FSMCallbackHolder.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 <Gaudi/Interfaces/IFSMCallbackHolder.h>
#include <GaudiKernel/StateMachine.h>
#include <GaudiKernel/extends.h>
#include <algorithm>
#include <map>
#include <vector>
 
namespace Gaudi {

  template <class BASE>
  class FSMCallbackHolder : public extends<BASE, IFSMCallbackHolder> {
 
  public:
    using Parent = extends<BASE, IFSMCallbackHolder>;
    using extends<BASE, IFSMCallbackHolder>::extends;
 
    void registerCallBack( StateMachine::Transition s, IFSMCallbackHolder::CallBack c ) override {
      m_callbacks[s].push_back( std::move( c ) );
    }
 
    StatusCode sysInitialize() override {
      return Parent::sysInitialize().andThen( [&]() { handleCallBacks( StateMachine::INITIALIZE ); } );
    }
    StatusCode sysStart() override {
      return Parent::sysStart().andThen( [&]() { handleCallBacks( StateMachine::START ); } );
    }
    StatusCode sysStop() override {
      return Parent::sysStop().andThen( [&]() { handleCallBacks( StateMachine::STOP ); } );
    }
    StatusCode sysFinalize() override {
      return Parent::sysFinalize().andThen( [&]() { handleCallBacks( StateMachine::FINALIZE ); } );
    }
 
  private:
    void handleCallBacks( StateMachine::Transition state ) {
      std::for_each( m_callbacks[state].begin(), m_callbacks[state].end(),
                     []( IFSMCallbackHolder::CallBack const& c ) { c(); } );
    }
 
    std::map<StateMachine::Transition, std::vector<IFSMCallbackHolder::CallBack>> m_callbacks;
  };
 
} // namespace Gaudi