Transcript SOAP and WSDL

Enabling Grids for E-sciencE
Developing a JAX-RPC based service
from wsdl document in a web service
environment
Author E.Slabospitskaya
Location IHEP, Protvino, Russia
www.eu-egee.org
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Necessary Tools
Enabling Grids for E-sciencE
1) Sun Java -2 Software Development Kit Standard Edition
J2sdk-1.4. 2_04
2) Tomcat 5.0 etc
3) jwsdp-1. 5 (Java Web Services Developer Pack)
4) Jwsdp 1.5 tutorial -?
JAX-RPC for XML-based RPC is Java API for developing and
using Web-Services. This is a collection of procedures that can
be called by a remote client over the Internet. JAX-RPC based
on SOAP. JAX-RPC defines runtime environment for creating
and executing XML-based remote procedure calls.
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Files’ Location
Enabling Grids for E-sciencE
Tutorial’ materials
http:
http://w3.ihep.su/egee/NA3_course.shtml
- config.xml
- BNQuoteService.wsdl
- bnclient.java
- jwsdp.sh
- webservices_readme.txt
List of Java WS Developer Pack API
http://java.sun.com/webservices/docs/1.1/api/index.html
List of Java WS Developer Pack API
http://
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Use JAX-RPC to create a web service
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Stubs and ties
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Another important use for a WSDL document is as a basis for creating stubs, the lowlevel classes that are needed by a client to communicate with a remote service. In the
JAX-RPC implementation, the tool that uses a WSDL document to generate stubs is
called wscompile.
The JAX-RPC implementation has another tool, called wsdeploy, that creates ties, the
low-level classes that the server needs to communicate with a remote client. Stubs and
ties, then, perform analogous functions, stubs on the client side and ties on the server
side.
And in addition to generating ties, wsdeploy can be used to create WSDL documents.
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detailed description of what
happens at runtime
Enabling Grids for E-sciencE
•
To call a remote procedure, the HelloClient program invokes a method on
a stub, a local object that represents the remote service.
•
The stub invokes routines in the JAX-RPC runtime system.
•
The runtime system converts the remote method call into a SOAP
message and then transmits the message as an HTTP request.
•
When the server receives the HTTP request, the JAX-RPC runtime system
extracts the SOAP message from the request and translates it into a
method call.
•
The JAX-RPC runtime system invokes the method on the tie object.
•
The tie object invokes the method on the implementation of the
HelloWorld service.
•
The runtime system on the server converts the method's response into a
SOAP message and then transmits the message back to the client as an
HTTP response.
•
On the client, the JAX-RPC runtime system extracts the SOAP message
from the HTTP response and then translates it into a method response for
the HelloClient program.
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Who provides the layers
Enabling Grids for E-sciencE
Layer
Source
HelloClient Program
HelloWorld Service (definition
interface and implementation
class)
Provided by the application
developer
Stubs
Generated by the wscompile tool,
which is run by the application
developer
Ties
Generated by the wsdeploy tool,
which is run by the application
developer
JAX-RPC Runtime
System
Included with the Java WSDP
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Useful Commands for example
Enabling Grids for E-sciencE
• wscompile.sh -gen:client keep –d . Config.xml
• javac bnclient.java
• java bnclient
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List of libraries
Enabling Grids for E-sciencE
• CLASSPATH
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jwsdp-1.5/jaxrpc/lib/jaxrpc-api.jar:
jwsdp-1.5/jaxrpc/lib/jaxrpc-impl.jar:
jwsdp-1.5/jwsdp-shared/lib/jaqname.jar:
jwsdp-1.5/jwsdshared/lib/activation.jar:
jwsdp-1.5/jwsdp-shared/lib/mail.jar:
jwsdp-1.5/saaj/lib/saaj-impl.jar:
jwsdp1.5/jaxp/lib/endorsed/xercesImpl.jar:
jwsdp-1.5/jaxp/lib/endorsed/dom.jar
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