- Added PoliciesGatekeeper class, but still not integrated it with the rest of the code

git-svn-id: svn://svn.gna.org/svn/sgpemv2/trunk@610 3ecf2c5c-341e-0410-92b4-d18e462d057c

src/backend/policies_gatekeeper.cc

@@ -0,0 +1,87 @@
+// src/backend/policies_gatekeeper.cc - 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
+
+#include "policies_gatekeeper.hh"
+#include <algorithm>
+#include <cassert>
+
+using std::vector;
+using namespace sgpem;
+
+PoliciesGatekeeper* PoliciesGatekeeper::_instance = NULL;
+
+PoliciesGatekeeper&
+PoliciesGatekeeper::get_instance()
+{
+  if(!_instance)
+    _instance = new PoliciesGatekeeper();
+  return *_instance;
+}
+
+vector<PolicyManager*>
+PoliciesGatekeeper::get_registered() const
+{
+  return _registered;
+}
+
+void
+PoliciesGatekeeper::register_manager(PolicyManager* manager)
+{
+  using std::find;
+  
+  assert(manager != NULL);
+  
+  end = _registered.end();
+
+  if(find(_registered.begin(), end, manager) != end)
+    _registered.push_back(manager);
+}
+
+void
+PoliciesGatekeeper::unregister_manager(PolicyManager* manager)
+{
+  using std::find;
+  
+  assert(manager != NULL);
+  
+  end = _registered.end();
+  pos = find(_registered.begin(), end, manager);
+
+  if(pos != end)
+    _registered.erase(pos);
+}
+
+Policy*
+PoliciesGatekeeper::get_current_policy()
+{
+  return _cur_policy;
+}
+
+void
+PoliciesGatekeeper::activate_policy(Policy* policy)
+{
+  _cur_policy = policy;
+}
+
+PoliciesGatekeeper::PoliciesGatekeeper() :
+  _cur_policy(NULL)
+{
+}
+

src/backend/policies_gatekeeper.hh

@@ -0,0 +1,78 @@
+// src/backend/policies_gatekeeper.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 POLICIES_GATEKEEPER_HH
+#define POLICIES_GATEKEEPER_HH 1
+
+namespace sgpem
+{
+  class PolicyManager;
+  class Policy;
+}
+
+#include "config.h"
+
+#include <vector>
+
+namespace sgpem
+{
+  class PoliciesGatekeeper;
+
+  /**	\brief FIXME document me 
+
+
+   */
+
+  class PoliciesGatekeeper
+  {
+  public:
+    /** \brief Returns the unique instance of this class, conforming to the Singleton pattern.
+     * 
+     * \return the unique instance of this class, conforming to the Singleton pattern.
+     */
+    static PoliciesGatekeeper&	    get_instance();
+
+    std::vector<PolicyManager*>	    get_registered() const;
+
+    /** FIXME what to do when the manager was already registered? should we throw an exception?
+     *
+     */
+    void			    register_manager(PolicyManager* manager);
+
+    /** FIXME what to do when the manager wasn't already registered? should we throw an exception?
+     *
+     */
+    void			    unregister_manager(PolicyManager* manager);
+
+    Policy*			    get_current_policy();
+
+    void			    activate_policy(Policy* policy);
+    
+  private:
+    PoliciesGatekeeper();					//private constructor.
+    static PoliciesGatekeeper*      _instance;
+    std::vector<PolicyManager*>	    _registered;
+    Policy* _cur_policy;
+  };
+
+}//~ namespace sgpem
+
+#endif //POLICIES_GATEKEEPER_HH
+