EDAnalyzer for the online monitoring of the FED using STT spy channel data. More...

Inheritance diagram for SiStripSpyDisplayModule:

Public Member Functions
	SiStripSpyDisplayModule (const edm::ParameterSet &)
	~SiStripSpyDisplayModule ()
Private Member Functions
virtual void	analyze (const edm::Event &, const edm::EventSetup &)
virtual void	beginJob ()
virtual void	beginRun (const edm::Run &, const edm::EventSetup &)
virtual void	endJob ()
Bool_t	MakeDigiHist_ (const edm::Handle< edm::DetSetVector< SiStripDigi > > &digi_handle, uint32_t detID, const TFileDirectory &dir, FEDSpyHistogramType type)
Bool_t	MakeProcessedRawDigiHist_ (const edm::Handle< edm::DetSetVector< SiStripProcessedRawDigi > > &digi_handle, uint32_t specifier, const TFileDirectory &dir, FEDSpyHistogramType type)
Bool_t	MakeRawDigiHist_ (const edm::Handle< edm::DetSetVector< SiStripRawDigi > > &digi_handle, uint32_t specifier, const TFileDirectory &dir, FEDSpyHistogramType type)
Private Attributes
std::vector< uint32_t >	detIDs_
	Vector of detIDs that are of interest (config-specified).
edm::InputTag	inputCompVirginRawDigiLabel_
	VR RawDigis to compare (from mainline)
edm::InputTag	inputCompZeroSuppressedDigiLabel_
	Zero-suppressed digis to compare (from mainline)
edm::InputTag	inputNoisesLabel_
	Label for the noises.
edm::InputTag	inputPayloadRawDigiLabel_
	Label for the virgin raw RawDigi collection input tag.
edm::InputTag	inputPedestalsLabel_
	Label for the pedestals.
edm::InputTag	inputPostCMRawDigiLabel_
	Label for the post-common mode subtraction RawDigi module input tag.
edm::InputTag	inputPostPedestalRawDigiLabel_
	Label for the post-pedestal subtraction RawDigi module input tag.
edm::InputTag	inputReorderedModuleRawDigiLabel_
	Label for the re-ordered RawDigi module input tag.
edm::InputTag	inputReorderedPayloadRawDigiLabel_
	Label for the re-ordered RawDigi module input tag.
edm::InputTag	inputScopeModeRawDigiLabel_
	Label for the scope-mode RawDigi collection input tag.
edm::InputTag	inputZeroSuppressedDigiLabel_
	Guess what? It's the input label for the zero-suppressed digi.
edm::InputTag	inputZeroSuppressedRawDigiLabel_
	Label for the zero-suppressed, zero-padded RawDigi module input tag.
std::string	outputFolderName_
	Name for the folder in the TFileService file output.
sistrip::SpyUtilities	utility_

Detailed Description

EDAnalyzer for the online monitoring of the FED using STT spy channel data.

Author:: Tom Whyntie

Date:: Autumn 2009

See https://twiki.cern.ch/twiki/bin/view/CMS/SiStripSpyDisplayModule for further code documentation, and https://twiki.cern.ch/twiki/bin/view/CMS/FEDSpyChannelMonitoring for more information about the spy channel monitoring project.

Definition at line 93 of file SiStripSpyDisplayModule.cc.

Constructor & Destructor Documentation

SiStripSpyDisplayModule::SiStripSpyDisplayModule ( const edm::ParameterSet & iConfig ) [explicit]

Definition at line 158 of file SiStripSpyDisplayModule.cc.

