ViewMergeAlg.cxx

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/*
  Copyright (C) 2002-2026 CERN for the benefit of the ATLAS collaboration
*/
 
// AthExStoreGateExample includes
#include "ViewMergeAlg.h"
#include "AthViews/ViewHelper.h"
 
// STL includes
 
// FrameWork includes
#include "Gaudi/Property.h"
#include "StoreGate/ReadHandle.h"
#include "StoreGate/WriteHandle.h"
 
namespace AthViews {
 
StatusCode ViewMergeAlg::initialize()
{
  ATH_MSG_INFO ("Initializing " << name() << "...");
 
  CHECK( m_r_ints.initialize() );
  CHECK( m_w_ints.initialize() );
  CHECK( m_r_views.initialize() );
  
  return StatusCode::SUCCESS;
}
 
StatusCode ViewMergeAlg::finalize()
{
  ATH_MSG_INFO ("Finalizing " << name() << "...");
 
  return StatusCode::SUCCESS;
}
 
StatusCode ViewMergeAlg::execute(const EventContext& ctx) const
{  
  ATH_MSG_DEBUG ("Executing " << name() << "...");
 
  //Merge results
  std::vector< int > outputVector;
  SG::ReadHandle< ViewContainer > inputViews( m_r_views, ctx );
  ViewHelper::ViewMerger merger( evtStore().get(), msg() );
  CHECK( merger.mergeViewCollection( *inputViews,  //Vector of views (inside ReadHandle)
                     m_r_ints,               //ReadHandleKey to access the views
                     ctx,                    //The context of this algorithm
                     outputVector ) );       //Container to merge results into
 
  //Output the merged data
  SG::WriteHandle< std::vector< int > > outputHandle( m_w_ints, ctx );
  CHECK( outputHandle.record( std::make_unique< std::vector< int > >( outputVector ) ) );
  if ( !outputHandle.isValid() )
  {
    ATH_MSG_INFO( "Unable to load main event store for output" );
  }
 
  for ( int const test : outputVector )
  {
    ATH_MSG_INFO( test );
  }
 
  return StatusCode::SUCCESS;
}
 
} //> end namespace AthViews