update/add component count/auto delete empty entity

src/Builtin/InjectSystem.cs

@@ -138,38 +138,35 @@ namespace DCFApixels.DragonECS
     {
         public static EcsPipeline.Builder Inject<T>(this EcsPipeline.Builder self, T data)
         {
-            self.Add(new InjectSystem<T>(data));
-            return self;
+            return self.Add(new InjectSystem<T>(data));
         }
         public static EcsPipeline.Builder Inject<A, B>(this EcsPipeline.Builder self, A a, B b)
         {
-            self.Inject(a).Inject(b);
-            return self;
+            return self.Inject(a).Inject(b);
+        }
+        public static EcsPipeline.Builder Inject<A, B, C>(this EcsPipeline.Builder self, A a, B b, C c)
+        {
+            return self.Inject(a).Inject(b).Inject(c);
         }
         public static EcsPipeline.Builder Inject<A, B, C, D>(this EcsPipeline.Builder self, A a, B b, C c, D d)
         {
-            self.Inject(a).Inject(b).Inject(c).Inject(d);
-            return self;
+            return self.Inject(a).Inject(b).Inject(c).Inject(d);
         }
         public static EcsPipeline.Builder Inject<A, B, C, D, E>(this EcsPipeline.Builder self, A a, B b, C c, D d, E e)
         {
-            self.Inject(a).Inject(b).Inject(c).Inject(d).Inject(e);
-            return self;
+            return self.Inject(a).Inject(b).Inject(c).Inject(d).Inject(e);
         }
         public static EcsPipeline.Builder Inject<A, B, C, D, E, F>(this EcsPipeline.Builder self, A a, B b, C c, D d, E e, F f)
         {
-            self.Inject(a).Inject(b).Inject(c).Inject(d).Inject(e).Inject(f);
-            return self;
+            return self.Inject(a).Inject(b).Inject(c).Inject(d).Inject(e).Inject(f);
         }
         public static EcsPipeline.Builder Inject<A, B, C, D, E, F, G>(this EcsPipeline.Builder self, A a, B b, C c, D d, E e, F f, G g)
         {
-            self.Inject(a).Inject(b).Inject(c).Inject(d).Inject(e).Inject(f).Inject(g);
-            return self;
+            return self.Inject(a).Inject(b).Inject(c).Inject(d).Inject(e).Inject(f).Inject(g);
         }
         public static EcsPipeline.Builder Inject<A, B, C, D, E, F, G, H>(this EcsPipeline.Builder self, A a, B b, C c, D d, E e, F f, G g, H h)
         {
-            self.Inject(a).Inject(b).Inject(c).Inject(d).Inject(e).Inject(f).Inject(g).Inject(h);
-            return self;
+            return self.Inject(a).Inject(b).Inject(c).Inject(d).Inject(e).Inject(f).Inject(g).Inject(h);
         }
     }
 }