                                                                               :
    detIDs_(                             iConfig.getParameter< std::vector<uint32_t> >( "detIDs")),
    inputScopeModeRawDigiLabel_(         iConfig.getParameter<edm::InputTag>( "InputScopeModeRawDigiLabel" ) ),
    inputPayloadRawDigiLabel_(           iConfig.getParameter<edm::InputTag>( "InputPayloadRawDigiLabel" ) ),
    inputReorderedPayloadRawDigiLabel_(  iConfig.getParameter<edm::InputTag>( "InputReorderedPayloadRawDigiLabel" ) ),
    inputReorderedModuleRawDigiLabel_(   iConfig.getParameter<edm::InputTag>( "InputReorderedModuleRawDigiLabel" ) ),
    inputPedestalsLabel_(                iConfig.getParameter<edm::InputTag>( "InputPedestalsLabel" ) ),
    inputNoisesLabel_(                   iConfig.getParameter<edm::InputTag>( "InputNoisesLabel" ) ),
    inputPostPedestalRawDigiLabel_(      iConfig.getParameter<edm::InputTag>( "InputPostPedestalRawDigiLabel" ) ),
    inputPostCMRawDigiLabel_(            iConfig.getParameter<edm::InputTag>( "InputPostCMRawDigiLabel" ) ),
    inputZeroSuppressedRawDigiLabel_(    iConfig.getParameter<edm::InputTag>( "InputZeroSuppressedRawDigiLabel" ) ),
    inputZeroSuppressedDigiLabel_(       iConfig.getParameter<edm::InputTag>( "InputZeroSuppressedDigiLabel" ) ),
    inputCompVirginRawDigiLabel_(        iConfig.getParameter<edm::InputTag>( "InputCompVirginRawDigiLabel" ) ),
    inputCompZeroSuppressedDigiLabel_(   iConfig.getParameter<edm::InputTag>( "InputCompZeroSuppressedDigiLabel" ) ),
    outputFolderName_(                   iConfig.getParameter<std::string>(   "OutputFolderName"    ) )
{
   //now do what ever initialization is needed
}

SiStripSpyDisplayModule::~SiStripSpyDisplayModule ( )

Definition at line 178 of file SiStripSpyDisplayModule.cc.

{
   // do anything here that needs to be done at desctruction time
   // (e.g. close files, deallocate resources etc.)
}

Member Function Documentation

void SiStripSpyDisplayModule::analyze	(	const edm::Event &	iEvent,
		const edm::EventSetup &	iSetup
	)		`[private, virtual]`

< detID folder filename

Implements edm::EDAnalyzer.

Definition at line 216 of file SiStripSpyDisplayModule.cc.

References detIDs_, edm::EventID::event(), SiStripFedKey::fedIndex(), edm::Event::getByLabel(), sistrip::SpyUtilities::getDetCabling(), edm::EventBase::id(), inputCompVirginRawDigiLabel_, inputCompZeroSuppressedDigiLabel_, inputNoisesLabel_, inputPayloadRawDigiLabel_, inputPedestalsLabel_, inputPostCMRawDigiLabel_, inputPostPedestalRawDigiLabel_, inputReorderedModuleRawDigiLabel_, inputReorderedPayloadRawDigiLabel_, inputScopeModeRawDigiLabel_, inputZeroSuppressedDigiLabel_, edm::InputTag::instance(), edm::InputTag::label(), MakeDigiHist_(), MakeProcessedRawDigiHist_(), MakeRawDigiHist_(), TFileDirectory::mkdir(), NOISE_VALUES, outputFolderName_, PAYLOAD_RAW, PEDESTAL_VALUES, POST_COMMON_MODE, POST_PEDESTAL, REORDERED_MODULE_RAW, REORDERED_PAYLOAD_RAW, edm::EventID::run(), SCOPE_MODE, utility_, VR_COMP, ZERO_SUPPRESSED, and ZERO_SUPPRESSED_COMP.

{
    using namespace edm;
    using namespace std;

    //retrieve cabling
    const SiStripDetCabling* lCabling = utility_.getDetCabling( iSetup );

    // Set up the event-level histogram folder
    //-----------------------------------------
    // register to the TFileService
    edm::Service<TFileService> fs;

    // Make the EDAnalyzer instance name directory
    TFileDirectory an_dir = fs->mkdir( outputFolderName_ );
    
    // Make the event directory filename
    stringstream ev_dir_name; 
    ev_dir_name << "run" << iEvent.id().run() << "_event" << iEvent.id().event();
    TFileDirectory evdir = an_dir.mkdir( ev_dir_name.str() );

    //if there are no detIds, get them from the comparison digis...
    if (detIDs_.size()==0) {
        //get the detIds of the modules in the zero-suppressed comparison
        if (!((inputCompZeroSuppressedDigiLabel_.label()=="") && (inputCompZeroSuppressedDigiLabel_.instance()==""))) {
            edm::Handle< edm::DetSetVector< SiStripDigi > > czs_digis;
            iEvent.getByLabel( inputCompZeroSuppressedDigiLabel_, czs_digis );
            std::vector< edm::DetSet<SiStripDigi> >::const_iterator digis_it = czs_digis->begin();
            for (; digis_it!=czs_digis->end(); ++digis_it) {
                detIDs_.push_back(digis_it->detId());
            }
        }
        else if (!((inputCompVirginRawDigiLabel_.label()=="") && (inputCompVirginRawDigiLabel_.instance()==""))) {
            edm::Handle< edm::DetSetVector< SiStripRawDigi > > cvr_digis;
            iEvent.getByLabel( inputCompVirginRawDigiLabel_, cvr_digis );
            std::vector< edm::DetSet<SiStripRawDigi> >::const_iterator digis_it = cvr_digis->begin();
            for (; digis_it!=cvr_digis->end(); ++digis_it) {
                detIDs_.push_back(digis_it->detId());
            }
        }

