Initial commit

Library/PackageCache/com.unity.shadergraph@c8830f61858d/Editor/Data/Graphs/DataStore.cs

@@ -0,0 +1,29 @@
+using UnityEditor.ShaderGraph;
+using ActionType = UnityEditor.ShaderGraph.IGraphDataAction;
+using System;
+using UnityEngine;
+
+namespace UnityEditor.ShaderGraph
+{
+    class DataStore<T>
+    {
+        Action<T, ActionType> m_Reducer;
+        internal T State { get; private set; }
+
+        public Action<T, ActionType> Subscribe;
+
+        internal DataStore(Action<T, ActionType> reducer, T initialState)
+        {
+            m_Reducer = reducer;
+            State = initialState;
+        }
+
+        public void Dispatch(ActionType action)
+        {
+            m_Reducer(State, action);
+            // Note: This would only work with reference types, as value types would require creating a new copy, this works given that we use GraphData which is a heap object
+            // Notifies any listeners about change in state
+            Subscribe?.Invoke(State, action);
+        }
+    }
+}