Difference between revisions of "Data Skimming"
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(Created page with "== Physical EVIO Skims == == Physical REST Skims == == Logical Skims (EventStore) ==") |
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== Physical EVIO Skims == | == Physical EVIO Skims == | ||
| + | |||
| + | * The "evio_writer" plugin (in sim-recon/src/programs/Utilities/plugins/), can be used to write input EVIO events to an output EVIO file. | ||
| + | ** This plugin defines the <span style="color:#0000FF">DEventWriterEVIO</span> class, which handles writing to file. | ||
| + | ** This plugin works for now, but needs to be updated when we switch to including more than one event per EVIO block/buffer. | ||
| + | |||
| + | * To create a physical EVIO skim, create your own empty plugin and in the evnt() method call the <span style="color:#0000FF">DEventWriterEVIO</span> class methods. An example is below (from the "2trackskim" plugin): | ||
| + | |||
| + | <syntaxhighlight> | ||
| + | const DEventWriterEVIO* locEventWriterEVIO = NULL; | ||
| + | locEventLoop->GetSingle(locEventWriterEVIO); | ||
| + | |||
| + | //Save EPICS events | ||
| + | vector<const DEPICSvalue*> locEPICSValues; | ||
| + | locEventLoop->Get(locEPICSValues); | ||
| + | if(!locEPICSValues.empty()) | ||
| + | { | ||
| + | locEventWriterEVIO->Write_EVIOEvent(locEventLoop, "2tracks"); | ||
| + | return NOERROR; | ||
| + | } | ||
| + | |||
| + | vector<const DChargedTrack*> locChargedTracks; | ||
| + | locEventLoop->Get(locChargedTracks, "PreSelect"); | ||
| + | if(locChargedTracks.size() >= 2) | ||
| + | { | ||
| + | locEventWriterEVIO->Write_EVIOEvent(locEventLoop, "2tracks"); | ||
| + | return NOERROR; | ||
| + | } | ||
| + | </syntaxhighlight> | ||
| + | |||
| + | To use these, you must run both your plugin and the evio_writer at the same time (you can replace "2trackskim" with your personal skim plugin): | ||
| + | |||
| + | <syntaxhighlight> | ||
| + | hd_root my_file -PPLUGINS=evio_writer,2trackskim | ||
| + | </syntaxhighlight> | ||
| + | |||
== Physical REST Skims == | == Physical REST Skims == | ||
| + | |||
| + | * '''DEventWriterREST''': Persistent object created by the <span style="color:#0000FF">DEventWriterREST</span> factory. | ||
| + | ** <span style="color:#0000FF">DEventWriterREST</span>::<span style="color:#008000">Write_RESTEvent</span>(<span style="color:#0000FF">string</span>) saves the event into the REST file specified by the string. | ||
| + | |||
| + | <syntaxhighlight> | ||
| + | //e.g., in your plugin's ::evnt() method: | ||
| + | vector<const DEventWriterREST*> locEventWriterRESTVector; | ||
| + | locEventLoop->Get(locEventWriterRESTVector); | ||
| + | locEventWriterRESTVector[0]->Write_RESTEvent(locEventLoop, "b1pi"); //dana_rest_b1pi.hddm | ||
| + | </syntaxhighlight> | ||
| + | |||
| + | * Can write (skim) to many different files in the same plugin, even during multi-threaded execution. | ||
| + | <syntaxhighlight> | ||
| + | //e.g., in your plugin's ::evnt() method: | ||
| + | if((locNumPositiveTracks >= 2) && (locNumNegativeTracks >= 2)) | ||
| + | locEventWriterRESTVector[0]->Write_RESTEvent(locEventLoop, "2+_2-"); | ||
| + | |||
| + | if((locNumPositiveTracks >= 3) && (locNumNegativeTracks >= 2)) | ||
| + | locEventWriterRESTVector[0]->Write_RESTEvent(locEventLoop, "3+_2-"); | ||
| + | </syntaxhighlight> | ||
| + | |||
== Logical Skims (EventStore) == | == Logical Skims (EventStore) == | ||
Latest revision as of 15:04, 21 January 2015
Physical EVIO Skims
- The "evio_writer" plugin (in sim-recon/src/programs/Utilities/plugins/), can be used to write input EVIO events to an output EVIO file.
- This plugin defines the DEventWriterEVIO class, which handles writing to file.
- This plugin works for now, but needs to be updated when we switch to including more than one event per EVIO block/buffer.
- To create a physical EVIO skim, create your own empty plugin and in the evnt() method call the DEventWriterEVIO class methods. An example is below (from the "2trackskim" plugin):
const DEventWriterEVIO* locEventWriterEVIO = NULL; locEventLoop->GetSingle(locEventWriterEVIO); //Save EPICS events vector<const DEPICSvalue*> locEPICSValues; locEventLoop->Get(locEPICSValues); if(!locEPICSValues.empty()) { locEventWriterEVIO->Write_EVIOEvent(locEventLoop, "2tracks"); return NOERROR; } vector<const DChargedTrack*> locChargedTracks; locEventLoop->Get(locChargedTracks, "PreSelect"); if(locChargedTracks.size() >= 2) { locEventWriterEVIO->Write_EVIOEvent(locEventLoop, "2tracks"); return NOERROR; }
To use these, you must run both your plugin and the evio_writer at the same time (you can replace "2trackskim" with your personal skim plugin):
hd_root my_file -PPLUGINS=evio_writer,2trackskim
Physical REST Skims
- DEventWriterREST: Persistent object created by the DEventWriterREST factory.
- DEventWriterREST::Write_RESTEvent(string) saves the event into the REST file specified by the string.
//e.g., in your plugin's ::evnt() method: vector<const DEventWriterREST*> locEventWriterRESTVector; locEventLoop->Get(locEventWriterRESTVector); locEventWriterRESTVector[0]->Write_RESTEvent(locEventLoop, "b1pi"); //dana_rest_b1pi.hddm
- Can write (skim) to many different files in the same plugin, even during multi-threaded execution.
//e.g., in your plugin's ::evnt() method: if((locNumPositiveTracks >= 2) && (locNumNegativeTracks >= 2)) locEventWriterRESTVector[0]->Write_RESTEvent(locEventLoop, "2+_2-"); if((locNumPositiveTracks >= 3) && (locNumNegativeTracks >= 2)) locEventWriterRESTVector[0]->Write_RESTEvent(locEventLoop, "3+_2-");