    }

    // Loop over detIDs as obtained from the SpyChannelMonitor config file.
    for (std::vector<uint32_t>::iterator d = detIDs_.begin(); d!=detIDs_.end(); ++d) {
        // TODO: Need some error checking here, probably...
        const std::vector<FedChannelConnection> & conns = lCabling->getConnections( *d );
        //cout << "________________________________________________" << endl;
        //cout << "FED channels found in detId " << *d << " is " << conns.size() << endl;
        if (!(conns.size())) {
            // TODO: Properly DEBUG/warning this...
            //cout << "Skipping detID " << uint32_t(*d) << endl;
            continue;
        }

        // Create a histogram directory for each specified and available detID
        stringstream sss;  
        sss << "detID_" << *d;
        TFileDirectory detID_dir = evdir.mkdir( sss.str() );

        // Loop over the channels found with the detID and add directories.
        for (uint32_t ch = 0; ch<conns.size(); ch++) {
            
            // Name of channel histogram directory
            stringstream ssss; ssss << sss.str() << "_APVpair_" << ch;
            TFileDirectory chan_dir = detID_dir.mkdir(ssss.str());
            
            // Get the fed key from the detID and the channel
            uint32_t fedkey = SiStripFedKey::fedIndex(conns[ch].fedId(), conns[ch].fedCh());
            
            // (Spy) Scope Mode (SM)
            //=======================
            // Get the fed key from the FED ID and the FED channel (from conns)
            // This is because scope mode always stores in the collection by FED ID
            if (!((inputScopeModeRawDigiLabel_.label()=="") && (inputScopeModeRawDigiLabel_.instance()==""))) {
                // Use the SiStripFedKey object to return the FED key
                //cout << "detID=" << *d << ", FED key looking for is " << fedkey << endl;
                //cout << "Attempting to find scope mode raw digis" << endl;
                //
                edm::Handle< edm::DetSetVector< SiStripRawDigi > > sm_rawdigis;
                iEvent.getByLabel( inputScopeModeRawDigiLabel_, sm_rawdigis );
                //
                // Note that the fed key (also a uint32_t) is passed in this case.
                // The method itself doesn't actually care, but it assumes whatever collection
                // is stored in sm_rawdigis is indexed by FED key ;-)
                // TODO: Make this, um, better.
                if (!(MakeRawDigiHist_(sm_rawdigis, fedkey, chan_dir, SCOPE_MODE))) { ; }
            }

            // Payload Unordered Raw (UR)
            //============================
            if (!((inputPayloadRawDigiLabel_.label()=="") && (inputPayloadRawDigiLabel_.instance()==""))) {
                uint32_t fedindex = SiStripFedKey::fedIndex(conns[ch].fedId(), conns[ch].fedCh());
                //cout << "Attempting to find payload mode raw digis" << endl;
                edm::Handle< edm::DetSetVector< SiStripRawDigi > > ur_rawdigis;
                iEvent.getByLabel( inputPayloadRawDigiLabel_, ur_rawdigis );
                if (!(MakeRawDigiHist_(ur_rawdigis, fedindex, chan_dir, PAYLOAD_RAW))) { ; }
            }
            // Payload Reordered Raw
            //=======================
            if (!((inputReorderedPayloadRawDigiLabel_.label()=="") && (inputReorderedPayloadRawDigiLabel_.instance()==""))) {
                uint32_t fedkey = SiStripFedKey::fedIndex(conns[ch].fedId(), conns[ch].fedCh());
                edm::Handle< edm::DetSetVector< SiStripRawDigi > > rrp_rawdigis;
                iEvent.getByLabel( inputReorderedPayloadRawDigiLabel_, rrp_rawdigis );
                if (!(MakeRawDigiHist_(rrp_rawdigis, fedkey, chan_dir, REORDERED_PAYLOAD_RAW))) { ; }
            }
        } // end of loop over channels
        //
        // Module Reordered Raw (RR)
        //====================
        if (!((inputReorderedModuleRawDigiLabel_.label()=="") && (inputReorderedModuleRawDigiLabel_.instance()==""))) {
            edm::Handle< edm::DetSetVector< SiStripRawDigi > > rr_rawdigis;
            iEvent.getByLabel( inputReorderedModuleRawDigiLabel_, rr_rawdigis );
            //cout << "Making Reordered module histogram for detID " << *d << endl;
            if (!(MakeRawDigiHist_(rr_rawdigis, *d, detID_dir, REORDERED_MODULE_RAW))) { ; }
        } // end of ReorderedModuleRaw check
        
