Thursday, May 20, 2010

Designing an alternative presentation layer!

My first post on the OGSA-DAI blog, on my GSoC 2010 project, with an introduction to the project, initial design decisions, as well as the Google Summer of Codes updates upto the moment, can be found here.

Commit 994 has become my first commit. Apache CXF 2.2.6 has to be downloaded from here and extracted to "ogsa-dai/third-party/packages/cxf/2.2.6" *** (as the case with the Axis presentation layer). After that, "ant all" from"trunk/presentation/cxf/stubs" will produce ogsadai-4.1-cxf-stubs-1.0.jar. This commit is just for the creation of the stubs jar using CXF, and further commits will follow. After the commit, I have included the module info the  repository structure trac page. The OGSA-DAI nightly tests check the modules by running each night on the server [1].


Axis specific wsdl (data_request_execution_service_service.wsdl)
<soap:address location="http://localhost:8080/axis/services/DataRequestExecutionService"/>

CXF specific wsdl
<soap:address location="http://localhost:8080/services/DataRequestExecutionService"/>

  <wsdl:import namespace="" location="data_request_execution_service_bindings.wsdl"/>
  <wsdl:service name="DataRequestExecutionService">
    <wsdl:port name="WSDataRequestExecutionServicePortTypePort" binding="binding:WSDataRequestExecutionServicePortTypeSOAPBinding">
      <soap:address location="http://localhost:8080/services/DataRequestExecutionService"/>

Apache CXF seems to be releasing the builds once in a two months. Currently they have released 2.2.8, though I have started with 2.2.6. I have seen many articles on migrating from Apache Axis 1.x to Axis 2. But articles on migrating to CXF from Axis is rare. Though this makes the task more challenging, it has also given me a chance for a research which of course is really cool.

Java WS Core/Final WSRF Migration Guide  describes the code changes of the Java WS Core Framework of Globus Alliance, including WS-Addressing and Faults.

Building the modules using ANT instead of plain java or CXF WSDLToJava alone is interesting and make the task easier, given the fact that we have many wsdls. The below code segments** are for the existing presentation layers, which are removed for cxf at the moment, as CXF comes with support for WS-Addressing 1.0.  (yet to discuss whether to use the CXF libs or the customized ones from globus/ws-addressing as it is for the existing layers). More to analyze the wsdd for the Axis based layer, and I may need to customize the JAXB bindings, as well. 

# WS-Addressing

[1]  Test Reports 20/05/2010 22:05:50 : daitest
[2] Coding Guidelines

In this post, WSDL code was written using the HTML encoder/decoder provided here.

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