src/Builtin/Systems.cs

@@ -1,4 +1,6 @@
-namespace DCFApixels.DragonECS
+using System.Collections.Generic;
+
+namespace DCFApixels.DragonECS
 {
     [DebugColor(DebugColor.Black)]
     public class SystemsBlockMarkerSystem : IEcsSystem
@@ -10,4 +12,60 @@
             this.name = name;
         }
     }
+    [DebugHide, DebugColor(DebugColor.Grey)]
+    public class DeleteEmptyEntitesSsytem : IEcsRunSystem, IEcsPreInject
+    {
+        private List<EcsWorld> _worlds = new List<EcsWorld>();
+        public void PreInject(object obj)
+        {
+            if (obj is EcsWorld world)
+                _worlds.Add(world);
+        }
+
+        public void Run(EcsPipeline pipeline)
+        {
+            foreach (var world in _worlds)
+                world.DeleteEmptyEntites();
+        }
+    }
+
+    public class DeleteOneFrameComponentSystem<TWorld, TComponent> : IEcsRunSystem, IEcsInject<TWorld>
+        where TWorld : EcsWorld<TWorld>
+        where TComponent : struct, IEcsComponent
+    {
+        private TWorld _world;
+        public void Inject(TWorld obj) => _world = obj;
+
+        private sealed class Query : EcsQuery
+        {
+            public EcsPool<TComponent> pool;
+            public Query(Builder b)
+            {
+                pool = b.Include<TComponent>();
+            }
+        }
+        public void Run(EcsPipeline pipeline)
+        {
+            foreach (var e in _world.Where(out Query q))
+                q.pool.Del(e);
+        }
+    }
+
+    public static class DeleteOneFrameComponentSystemExt
+    {
+        public static EcsPipeline.Builder AutoDel<TWorld, TComponent>(this EcsPipeline.Builder b)
+            where TWorld : EcsWorld<TWorld>
+            where TComponent : struct, IEcsComponent
+        {
+            b.Add(new DeleteOneFrameComponentSystem<TWorld, TComponent>());
+            return b;
+        }
+        /// <summary> for EcsDefaultWorld </summary>
+        public static EcsPipeline.Builder AutoDel<TComponent>(this EcsPipeline.Builder b)
+            where TComponent : struct, IEcsComponent
+        {
+            b.Add(new DeleteOneFrameComponentSystem<EcsDefaultWorld, TComponent>());
+            return b;
+        }
+    }
 }

src/Builtin/WorldRunners.cs

@@ -50,7 +50,7 @@ namespace DCFApixels.DragonECS
     }
     public interface IEcsEntityDestroy : IEcsSystem
     {
-        public void OnEntityDestroy(EcsEntity entity);
+        public void OnEntityDestroy(int entityID);
     }
     public interface IEcsEntityLifecycle : IEcsEntityCreate, IEcsEntityDestroy { }
 
@@ -67,9 +67,9 @@ namespace DCFApixels.DragonECS
         [DebugColor(DebugColor.Orange)]
         public sealed class EcsEntityDestroyRunner : EcsRunner<IEcsEntityDestroy>, IEcsEntityDestroy
         {
-            public void OnEntityDestroy(EcsEntity entity)
+            public void OnEntityDestroy(int entityID)
             {
-                foreach (var item in targets) item.OnEntityDestroy(entity);
+                foreach (var item in targets) item.OnEntityDestroy(entityID);
             }
         }
     }

src/Builtin/Worlds.cs

@@ -9,14 +9,17 @@
 
     public sealed class EcsDefaultWorld : EcsWorld<EcsDefaultWorld>
     {
-        public EcsDefaultWorld(EcsPipeline pipeline = null) : base(pipeline) { }
+        public EcsDefaultWorld() : base(null) { }
+        public EcsDefaultWorld(EcsPipeline pipeline) : base(pipeline) { }
     }
     public sealed class EcsEventWorld : EcsWorld<EcsEventWorld>
     {
-        public EcsEventWorld(EcsPipeline pipeline = null) : base(pipeline) { }
+        public EcsEventWorld() : base(null) { }
+        public EcsEventWorld(EcsPipeline pipeline) : base(pipeline) { }
     }
     public sealed class EcsUIWorld : EcsWorld<EcsUIWorld>
     {
-        public EcsUIWorld(EcsPipeline pipeline = null) : base(pipeline) { }
+        public EcsUIWorld() : base(null) { }
+        public EcsUIWorld(EcsPipeline pipeline) : base(pipeline) { }
     }
 }

src/Consts.cs

@@ -6,5 +6,12 @@
         public const string DEBUG_PREFIX = "[DEBUG] ";
         public const string DEBUG_WARNING_TAG = "WARNING";
         public const string DEBUG_ERROR_TAG = "ERROR";
+
+
+        public const string PRE_BEGIN_SYSTEMS_BLOCK = nameof(PRE_BEGIN_SYSTEMS_BLOCK);
+        public const string BEGIN_SYSTEMS_BLOCK = nameof(BEGIN_SYSTEMS_BLOCK);
+        public const string BASIC_SYSTEMS_BLOCK = nameof(BASIC_SYSTEMS_BLOCK);
+        public const string END_SYSTEMS_BLOCK = nameof(END_SYSTEMS_BLOCK);
+        public const string POST_END_SYSTEMS_BLOCK = nameof(POST_END_SYSTEMS_BLOCK);
     }
 }

