portal caching, ignored item not creating portals issue on purpose

src/main/java/carpet/CarpetSettings.java

@@ -1,41 +1,32 @@
 package carpet;
 
+import carpet.fakes.MinecraftServer_motdInterface;
+import carpet.fakes.PortalForcerInterface;
+import carpet.utils.Messenger;
+import net.minecraft.server.MinecraftServer;
+import net.minecraft.server.command.ServerCommandSource;
+import net.minecraft.server.dedicated.DedicatedServer;
+import net.minecraft.server.network.ServerPlayerEntity;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.FileReader;
+import java.io.FileWriter;
+import java.io.IOException;
 import java.lang.reflect.Field;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
-import java.util.concurrent.CompletableFuture;
-import java.util.concurrent.ExecutionException;
-import java.util.concurrent.TimeUnit;
-import java.util.concurrent.TimeoutException;
 import java.util.function.BiConsumer;
-import java.util.function.Consumer;
 import java.util.stream.Collectors;
 import java.util.stream.Stream;
 
-import java.io.File;
-import java.io.FileWriter;
-import java.io.FileReader;
-import java.io.BufferedReader;
-import java.io.IOException;
-import java.io.FileNotFoundException;
-
 //import carpet.helpers.SpawnChunks;
-import carpet.fakes.MinecraftServer_motdInterface;
-import carpet.utils.Messenger;
-import net.minecraft.server.command.CommandSource;
-import net.minecraft.server.command.ServerCommandSource;
-import net.minecraft.server.network.ServerPlayerEntity;
-import net.minecraft.server.dedicated.DedicatedServer;
-import net.minecraft.util.math.ChunkPos;
-import net.minecraft.server.world.ServerWorld;
-import net.minecraft.world.dimension.DimensionType;
-import org.apache.logging.log4j.LogManager;
-import org.apache.logging.log4j.Logger;
-
-import net.minecraft.server.MinecraftServer;
 
 public class CarpetSettings
 {
@@ -136,7 +127,9 @@ public class CarpetSettings
   rule("commandPlayer",         "commands", "Enables /player command to control/spawn players").isACommand().wip(),
   rule("carpets",               "survival", "Placing carpets may issue carpet commands for non-op players"),
   rule("missingTools",          "survival", "Pistons, Glass and Sponge can be broken faster with their appropriate tools").wip(),
-  rule("portalCaching",         "survival experimental", "Alternative, persistent caching strategy for nether portals").wip(),
+  rule("portalCaching",         "survival experimental", "Alternative, persistent caching strategy for nether portals").validate(
+          (s, n) -> s.getMinecraftServer().getWorlds().forEach(w -> ((PortalForcerInterface)w.getPortalForcer()).invalidateCache())
+  ),
   rule("calmNetherFires",       "experimental", "Permanent fires don't schedule random updates").wip(),
   rule("fillUpdates",           "creative", "fill/clone/setblock and structure blocks cause block updates").defaultTrue().boolAccelerate(),
   rule("pushLimit",             "creative","Customizable piston push limit")

src/main/java/carpet/fakes/PortalForcerInterface.java

@@ -0,0 +1,6 @@
+package carpet.fakes;
+
+public interface PortalForcerInterface
+{
+    void invalidateCache();
+}

src/main/java/carpet/mixins/PortalBlock_portalCachingMixin.java

@@ -0,0 +1,43 @@
+package carpet.mixins;
+
+import carpet.CarpetSettings;
+import carpet.fakes.PortalForcerInterface;
+import net.minecraft.block.BlockState;
+import net.minecraft.block.PortalBlock;
+import net.minecraft.server.world.ServerWorld;
+import net.minecraft.util.math.BlockPos;
+import net.minecraft.util.math.Direction;
+import net.minecraft.world.IWorld;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfoReturnable;
+
+@Mixin(PortalBlock.class)
+public class PortalBlock_portalCachingMixin
+{
+    @Inject(method = "createPortalAt", at = @At(
+            value =  "INVOKE",
+            target = "Lnet/minecraft/block/PortalBlock$AreaHelper;createPortal()V"
+    ))
+    private void onCreatePortal(IWorld iWorld_1, BlockPos blockPos_1, CallbackInfoReturnable<Boolean> cir)
+    {
+        if (!iWorld_1.isClient() && CarpetSettings.getBool("portalCaching"))
+        {
+            ((PortalForcerInterface)((ServerWorld)iWorld_1).getPortalForcer()).invalidateCache();
+        }
+    }
+
+    @Inject(method = "getStateForNeighborUpdate", at = @At(
+            value = "INVOKE",
+            target = "Lnet/minecraft/block/Block;getDefaultState()Lnet/minecraft/block/BlockState;"
+    ))
+    private void getAirBlockState(BlockState blockState_1, Direction direction_1, BlockState blockState_2, IWorld iWorld_1, BlockPos blockPos_1, BlockPos blockPos_2, CallbackInfoReturnable<BlockState> cir)
+    {
+        if (!iWorld_1.isClient() && CarpetSettings.getBool("portalCaching"))
+        {
+            ((PortalForcerInterface)((ServerWorld)iWorld_1).getPortalForcer()).invalidateCache();
+        }
+    }
+
+}

