Fix potential race condition on client side

Former-commit-id: 2616978ec4ca6bed7892afe0f135768801bb0a41

3 files changed, 13 insertions, 8 deletions

diff --git a/src/main/java/com/github/bartimaeusnek/ASM/BWCoreStaticReplacementMethodes.java b/src/main/java/com/github/bartimaeusnek/ASM/BWCoreStaticReplacementMethodes.java
index 6399a5119b..47705042a9 100644
--- a/src/main/java/com/github/bartimaeusnek/ASM/BWCoreStaticReplacementMethodes.java
+++ b/src/main/java/com/github/bartimaeusnek/ASM/BWCoreStaticReplacementMethodes.java
@@ -32,14 +32,18 @@ import net.minecraft.item.crafting.CraftingManager;
 import net.minecraft.item.crafting.IRecipe;
 import net.minecraft.world.World;
 
-import java.util.ArrayList;
 import java.util.HashSet;
 import java.util.Iterator;
 import java.util.List;
 
 public class BWCoreStaticReplacementMethodes {
+    private static ThreadLocal<AccessPriorityList<IRecipe>> RECENTLYUSEDRECIPES = ThreadLocal.withInitial(AccessPriorityList::new);
 
-    public static final AccessPriorityList<IRecipe> RECENTLYUSEDRECIPES = new AccessPriorityList<>();
+    public static void clearRecentlyUsedRecipes() {
+        // the easiest way to ensure the cache is flushed without causing synchronization overhead
+        // is to just replace the whole ThreadLocal instance.
+        RECENTLYUSEDRECIPES = ThreadLocal.withInitial(AccessPriorityList::new);
+    }
 
     @SuppressWarnings("ALL")
     public static ItemStack findCachedMatchingRecipe(InventoryCrafting inventoryCrafting, World world) {
@@ -79,7 +83,8 @@ public class BWCoreStaticReplacementMethodes {
         } else {
 
             IRecipe iPossibleRecipe = null;
-            Iterator<AccessPriorityListNode<IRecipe>> it = RECENTLYUSEDRECIPES.nodeIterator();
+            AccessPriorityList<IRecipe> cache = RECENTLYUSEDRECIPES.get();
+            Iterator<AccessPriorityListNode<IRecipe>> it = cache.nodeIterator();
 
             while (it.hasNext()) {
                 AccessPriorityListNode<IRecipe> recipeNode = it.next();
@@ -88,7 +93,7 @@ public class BWCoreStaticReplacementMethodes {
                 if (!iPossibleRecipe.matches(inventoryCrafting, world))
                     continue;
 
-                RECENTLYUSEDRECIPES.addPrioToNode(recipeNode);
+                cache.addPrioToNode(recipeNode);
                 return iPossibleRecipe.getCraftingResult(inventoryCrafting);
             }
 
@@ -115,7 +120,7 @@ public class BWCoreStaticReplacementMethodes {
                 return stack;
 
             if (stack != null)
-                RECENTLYUSEDRECIPES.addLast(recipe);
+                cache.addLast(recipe);
 
             return stack;
         }
diff --git a/src/main/java/com/github/bartimaeusnek/bartworks/common/commands/ClearCraftingCache.java b/src/main/java/com/github/bartimaeusnek/bartworks/common/commands/ClearCraftingCache.java
index 42385c60f1..f9aba701a6 100644
--- a/src/main/java/com/github/bartimaeusnek/bartworks/common/commands/ClearCraftingCache.java
+++ b/src/main/java/com/github/bartimaeusnek/bartworks/common/commands/ClearCraftingCache.java
@@ -40,7 +40,7 @@ public class ClearCraftingCache extends CommandBase {
 
     @Override
     public void processCommand(ICommandSender p_71515_1_, String[] p_71515_2_) {
-        BWCoreStaticReplacementMethodes.RECENTLYUSEDRECIPES.clear();
-        p_71515_1_.addChatMessage(new ChatComponentText("Recipe Cache cleared? "+(BWCoreStaticReplacementMethodes.RECENTLYUSEDRECIPES.size() == 0)));
+        BWCoreStaticReplacementMethodes.clearRecentlyUsedRecipes();
+        p_71515_1_.addChatMessage(new ChatComponentText("Recipe Cache cleared "));
     }
 }
diff --git a/src/main/java/com/github/bartimaeusnek/bartworks/system/material/CircuitGeneration/CircuitImprintLoader.java b/src/main/java/com/github/bartimaeusnek/bartworks/system/material/CircuitGeneration/CircuitImprintLoader.java
index bad997cb1e..3c4cb02013 100644
--- a/src/main/java/com/github/bartimaeusnek/bartworks/system/material/CircuitGeneration/CircuitImprintLoader.java
+++ b/src/main/java/com/github/bartimaeusnek/bartworks/system/material/CircuitGeneration/CircuitImprintLoader.java
@@ -219,7 +219,7 @@ public class CircuitImprintLoader {
 
     private static void removeOldRecipesFromRegistries() {
         recipeWorldCache.forEach(CraftingManager.getInstance().getRecipeList()::remove);
-        BWCoreStaticReplacementMethodes.RECENTLYUSEDRECIPES.clear();
+        BWCoreStaticReplacementMethodes.clearRecentlyUsedRecipes();
         gtrecipeWorldCache.forEach(GT_Recipe.GT_Recipe_Map.sSlicerRecipes.mRecipeList::remove);
         recipeWorldCache.forEach( r ->
                 {