AthPrescaler.cxx

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/*
  Copyright (C) 2002-2026 CERN for the benefit of the ATLAS collaboration
*/
 
// AthPrescaler.cxx
// Implementation file for class AthPrescaler
// Author: S.Binet<binet@cern.ch>
 
#include "AthPrescaler.h"
 
AthPrescaler::AthPrescaler(const std::string& name, ISvcLocator* pSvcLocator) :
  AthAlgorithm( name, pSvcLocator ),
  m_pass( 0 ),
  m_seen( 0 )
{
  declareProperty( "PercentPass", m_percentPass=100.0,
                   "Percentage of events that should be passed" );
  m_percentPass.verifier().setBounds( 0.0, 100.0 );
}
 
AthPrescaler::~AthPrescaler( )
{}
 
StatusCode
AthPrescaler::initialize()
{
  ATH_MSG_INFO ("Initializing " << name() << "..." 
                << endmsg
                << "initialize ==> pass: " << m_percentPass);
  return StatusCode::SUCCESS;
}
 
StatusCode
AthPrescaler::execute(const EventContext& ctx)
{
  ++m_seen;
  float fraction = (float(100.0) * (float)(m_pass+1)) / (float)m_seen;
  if ( fraction > m_percentPass ) {
    setFilterPassed( false, ctx );
    ATH_MSG_INFO ("execute ==> filter failed");
  } else {
    ATH_MSG_INFO ("execute ==> filter passed");
    ++m_pass;
  }
  return StatusCode::SUCCESS;
}
 
StatusCode
AthPrescaler::finalize()
{
  ATH_MSG_INFO ("finalize : " << endmsg
                << "  - total  events: " << m_seen << endmsg
                << "  - passed events: " << m_pass);
 
  return StatusCode::SUCCESS;
}