I have implemented quite a few web services using Axis in the past and I think I have a reasonable understanding of how that side of things works. But I now would like to do something a little more complex, on the server side.
What I want to know is, if it is possible for me to write a handler that can still decode (ie, convert from XML to Java) the named parameters from a soap call - without writing a specific Java method? What I would like to do is to create an object from the (decoded) SOAP parameters, and to pass that to a class of my choosing.
For example, I would like to be able to implement a simple "add" service using two classes (a data interface which holds the arguments to the method, and a concrete implementation), as follows:
public interface AddProperties {
BigDecimal getA();
BigDecimal getB();
}
public class AddCommand {
public Object execute(Object properties)
{
AddProperties addProperties = (AddProperties) properties;
return addProperties.getA().add(addProperties.getB());
}
}
I understand that I could just deploy a "BigDecimal add(BigDecimal a, BigDecimal b)" but this approach doesn't match my needs. What I want to know is, how I can intercept the SOAP processing, populate an object, and then pass that object to another object - instead of just calling a method in a class with the list of parameters?
So, like I say, I've written plenty of basic SOAP services before, but I have no idea where to start looking in order to implement the above. For example, is there a way that I can get the parameters of the SOAP method call converted by Axis into the Java equivalents? How can I create and deploy the same set of handlers or handler chains, on a large number of methods?
I also need to be able to include some pre- and post-processing of the message. I guess that I should use a handler chain to do this, but once again I'm not sure where to start. Do I declare the handler chain in the WSDD? Or in code? Do I have to declare it for every deployed service?
Thanks in advance for any help.
Cheers
Mark
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