ServiceLocatorHelper.h

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* (c) Copyright 1998-2019 CERN for the benefit of the LHCb and ATLAS collaborations *
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* This software is distributed under the terms of the Apache version 2 licence,     *
* copied verbatim in the file "LICENSE".                                            *
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* granted to it by virtue of its status as an Intergovernmental Organization        *
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#ifndef GAUDIKERNEL_SERVICELOCATORHELPER_H
#define GAUDIKERNEL_SERVICELOCATORHELPER_H

#include <GaudiKernel/IService.h>
#include <GaudiKernel/ISvcLocator.h>
#include <GaudiKernel/SmartIF.h>
#include <GaudiKernel/StatusCode.h>
#include <string>

class InterfaceID;
class MsgStream;

class GAUDI_API ServiceLocatorHelper {
public:
  ServiceLocatorHelper( ISvcLocator& svcLoc, const INamedInterface& requester )
      : m_svcLoc( svcLoc )
      , m_msgLog( SmartIF<IMessageSvc>( &svcLoc ), requester.name() )
      , // use requester msg level
      m_requesterName( requester.name() ) {}
  ServiceLocatorHelper( ISvcLocator& svcLoc, std::string loggedName, std::string requesterName )
      : m_svcLoc( svcLoc )
      , m_msgLog( SmartIF<IMessageSvc>( &svcLoc ), std::move( loggedName ) )
      , // use requester msg level
      m_requesterName( std::move( requesterName ) ) {}
  ServiceLocatorHelper( ISvcLocator& svcLoc, std::string requesterName )
      : m_svcLoc( svcLoc )
      , m_msgLog( SmartIF<IMessageSvc>( &svcLoc ), requesterName )
      , // use requester msg level
      m_requesterName( std::move( requesterName ) ) {}
#if !defined( GAUDI_V22_API ) || defined( G22_NEW_SVCLOCATOR )
  ServiceLocatorHelper( ISvcLocator&     svcLoc,
                        const MsgStream& log, // use requester msg level
                        std::string      requesterName )
      : m_svcLoc( svcLoc ), m_msgLog( log ), m_requesterName( std::move( requesterName ) ) {}
#endif

  StatusCode getService( std::string_view name, bool createIf, const InterfaceID& iid, void** ppSvc ) const {
    return createIf ? createService( name, iid, ppSvc ) : locateService( name, iid, ppSvc, true );
  }

  StatusCode locateService( std::string_view name, const InterfaceID& iid, void** ppSvc, bool quiet = false ) const;

  StatusCode createService( std::string_view name, const InterfaceID& iid, void** ppSvc ) const;

  StatusCode createService( std::string_view type, std::string_view name, const InterfaceID& iid, void** ppSvc ) const;

  SmartIF<IService> service( std::string_view name, const bool quiet = false, const bool createIf = true ) const;

  template <typename T>
  SmartIF<T> service( std::string_view name, const bool quiet = false, const bool createIf = true ) const {
    return service( name, quiet, createIf ).as<T>();
  }

private:
  ISvcLocator*       serviceLocator() const { return &m_svcLoc; }
  MsgStream&         log() const { return m_msgLog; }
  const std::string& requesterName() const { return m_requesterName; }
  ISvcLocator&       m_svcLoc;
  mutable MsgStream  m_msgLog;
  std::string        m_requesterName;
};
#endif