Experimental Physics and
Industrial Control System

Hello,

 

I have an issue with PvaClientRPC in Java. It may be that I’m not using it correctly, or it may be a bug/desired behaviour.

 

I send an RPC request in the following way:

 

PvaClientChannel pvaChannel = pvaClient.createChannel(“mydevice”,"pva");

pvaChannel.issueConnect();

status = pvaChannel.waitConnect(3);

[ …check status is ok… ]

PvaClientRPC rpc = pvaChannel.createRPC(myMethodStructure);

rpc.issueConnect();

status = rpc.waitConnect();

[ …check status is ok… ]

pvResult = rpc.request(myParametersStructure);

 

The timeout is set to 0 (wait until completes).

 

This all works fine is normal operations. The problem occurs if the rpc ‘server’ that I am connecting to crashes while dealing with that request. If it does, the call to PvaClientRPC.request() continues blocking. There is some output in the console:

 

[MainThread]error mydevice mydevice connection state DISCONNECTED

 

So it ‘knows’ that the device has been disconnected, but it doesn’t throw any exception up to the caller or return, so it continues to wait forever.

 

Is this expected? Is there a way I can work around it?

 

Thanks for your assistance,

 

Matt