        //
        // Pedestal values 
        //========================
        if (!((inputPedestalsLabel_.label()=="") && (inputPedestalsLabel_.instance()==""))) {
            edm::Handle< edm::DetSetVector< SiStripRawDigi > > pd_rawdigis;
            iEvent.getByLabel( inputPedestalsLabel_, pd_rawdigis );
            //cout << "Making pedestal values module histogram for detID " << *d << endl;
            if (!(MakeRawDigiHist_(pd_rawdigis, *d, detID_dir, PEDESTAL_VALUES))) { ; }
        }
         //
        // Noise values 
        //========================
        if (!((inputNoisesLabel_.label()=="") && (inputNoisesLabel_.instance()==""))) {
            edm::Handle< edm::DetSetVector< SiStripProcessedRawDigi > > pd_rawdigis;
            iEvent.getByLabel( inputNoisesLabel_, pd_rawdigis );
            //cout << "Making noise values module histogram for detID " << *d << endl;
            if (!(MakeProcessedRawDigiHist_(pd_rawdigis, *d, detID_dir, NOISE_VALUES))) { ; }
        }
        //
        // Post-Pedestal Raw (PP)
        //========================
        if (!((inputPostPedestalRawDigiLabel_.label()=="") && (inputPostPedestalRawDigiLabel_.instance()==""))) {
            edm::Handle< edm::DetSetVector< SiStripRawDigi > > pp_rawdigis;
            iEvent.getByLabel( inputPostPedestalRawDigiLabel_, pp_rawdigis );
            //cout << "Making post-pedestal module histogram for detID " << *d << endl;
            if (!(MakeRawDigiHist_(pp_rawdigis, *d, detID_dir, POST_PEDESTAL))) { ; }
        }
        //
        // Post-Common Mode Subtraction Raw (PC)
        //=======================================
        if (!((inputPostCMRawDigiLabel_.label()=="") && (inputPostCMRawDigiLabel_.instance()==""))) {
            edm::Handle< edm::DetSetVector< SiStripRawDigi > > pc_rawdigis;
            iEvent.getByLabel( inputPostCMRawDigiLabel_, pc_rawdigis );
            //cout << "Making post-CM module histogram for detID " << *d << endl;
            if (!(MakeRawDigiHist_(pc_rawdigis, *d, detID_dir, POST_COMMON_MODE))) { ; }
        }
        
        //
        // Zero-Suppressed Digis
        //=======================
        bool founddigispy = false, founddigimain = false;
        if (!((inputZeroSuppressedDigiLabel_.label()=="") && (inputZeroSuppressedDigiLabel_.instance()==""))) {
            //cout << "Making ZeroSuppressed histogram!" << endl;
            edm::Handle< edm::DetSetVector< SiStripDigi > > zs_digis;
            iEvent.getByLabel( inputZeroSuppressedDigiLabel_, zs_digis );
            founddigispy = MakeDigiHist_(zs_digis, *d, detID_dir, ZERO_SUPPRESSED);
        }
        //comparison to mainline data
        if (!((inputCompVirginRawDigiLabel_.label()=="") && (inputCompVirginRawDigiLabel_.instance()==""))) {
            //cout << "Making Mainline VirginRaw histogram!" << endl;
            edm::Handle< edm::DetSetVector< SiStripRawDigi > > cvr_digis;
            iEvent.getByLabel( inputCompVirginRawDigiLabel_, cvr_digis );
            founddigimain = MakeRawDigiHist_(cvr_digis, *d, detID_dir, VR_COMP);
        }
        if (!((inputCompZeroSuppressedDigiLabel_.label()=="") && (inputCompZeroSuppressedDigiLabel_.instance()==""))) {
            //cout << "Making ZeroSuppressed histogram!" << endl;
            edm::Handle< edm::DetSetVector< SiStripDigi > > czs_digis;
            iEvent.getByLabel( inputCompZeroSuppressedDigiLabel_, czs_digis );
            founddigimain = MakeDigiHist_(czs_digis, *d, detID_dir, ZERO_SUPPRESSED_COMP);
        }
        //if (founddigimain && founddigispy) cout << "Found digis for both in detid=" << *d << endl;
        
    } // end of loop over detIDs specified in the config.

