IToolSvc.h

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/***********************************************************************************\
* (c) Copyright 1998-2019 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".                                            *
*                                                                                   *
* In applying this licence, CERN does not waive the privileges and immunities       *
* granted to it by virtue of its status as an Intergovernmental Organization        *
* or submit itself to any jurisdiction.                                             *
\***********************************************************************************/
#ifndef GAUDIKERNEL_ITOOLSVC_H
#define GAUDIKERNEL_ITOOLSVC_H

#include "GaudiKernel/IInterface.h"
#include "GaudiKernel/System.h"
#include <functional>
#include <list>
#include <string>

// Forward declaration
class IAlgTool;

class GAUDI_API IToolSvc : virtual public IInterface {
public:
  DeclareInterfaceID( IToolSvc, 2, 1 );

  // Typedefs
  typedef std::list<IAlgTool*> ListTools;

  virtual StatusCode retrieve( const std::string& type, const InterfaceID& iid, IAlgTool*& tool,
                               const IInterface* parent = 0, bool createIf = true ) = 0;

  virtual StatusCode retrieve( const std::string& type, const std::string& name, const InterfaceID& iid,
                               IAlgTool*& tool, const IInterface* parent = 0, bool createIf = true ) = 0;

  virtual std::vector<std::string> getInstances( const std::string& toolType ) = 0;

  virtual std::vector<std::string> getInstances() const = 0;

  virtual std::vector<IAlgTool*> getTools() const = 0;

  virtual StatusCode releaseTool( IAlgTool* tool ) = 0;

  template <class T>
  StatusCode retrieveTool( const std::string& type, T*& tool, const IInterface* parent = nullptr,
                           bool createIf = true ) {
    return retrieve( type, T::interfaceID(), (IAlgTool*&)tool, parent, createIf );
  }

  template <class T>
  StatusCode retrieveTool( const std::string& type, const std::string& name, T*& tool,
                           const IInterface* parent = nullptr, bool createIf = true ) {
    return retrieve( type, name, T::interfaceID(), (IAlgTool*&)tool, parent, createIf );
  }

  class Observer {
  public:
    virtual ~Observer() {
      if ( m_unregister ) m_unregister();
    }
    void setUnregister( std::function<void()> unregister ) { m_unregister = std::move( unregister ); }

    virtual void onCreate( const IAlgTool* ) {}
    virtual void onRetrieve( const IAlgTool* ) {}

  private:
    std::function<void()> m_unregister;
  };

  virtual void registerObserver( Observer* obs ) = 0;
};

#endif // GAUDIKERNEL_ITOOLSVC_H