- updated PoliciesGatekeeper to reflect change in design, it is still not usable at this time

git-svn-id: svn://svn.gna.org/svn/sgpemv2/trunk@616 3ecf2c5c-341e-0410-92b4-d18e462d057c

Makefile.am

@@ -143,6 +143,7 @@ src_backend_libbackend_la_SOURCES = \
 		src/backend/global_settings.cc \
 		src/backend/history.cc \
 		src/backend/observed_subject.cc \
+		src/backend/policies_gatekeeper.cc \
 		src/backend/policy.cc \
 		src/backend/policy_manager.cc \
 		src/backend/policy_parameters.cc \
@@ -161,6 +162,7 @@ pkginclude_HEADERS = \
 		src/backend/history.hh \
 		src/backend/observed_subject.hh \
 		src/backend/plugin.hh \
+		src/backend/policies_gatekeeper.hh \
 		src/backend/policy.hh \
 		src/backend/policy_manager.hh \
 		src/backend/policy_parameters.hh \

plugins/pyloader/src/python_policy.hh

@@ -76,6 +76,16 @@ namespace sgpem
 
     policy_sorts_type		wants() const throw(UserInterruptException);
 
+    void activate()
+    {
+      //FIXME write code for me
+    }
+
+    void deactivate()
+    {
+      //FIXME write code for me
+    }
+
   private:
     PythonPolicy(const PythonPolicy&);
     PythonPolicy& operator=(const PythonPolicy&);

plugins/pyloader/src/python_policy_manager.hh

@@ -58,6 +58,12 @@ namespace sgpem
      */
     void init();
 
+    std::vector<Policy*> get_avail_policies()
+    {
+      //FIXME write code for me
+      return std::vector<Policy*>();
+    }
+
       /** \brief Returns the singleton instance of 
        * PythonPolicyManager.
        * 

src/backend/policies_gatekeeper.cc

@@ -19,12 +19,21 @@
 // Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 
 #include "policies_gatekeeper.hh"
+#include "policy_manager.hh"
+#include "policy.hh"
+
 #include <algorithm>
 #include <cassert>
 
 using std::vector;
+using std::map;
+using std::find;
+using std::runtime_error;
 using namespace sgpem;
 
+typedef vector<PolicyManager*>::iterator ManagerIterator;
+typedef map<History*, Policy*>::iterator ActiveIterator;
+
 PoliciesGatekeeper* PoliciesGatekeeper::_instance = NULL;
 
 PoliciesGatekeeper&
@@ -44,11 +53,9 @@ PoliciesGatekeeper::get_registered() const
 void
 PoliciesGatekeeper::register_manager(PolicyManager* manager)
 {
-  using std::find;
-  
   assert(manager != NULL);
   
-  end = _registered.end();
+  ManagerIterator end = _registered.end();
 
   if(find(_registered.begin(), end, manager) != end)
     _registered.push_back(manager);
@@ -57,31 +64,78 @@ PoliciesGatekeeper::register_manager(PolicyManager* manager)
 void
 PoliciesGatekeeper::unregister_manager(PolicyManager* manager)
 {
-  using std::find;
-  
   assert(manager != NULL);
   
-  end = _registered.end();
+  ManagerIterator end = _registered.end();
-  pos = find(_registered.begin(), end, manager);
+  ManagerIterator pos = find(_registered.begin(), end, manager);
 
   if(pos != end)
+  {
+    deactivate_policies(*pos);
     _registered.erase(pos);
+  }
 }
 
 Policy*
-PoliciesGatekeeper::get_current_policy()
+PoliciesGatekeeper::get_current_policy(History* history) throw(runtime_error)
 {
-  return _cur_policy;
+  assert(history != NULL);
+
+  ActiveIterator 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
-PoliciesGatekeeper::activate_policy(Policy* policy)
+PoliciesGatekeeper::activate_policy(History *history, Policy* policy)
 {
-  _cur_policy = policy;
+  assert(history != NULL && policy != NULL);
+
+  ActiveIterator end = _active_policies.end();
+  ActiveIterator pos = _active_policies.find(history);
+
+  if(pos != end && pos->second != policy)
+    _active_policies[history]->deactivate();
+
+  if(pos == end || pos->second != policy)
+  {
+    _active_policies[history] = policy;
+    _active_policies[history]->activate();
+  }
 }
 
-PoliciesGatekeeper::PoliciesGatekeeper() :
+PoliciesGatekeeper::PoliciesGatekeeper()
-  _cur_policy(NULL)
 {
 }
 
+void 
+PoliciesGatekeeper::deactivate_policies(PolicyManager* manager)
+{
+  typedef vector<Policy*>::iterator PolicyIterator;
+  
+  vector<Policy*> avail_policies = manager->get_avail_policies();
+  
+  PolicyIterator avail_it = avail_policies.begin();
+  PolicyIterator avail_end = avail_policies.end();
+
+  for(; avail_it != avail_end; ++avail_it)
+  {
+    // TODO isn't there a way to write more compact code by using 
+    // library utilities? 
+    ActiveIterator act_it = _active_policies.begin();
+  
+    for(; act_it != _active_policies.end(); ++act_it)
+    {
+      if(act_it->second == *avail_it)
+      {
+	act_it->second->deactivate();
+	_active_policies.erase(act_it);
+      }
+    }
+  }
+}
+    

src/backend/policies_gatekeeper.hh

@@ -25,11 +25,14 @@ namespace sgpem
 {
   class PolicyManager;
   class Policy;
+  class History;
 }
 
 #include "config.h"
 
 #include <vector>
+#include <map>
+#include <stdexcept>
 
 namespace sgpem
 {
@@ -51,25 +54,23 @@ namespace sgpem
 
     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();
+    Policy*			    get_current_policy(History* history) throw(std::runtime_error);
 
-    void			    activate_policy(Policy* policy);
+    void			    activate_policy(History* history, Policy* policy);
     
   private:
-    PoliciesGatekeeper();					//private constructor.
+    PoliciesGatekeeper();	    //private constructor.
+    
+    // Deactivates active policies managed by the specified manager.
+    void			    deactivate_policies(PolicyManager* manager);
+    
     static PoliciesGatekeeper*      _instance;
     std::vector<PolicyManager*>	    _registered;
-    Policy* _cur_policy;
+    std::map<History*, Policy*>	    _active_policies;
   };
 
 }//~ namespace sgpem

src/backend/policy.hh

@@ -113,6 +113,10 @@ namespace sgpem
 		 */
  		virtual policy_sorts_type wants() const throw(UserInterruptException) = 0;
 
+		virtual void activate() = 0;
+
+		virtual void deactivate() = 0;
+ 
 		/**
 		  Gets the parameters related with this policy.
 

src/backend/policy_manager.hh

@@ -61,6 +61,8 @@ namespace sgpem
 	 */
 	virtual void		init() = 0;
 
+	virtual std::vector<Policy*> get_avail_policies() = 0;
+
 	/** \brief Get the registered manager instance
 	 *
 	 * \return The registered policy manager instance.