src/EcsGroup.cs

@@ -463,6 +463,8 @@ namespace DCFApixels.DragonECS
         public bool Equals(EcsReadonlyGroup other) => Equals(other.GetGroupInternal());
         public bool Equals(EcsGroup other)
         {
+            if (ReferenceEquals(other, null))
+                return false;
             if (other.Count != Count)
                 return false;
             foreach (var item in other)
@@ -480,10 +482,17 @@ namespace DCFApixels.DragonECS
         #endregion
 
         #region operators
-        public static bool operator ==(EcsGroup a, EcsGroup b) => a.Equals(b);
-        public static bool operator ==(EcsGroup a, EcsReadonlyGroup b) => a.Equals(b);
-        public static bool operator !=(EcsGroup a, EcsGroup b) => !a.Equals(b);
-        public static bool operator !=(EcsGroup a, EcsReadonlyGroup b) => !a.Equals(b);
+        private static bool StaticEquals(EcsGroup a, EcsReadonlyGroup b) => StaticEquals(a, b.GetGroupInternal());
+        private static bool StaticEquals(EcsGroup a, EcsGroup b)
+        {
+            if (ReferenceEquals(a, null))
+                return false;
+            return a.Equals(b);
+        }
+        public static bool operator ==(EcsGroup a, EcsGroup b) => StaticEquals(a, b);
+        public static bool operator ==(EcsGroup a, EcsReadonlyGroup b) => StaticEquals(a, b);
+        public static bool operator !=(EcsGroup a, EcsGroup b) => !StaticEquals(a, b);
+        public static bool operator !=(EcsGroup a, EcsReadonlyGroup b) => !StaticEquals(a, b);
         #endregion
 
         #region OnWorldResize

src/EcsJoinQuery.cs

@@ -174,6 +174,10 @@ namespace DCFApixels.DragonECS
             }
         }
 
+    //TODO 
+    // реализовать возможность получить список всех связей между двумя сущьностями одной напрваленности, и сделать метод для получения одной такой связи
+    //
+
         public void Join(WhereResult firstWorldWhereQuery, WhereResult secondWorldWhereQuery)
         {
             _executeJoin.Begin();

src/EcsPipeline.cs

@@ -157,17 +157,20 @@ namespace DCFApixels.DragonECS
             private HashSet<Type> _uniqueTypes;
             private readonly List<object> _blockExecutionOrder;
             private readonly Dictionary<object, List<IEcsSystem>> _systems;
-            private readonly object _basicBlocKey;
+            private readonly string _basicBlocKey;
             private bool _isBasicBlockDeclared;
             private bool _isOnlyBasicBlock;
             public Builder()
             {
-                _basicBlocKey = "Basic";
+                _basicBlocKey = EcsConsts.BASIC_SYSTEMS_BLOCK;
                 _uniqueTypes = new HashSet<Type>();
                 _blockExecutionOrder = new List<object>(KEYS_CAPACITY);
                 _systems = new Dictionary<object, List<IEcsSystem>>(KEYS_CAPACITY);
                 _isBasicBlockDeclared = false;
                 _isOnlyBasicBlock = true;
+
+                SystemsBlock(EcsConsts.PRE_BEGIN_SYSTEMS_BLOCK);
+                SystemsBlock(EcsConsts.BEGIN_SYSTEMS_BLOCK);
             }
 
             public Builder Add(IEcsSystem system, object blockKey = null)
@@ -196,7 +199,7 @@ namespace DCFApixels.DragonECS
                 list.Add(system);
             }
 
