add EventCounter algorithm

[m-fila]

BEGINRELEASENOTES

• Added thread-safeEventCounter algorithm

ENDRELEASENOTES

Adding thread-safe version of EventCounter algorithm. The algorithm will print current event number (as seen by the scheduler) depending on the frequency. Counting the total number of events passed through the algorithm is done with Gaudi::Accumulators::Counter - add MessageSvcSink in order to get a printout about all the Gaudi counters, for instance:

26: ApplicationMgr       INFO Application Manager Initialized successfully
26: ApplicationMgr       INFO Application Manager Started successfully
26: EventCounter         INFO Processing event 0
26: EventCounter         INFO Processing event 2
26: EventCounter         INFO Number of counters : 1
26:  |    Counter                                      |     #     |    sum     | mean/eff^* | rms/err^*  |     min     |     max     |
26:  | "count"                                         |         4 |
26: SilentEventCounter   INFO Number of counters : 1
26:  |    Counter                                      |     #     |    sum     | mean/eff^* | rms/err^*  |     min     |     max     |
26:  | "count"                                         |         4 |
26: ApplicationMgr       INFO Application Manager Stopped successfully
26: SilentEventCounter   INFO Processed 4 events
26: EventCounter         INFO Processed 4 events
26: ApplicationMgr       INFO Application Manager Finalized successfully
26: ApplicationMgr       INFO Application Manager Terminated successfully

Closes #219

[jmcarcell]

I have a few more comments: the original used to have some messages at initialize() and finalize() and also the format was slightly different using EventCounter:: in the name. I think this is a matter of opinion. Maybe @BrieucF and @giovannimarchiori can comment if you like how it is right now (note the counter tables are opt-in, which I think some people will find confusing, why is there a sum, rms, etc).

[giovannimarchiori]

Thanks a lot for this PR!
Would it be possible to add at finalize a simple printout of the form

EventCounter INFO Processed XX events

before the (optional) printout of the tables?
How can one configure the EventCounter to avoid showing the tables BTW?

Thanks again!

[m-fila]

Thanks for the comments. Added finalize - the message seems to be printed after the tables (updated example in the description)

How can one configure the EventCounter to avoid showing the tables BTW?

To avoid printing tables for counters don't add MessageSvcSink to ExtSvc (or change the MessageSvcSink property to skip printing tables for all the counters)

[giovannimarchiori]

Thanks @m-fila ,
that looks good to me!
Giovanni