Re: Event Server, Callbacks, ...

[dthompson characterlink net (Darrin Thompson)]

Here are some possible solutions:

If you used an event server (TAO has a standalone one that should work 
fine with ORBit) you could do this:

Server object is a push supplier to the event service.

Client objects are push consumers of the event service.

When a change happens:

Server object pushes an event with information about a change.

Client objects all receive the event. 

Client objects all take action as soon as they receive the event.

******
You can get around the lack of event service by doing this:

Server object has a "register" method. 

Clients also implement a "receive notification" object.

At client startup:

Client creates the receive notification object. Client calls the servers 
"register" method with a reference to the notification object.

When a change happens:

The server calls a method on all the receive notification objects it 
knows about. This is kind of a pain because some of the objects may have 
died mysteriously with their clients.

Hope this drivel helps.

Darrin

>>>>>>>>>>>>>>>>>> Original Message <<<<<<<<<<<<<<<<<<

On 10/19/00, 9:08:52 AM, Marcelo CB <corbani async com br> wrote regarding 
Event Server, Callbacks, ...:


> In an application I'm implementing I have a server object holding a
> frequently changed list, and I need the clients to be warned when changes
> happen to the list.

> It seems to me at first that I need something like an event-server, (
> unavailable in ORBit ) but it is still unclear to me how would my client
> 'be warned' of the changes.

> I thought the solution would be to have something like a server
> thread in each client ( ORBit-mt ? ) and a client within the server ( the
> list server itself ) to make the messaging delivery.

> As you see, the thing is kind of messy in my head, and though I read the
> Event Server chapter in the 'Advanced CORBA Programming ', the OMG spec
> for the event services, and read some things Wilhelmi wrote, I seem not 
to
> get it.

> Maybe I'm just too dumb and need some help.

> --
> Marcelo Corbani de Barros                   corbani async com br
> Async Open Source Development - Brasil


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