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, AvalancheSchedulerSvc, 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", 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 = AvalancheSchedulerSvc(
    ThreadPoolSize=algoparallel,
    OutputLevel=WARNING,
    CheckDependencies=True,
    DataLoaderAlg=loader.name())

ApplicationMgr(
    TopAlg=[loader, reader, dst],
    EvtMax=44,
    HistogramPersistency="NONE",
    ExtSvc=[whiteboard],
    EventLoop=eventloopmgr)