IAlgContextSvc.h

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/***********************************************************************************\
* (c) Copyright 1998-2025 CERN for the benefit of the LHCb and ATLAS collaborations *
*                                                                                   *
* This software is distributed under the terms of the Apache version 2 licence,     *
* copied verbatim in the file "LICENSE".                                            *
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#pragma once
 
#include <GaudiKernel/EventContext.h>
#include <GaudiKernel/IAlgorithm.h>
#include <GaudiKernel/IInterface.h>
#include <GaudiKernel/SmartIF.h>
#include <vector>

class GAUDI_API IAlgContextSvc : virtual public IInterface {
public:
  DeclareInterfaceID( IAlgContextSvc, 4, 0 );
  typedef std::vector<IAlgorithm*> Algorithms;
 
public:
  virtual StatusCode setCurrentAlg( IAlgorithm* a, const EventContext& context ) = 0;
  virtual StatusCode unSetCurrentAlg( IAlgorithm* a, const EventContext& context ) = 0;
  virtual IAlgorithm* currentAlg() const = 0;
  virtual const Algorithms& algorithms() const = 0;
};
 
namespace Gaudi {
  namespace Utils {
    class GAUDI_API AlgContext final {
    public:
      AlgContext( IAlgorithm* alg, IAlgContextSvc* svc, const EventContext& context );

      AlgContext( IAlgorithm* alg, IAlgContextSvc* svc );

      AlgContext( IAlgorithm* alg, IAlgContextSvc* svc, EventContext&& context ) = delete;

      ~AlgContext();
 
    private:
      // copy constructor is disabled
      AlgContext( const AlgContext& right ) = delete;
      // assignement operator is disabled
      AlgContext& operator=( const AlgContext& right ) = delete;
 
    private:
      SmartIF<IAlgContextSvc> m_svc;
      SmartIF<IAlgorithm>     m_alg;
      const EventContext&     m_context;
    };
  } // namespace Utils
} // namespace Gaudi