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| Re: ECF Clients/Servers questions [message #621626 is a reply to message #621625] |
Thu, 14 February 2008 16:35  |
 Scott Lewis
Messages: 1038
Registered: July 2009 |
Senior Member |
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Hi Patrick,
Patrick Dempsey wrote:
> I have two questions about ECF.
> My first question has to do with an understanding of how the concept of
> clients and servers work, using the
> org.eclipse.ecf.examples.remoteservices.client and .server as the
> example. Both the .client and the .server are really
> ECF_GENERIC_CLIENTS, and need an ECF Server to be up and running in
> order to work. The default server is at
> ecftcp://ecf.eclipse.org:3283/server The
> org.eclipse.ecf.examples.remoteservices.server is not a stand alone
> server that org.eclipse.ecf.examples.remoteservices.clients can connect
> to. Is that correct?
Yes. That's correct. The
org.eclipse.ecf.examples.remoteservices.server is a server WRT the
service provided (IRemoteEnvironmentInfo)...but you are correct that it
is a client in a pub/sub group hosted at
ecftcp://ecf.eclipse.org:3283/server
This was a design choice, however...not imposed by ECF at all. It is
just as possible to connect directly to a given target (not a pub/sub
group), and proceed with using the remote services API as shown in this
example. In fact, other providers have other characteristics in this
regard...in the case of r_OSGi as a provider, for example, the connect
target is a peer (rather than a pub/sub group).
>
> Second:
> Do you have an example or thoughts on the pattern to use for
> reconnecting clients. I have a simple ecf client/server based on the
> org.eclipse.ecf.examples.remoteservices. examples, and run them on my
> local machine with the server bundle running in the same runtime as my
> ecf generic server on my local machine. Sometimes the ecf generic
> server starts after my server which causes my server to not be able to
> connect and it throws a org.eclipse.ecf.core.ContainerConnectException.
> Do you just recommend spawning a thread, trying to connect catching the
> connect exception, waiting some period of time and trying again?
For this use case (timing issues on startup) I believe a good answer is
'yes' . You will have to define some simple rule for giving up that
makes sense with your environment (i.e. after 5 minutes of trying give
up) but if you expect to have your server be reliable then the strategy
you define should be OK.
BTW, there are real/known limits to the generic server's scalability.
It wasn't intended or designed to be truly scalable. If you are
intending to do a more serious messaging server implementation I would
suggest using one of the jms or jgroups providers available at
http://ecf1.osuosl.org
or use another, commercial implementation and create your own provider
(e.g. tibco, etc., etc). If you do so, please consider sharing it with
the community!
Thanks,
Scott
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