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Prescaler.cpp

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#include "Prescaler.h"

#include "GaudiKernel/MsgStream.h"
#include "GaudiKernel/AlgFactory.h"

static const AlgFactory<Prescaler>    Factory;
const IAlgFactory& PrescalerFactory = Factory;

Prescaler::Prescaler(const std::string& name, ISvcLocator* pSvcLocator) :
  Algorithm(name, pSvcLocator) ,
  m_pass( 0 ),
  m_seen( 0 )
{
    declareProperty( "PercentPass", m_percentPass=100.0 );
    m_percentPass.verifier().setBounds( 0.0, 100.0 );
}

Prescaler::~Prescaler( )
{
}

StatusCode
Prescaler::initialize()
{
    MsgStream log(msgSvc(), name());
    log << MSG::INFO << name( ) << ":Prescaler::Initialize - pass: " << m_percentPass << endreq;
    return StatusCode::SUCCESS;
}

StatusCode
Prescaler::execute()
{
     MsgStream log(msgSvc(), name());
     m_seen++;
     float fraction = (100.0 * (float)(m_pass+1)) / (float)m_seen;
     if ( fraction > m_percentPass ) {
         setFilterPassed( false );
         log << MSG::INFO << name( ) << ":Prescaler::execute - filter failed" << endreq;
     } else {
         log << MSG::INFO << name( ) << ":Prescaler::execute - filter passed" << endreq;
         m_pass++;
     }
    return StatusCode::SUCCESS;
}

StatusCode
Prescaler::finalize()
{
    MsgStream log(msgSvc(), name());
    log << MSG::INFO << name( ) << ":Prescaler::finalize - total events: "
        << m_seen << ", passed events: " << m_pass << endreq;
    return StatusCode::SUCCESS;
}

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