-            public Builder Add(IEcsModule module)
+            public Builder AddModule(IEcsModule module)
             {
                 module.ImportSystems(this);
                 return this;
@@ -208,15 +211,29 @@ namespace DCFApixels.DragonECS
                 _blockExecutionOrder.Add(_basicBlocKey);
                 return this;
             }
-            public Builder SystemsBlock(object blockKey)
+            public Builder SystemsBlock(string blockKey)
             {
-                if (blockKey == null)
+                if (blockKey == null || blockKey == _basicBlocKey)
                     return BasicSystemsBlock();
 
                 _isOnlyBasicBlock = false;
                 _blockExecutionOrder.Add(blockKey);
                 return this;
             }
+            public Builder InsertSystemsBlock(string blockKey, string beforeBlockKey)
+            {
+                if (blockKey == null || blockKey == _basicBlocKey)
+                {
+                    _isBasicBlockDeclared = true;
+                    blockKey = _basicBlocKey;
+                }
+
+                _isOnlyBasicBlock = false;
+                int index = _blockExecutionOrder.IndexOf(beforeBlockKey);
+                index = index < 0 ? _blockExecutionOrder.Count - 1 : index;
+                _blockExecutionOrder.Insert(index, blockKey);
+                return this;
+            }
 
             public EcsPipeline Build()
             {
@@ -226,7 +243,10 @@ namespace DCFApixels.DragonECS
                 }
 
                 if(_isBasicBlockDeclared == false)
-                    _blockExecutionOrder.Insert(0, _basicBlocKey);
+                    _blockExecutionOrder.Insert(_blockExecutionOrder.IndexOf(EcsConsts.BEGIN_SYSTEMS_BLOCK) + 1, _basicBlocKey);//вставить после BEGIN_SYSTEMS_BLOCK
+                SystemsBlock(EcsConsts.END_SYSTEMS_BLOCK);
+                SystemsBlock(EcsConsts.POST_END_SYSTEMS_BLOCK);
+                Add(new DeleteEmptyEntitesSsytem(), EcsConsts.POST_END_SYSTEMS_BLOCK);
 
                 List<IEcsSystem> result = new List<IEcsSystem>(32);
 
@@ -255,12 +275,16 @@ namespace DCFApixels.DragonECS
 
     public interface IEcsModule
     {
-        public void ImportSystems(EcsPipeline.Builder builder);
+        public void ImportSystems(EcsPipeline.Builder b);
     }
 
     #region Extensions
-    public static class EcsSystemsExtensions
+    public static class EcsPipelineExtensions
     {
+        public static void GetRunner<T>(this EcsPipeline self, out T runner) where T : IEcsSystem
+        {
+            runner = self.GetRunner<T>();
+        }
         public static bool IsNullOrDestroyed(this EcsPipeline self)
         {
             return self == null || self.IsDestoryed;

src/EcsWorld.cs

@@ -21,7 +21,7 @@ namespace DCFApixels.DragonECS
         private int _entitiesCount;
         private int _entitesCapacity;
         private short[] _gens; //старший бит указывает на то жива ли сущьность.
-        //private short[] _componentCounts; //TODO
+        private short[] _componentCounts;
         private EcsGroup _allEntites;
 
         //буфер удаления откладывает освобождение андишников сущьностей.
@@ -73,6 +73,8 @@ namespace DCFApixels.DragonECS
             ArrayUtility.Fill(pools, _nullPool);
 
             _gens = new short[_entitesCapacity];
+            _componentCounts = new short[_entitesCapacity];
+
             ArrayUtility.Fill(_gens, DEATH_GEN_BIT);
             _delEntBufferCount = 0;
             _delEntBuffer = new int[_entitesCapacity >> DEL_ENT_BUFFER_SIZE_OFFSET];
@@ -127,6 +129,7 @@ namespace DCFApixels.DragonECS
             {
                 var pool = new TPool();
                 pools[uniqueID] = pool;
+                pool.PreInitInternal(this, uniqueID);
                 pool.InvokeInit(this);
 
