ReadAthenaPool.py

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# Copyright (C) 2002-2020 CERN for the benefit of the ATLAS collaboration
 

"""
 This is a module for reading event objects in AthenaPool.
 It loads the conversion service shared lib, and the EventInfo converter.
 
 When using Explicit Collection, a query can be applied to the collection attributes
 through the EventSelector for preselecting events. Note only attributes are (run,event) for now.
 For example:
 
 EventSelector.query = 'event > 10 && event < 100';
 
 will select events that have event number in the specified range.
"""
 
def _configureReadAthenaPool():
    """ Helper method to configure Athena to read back POOL files """
 
    from AthenaCommon.Logging import logging
    msg = logging.getLogger( 'configureReadAthenaPool' )
    msg.debug( "Configuring Athena for reading POOL files..." )
 
    from AthenaCommon import CfgMgr
    from AthenaCommon.AppMgr import ServiceMgr as svcMgr
    from AthenaCommon.AppMgr import theApp
 
    # Load the basic services
    import AthenaPoolCnvSvc.AthenaPool  # noqa: F401
 
    # Switch on TTreeCache for CollectionTree
    svcMgr.AthenaPoolCnvSvc.InputPoolAttributes += [ "DatabaseName = '*'; ContainerName = 'CollectionTree'; TREE_CACHE = '-1'" ]
 
    # Load ProxyProviderSvc
    if not hasattr (svcMgr, 'ProxyProviderSvc'):
        svcMgr += CfgMgr.ProxyProviderSvc()
 
    # Add in MetaDataSvc
    if not hasattr (svcMgr, 'MetaDataSvc'):
        svcMgr += CfgMgr.MetaDataSvc ("MetaDataSvc")
    svcMgr.ProxyProviderSvc.ProviderNames += [ "MetaDataSvc" ]
 
    # Add in MetaData Stores
    if not hasattr (svcMgr, 'InputMetaDataStore'):
        svcMgr += CfgMgr.StoreGateSvc ("InputMetaDataStore")
    if not hasattr (svcMgr, 'MetaDataStore'):
        svcMgr += CfgMgr.StoreGateSvc ("MetaDataStore")
 
    # Enable IOVDbSvc to read MetaData
    svcMgr.MetaDataSvc.MetaDataContainer = "MetaDataHdr"
    svcMgr.MetaDataSvc.MetaDataTools += [ "IOVDbMetaDataTool" ]
    if not hasattr (svcMgr.ToolSvc, 'IOVDbMetaDataTool'):
        svcMgr.ToolSvc += CfgMgr.IOVDbMetaDataTool()
 
    # Add in EventSelector
    svcMgr += CfgMgr.EventSelectorAthenaPool ("EventSelector")
    #default InputCollections to FilesInput value of AthenaCommonFlags
    from AthenaCommon.AthenaCommonFlags import jobproperties as jps
    svcMgr.EventSelector.InputCollections = jps.AthenaCommonFlags.FilesInput()
 
    _n = svcMgr.EventSelector.getFullJobOptName()
    theApp.EvtSel = _n
    del _n
 
    # For Analysis release use lower heartbeat
    import os
    if "AthAnalysisBase" in os.environ.get('CMTEXTRATAGS',""):
        # From Will Buttinger to suppress the event loop heartbeat as it is somewhat I/O hungry for
        # no real gain in analysis scenarii
        if not hasattr(svcMgr, theApp.EventLoop):
            svcMgr += getattr(CfgMgr, theApp.EventLoop)()
        evtloop = getattr(svcMgr, theApp.EventLoop)
        try:
            evtloop.EventPrintoutInterval = 10000
        except Exception:
            msg.info('failed suppressing event loop heartbeat. performances might be sub-par... sorry.')
            pass
 
    # Add in AthenaPoolAddressProviderSvc
    if not hasattr (svcMgr, 'AthenaPoolAddressProviderSvc'):
        svcMgr += CfgMgr.AthenaPoolAddressProviderSvc ("AthenaPoolAddressProviderSvc")
    svcMgr.ProxyProviderSvc.ProviderNames += [ "AthenaPoolAddressProviderSvc" ]
 
    # Always want AddressRemappingSvc, since that's responsible for suppressing
    # the read of objects that are produced by a WriteHandle.
    from SGComps.AddressRemappingSvc import getAddressRemappingSvc
    getAddressRemappingSvc()
 
    msg.debug( "Configuring Athena for reading POOL files... [DONE]" )
    return
 

_configureReadAthenaPool()
 

del _configureReadAthenaPool