- Added some source code

git-svn-id: svn://svn.gna.org/svn/sgpemv2/trunk@304 3ecf2c5c-341e-0410-92b4-d18e462d057c

src/backend/history.hh

@@ -0,0 +1,71 @@
+// src/backend/history.hh - Copyright 2005, 2006, University
+//               of Padova, dept. of Pure and Applied
+//               Mathematics
+//
+// This file is part of SGPEMv2.
+//
+// This 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.
+//
+// SGPEMv2 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 SGPEMv2; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+
+#ifndef HISTORY_HH
+#define HISTORY_HH 1
+
+#include "config.h"
+
+#include <vector>
+#include <iostream>
+
+#include "slice.hh"
+#include "observedSubject.hh"
+#include "simulationStatus.hh"
+#include "schedulableStatus.hh"
+#include "../templates/smartp.hh"
+
+namespace sgpem
+{
+
+/**	\brief Manages the history of the simulation 
+	
+	Manages the history of the simulation from the instant 0 to the current time,
+	i.e. permits to know the state of each schedulable object inside this time interval.
+	In particoular it's possible to know which entity was running at a precise moment.
+	
+	In a future iteration it will be possible to revert the entire simulation to a state
+	present in the history ("undo operation")
+ 
+*/
+	class History;
+	
+	class SG_DLLEXPORT History : public ObservedSubject {
+	public:
+				
+		memory::smart_ptr<const sgpem::SchedulableStatus>	getScheduledAt (int time);
+		memory::smart_ptr<const sgpem::SimulationStatus> 	getSimulationStatusAt (int time);
+		int  								getCurrentTime();
+		void								enqueueSlice (sgpem::SimulationStatus status);	
+		void 								truncateAt (int instant);
+		
+		static History&  					getInstance();
+			
+	private:
+		History(int);					//private constructor. The parameter is discarded
+		static History 				_instance;
+		int 						_total_time_elapsed;
+		std::vector<sgpem::Slice>	_slices;
+	};
+	
+}
+
+#endif //HISTORY_H
+