                 //EcsDebug.Print(pool.GetType().FullName);
@@ -200,6 +203,7 @@ namespace DCFApixels.DragonECS
             if (_gens.Length <= entityID)
             {
                 Array.Resize(ref _gens, _gens.Length << 1);
+                Array.Resize(ref _componentCounts, _gens.Length);
                 ArrayUtility.Fill(_gens, DEATH_GEN_BIT, _entitesCapacity);
                 _entitesCapacity = _gens.Length;
 
@@ -225,13 +229,14 @@ namespace DCFApixels.DragonECS
             _allEntites.Add(entityID);
             return entity;
         }
-        public void DelEntity(EcsEntity entity)
+
+        public void DelEntity(int entityID)
         {
-            _allEntites.Remove(entity.id);
-            _delEntBuffer[_delEntBufferCount++] = entity.id;
-            _gens[entity.id] |= DEATH_GEN_BIT;
+            _allEntites.Remove(entityID);
+            _delEntBuffer[_delEntBufferCount++] = entityID;
+            _gens[entityID] |= DEATH_GEN_BIT;
             _entitiesCount--;
-            _entityDestry.OnEntityDestroy(entity);
+            _entityDestry.OnEntityDestroy(entityID);
 
             if (_delEntBufferCount >= _delEntBuffer.Length)
                 ReleaseDelEntityBuffer();
@@ -248,6 +253,35 @@ namespace DCFApixels.DragonECS
                 _entityDispenser.Release(_delEntBuffer[i]);
             _delEntBufferCount = 0;
         }
+        public short GetGen(int entityID) => _gens[entityID];
+        public short GetComponentCount(int entityID) => _componentCounts[entityID];
+        public void DeleteEmptyEntites()
+        {
+            foreach (var e in _allEntites)
+            {
+                if (_componentCounts[e] <= 0)
+                    DelEntity(e);
+            }
+        }
+
+
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        internal void IncrementEntityComponentCount(int entityID)
+        {
+            _componentCounts[entityID]++;
+        }
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        internal void DecrementEntityComponentCount(int entityID)
+        {
+            var count = --_componentCounts[entityID];
+            if(count == 0)
+                DelEntity(entityID);
+
+#if (DEBUG && !DISABLE_DRAGONECS_DEBUG) || !DRAGONECS_NO_SANITIZE_CHECKS
+            if (count < 0) throw new EcsFrameworkException("нарушен баланс инкремента.декремента компонентов");
+#endif
+        }
         #endregion
 
         #region Groups

src/Entities/EcsEntity.cs

@@ -93,6 +93,8 @@ namespace DCFApixels.DragonECS
                 return this != NULL;
             }
         }
+
+        public EcsWorld GetWorld() => EcsWorld.Worlds[world];
     } 
 
     public static partial class entExtensions

src/Pools/EcsAttachPool.cs

@@ -4,11 +4,10 @@ using Unity.Profiling;
 
 namespace DCFApixels.DragonECS
 {
+    //не влияет на счетчик компонентов на сущности
     public sealed class EcsAttachPool<T> : EcsPoolBase<T>
         where T : struct, IEcsAttachComponent
     {
-        private EcsWorld _source;
-
         private bool[] _entityFlags;// index = entityID / value = entityFlag;/ value = 0 = no entityID
         private T[] _items; //sparse
         private int _count;
@@ -31,13 +30,11 @@ namespace DCFApixels.DragonECS
         #region Properites
         public int Count => _count;
         public int Capacity => _items.Length;
-        public sealed override EcsWorld World => _source;
         #endregion
 
         #region Init
         protected override void Init(EcsWorld world)
         {
-            _source = world;
             _poolRunners = new PoolRunners(world.Pipeline);
 
             _entities = EcsGroup.New(world);

src/Pools/EcsNotNullPool.cs

@@ -4,11 +4,10 @@ using Unity.Profiling;
 
 namespace DCFApixels.DragonECS
 {
+    //не влияет на счетчик компонентов на сущности
     public sealed class EcsNotNullPool<T> : EcsPoolBase<T>
         where T : struct, INotNullComponent
     {
-        private EcsWorld _source;
-
         private T[] _items; //sparse
         private int _count;
 
