ReadWhiteBoard.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)

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', 'SOMETHINGELSE'],
                           Cardinality=2  # framework should be able to fix this config problem
                           )

reader = ReadHandleAlg("Reader",
                       Cardinality=4,
                       OutputLevel=INFO)
reader.Input.Path = product_name

evtslots = 5
algoparallel = 10

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)


# Application setup
ApplicationMgr(TopAlg=[loader, reader],
               EvtMax=500,
               HistogramPersistency="NONE",
               ExtSvc=[whiteboard],
               EventLoop=eventloopmgr)