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EMF, WSDL and SOAP [message #212409] Wed, 16 April 2008 04:41 Go to previous message
Hallvard Traetteberg is currently offline Hallvard Traetteberg
Messages: 537
Registered: July 2009
Location: Trondheim, Norway
Senior Member
This is a multi-part message in MIME format.
--------------040402080601090203000403
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit

Hi,

As mentioned in a previous post, I'm working on generating a web services
description language (WSDL) file, from an EMF model of the services. The idea is
to model the domain and related services as a "standard" object-oriented model,
and let EMF and my generator handle all the XML and WSDL encoding stuff. I
thought I'd share the current design with you all, so I can get comments before
I put too much effort into the code. Sorry if this really should be sent to
another newsgroup...

First some words about WSDL (as far as I understand). A WSDL file is typically
composed of several elements:
- An XML schema part, which defines and/or imports type definitions. This
essentially defines how domain objects (types) are described using XML. EMF
already has tools for generating XML schemas for Ecore models (export a genmodel
as XML schema).
- A "port type" part. A port type is similar to an interface, in that it defines
a set of abstract operations. Each operation in turn defines the input and
output by means of the (structure of) the messages that are exchanged. The
messages refer to the types (and elements) defined in the XML schema part
(explicitly defined or imported).
- A binding part, which defines how the operations of a port type actually are
implemented. Implemented means what communication protocol is used (and how) to
exchange the relevant messages for invoking operations.
- A service part, which defines where (server address) a set of bindings are
handled.

My current design is as follows:

The domain model is modeled in the usual way, as an Ecore model with classes,
references and attributes, e.g. in a domain.ecore. The services models is
modeled in its own model, e.g. domain-services, with references to the domain
model, using the Load resource... trick. I've chosen to split the models in this
way for two reasons: 1) These two models should be in their own packages, so
they get separate namespaces. 2) It is easier to invoke the generator (an IFile
action) if the services are in their own file.

The services model has three kinds of classes:
- A "port type" class is a class marked as interface (and abstract). Such a
class contains operations only. A port type class is mapped to a WSDL port type.
- A "binding" class is a class that is a subclass of a single port type class.
Such a class contains the same operations as the port type class, but may omit
the parameters. The operations are (just) used as placeholders for annotations,
which are used to include information of the protocols used by the binding.
- A "service" class is a class that is a subclass of a set of binding classes.
It is also a placeholder for annotations that add protocol information. A
service class is mapped to a WSDL service.

I've attached three files, for illustrating the design:
- phonebook.ecore may be used for generating a corresponding xsd file.
- phonebook-services.ecore is used by my generator for generating the WSDL file.
- phonebook-services.wsdl is the desired/resulting WSDL file. BTW, this file has
a reference to a Ecore.xsd file in the same folder. This file can be found on
the org.eclipse.xsd plugin, I think.

Note that I haven't tried generating SOAP requests based on this design, yet.
I'm currently focusing on making the modeling feel natural. It may be changed if
I find out it is difficult (cumbersome) to generate the corresponding SOAP
requests, using EMF current XML support.

Hallvard

--------------040402080601090203000403
Content-Type: text/xml;
name="phonebook.ecore"
Content-Transfer-Encoding: 7bit
Content-Disposition: inline;
filename="phonebook.ecore"

