Changed Slot in RelayNode to ProxySlot;

Changed PullData and PushData from SlotExtension to ISlot;

Added BackTraceExecutableNode;

Removed IExecutable from RelayNode;

Runtime/Attributes/ISlot.cs

@@ -1,29 +1,45 @@
-using System.Collections.Generic;
+using System;
+using System.Collections.Generic;
 
 namespace Misaki.GraphView
 {
     public interface ISlot
     {
+        /// <summary>
+        /// The slot data.
+        /// </summary>
         public SlotData SlotData
         {
             get;
         }
 
+        /// <summary>
+        /// The linked slot datas.
+        /// </summary>
         public List<SlotData> LinkedSlotDatas
         {
             get;
         }
 
+        /// <summary>
+        /// Is the slot linked with another slot.
+        /// </summary>
         public bool IsLinked
         {
             get;
         }
 
+        /// <summary>
+        /// The owner of the slot.
+        /// </summary>
         public DataNode Owner
         {
             get;
         }
 
+        /// <summary>
+        /// The data buffer of the slot.
+        /// </summary>
         public object Data
         {
             get;
@@ -43,6 +59,18 @@ namespace Misaki.GraphView
         /// <param name="other"> <see cref="ISlot"/> The slot need to be unlinked </param>
         public void Unlink(ISlot other);
 
+        /// <summary>
+        /// Pull data from the linked slot to current slot.
+        /// </summary>
+        /// <param name="OnPullData">The action to execute when pulling data.</param>
+        public void PullData(Action<ISlot> OnPullData);
+
+        /// <summary>
+        /// Push data from the current slot to linked slot.
+        /// </summary>
+        /// <param name="OnPushData">The action to execute when pushing data.</param>
+        public void PushData(Action<ISlot> OnPushData);
+
         /// <summary>
         /// Send data to the slot.
         /// </summary>