- Added the ResourcePoliciesGatekeeper class, still not tried to compile it

git-svn-id: svn://svn.gna.org/svn/sgpemv2/trunk@813 3ecf2c5c-341e-0410-92b4-d18e462d057c

src/backend/resource_policies_gatekeeper.cc

@@ -0,0 +1,127 @@
+// src/backend/resource_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 "config.h"
+
+#include "resource_policies_gatekeeper.hh"
+#include "resource_policy_manager.hh"
+#include "resource_policy.hh"
+
+// Include full template definition only in implementation files:
+#include "singleton.tcc"
+
+#include <algorithm>
+#include <cassert>
+
+using std::vector;
+using std::map;
+using std::find;
+using std::runtime_error;
+using namespace sgpem;
+
+// Explicit template instantiation to allow to export symbols from the DSO.
+template class SG_DLLEXPORT Singleton<ResourcePoliciesGatekeeper>;
+
+typedef vector<ResourcePolicyManager*>::iterator ManagerIterator;
+typedef map<History*, Policy*>::iterator PolicyIterator;
+
+const vector<ResourcePolicyManager*>&
+ResourcePoliciesGatekeeper::get_registered() const
+{
+  return _registered;
+}
+
+void
+ResourcePoliciesGatekeeper::register_manager(ResourcePolicyManager* manager)
+{
+  assert(manager != NULL);
+
+  ManagerIterator end = _registered.end();
+
+  if(find(_registered.begin(), end, manager) == end)
+    _registered.push_back(manager);
+}
+
+void
+ResourcePoliciesGatekeeper::unregister_manager(PolicyManager* manager)
+{
+  assert(manager != NULL);
+
+  ManagerIterator end = _registered.end();
+  ManagerIterator pos = find(_registered.begin(), end, manager);
+
+  if(pos != end)
+  {
+    deactivate_policies(**pos);
+    _registered.erase(pos);
+  }
+}
+
+ResourcePolicy&
+ResourcePoliciesGatekeeper::get_current_policy(History* history) throw(runtime_error)
+{
+  assert(history != NULL);
+
+  PolicyIterator policy = _active_policies.find(history);
+
+  if(policy == _active_policies.end())
+    throw runtime_error("No active policy associated with this "
+                        "history is available.");
+
+  return *policy->second;
+}
+
+void
+ResourcePoliciesGatekeeper::set_current_policy(History *history, ResourcePolicy* policy)
+{
+  assert(history != NULL && policy != NULL);
+
+  _active_policies[history] = policy;
+}
+
+ResourcePoliciesGatekeeper::ResourcePoliciesGatekeeper()
+{
+}
+
+void
+ResourcePoliciesGatekeeper::deactivate_policies(const ResourcePolicyManager& manager)
+{
+  typedef vector<ResourcePolicy*>::const_iterator AvailableIt;
+
+  const vector<ResourcePolicy*>& policies = manager.get_avail_policies();
+
+  for(AvailableIt avail_it = policies.begin(); avail_it != policies.end(); ++avail_it)
+  {
+    // TODO isn't there a way to write more compact code by using
+    // library utilities?
+    for(PolicyIterator it = _active_policies.begin(); it != _active_policies.end();)
+    {
+      // FIXME Is this necessary? It just came across my mind the idea that 
+      // incrementing an invalid iterator might be unsafe...
+      PolicyIterator next = it; ++next;
+      
+      if(it->second == *avail_it)
+	_active_policies.erase(it);
+
+      it = next;
+    }
+  } //~ for(avail_it)
+}
+

src/backend/resource_policies_gatekeeper.hh

@@ -0,0 +1,79 @@
+// src/backend/resource_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 RESOURCE_POLICIES_GATEKEEPER_HH
+#define RESOURCE_POLICIES_GATEKEEPER_HH 1
+
+namespace sgpem
+{
+  class ResourcePolicyManager;
+  class ResourcePolicy;
+  class History;
+}
+
+#include "config.h"
+
+#include <vector>
+#include <map>
+#include <stdexcept>
+
+#include "singleton.hh"
+
+namespace sgpem
+{
+  class ResourcePoliciesGatekeeper;
+
+  /** \brief FIXME document me
+
+
+   */
+
+  class SG_DLLEXPORT ResourcePoliciesGatekeeper : public Singleton<ResourcePoliciesGatekeeper>
+  {
+    friend class Singleton<ResourcePoliciesGatekeeper>;
+
+  public:
+    typedef std::vector<ResourcePolicyManager*> Managers;
+    
+    const Managers&   get_registered() const;
+
+    void	      register_manager(ResourcePolicyManager* manager);
+
+    void	      unregister_manager(ResourcePolicyManager* manager);
+
+    ResourcePolicy&   get_current_policy(History* history) throw(std::runtime_error);
+
+    void	      activate_policy(History* history, ResourcePolicy* policy);
+
+  private:
+    ResourcePoliciesGatekeeper();     //private constructor.
+    ResourcePoliciesGatekeeper(const ResourcePoliciesGatekeeper&);
+    ResourcePoliciesGatekeeper& operator=(const ResourcePoliciesGatekeeper&);
+    
+    void deactivate_policies(const ResourcePolicyManager& manager);
+
+    std::vector<ResourcePolicyManager*>     _registered;
+    std::map<History*, ResourcePolicy*>	    _active_policies;
+  };
+
+}//~ namespace sgpem
+
+#endif //RESOURCE_POLICIES_GATEKEEPER_HH
+