RavenclawDev: java galaxy server

[Svetlana Stenchikova]

Hi, I am writing a java backend server (using Jason as a sample java
server)

So, as I understand, to write a java server I just need to
1.	extend galaxy.server.Server
2.	start the MainServer from main() of my program
3.	set the class name mainServer.setServerClassName("java_be");
4.	declare public GFrame serverOp<name of operation>(GFrame f) for
all commands that my server accepts.


Thomas, in Jason there is also a   functions: requestInitSession() which
is called from startConversation()
This is necessary for Jason because it is an initiator of a message,
right? The backend server will be a receiver of the messages.


So, now I have a question of how to send a message from the dialog manager
to the backend server.

In RoomLine it is done from an execute agent using a launch_query:
DEFINE_EXECUTE_AGENT( CDBGetEvents,
	CALL("gal_be.launch_query query=get_events <event_query
results>eventlistresult error>backend_error")
		)

If my server name is java_be (specified in mainServer.setServerClassName)
And I have defined a method
  public GFrame serverOpTest(GFrame f) {
    System.err.println("Java backend was called!!!");
    return (GFrame) null;
  }

Now, if I call from the Dialog manager Execute agent:

DEFINE_EXECUTE_AGENT( CDBGetEvents,
	CALL("java_be.Test ")
		)

The ServerOpTest() should get executed, is this correct?


I want to make sure that my java backend server receives a call.
The ServerOpTest() method prints to standard error. I got nothing in the
window where the server was started. Does the stderr output go somewhere
else from the backend server? My DM output has:

[COR at 16:51:16.934] Executing dialog agent /RavenCalendar/TestCallBackend
...
[TMS at 16:51:16.935] Preparing external server call...
[TMS at 16:51:16.935] Calling galaxy server java_be.Test.
[TMD at 16:51:16.936] Calling galaxy server java_be.Test. Call frame dumped
below.
{
query test_query
}

[TMS at 16:51:16.939] Galaxy server call complete.
[TMD at 16:51:16.939] Galaxy server call results dumped below.

[ERR at 16:51:16.939] Cannot parse result from java_be.Test. Does not start
with {
<file c:\documents and settings\sveta\my
documents\work\calendar\ravencalendar\l
ibraries\ravenclaw\dmcore\agents\coreagents\trafficmanageragent.cpp, line
171>.



Since I got no output in the java_be server window, I am not sure if my
server was actually accessed.

Could you please make any suggestions on how to proceed?


Thank you

**************************************************
my main() is:

 public static void main(String[] args) throws
java.io.FileNotFoundException, java.io.IOException, java.lang.Exception {
    MainServer mainServer = new MainServer("java_be", args);
    mainServer.setServerClassName("GoogleConnect");
    try {
      mainServer.start();
    } catch(Exception e) {
      System.err.println(e.toString());
    }
}

---------------------------------------------------------
Svetlana Stenchikova, Ph.D. Candidate
Computer Science Department, Stony Brook University
http://cs.sunysb.edu/~sveta
sveta at cs.sunysb.edu
---------------------------------------------------------