Core/Spells: rework part 4: iterate over effects first

Ref #18395

Implement far spell queue processing
Closes #7395

(cherry picked from commit 080d2c6cd439acb2059adc4e24a279de98aa0db6)

2 files changed, 20 insertions, 0 deletions

diff --git a/src/server/game/Maps/Map.cpp b/src/server/game/Maps/Map.cpp
index fc2c950b57c..81578dbc41a 100644
--- a/src/server/game/Maps/Map.cpp
+++ b/src/server/game/Maps/Map.cpp
@@ -3534,8 +3534,22 @@ bool Map::IsSpawnGroupActive(uint32 groupId) const
     return (_toggledSpawnGroupIds.find(groupId) != _toggledSpawnGroupIds.end()) != !(data->flags & SPAWNGROUP_FLAG_MANUAL_SPAWN);
 }
 
+void Map::AddFarSpellCallback(FarSpellCallback&& callback)
+{
+    _farSpellCallbacks.Enqueue(new FarSpellCallback(std::move(callback)));
+}
+
 void Map::DelayedUpdate(uint32 t_diff)
 {
+    {
+        FarSpellCallback* callback;
+        while (_farSpellCallbacks.Dequeue(callback))
+        {
+            (*callback)(this);
+            delete callback;
+        }
+    }
+
     for (_transportsUpdateIter = _transports.begin(); _transportsUpdateIter != _transports.end();)
     {
         Transport* transport = *_transportsUpdateIter;
diff --git a/src/server/game/Maps/Map.h b/src/server/game/Maps/Map.h
index 3362670dbb3..44c46c9219c 100644
--- a/src/server/game/Maps/Map.h
+++ b/src/server/game/Maps/Map.h
@@ -27,6 +27,7 @@
 #include "GridRefManager.h"
 #include "MapDefines.h"
 #include "MapRefManager.h"
+#include "MPSCQueue.h"
 #include "ObjectGuid.h"
 #include "Optional.h"
 #include "SharedDefines.h"
@@ -775,6 +776,9 @@ class TC_GAME_API Map : public GridRefManager<NGridType>
         // This will not affect any already-present creatures in the group
         void SetSpawnGroupInactive(uint32 groupId) { SetSpawnGroupActive(groupId, false); }
 
+        typedef std::function<void(Map*)> FarSpellCallback;
+        void AddFarSpellCallback(FarSpellCallback&& callback);
+
     private:
         // Type specific code for add/remove to/from grid
         template<class T>
@@ -839,6 +843,8 @@ class TC_GAME_API Map : public GridRefManager<NGridType>
         std::unordered_set<Corpse*> _corpseBones;
 
         std::unordered_set<Object*> _updateObjects;
+
+        MPSCQueue<FarSpellCallback> _farSpellCallbacks;
 };
 
 enum InstanceResetMethod