ReadAndWriteWhiteBoard.py

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####################################################################
# Write a DST and a miniDST, including File Summary Records
####################################################################

from Gaudi.Configuration import *
from Configurables import Gaudi__RootCnvSvc as RootCnvSvc, GaudiPersistency
from Configurables import WriteHandleAlg, ReadHandleAlg, HiveWhiteBoard, HiveSlimEventLoopMgr, HiveReadAlgorithm,ForwardSchedulerSvc, AlgResourcePool

# Output Levels
MessageSvc(OutputLevel=WARNING)
IncidentSvc(OutputLevel=DEBUG)
RootCnvSvc(OutputLevel=INFO)
SequencerTimerTool(OutputLevel=WARNING)

# Output setup
# - DST
dst           = OutputStream("RootDst")
dst.ItemList  = ["/Event#999"]
dst.Output    = "DATAFILE='PFN:HandleWB_ROOTOutput.dst'  SVC='Gaudi::RootCnvSvc' OPT='RECREATE'"
dst.NeededResources = ['ROOTIO']

GaudiPersistency()

EventSelector(OutputLevel=DEBUG, PrintFreq=50, FirstEvent=1,
              Input = ["DATAFILE='PFN:HandleWB_ROOTIO.dst'  SVC='Gaudi::RootEvtSelector' OPT='READ'"])
FileCatalog(Catalogs = [ "xmlcatalog_file:HandleWB_ROOTIO.xml" ])

product_name="MyCollision"
product_name_full_path="/Event/"+product_name

loader = HiveReadAlgorithm("Loader",
                           OutputLevel=INFO,
                           NeededResources = ['ROOTIO']
                           )

reader = ReadHandleAlg ("Reader",
                         IsClonable=True,
                         OutputLevel=INFO,
                         NeededResources=["ROOTIO"])
reader.Input.Path=product_name


evtslots = 6
algoparallel = 20

whiteboard   = HiveWhiteBoard("EventDataSvc",
                              EventSlots = evtslots)

eventloopmgr = HiveSlimEventLoopMgr(OutputLevel=INFO)

# We must put the full path in this deprecated expression of dependencies.
# Using a controlflow for the output would be the way to go
scheduler = ForwardSchedulerSvc(MaxAlgosInFlight = algoparallel,
                                OutputLevel=WARNING)
                                
ApplicationMgr( TopAlg = [loader, reader,dst],
                EvtMax   = 44,
                HistogramPersistency = "NONE",
                ExtSvc = [whiteboard],
                EventLoop = eventloopmgr)