Changeset 5877 for code/branches/core5/src/libraries/util/Scope.h

Timestamp:

Oct 5, 2009, 1:34:10 AM (15 years ago)

Author:

rgrieder

Message:

Added new an option for the ScopedSingletonManager that can allow the Singleton to fail (throw an exception).
Also improved exception-safety in Scope so that when for a Singleton fails, the Scope will deactivate all activated listeners and properly destroy itself.

File:

• code/branches/core5/src/libraries/util/Scope.h (modified) (5 diffs)

code/branches/core5/src/libraries/util/Scope.h

@@ -35 +35 @@
 #include <map>
 #include <set>
+
 #include "Debug.h"
+#include "ScopeGuard.h"
 
 namespace orxonox
@@ -63 +65 @@
         protected:
             //! Constructor: Registers the instance.
-            ScopeListener(ScopeID::Value scope) : scope_(scope)
+            ScopeListener(ScopeID::Value scope) : scope_(scope), bActivated_(false)
                 { ScopeManager::listeners_s[this->scope_].insert(this); }
             //! Destructor: Unregisters the instance.
@@ -76 +78 @@
         private:
             ScopeID::Value scope_; //!< Store the scope to unregister on destruction
+            bool bActivated_;
     };
 
@@ -91 +94 @@
             Scope()
             {
-                ScopeManager::instanceCounts_s[scope]++;
-                assert(ScopeManager::instanceCounts_s[scope] > 0);
-                if (ScopeManager::instanceCounts_s[scope] == 1)
+                try
                 {
-                    for (typename std::set<ScopeListener*>::iterator it = ScopeManager::listeners_s[scope].begin(); it != ScopeManager::listeners_s[scope].end(); )
-                        (*(it++))->activated();
+                    ScopeManager::instanceCounts_s[scope]++;
+                    assert(ScopeManager::instanceCounts_s[scope] > 0);
+                    if (ScopeManager::instanceCounts_s[scope] == 1)
+                    {
+                        Loki::ScopeGuard deactivator = Loki::MakeObjGuard(*this, &Scope::deactivateListeners);
+                        for (typename std::set<ScopeListener*>::iterator it = ScopeManager::listeners_s[scope].begin(); it != ScopeManager::listeners_s[scope].end(); )
+                        {
+                            (*it)->activated();
+                            (*(it++))->bActivated_ = true;
+                        }
+                        deactivator.Dismiss();
+                    }
+                }
+                catch (...)
+                {
+                    ScopeManager::instanceCounts_s[scope]--;
+                    throw;
                 }
             }
@@ -111 +127 @@
 
                 if (ScopeManager::instanceCounts_s[scope] == 0)
+                    this->deactivateListeners();
+            }
+
+            void deactivateListeners()
+            {
+                for (typename std::set<ScopeListener*>::iterator it = ScopeManager::listeners_s[scope].begin(); it != ScopeManager::listeners_s[scope].end(); )
                 {
-                    for (typename std::set<ScopeListener*>::iterator it = ScopeManager::listeners_s[scope].begin(); it != ScopeManager::listeners_s[scope].end(); )
-                        (*(it++))->deactivated();
+                    if ((*it)->bActivated_)
+                    {
+                        try
+                            { (*it)->deactivated(); }
+                        catch (...)
+                            { COUT(0) << "ScopeListener::deactivated() failed! This MUST NOT happen, fix it!" << std::endl; }
+                        (*(it++))->bActivated_ = false;
+                    }
+                    else
+                        ++it;
                 }
             }