command-instance-manager.hpp

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/*
  COMMAND-INSTANCE-MANAGER.hpp  -  Service to manage command instances for actual invocation

  Copyright (C)         Lumiera.org
    2017,               Hermann Vosseler <Ichthyostega@web.de>

  This program is free software; you can redistribute it and/or
  modify it under the terms of the GNU General Public License as
  published by the Free Software Foundation; either version 2 of
  the License, or (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

*/


#ifndef CONTROL_COMMAND_INSTANCE_MANAGER_H
#define CONTROL_COMMAND_INSTANCE_MANAGER_H

#include "lib/error.hpp"
#include "lib/nocopy.hpp"
#include "steam/control/command.hpp"
#include "steam/control/command-dispatch.hpp"
#include "lib/diff/gen-node.hpp"
#include "lib/symbol.hpp"

#include <unordered_map>
#include <string>



namespace steam {
namespace control {
  
  using std::string;
  using lib::Symbol;
  using lib::diff::Rec;
  
  
  class CommandInstanceManager
    : util::NonCopyable
    {
      CommandDispatch& dispatcher_;
      std::unordered_map<Symbol,Command> table_;
      
    public:
      CommandInstanceManager (CommandDispatch&);
     ~CommandInstanceManager();
      
      Symbol newInstance (Symbol prototypeID, string const& invocationID);
      Command getInstance(Symbol instanceID);
      void dispatch (Symbol instanceID);
      void bindAndDispatch (Symbol instanceID, Rec const& argSeq);
      
      bool contains (Symbol instanceID)  const;
      
    private:
      Command getCloneOrInstance (Symbol, bool);
      void handOver (Command&&);
    };
  
  
  
}} // namespace steam::control
#endif /*CONTROL_COMMAND_INSTANCE_MANAGER_H*/