@@ -18,14 +17,11 @@ namespace DCFApixels.DragonECS
         #region Properites
         public int Count => _count;
         public int Capacity => _items.Length;
-        public sealed override EcsWorld World => _source;
         #endregion
 
         #region Init
         protected override void Init(EcsWorld world)
         {
-            _source = world;
-
             _items = new T[world.Capacity];
             _count = 0;
 

src/Pools/EcsPool.cs

@@ -6,66 +6,11 @@ using Unity.Profiling;
 
 namespace DCFApixels.DragonECS
 {
-    public abstract class EcsPoolBase
-    {
-        #region Properties
-        public abstract Type ComponentType { get; }
-        public abstract EcsWorld World { get; }
-        #endregion
-
-        #region Methods
-        public abstract bool Has(int entityID);
-
-        protected abstract void Init(EcsWorld world);
-        protected abstract void OnWorldResize(int newSize);
-        protected abstract void OnDestroy();
-        #endregion
-
-        #region Internal
-        internal void InvokeInit(EcsWorld world) => Init(world);
-        internal void InvokeOnWorldResize(int newSize) => OnWorldResize(newSize);
-        internal void InvokeOnDestroy() => OnDestroy();
-        #endregion
-    }
-    public abstract class EcsPoolBase<T> : EcsPoolBase, IEnumerable<T>
-    {
-        public sealed override Type ComponentType => typeof(T);
-        //Ðåëàçèàöèÿ èíòåðôåéñà IEnumerator íå ðàáîòàåò, íóæíî òîëüêî ÷òîáû IntelliSense ïðåäëàãàëà íàçâàíèÿ íà îñíîâå T. Íå íàøåë äðóãîãî ñïîñîáà
-        #region IEnumerable 
-        IEnumerator<T> IEnumerable<T>.GetEnumerator() => throw new NotImplementedException();
-        IEnumerator IEnumerable.GetEnumerator() => throw new NotImplementedException();
-        #endregion
-    }
-
-    public struct NullComponent { }
-    public sealed class EcsNullPool : EcsPoolBase
-    {
-        public static EcsNullPool instance => new EcsNullPool(null);
-        private EcsWorld _source;
-        private EcsNullPool(EcsWorld source) => _source = source;
-
-        #region Properties
-        public sealed override Type ComponentType => typeof(NullComponent);
-        public sealed override EcsWorld World => _source;
-        #endregion
-
-        #region Methods
-        public sealed override bool Has(int index) => false;
-        #endregion
-
-        #region Callbacks
-        protected override void Init(EcsWorld world) { }
-        protected override void OnWorldResize(int newSize) { }
-        protected override void OnDestroy() { }
-        #endregion
-    }
     public sealed class EcsPool<T> : EcsPoolBase<T>
         where T : struct, IEcsComponent
     {
         public static string name = typeof(T).Name; 
 
-        private EcsWorld _source;
-
         private int[] _mapping;// index = entityID / value = itemIndex;/ value = 0 = no entityID
         private T[] _items; //dense
         private int _itemsCount;
@@ -78,14 +23,12 @@ namespace DCFApixels.DragonECS
         #region Properites
         public int Count => _itemsCount;
         public int Capacity => _items.Length;
-        public sealed override EcsWorld World => _source;
         #endregion
 
         #region Init
         protected override void Init(EcsWorld world)
         {
             const int capacity = 512;
-            _source = world;
 
             _mapping = new int[world.Capacity];
             _recycledItems = new int[128];
@@ -124,6 +67,7 @@ namespace DCFApixels.DragonECS
                 }
 
