mix_fromDB_cfi.py

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import FWCore.ParameterSet.Config as cms

# here we define part of the configuration of MixingModule
# the rest, notably:
#            "input","bunchspace","minBunch","maxBunch"
# is to be retrieved from database
# see: https://twiki.cern.ch/twiki/bin/viewauth/CMS/PdmVRunDependentMC

# configuration to model pileup for initial physics phase
from SimGeneral.MixingModule.mixObjects_cfi import * 
from SimGeneral.MixingModule.mixPoolSource_cfi import * 

mix = cms.EDProducer("MixingModule",

    # this is where you activate reading from DB of: "input","bunchspace","minBunch","maxBunch"
    readDB = cms.bool(True),
                     
    LabelPlayback = cms.string(''),

    maxBunch = cms.int32(314159),    ## these three parameters are needed at instantiation time, BUT the actual value will NOT be used
    minBunch = cms.int32(-314159),   ## actual values will be retrieved from database
    bunchspace = cms.int32(314159),  ## [ditto] 

    mixProdStep1 = cms.bool(False),
    mixProdStep2 = cms.bool(False),

    playback = cms.untracked.bool(False),
    useCurrentProcessOnly = cms.bool(False),

    input = cms.SecSource("PoolSource",
        type = cms.string('readDB'),
    sequential = cms.untracked.bool(False),                          
        fileNames = FileNames 
    ),

    mixObjects = cms.PSet(
        mixCH = cms.PSet(
            mixCaloHits
        ),
        mixTracks = cms.PSet(
            mixSimTracks
        ),
        mixVertices = cms.PSet(
            mixSimVertices
        ),
        mixSH = cms.PSet(
            mixSimHits
        ),
        mixHepMC = cms.PSet(
            mixHepMCProducts
        )
    )
)



if mix.readDB == cms.bool(True):
    print ' '
    print 'MixingModule will be configured from db; this is mix.readDB : ',mix.readDB
else :
    print ' '
    print 'MixingModule is NOT going to be configured from db; this is mix.readDB : ',mix.readDB