} // end of Analyze method.

void SiStripSpyDisplayModule::beginJob ( void ) [private, virtual]

Reimplemented from edm::EDAnalyzer.

Definition at line 201 of file SiStripSpyDisplayModule.cc.

References Exception, and edm::Service< T >::isAvailable().

{
    // register to the TFileService
    edm::Service<TFileService> fs;
    // Check that the TFileService has been configured
    if ( !fs.isAvailable() ) {
        throw cms::Exception("Configuration") << "TFileService not available: did you configure it ?";
    }
} // end of beginJob method.

void SiStripSpyDisplayModule::beginRun	(	const edm::Run &	iRun,
		const edm::EventSetup &	iSetup
	)		`[private, virtual]`

Reimplemented from edm::EDAnalyzer.

Definition at line 189 of file SiStripSpyDisplayModule.cc.

{
    // Retrieve FED cabling object
    //iSetup.get<SiStripDetCablingRcd>().get( cabling_ );
    //std::stringstream ss;
    //cabling_->print(ss);
    //std::cout << ss.str() << std::endl;

} // end of beginRun method.

void SiStripSpyDisplayModule::endJob ( void ) [private, virtual]

Reimplemented from edm::EDAnalyzer.

Definition at line 212 of file SiStripSpyDisplayModule.cc.

{}

Bool_t SiStripSpyDisplayModule::MakeDigiHist_	(	const edm::Handle< edm::DetSetVector< SiStripDigi > > &	digi_handle,
		uint32_t	detID,
		const TFileDirectory &	dir,
		FEDSpyHistogramType	type
	)		`[private]`

Definition at line 472 of file SiStripSpyDisplayModule.cc.

References edm::DetSet< T >::data, estimatePileup::hist, TFileDirectory::make(), ZERO_SUPPRESSED, and ZERO_SUPPRESSED_COMP.

Referenced by analyze().

{
    // TODO: Remove the hard-coded numbers.
    TH1S * hist;
    if      (type==ZERO_SUPPRESSED)        hist = dir.make<TH1S>("ZeroSuppressedDigi",      ";Strip number;ADC counts / strip",  768, 0, 768);
    else if (type==ZERO_SUPPRESSED_COMP)   hist = dir.make<TH1S>("ZeroSuppressedDigiComp",  ";Strip number;ADC counts / strip",  768, 0, 768);
    else                                  {hist = 0; return false;}
    
    // TODO: May need to make this error checking independent when refactoring...
    std::vector< edm::DetSet<SiStripDigi> >::const_iterator digis_it = digi_handle->find( detID );
    if (digis_it == digi_handle->end()) {
        return false;
    }
    else {
        //cout << "--* ZS digis found for detID " << detID << endl;
    }

    // Loop over the digis for the detID and APV pair.
    edm::DetSet<SiStripDigi>::const_iterator idigi = digis_it->data.begin();
    bool founddigi = false;
    for ( ; idigi != digis_it->data.end(); ++idigi ) {
        // Check strip number is within the channel limits
        //if ( static_cast<uint16_t>( (*idigi).strip()/256. ) == channel ) {
        //    hist->SetBinContent( ((*idigi).strip())%256 + 1,(*idigi).adc());
        //}
        hist->SetBinContent( static_cast<int>(((*idigi).strip())) + 1, static_cast<int>((*idigi).adc()) );
        if ( (*idigi).adc() > 0 ) founddigi = true;
        //cout << "----* ZS digi found at " << static_cast<int>(((*idigi).strip()))
        //     << ", " << static_cast<int>((*idigi).adc()) << endl;
    } // end of loop over the digis

    return founddigi;
}

Bool_t SiStripSpyDisplayModule::MakeProcessedRawDigiHist_	(	const edm::Handle< edm::DetSetVector< SiStripProcessedRawDigi > > &	digi_handle,
		uint32_t	specifier,
		const TFileDirectory &	dir,
		FEDSpyHistogramType	type
	)		`[private]`

Definition at line 438 of file SiStripSpyDisplayModule.cc.

References prof2calltree::count, edm::DetSet< T >::data, estimatePileup::hist, TFileDirectory::make(), and NOISE_VALUES.