                 //_mapping[entityID] = itemIndex; TODO ïðîâåðèòü ÷òî ýòî ëèøíåå äåéñâèå
+                IncrementEntityComponentCount(entityID);
                 _poolRunners.add.OnComponentAdd<T>(entityID);
             }
             _poolRunners.write.OnComponentWrite<T>(entityID);
@@ -153,6 +97,7 @@ namespace DCFApixels.DragonECS
         {
             //  using (_delMark.Auto())
             //   {
+
             ref int itemIndex = ref _mapping[entityID];
             _componentResetHandler.Reset(ref _items[itemIndex]);
             if (_recycledItemsCount >= _recycledItems.Length)
@@ -160,6 +105,7 @@ namespace DCFApixels.DragonECS
             _recycledItems[_recycledItemsCount++] = itemIndex;
             itemIndex = 0;
             _itemsCount--;
+            DecrementEntityComponentCount(entityID);
             _poolRunners.del.OnComponentDel<T>(entityID);
             //   }
         }

src/Pools/EcsPoolBase.cs

@@ -0,0 +1,77 @@
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Runtime.CompilerServices;
+
+namespace DCFApixels.DragonECS
+{
+    public abstract class EcsPoolBase
+    {
+        private int _id = -1;
+        private EcsWorld _world;
+        internal void PreInitInternal(EcsWorld world, int id)
+        {
+            _id = id;
+            _world = world;
+        }
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        protected void IncrementEntityComponentCount(int entityID)
+        {
+            _world.IncrementEntityComponentCount(entityID);
+        }
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        protected void DecrementEntityComponentCount(int entityID)
+        {
+            _world.DecrementEntityComponentCount(entityID);
+        }
+
+        #region Properties
+        public abstract Type ComponentType { get; }
+        public EcsWorld World => _world;
+        #endregion
+
+        #region Methods
+        public abstract bool Has(int entityID);
+
+        protected abstract void Init(EcsWorld world);
+        protected abstract void OnWorldResize(int newSize);
+        protected abstract void OnDestroy();
+        #endregion
+
+        #region Internal
+        internal void InvokeInit(EcsWorld world) => Init(world);
+        internal void InvokeOnWorldResize(int newSize) => OnWorldResize(newSize);
+        internal void InvokeOnDestroy() => OnDestroy();
+        #endregion
+    }
+    public abstract class EcsPoolBase<T> : EcsPoolBase, IEnumerable<T>
+    {
+        public sealed override Type ComponentType => typeof(T);
+        //Релазиация интерфейса IEnumerator не работает, нужно только чтобы IntelliSense предлагала названия на основе T. Не нашел другого способа
+        #region IEnumerable 
+        IEnumerator<T> IEnumerable<T>.GetEnumerator() => throw new NotImplementedException();
+        IEnumerator IEnumerable.GetEnumerator() => throw new NotImplementedException();
+        #endregion
+    }
+
+    public struct NullComponent { }
+    public sealed class EcsNullPool : EcsPoolBase
+    {
+        public static EcsNullPool instance => new EcsNullPool();
+
+        #region Properties
+        public sealed override Type ComponentType => typeof(NullComponent);
+        #endregion
+
+        #region Methods
+        public sealed override bool Has(int index) => false;
+        #endregion
+
+        #region Callbacks
+        protected override void Init(EcsWorld world) { }
+        protected override void OnWorldResize(int newSize) { }
+        protected override void OnDestroy() { }
+        #endregion
+    }
+}

src/Pools/EcsReadonlyPool.cs

@@ -11,8 +11,6 @@ namespace DCFApixels.DragonECS
     {
         public static string name = typeof(T).Name;
 
-        private EcsWorld _source;
-
         private int[] _mapping;// index = entityID / value = itemIndex;/ value = 0 = no entityID
         private T[] _items; //dense
         private int _itemsCount;
@@ -25,14 +23,12 @@ namespace DCFApixels.DragonECS
         #region Properites
         public int Count => _itemsCount;
         public int Capacity => _items.Length;
-        public sealed override EcsWorld World => _source;
         #endregion
 
         #region Init
         protected override void Init(EcsWorld world)
         {
             const int capacity = 512;
-            _source = world;
 
