Re: Creating Generic Class from 2 classes


"Bill Butler" <qwerty@xxxxxxxx> wrote in message
news:seDZf.990$_T5.968@xxxxxxxxxxx
Comments Inline
"tshad" <tscheiderich@xxxxxxxxxxxxxxx> wrote in message
news:uZGHZEpWGHA.1192@xxxxxxxxxxxxxxxxxxxxxxx
"Bill Butler" <qwerty@xxxxxxxx> wrote in message
news:GHlZf.9895$lz3.5908@xxxxxxxxxxx

"tshad" <tscheiderich@xxxxxxxxxxxxxxx> wrote in message
news:%23uNNtXOWGHA.1192@xxxxxxxxxxxxxxxxxxxxxxx

Hi Tom,

First a few comments

Lets's step back for a second.
If the Web services on the 3 machines a identical, then you *should* be
able to simply change the URL in order to point to another identical
service. You mentioned that you couldn't get this to work, but you
didn't elaborate.

Actually, this was what I originally tried to do.

The Web Services are written in Java and we just have access to them.
But MS seems to have a problem with the Proxy that it builds from the
wsdl. We have another problem with multiple defined arrays (string
[][]), it only defines it as string[]. I need to manually change the
proxy wherever these show up. It may be related to the Java/MS problem.

In this case, I have 2 machines 10.0.0.3 and 10.0.0.25 both running
apache tomcat. In my program, I can add the web services from either
machine with no problem. The first service it finds fine, but the 2nd
one gives us an error and all I do is change the URL. Following is how
it is set up.

RemoteUserService works fine.

But when I call newHireService.readNewHire I get the following error:

System.Web.Services.Protocols.SoapException: The AXIS engine could not
find a target service to invoke! targetService is newHireService at
System.Web.Services.Protocols.SoapHttpClientProtocol.ReadResponse(SoapClientMessage
message, WebResponse response, Stream responseStream, Boolean asyncCall)
at System.Web.Services.Protocols.SoapHttpClientProtocol.Invoke(String
methodName, Object[] parameters)
at ClassLibrary4.NewHire.NewHireServiceService.readNewHire(String in0,
String in1, String in2)
at MyFunctions.NewHire..ctor()
at TestDll.Class1.Main(String[] args) in
c:\vsprojects\testdll\class1.cs:line 24

It can't seem to find the newHireService.

Here is the section of code that changes the URL and the code that calls
the 2 services

*********************************************************************************************
RemoteUserServiceService remoteUserService = new
RemoteUserServiceService();
NewHireServiceService newHireService = new NewHireServiceService();

RemoteUserDataBean ruDataBean;
NewHireDataBean nhDataBean;

public NewHire()
{
sessionID = "150";

remoteUserService.Url =
"http://10.0.0.25:8080/data_connect/services/RemoteUserService";;
newHireService.Url =
"http://10.0.0.25:8080/data_connect/services/newHireService";;

Shouldn't that be "NewHireService"? I am not sure if case matters???

You're right!!!

That solved the URL problem. I am not sure why it has to be Caps - case is
normally not an issue when dealing with other web pages.

I would still like to get my other example to work, just so I understand the
problem and how to use Interfaces over and above what we see in normal
examples on the web or in my book.

Thanks,

Tom




NewHireLogon(sessionID);
if (errorCode == 0)
{
nhDataBean = newHireService.readNewHire(
companyNumber,
userID,
sessionID);


... other code.


private void NewHireLogon(string sessionID)
{
ruDataBean = remoteUserService.fetchRemoteUserInfo(
userID,
"sw",
"",
"C", //Client (employer)
sessionID);

errorCode = ruDataBean.errorCode;
errorMessage = ruDataBean.errorMessage;
}
**************************************************************************************
As you can see, I set the URL, then I call both services. 1st one works
and 2nd one gives the error.

I am not sure why one works and one doesn't. If I comment out the 2
lines that change the URLs, it works fine. I assume the URLs are correct
since it finds the first one (RemoteUserServer).

I would invest some effort in this direction, as it would make your code
cleaner in the long run. It also makes sense that if the only difference
between 3 Web Services is their URL, then they should be represented by
the same class. I don't mean classes with identical structure in
different namespaces. I mean the *same* class.

I agree. It would be cleaner and would be the one I would prefer to use.
I was hoping to wrap the services in a generic one and just call the
Generic functions (as you set up with the interfaces). The only other
way is to create copies of all the calls and call one function when I
need to hit one server and the other function when I need the other
servers services. In essence, what you did with the interfaces.

Absolutely, it would be much nicer.
The solution that I was presenting Is more approriate when you have Feeds
from dissimilar sources. When the Feeds are identical it makes more sense
to simply have each feed be a different instance of the same class.



However, if you wish to go forward
change this
public string GetNewsItem(string a,string b, string c)
{
return news.GetNewsItem(a,b,c);
}

to this
public string GetNewsItem(string a,string b, string c)
{
News3.NewsDataBean bean = news.GetNewsItem(a,b,c);
return bean.final;
}


I am a bit curious as to the reason for your inheritance structure
Why do you need a NewsItem and a NewsItemModules class?
Why do you need a NewsDataBean and a NewsDataBean2?

I did get the argument problem to work.

I was setting up 2 classes in one namespace just to have one class call
another class in the same namespace - as the web service does.

The DataBeans are non standard types (classes). The DataBean in Java is
just a structure. In all the examples I have seen, the returns are
always strings or ints. There is only one string type and one int type
for everyone. The Databeans are also identical, but they aren't standard
types. When you create a proxy with a class, it recreates the class in
each web service (it doesn't do that for strings).

So you can return just NewsDataBean. It has to be class.NewsDataBean or
namespace.class.NewsDataBean (not sure which). But they are different
(strings aren't - as in your example).

If I was only going to use the newsDataBean inside the classes, there
wouldn't be a problem (as in the NewsItem). But I need to get access to
the properties in the DataBean from the program that calls the Services.

In our example I am doing:

Console.WriteLine(theHeadline.GetNewsItem("first","second","third"));

This works because I am returning a string frin GetNewsItem.

But I need to return a Structure (DataBean) which could have strings,
ints, return values, error codes, error messages, etc.

I need to be able to do something like

NewDataBean = theHeadline.GetNewsItem("first","second","third");
Console.WriteLine(NewDataBean.something)

Maybe this is getting too convoluted.

This is the problem with the path we were walking down.
You would have a family classes with exactly the same structure, but no
intrinsic relation between them.
You *could* create Conversion routines for each of the beans that return a
"commonBean". This is NOT the ideal solution as it is NOT very expandible.
Each additional "Identical" service would require a set of new conversion
routines.

The fact that NewHireServiceService works with the default URL, but not
the changed URL sounds suspicious.
Hopefully it is just the Case if the service name.


Good luck
Bill


Thanks,

Tom


Bill








.

Loading