Cape Clear Overview

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CORBA and Web Services Kevin Curley, Senior
Software Engineer Cape Clear Software
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Web Services

• Web Services are software components
• Defined in WSDL.
• Remotely accessible via SOAP.
• Registered in a UDDI.

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Web Services Standards

• Web Services standards look familiar
• WSDL ? CORBA IDL, Java interfaces
• SOAP ? CORBA IIOP, Java RMI
• UDDI ? CosNaming, CosTrader, JNDI
• But they
• Abstract CORBA, Java, and .NET technologies.
• Are being added to many packaged applications.
• OMG standardization underway
• IDL-to-WSDL mapping

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Leveraging CORBA Components

• Challenges
• Generate WSDL representing the service
• Perform SOAP / IIOP mapping at runtime
• Develop
• WSDL from IDL, client stub generation, XSLT
  creation, etc.
• Deploy
• Expose CORBA interfaces as Web Services

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Generate WSDL from IDL
lt?xml version"1.0" encoding"UTF-8"?gt ltdefinition
s name"helloCorba" targetNamespace"http//www.
capeclear.com/helloCorba.wsdl" xmlns"http//sche
mas.xmlsoap.org/wsdl/" xmlnssoap"http//schemas
.xmlsoap.org/wsdl/soap/" xmlnstns"http//www.ca
peclear.com/helloCorba.wsdl" xmlnsxsd"http//ww
w.w3.org/2001/XMLSchema" xmlnsxsd1"http//www.c
apeclear.com/helloCorba.xsd"gt lttypesgt ltxsdschem
a targetNamespace"http//www.capeclear.com/hell
oCorba.xsd" xmlnsSOAP-ENC"http//schemas.xmlso
ap.org/soap/encoding/" xmlnswsdl"http//schema
s.xmlsoap.org/wsdl/" xmlnsxsd"http//www.w3.or
g/2001/XMLSchema"gt ltxsdcomplexType
name"CCReference"gt ltxsdsequencegt ltxsdelement
maxOccurs"1 minOccurs"0 name"reference
nillable"true type"xsdstring"/gt lt/xsdse
quencegt lt/xsdcomplexTypegt lt/xsdschemagt lt/type
sgt ltmessage namefoo"gt ltpart name"target"
type"xsd1CCReference"/gt lt/messagegt ltmessage
namefooResponse"/gt ltportType
name"server.HelloWorld"gt ltoperation namefoo"
parameterOrder"target"gt ltinput
message"tnsfoo"/gt ltoutput message"tnsfooRes
ponse"/gt lt/operationgt lt/portTypegt ltbinding
name"server.HelloWorldBinding"
type"tnsserver.HelloWorld"gt ltsoapbinding
style"rpc" transport"http//schemas.xmlsoap.org/
soap/http"/gt ltoperation namefoo"gt ltsoapoper
ation soapAction"capeconnecthelloCorbaserver/
HelloWorldgetMessage"/gt ltinputgtltsoapbody
encodingStyle"http//schemas.xmlsoap.org/soap/enc
oding/" namespace"capeconnecthelloCorbaserve
r/HelloWorld use"encoded"/gt lt/inputgt ltout
putgtltsoapbody encodingStyle"http//schemas.xmlso
ap.org/soap/encoding/ namespace"capeconnecth
elloCorbaserver/HelloWorld use"encoded"/gt
lt/outputgtlt/operationgt lt/bindinggt ltservice
name"helloCorba"gt ltdocumentationgthelloCorbalt/do
cumentationgt ltport binding"tnsserver.HelloWorl
dBinding" name"server.HelloWorld"gt ltsoapaddres
s location"http//localhost8000/ccx/helloCorba"/
gt lt/portgt lt/servicegt lt!--Created by
CapeConnect on Fri Mar 08 172959 GMT 2002 See
http//www.capeclear.com for more
details--gt lt/definitionsgt

• WSDL can be a little verbose

interface HelloWorld void foo()
maps to
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Web Services Platform

• SOAP 1.1
• Extensive interoperability testing
• HTTP, HTTPS, SMTP (asynchronous SOAP messaging)
• SOAP attachments and MIME
• UDDI 1.0
• Includes Web-based management GUIs
• .NET, Java, J2EE, and CORBA integration
• BEA WebLogic, IBM WebSphere, Sun iPlanet
• TAO, IONA Orbix, Borland VisiBroker, WebLogic
  Enterprise
• Advanced features
• XSLT engine, security and logging, messaging
  support

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Web Services Example
Web Services complement CORBA technology
Back-end System
CORBA Objects
Web Services Platform
CORBA Objects
Web Service Client (JSPs, VB, .NET)
UDDI
IDL ? WSDL
WSDL
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Q A
Product info www.capeclear.com Email address
kevin.curley_at_capeclear.com