             _mapping = new int[world.Capacity];
             _recycledItems = new int[128];

src/Pools/EcsRelationPool.cs

@@ -4,11 +4,10 @@ using Unity.Profiling;
 
 namespace DCFApixels.DragonECS
 {
+    //не влияет на счетчик компонентов на сущности
     public sealed class EcsRelationPool<T> : EcsPoolBase<T>
         where T : struct, IEcsRelationComponent
     {
-        private EcsWorld _source;
-
         private bool[] _entityFlags;// index = entityID / value = entityFlag;/ value = 0 = no entityID
         private T[] _items; //sparse
         private int _count;
@@ -25,13 +24,11 @@ namespace DCFApixels.DragonECS
         #region Properites
         public int Count => _count;
         public int Capacity => _items.Length;
-        public sealed override EcsWorld World => _source;
         #endregion
 
         #region Init
         protected override void Init(EcsWorld world)
         {
-            _source = world;
             _poolRunners = new PoolRunners(world.Pipeline);
 
             _entityFlags = new bool[world.Capacity];

src/Pools/EcsSinglePool.cs

@@ -7,13 +7,7 @@ namespace DCFApixels.DragonECS
     public sealed class EcsSinglePool<T> : EcsPoolBase<T>
          where T : struct, IEcsSingleComponent
     {
-        private EcsWorld _source;
-
-        private int[] _mapping;// index = entityID / value = itemIndex;/ value = 0 = no entityID
-        //private T[] _items; //dense
-        //private int _count;
-        //private int[] _recycledItems;
-        //private int _recycledItemsCount;
+        private int[] _mapping;
 
         private int _count;
         private T _component;
@@ -27,13 +21,11 @@ namespace DCFApixels.DragonECS
             get => ref _component;
         }
         public int Count => _count;
-        public sealed override EcsWorld World => _source;
         #endregion
 
         #region Init
         protected override void Init(EcsWorld world)
         {
-            _source = world;
             _mapping = new int[world.Capacity];
             _count = 0;
             _poolRunners = new PoolRunners(world.Pipeline);
@@ -53,6 +45,7 @@ namespace DCFApixels.DragonECS
             if (_mapping[entityID] <= 0)
             {
                 _mapping[entityID] = ++_count;
+                IncrementEntityComponentCount(entityID);
                 _poolRunners.add.OnComponentAdd<T>(entityID);
             }
             return ref _component;
@@ -84,6 +77,7 @@ namespace DCFApixels.DragonECS
             //   {
             _mapping[entityID] = 0;
             _count--;
+            DecrementEntityComponentCount(entityID);
             _poolRunners.del.OnComponentDel<T>(entityID);
             //   }
         }

src/Pools/EcsTagPool.cs

@@ -7,8 +7,6 @@ namespace DCFApixels.DragonECS
     public sealed class EcsTagPool<T> : EcsPoolBase<T>
         where T : struct, IEcsTagComponent
     {
-        private EcsWorld _source;
-
         private bool[] _mapping;// index = entityID / value = itemIndex;/ value = 0 = no entityID
         private int _count;
 
@@ -16,14 +14,11 @@ namespace DCFApixels.DragonECS
 
         #region Properites
         public int Count => _count;
-        public sealed override EcsWorld World => _source;
         #endregion
 
         #region Init
         protected override void Init(EcsWorld world)
         {
-            _source = world;
-
             _mapping = new bool[world.Capacity];
             _count = 0;
 
@@ -43,6 +38,7 @@ namespace DCFApixels.DragonECS
             {
                 _count++;
                 _mapping[entityID] = true;
+                IncrementEntityComponentCount(entityID);
                 _poolRunners.add.OnComponentAdd<T>(entityID);
             }
             // }
@@ -59,6 +55,7 @@ namespace DCFApixels.DragonECS
             //   {
             _mapping[entityID] = false;
             _count--;
+            DecrementEntityComponentCount(entityID);
             _poolRunners.del.OnComponentDel<T>(entityID);
             //   }
         }