ISvcLocator.h

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// $Header: /local/reps/Gaudi/GaudiKernel/GaudiKernel/ISvcLocator.h,v 1.15 2006/12/14 12:55:44 hmd Exp $
#ifndef GAUDIKERNEL_ISVCLOCATOR_H
#define GAUDIKERNEL_ISVCLOCATOR_H 1

// Include files
#include "GaudiKernel/IInterface.h"
#include "GaudiKernel/ISvcManager.h"
#include <string>
#include <list>

// Forward class declaration
class IService;

// Declaration of the interface ID ( interface id, major version, minor version) 
static const InterfaceID IID_ISvcLocator(11, 2 , 1); 

class ISvcLocator : virtual public  IInterface  {
public:
  static const InterfaceID& interfaceID() { return IID_ISvcLocator; }
  virtual StatusCode getService( const std::string& name, 
                                 IService*&  svc ) = 0;
  virtual StatusCode getService( const std::string& name,
                                 const InterfaceID& iid,
                                 IInterface*& pinterface ) = 0;

  virtual StatusCode getService( const std::string& name,
                                 IService*& svc,
                                 bool createIf ) = 0;

  //virtual void eraseService(const IService*) = 0;

  virtual const std::list<IService*>& getServices( ) const = 0;

  virtual bool existsService( const std::string& name ) const = 0;

  template <class T>
  StatusCode service( const std::string& name, T*& svc, bool createIf = true ) {
    if( createIf ) {
      IService* s;
      StatusCode sc = getService( name, s, true);
      if ( !sc.isSuccess() ) return sc;  // Must check if initialization was OK!
    }
    return getService( name, T::interfaceID(), (IInterface*&)svc );
  }

  template <class T>
  StatusCode service( const std::string& type, const std::string& name, 
                      T*& svc, bool createIf = false ) {
    try {
      ISvcManager& theManager = dynamic_cast<ISvcManager&>(*this);
      theManager.declareSvcType(name, type).ignore();
    } catch(...) {}
    //even if the above fails we may still find the service, so keep going
    return service(name, svc, createIf);
  }
};


#endif  // GAUDI_ISVCLOCATOR_H