Referenced by analyze().

{
    // TODO: Remove the hard-coded numbers(!).
    TH1F * hist;
    if (type==NOISE_VALUES) hist = dir.make<TH1F>("NoiseValues",";Strip number;Noise / strip",768, 0, 768);
    else {
      hist = 0; 
      return false;
    }

    // TODO: May need to make this error checking independent when refactoring...
    //std::cout << "| * digis for " << type << " and detID " << specifier;
    std::vector< edm::DetSet<SiStripProcessedRawDigi> >::const_iterator digis_it = digi_handle->find( specifier );
    if (digis_it == digi_handle->end()) { 
        //std::cout << " not found :( ";
        return false;
    }
    //std::cout << std::endl;

    // Loop over the digis for the detID and APV pair.
    edm::DetSet<SiStripProcessedRawDigi>::const_iterator idigi = digis_it->data.begin();
    uint32_t count = 0;
    for ( ; idigi != digis_it->data.end(); ++idigi ) {
        count++;
        hist->SetBinContent(count,static_cast<float>((*idigi).adc()));
    } // end of loop over the digis
    return true; // Success! (Probably.)
}

Bool_t SiStripSpyDisplayModule::MakeRawDigiHist_	(	const edm::Handle< edm::DetSetVector< SiStripRawDigi > > &	digi_handle,
		uint32_t	specifier,
		const TFileDirectory &	dir,
		FEDSpyHistogramType	type
	)		`[private]`

Definition at line 399 of file SiStripSpyDisplayModule.cc.

References prof2calltree::count, edm::DetSet< T >::data, estimatePileup::hist, TFileDirectory::make(), PAYLOAD_RAW, PEDESTAL_VALUES, POST_COMMON_MODE, POST_PEDESTAL, REORDERED_MODULE_RAW, REORDERED_PAYLOAD_RAW, SCOPE_MODE, VR_COMP, and ZERO_SUPPRESSED_PADDED.

Referenced by analyze().

{
    // TODO: Remove the hard-coded numbers(!).
    TH1S * hist;
    if      (type==SCOPE_MODE)             hist = dir.make<TH1S>("ScopeMode",           ";Sample number;ADC counts / strip", 298, 0, 298);
    else if (type==PAYLOAD_RAW)            hist = dir.make<TH1S>("PayloadRaw",          ";Sample number;ADC counts / strip", 256, 0, 256);
    else if (type==REORDERED_PAYLOAD_RAW)  hist = dir.make<TH1S>("ReorderedPayloadRaw", ";Sample number;ADC counts / strip", 256, 0, 256);
    else if (type==REORDERED_MODULE_RAW)   hist = dir.make<TH1S>("ReorderedModuleRaw",  ";Sample number;ADC counts / strip", 768, 0, 768);
    else if (type==PEDESTAL_VALUES)        hist = dir.make<TH1S>("PedestalValues",      ";Strip number;Pedestal / strip",    768, 0, 768);
    else if (type==POST_PEDESTAL)          hist = dir.make<TH1S>("PostPedestal",        ";Strip number;ADC counts / strip",  768, 0, 768);
    else if (type==POST_COMMON_MODE)       hist = dir.make<TH1S>("PostCommonMode",      ";Strip number;ADC counts / strip",  768, 0, 768);
    else if (type==ZERO_SUPPRESSED_PADDED) hist = dir.make<TH1S>("ZeroSuppressedRaw" ,  ";Strip number;ADC counts / strip",  768, 0, 768);
    else if (type==VR_COMP)                hist = dir.make<TH1S>("VirginRawCom" ,       ";Strip number;ADC counts / strip",  768, 0, 768);
    else                                  {hist = 0; return false;}

    // TODO: May need to make this error checking independent when refactoring...
    //std::cout << "| * digis for " << type << " and detID " << specifier;
    std::vector< edm::DetSet<SiStripRawDigi> >::const_iterator digis_it = digi_handle->find( specifier );
    if (digis_it == digi_handle->end()) { 
        //std::cout << " not found :( ";
        return false;
    }
    //std::cout << std::endl;

    // Loop over the digis for the detID and APV pair.
    edm::DetSet<SiStripRawDigi>::const_iterator idigi = digis_it->data.begin();
    uint32_t count = 0;
    for ( ; idigi != digis_it->data.end(); ++idigi ) {
        count++;
        hist->SetBinContent(count,static_cast<int>((*idigi).adc()));
    } // end of loop over the digis
    return true; // Success! (Probably.)
}