===========================================================================
Date: Thu, 26 Feb 1998 19:54:07 -0500 (EST)
From: Hye-Chung Kum <kum@cs.unc.edu>
To: Vassil Rusev <roussev@cs.unc.edu>
Subject: question on spreadsheet

I can run all the processes, but somehow 
room manger has problem with binding.
(I ran rmiregistry 6099 on capefear)
I get

Unable to bind RoomManager:
java.rmi.UnexpectedException: Unexpected exception; nested exception is: 
        java.lang.ClassNotFoundException: RoomManager_Stub
        at
sun.rmi.registry.RegistryImpl_Stub.rebind(RegistryImpl_Stub.java:135)
        at java.rmi.Naming.rebind(Naming.java:115)
        at RoomManager.<init>(RoomManager.java:20)
        at RoomManager.main(RoomManager.java:74)


Do you know what I am doing wrong?

Thanks.

===========================================================================
Date: Fri, 27 Feb 1998 11:39:27 -0500 (EST)
From: Vassil Roussev <roussev@cs.unc.edu>
To: Hye-Chung Kum <kum@cs.unc.edu>
Subject: Re: question on spreadsheet

Try restarting the rmiregistry. Another problem may because your CLASSPATH
is not set properly - it should include . and the standard library
classes.zip

It none of these helps - let me know.
--VR

===========================================================================
Date: Mon, 2 Mar 1998 11:08:17 -0500 (EST)
From: Vassil Roussev <roussev@cs.unc.edu>
To: Hye-Chung Kum <kum@cs.unc.edu>
Subject: Re: question on spreadsheet

> where is the standard library classes.zip?

setenv .:/afs/cs.unc.edu/pkg/JDK/prodn/sparc_solaris/jdk1.1.3/lib

> One more questions, what are valid users?

About users - look at the permissions.dat file. Permissions don't mean
much at this point.

--VR

===========================================================================
Date: Tue, 3 Mar 1998 00:56:49 -0500 (EST)
From: Hye-Chung Kum <kum@cs.unc.edu>
To: Vassil Roussev <roussev@cs.unc.edu>
Cc: Hye-Chung Kum <kum@cs.unc.edu>
Subject: Re: question on spreadsheet

Some more questions if you don't mind...

1) can you run more than two clients?  I tried three and 
        all three hung.

2) can you tell me if I have this correct
        rmiregistry: for RMI functions
        roommgr: session mgr
        server: model (observer) 
                some session management (but why have roommgr than?)
        client: view & version (observable)

3) when rmi functions are called in the threads, what
        are the parameters passed?  I guess this if in 
        RMIVersion.java....but can you tell me how big
        "object" or "observer" or "observable" are?
        (Are all observer ObserverAgent & observable ObservablePeer ?)

Thanks.

===========================================================================
Date: Tue, 3 Mar 1998 10:53:26 -0500 (EST)
From: Vassil Roussev <roussev@cs.unc.edu>
To: Hye-Chung Kum <kum@cs.unc.edu>
Subject: Re: question on spreadsheet

On Tue, 3 Mar 1998, Hye-Chung Kum wrote:

> 1) can you run more than two clients?  I tried three and 
>       all three hung.

There is no preset limit on the number of clients. I tried three and it
worked for me, however, if you can really demonstrate how you achieve the
hanging that would be something of interest.

> 2) can you tell me if I have this correct
>       rmiregistry: for RMI functions
>       roommgr: session mgr
>       server: model (observer) 
>               some session management (but why have roommgr than?)
>       server: model (observer) 
>               some session management (but why have roommgr than?)

Server has no SM functions. The list of users it displays is obtained
from the RoomMgr.

>       client: view & version (observable)

The observer/observable protocol is used both locally between the version
and the view  AND remotely - for communication.

> 3) when rmi functions are called in the threads, what
>       are the parameters passed?  I guess this if in 
>       RMIVersion.java....but can you tell me how big
>       "object" or "observer" or "observable" are?
>       (Are all observer ObserverAgent & observable ObservablePeer ?)

This will take more time to explain and I need a whiteboard for that
purpose. We can meet on Friday, if you want.


In general, when updates are sent across the network, they are wrapped up
in objects called CellValue. Actually, a Vector of these is sent,
containing all the updates accumulated during the sleep period of the
ObserverAgent. Given that CellValue.class is 630 bytes, I don't expect
that there is an awful lot of data being sent.

--VR