Elliott Wolin CEBAF 757-269-6391 wolin@cebaf.gov wrote:
>
> Hi,
>
> Our problem is that occasionally a ca channel disappears for a while,
> and cdev gives up on it. Once cdev thinks a channel is dead, it
> apparently thinks it's dead forever.
>
> I need to have cdev NOT give up on the channel, and to somehow
> reconnect when the channel is available again. It would be ok if I
> had to do this manually, as long as it CAN be done.
>
>
Once a monitor is established on a CA RequestObject it will stay alive.
If the server (ioc) goes down, you will get a callback with CDEV_DISCONNECTED status and no data.
When the server reconnects you will get a new callback with CDEV_RECONNECTED and valid data.
This will happen automatically (as long as you give cdev/ca a chance to pend periodically).
For cdev <= 1.6 this only works for CA, one of the main efforts in cdev/1.6.2 is to provide similar behaviour for the
cdev generic server derived servers.
Now, if you are talking about not ever receiving ANY callbacks, that is a different problem.
My current most robust solution is to periodically check if all requested callbacks have come in at least once.
I retry (a new sendCallback call) dead ones after a couple of minutes.
-Johannes
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