Added RelayNodeView;

Chnaged GraphView to multiple files for better organization;

Runtime/Models/Nodes/RelayNode.cs

@@ -1,9 +1,78 @@
-using UnityEngine;
+using System;
 
 namespace Misaki.GraphView
 {
-    public class RelayNode
+    [Serializable]
+    public class RelayNode : DataNode, ISlotContainer, IExecutable
     {
-    
+        private Slot _inputSlot;
+        private Slot _outputSlot;
+
+        private bool _isExecuted;
+
+        public override void Initialize(GraphObject graph)
+        {
+            graphObject = graph;
+
+            _inputSlot = new(this, new()
+            {
+                slotName = "Input",
+                nodeID = Id,
+                slotIndex = 0,
+                direction = SlotDirection.Input,
+                valueType = typeof(object).FullName
+            });
+
+            _outputSlot = new(this, new()
+            {
+                slotName = "Output",
+                nodeID = Id,
+                slotIndex = 0,
+                direction = SlotDirection.Output,
+                valueType = typeof(object).FullName
+            });
+        }
+
+        public void AddSlot(Slot slot)
+        {
+        }
+
+        public void RemoveSlot(Slot slot)
+        {
+        }
+
+        public Slot GetSlot(int index, SlotDirection direction)
+        {
+            return direction switch
+            {
+                SlotDirection.Input => _inputSlot,
+                SlotDirection.Output => _outputSlot,
+                _ => null
+            };
+        }
+
+        public void UnlinkAllSlots()
+        {
+            _inputSlot.UnlinkAll();
+            _outputSlot.UnlinkAll();
+        }
+
+        public void Execute()
+        {
+            if (_isExecuted)
+            {
+                return;
+            }
+
+            _outputSlot.ReceiveData(_inputSlot.value);
+            _outputSlot.PushData(null);
+
+            _isExecuted = true;
+        }
+
+        public void ClearExecutionFlag()
+        {
+            _isExecuted = false;
+        }
     }
 }