<?xml version="1.0" encoding="UTF-8"?>
<ecore:EPackage xmi:version="2.0"
xmlns:xmi="http://www.omg.org/XMI" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:ecore="http://www.eclipse.org/emf/2002/Ecore" name="phonebook"
nsURI="http:///phonebook.ecore" nsPrefix="pb">
<eClassifiers xsi:type="ecore:EClass" name="Person" eSuperTypes="#//PhoneNumbers">
<eStructuralFeatures xsi:type="ecore:EReference" name="personData" eType="#//PersonData"
containment="true"/>
</eClassifiers>
<eClassifiers xsi:type="ecore:EClass" name="Book">
<eStructuralFeatures xsi:type="ecore:EAttribute" name="bid" eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EString"
iD="true"/>
<eStructuralFeatures xsi:type="ecore:EAttribute" name="name" eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EString"/>
<eStructuralFeatures xsi:type="ecore:EReference" name="persons" upperBound="-1"
eType="#//Person" containment="true"/>
</eClassifiers>
<eClassifiers xsi:type="ecore:EClass" name="PhoneNumber">
<eStructuralFeatures xsi:type="ecore:EAttribute" name="role" eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EString"/>
<eStructuralFeatures xsi:type="ecore:EAttribute" name="type" eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EString"/>
<eStructuralFeatures xsi:type="ecore:EAttribute" name="data" eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EString"/>
</eClassifiers>
<eClassifiers xsi:type="ecore:EClass" name="PhoneNumbers">
<eStructuralFeatures xsi:type="ecore:EReference" name="phoneNumbers" upperBound="-1"
eType="#//PhoneNumber" containment="true"/>
</eClassifiers>
<eClassifiers xsi:type="ecore:EClass" name="Persons">
<eStructuralFeatures xsi:type="ecore:EReference" name="personData" upperBound="-1"
eType="#//PersonData"/>
</eClassifiers>
<eClassifiers xsi:type="ecore:EClass" name="PersonData">
<eStructuralFeatures xsi:type="ecore:EAttribute" name="pid" eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EString"
iD="true"/>
<eStructuralFeatures xsi:type="ecore:EAttribute" name="name" eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EString"/>
</eClassifiers>
</ecore:EPackage>

--------------040402080601090203000403
Content-Type: text/xml;
name="phonebook-services.wsdl"
Content-Transfer-Encoding: base64
Content-Disposition: inline;
filename="phonebook-services.wsdl"

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--------------040402080601090203000403
Content-Type: text/xml;
name="phonebook-services.ecore"
Content-Transfer-Encoding: 7bit
Content-Disposition: inline;
filename="phonebook-services.ecore"

<?xml version="1.0" encoding="UTF-8"?>
<ecore:EPackage xmi:version="2.0"
xmlns:xmi="http://www.omg.org/XMI" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:ecore="http://www.eclipse.org/emf/2002/Ecore" name="services"
nsURI="http:///phonebook/services.ecore" nsPrefix="pbs">
<eClassifiers xsi:type="ecore:EClass" name="IPhoneBook" abstract="true" interface="true">
<eOperations name="addPerson" eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EString">
<eParameters name="book" eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EString"/>
<eParameters name="name" eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EString"/>
</eOperations>
<eOperations name="setPhoneNumber" eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EBoolean">
<eParameters name="book" eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EString"/>
<eParameters name="person" eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EString"/>
<eParameters name="number" eType="ecore:EClass phonebook.ecore#//PhoneNumber"/>
</eOperations>
<eOperations name="getPhoneNumber" eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EString">
<eParameters name="book" eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EString"/>
<eParameters name="person" eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EString"/>
<eParameters name="role" eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EString"/>
</eOperations>
<eOperations name="getAllPhoneNumbers" eType="ecore:EClass phonebook.ecore#//PhoneNumbers">
<eParameters name="book" eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EString"/>
<eParameters name="person" eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EString"/>
<eParameters name="role" eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EString"/>
</eOperations>
<eOperations name="getAllPersons" eType="ecore:EClass phonebook.ecore#//Persons">
<eParameters name="book" eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EString"/>
</eOperations>
<eOperations name="findPersons" eType="ecore:EClass phonebook.ecore#//Persons">
<eParameters name="book" eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EString"/>
<eParameters name="queries" upperBound="-1" eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EString"/>
</eOperations>
</eClassifiers>
<eClassifiers xsi:type="ecore:EClass" name="PhoneBookImpl" eSuperTypes="#//IPhoneBook">
<eAnnotations source="no.hal.soap">
<details key="binding/@transport" value="http://schemas.xmlsoap.org/soap/http"/>
<details key="body/@use" value="literal"/>
</eAnnotations>
<eOperations name="addPerson" eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EString"/>
<eOperations name="setPhoneNumber" eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EBoolean"/>
<eOperations name="getPhoneNumber" eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EString"/>
<eOperations name="getAllPhoneNumbers" eType="ecore:EClass phonebook.ecore#//PhoneNumbers"/>
<eOperations name="getAllPersons" eType="ecore:EClass phonebook.ecore#//Persons"/>
<eOperations name="findPersons" eType="ecore:EClass phonebook.ecore#//Persons"/>
</eClassifiers>
<eClassifiers xsi:type="ecore:EClass" name="PhoneBookService" eSuperTypes="#//PhoneBookImpl"/>
</ecore:EPackage>

--------------040402080601090203000403--

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