML documentation
• ABL code snippets and examples
• SOAP/XML samples
• Textual information about service

proenvgtbprowsdldoc http//localhost8080/wsa/wsa1/
wsdl?targetURIurnwsProviderEmp
myOutput Documentation written to File///C\OpenE
dge\WRK\myOutput\index.html
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The WSDL Analyzer
Output includes

• Connection information
• How to create a Port type (Persistent Procedure)
• How to call an Operation (Internal Procedure)
• Procedure syntax
• Function syntax
• Data type format

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The WSDL Analyzer
Output limitations

• There is no guarantee (It is a guideline)
• No disconnect and cleanup information
• DELETE OBJECT hPortType.
• hWebServiceDISCONNECT().
• DELETE OBJECT hWebService.

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Demonstration Calling a Web service
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Agenda
Integrate over the Web with OpenEdge Web Services

• The Value of Web Services
• ABL Client as a Consumer
• OpenEdge Web Service Provider

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OpenEdge Web Service Provider
Required Components

• Your Application
• Broken down into services
• Application Server
• Hosts application code exposed as services
• Provides database access
• ProxyGen
• Generate intermediate file used for deployment
  (includes wsdl mapping information)
• Progress Explorer or wsaman
• Manage Web service (deployment)

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OpenEdge Web Service Provider
Required Components

• WSA Servlet
• Interface between the Web Service Consumer and
  the OpenEdge AppServer
• 3rd Party Products
• Java Servlet Engine (JSE)
• Provides environment to run WSA servlet
• Web Server
• Provides HTTP support
• Hosts JSE

WSA Web Services Adapter
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Deploying a OpenEdge Web Service
OpenEdge AppServer
Web Server
OpenEdge Application Business Logic
Java Servlet Engine
WSA Servlet
r-code
WSM
Progress Explorer or wsaman
ProxyGen
Intermediate file used for Web service deployment
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Accessing an OpenEdge Web Service
Web Server
HTTP Listener/Sender
Web service consumer
Java Servlet Engine
WSA Servlet
OpenEdge AppServer
ABL Business Logic
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Demonstration Deploying a Web service
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Web Services Troubleshooting
ABL SOAP Fault
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SOAP Faults
RUN operationName IN hPortType (INPUT value1,
OUTPUT value2) NO-ERROR. IF ERROR-STATUSERROR
THEN DO DO iCnt 1 TO ERROR-STATUSNUM-MESSAGE
S MESSAGE ERROR-STATUSGET-MESSAGE(iCnt)
VIEW-AS ALERT-BOX. END. IF
VALID-HANDLE(ERROR-STATUSERROR-OBJECT-DETAIL)
THEN DO MESSAGE "Fault Code"
ERROR-STATUSERROR-OBJECT-DETAILSOAP-FAULT-CODE
SKIP "Fault Actor "
ERROR-STATUSERROR-OBJECT-DETAILSOAP-FAULT-ACTOR
SKIP "Fault String" ERROR-STATUSERROR-OBJ
ECT-DETAILSOAP-FAULT-STRING SKIP "Fault
Detail" ERROR-STATUSERROR-OBJECT-DETAILSOAP-FAU
LT-DETAIL VIEW-AS ALERT-BOX. END. END.
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SOAP Viewers (prosoapview)
C\Progress\OpenEdge\bin\prowin32.exe -proxyhost
localhost -proxyport 4444
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In Summary
Implementing OpenEdge Web Services

• Understand Web Services
• Identify when to use Web Services
• Progress makes it easy

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For More Progress Information, go to

• Progress eLearning Community
• WSDL for OpenEdge Developers
• Consuming Web Services from OpenEdge
• Opening 4GL Applications to Web Services Clients
• Documentation
• 10.1B Web Services manual
• ProxyGen Changes for Web Services in OpenEdge
  10.1A

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For More Web Services Information, go to

• The World Wide Web Consortium (W3C)
• http//www.w3.org/
• Web Services Interoperability Organization
• http//www.ws-i.org/Default.aspx
• WS-I Basic Profile
• http//www.ws-i.org/Profiles/BasicProfile-1.0-2004
  -04-16.html
• W3 Schools
• http//www.w3schools.com/

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Questions?
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Thank you foryour time
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