Experimental Physics and
Industrial Control System

Hello,

 

I have an issue with Epics V4 PvaClientChannel, working in a Java environment on the v4.2.2 jars.

 

I’m developing a client application, and in normal operations, it all works fine - I can create a PvaClientChannel to the server, make PvaClientGet requests, and PvaClientRPC calls.

 

The problem occurs when I try to do more than one of these at once. For example, if the server is taking a long time to process the PvaClientRPC call, if on another Thread I attempt to do a PvaClientGet or another PvaClientRPC call, it times out when connecting to the channel in the PvaClientChannel.waitConnect(timeout) call.

 

I’ve tried everything I can think of – using the async call to PvaClientRPC.request(),

creating a new PvaClient object for each call (instead of using PvaClient.get(“pva”),

going back to using the ‘older’ Channel and ChannelRPC async way of doing things, but I still get the same problem.

 

The problem isn’t in the server because if I create a separate application to do the second Get or RPC call whilst the first is still waiting, then the server processes it fine.

 

The way I am creating the channels for each call is

 

PvaClientchannel pvaChannel = PvaClient.get(“pva”).createChannel(“mydevice”,”pva”);

pvaChannel.issueConnect();

Status status = pvaChannel.waitConnect(5);

 

Is there another way to do this that allows multiple simultaneous channel access?

 

Please help!

 

Thanks,

 

Matt

 

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