Re: StripTool with history for 3.14

[Kay-Uwe Kasemir <kasemirk@ornl.gov>]

On Mar 9, 2006, at 13:20 , Evgeniy Tikhomolov wrote:

> Has anybody converted StripToll to build with EPICS release 3.14 ?
>
> Without history feature it can be built with 3.14.7 on SL4 without  
> problems. But when I try to build it with Channel Archiver (which  
> was built successfully,
> thanks Gasper Pajor) ...
> It can not find osiTime.h (just because it does not exist for  
> 3.14). Then it complains:
>
> ../StripHistoryLANLmodif.cc:144: no matching function for call to `
>   ChannelIterator::getValueAfterTime(const osiTime&, ValueIterator&)'
>
> and other.
>
> It would be nice to get updated StripTool and not to go through all  
> these hedges.

There is currently no support for the striptool history module
interfacing with the R3.14 ChannelArchiver.

Technical reasons include:
- Requests to the data server should be handled asynchronously,
  because they can take time.
  The striptool history module looks like it supports async operation.
  StripHistory.h claims that StripHistory_fetch() is allowed to  
return "..PENDING"
  and invoke a callback when done.
  However, the provided callback is 0, and "..PENDING" isn't really  
supported.
- Striptool has no defined interface where a history module could
  be configured. For the R3.14 archiver, you have to configure the  
data server
  URL and the archive key.
  There are versions of Striptool with #ifdefs that create
  an archive source configuration dialog specific to e.g. a DESY  
data server,
  but I don't want to hack and possibly break Striptool
  to sneak in support for the R3.14 archive data server.

So far, nobody has had time to fix this.

-Kay