Re: [Opentnl-general] NetClassGroup Nightmare

[Mark F. <ma...@ga...>]

Hey Tess,

You were on to the right solution with the NetClassGroups.  You'll need 
to edit the tnlNetBase.h file to look like:

enum NetClassGroup {
   NetClassGroupLogin, ///< Group for community server/authentication 
classes
   NetClassGroupBob,    ///< Group for messages known by Bob and the client.
   NetClassGroupJoe,   ///< Group for messages known by Joe and the client.
   NetClassGroupSally, ///< Group for messages known by Sally and the 
client.
   NetClassGroupInvalid = NetClassGroupCount,
};

enum NetClassMask {
   NetClassGroupLoginMask      = 1 << NetClassGroupLogin,
   NetClassGroupBobMask = 1 << NetClassGroupBob,
   NetClassGroupJoeMask = 1 << NetClassGroupJoe,
   NetClassGroupSallyMask = 1 << NetClassGroupSally,
   NetClassGroupAllMask = (1 << NetClassGroupCount) - 1,
};

You can easily add new service providers by adding a new net class group 
and mask pair.  You'll need to define seperate connection classes for 
each of the connections to the servers, and then implement them with:

TNL_IMPLEMENT_NETCONNECTION(BobConnection, NetClassGroupBob, true);
TNL_IMPLEMENT_NETCONNECTION(JoeConnection, NetClassGroupJoe, true);
TNL_IMPLEMENT_NETCONNECTION(SallyConnection, NetClassGroupSally, true);

Let's say further that there are some messages that all 3 servers know 
how to respond to -- then it would be possible to do something like:

class BaseConnection : public EventConnection
{

    // declare some RPC that all of the connections use

    TNL_DECLARE_RPC(rpcFOO, (StringPtr bar));
};

class BobConnection : public BaseConnection
{
};

class JoeConnection : public BaseConnection
{
};

class SallyConnection : public BaseConnection
{
};

TNL_IMPLEMENT_RPC(BaseConnection, rpcFOO, (StringPtr bar), (bar),
                  (NetClassGroupBobMask | NetClassGroupJoeMask | 
NetClassGroupSallyMask), RPCGuaranteedOrdered, RPCDirAny, 0)
{
    printf("FooBAR!!!: %s", bar.getString());
}

That make sense?

- Mark


Ben Garney wrote:

> Some possible solutions:
>
>    - Give each one stubs for what it has not. And accept it will break 
> if you talk about such to it.
>    - Synchronize the class list on connect.
>    - Use RPCs and define an interface such that you don't have to have 
> them be aware of the classes?
>    - Use a mask system to define what sets of classes different 
> objects know about?
>
> Mark might also have some ideas.
>
> Ben
>
> Tess Snider wrote:
>
>> Oh my aching head.
>>
>> Okay, now, suppose, for the moment, that I had some sort of complex
>> distributed server.  It was built using a small number of discrete
>> server applications that communicate amongst themselves, and some of
>> them communicate with the client.  We'll give some names to the server
>> apps:
>>
>> Login
>> Bob
>> Joe
>> Sally
>>
>> So, the client knows about numerous game objects, including Widgets
>> and Foodlesnorts.  Bob knows about Widgets and Joe knows about
>> Foodlesnorts, but neither knows about both.  Seeing as how these are
>> gameplay-related objects, they've been assigned to NetClassGroupGame. 
>> But there's one little problem.  Since the client knows about both
>> Widgets and Foodlesnorts, its mEventClassCount for the
>> NetClassGroupGame doesn't match Bob's count or Joe's count.  Thus,
>> when the client attempts to connect to Bob, BobConnection's
>> readConnectAccept fails on isVersionBorderCount, because the counts
>> don't  match up.
>>
>> Well, we could hijack NetClassGameMaster, and move the Foodlesnorts
>> into that, even though it feels horribly, horribly wrong.  However,
>> it's not an extensible solution to the problem.  The next time we run
>> into this problem (say, Sally knows about something Bob knows about,
>> but Joe doesn't), we're in the same pickle, and we're out of
>> NetClassGroups (Login uses Community).
>>
>> So, what's the RIGHT solution to this problem?  Any clues?
>>
>> Tess
>>
>>
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>>
>
>
>
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