src/main/java/carpet/mixins/PortalForcer_portalCachingMixin.java

@@ -0,0 +1,78 @@
+package carpet.mixins;
+
+import carpet.CarpetSettings;
+import carpet.fakes.PortalForcerInterface;
+import net.minecraft.entity.Entity;
+import net.minecraft.server.world.ChunkTicketType;
+import net.minecraft.server.world.ServerWorld;
+import net.minecraft.util.math.BlockPos;
+import net.minecraft.util.math.ChunkPos;
+import net.minecraft.util.math.ColumnPos;
+import net.minecraft.world.PortalForcer;
+import org.spongepowered.asm.mixin.Final;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.Redirect;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfoReturnable;
+
+import java.util.HashMap;
+import java.util.Map;
+
+@Mixin(PortalForcer.class)
+public class PortalForcer_portalCachingMixin implements PortalForcerInterface
+{
+    @Shadow @Final private ServerWorld world;
+    private Map<ColumnPos, Object> storedTicketInfos = new HashMap<>();
+
+    @Override
+    public void invalidateCache()
+    {
+        storedTicketInfos.clear();
+    }
+
+    @Inject(method = "createPortal", at = @At("HEAD"))
+    private void portalSpawnedByTheGame(Entity entity_1, CallbackInfoReturnable<Boolean> cir)
+    {
+        invalidateCache();
+    }
+
+    @Redirect(method = "getPortal", at = @At(
+            value = "INVOKE",
+            target = "Ljava/util/Map;get(Ljava/lang/Object;)Ljava/lang/Object;"
+    ))
+    private Object /* private TicketInfo */ getTicketInfo(Map map, Object /* ColumnPos */ key)
+    {
+        //Do the dance with ticketinfos. If vanilla has one, we gonna borrow, if vanilla is missing, we supply
+        if (!CarpetSettings.getBool("portalCaching"))
+            return map.get(key);
+        Object ticketInfo = map.get(key);
+        if (ticketInfo != null)
+        {
+            storedTicketInfos.put((ColumnPos) key, ticketInfo);
+            return ticketInfo;
+        }
+        ticketInfo = storedTicketInfos.get(key);
+        if (ticketInfo != null)
+        {
+            // vanilla got removed, but we stored it meaning we not only need to add it but also let it chunkload
+            map.put(key, ticketInfo);
+            ColumnPos cpos = (ColumnPos)key;
+            BlockPos fakePos = new BlockPos(((ColumnPos) key).x, 0, ((ColumnPos) key).z);
+            world.method_14178().addTicket(ChunkTicketType.PORTAL, new ChunkPos(fakePos), 3, (ColumnPos) key);
+        }
+        return ticketInfo;
+    }
+
+    @Redirect(method = "getPortal", at = @At(
+            value = "INVOKE",
+            target = "Ljava/util/Map;put(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;"
+    ))
+    private Object /* TicketInfo */ putNewTicket(Map map, Object /*ColumnPos */ key, Object /*TicketInfo */ value)
+    {
+        if (CarpetSettings.getBool("portalCaching"))
+            storedTicketInfos.put((ColumnPos) key, value);
+        return map.put(key, value);
+    }
+}

src/main/resources/carpet.mixins.json

@@ -64,6 +64,9 @@
     "ItemUsageContext_cactusMixin",
     "DispenserBehaviour_cactusMixin",
 
+    "PortalForcer_portalCachingMixin",
+    "PortalBlock_portalCachingMixin",
+
     "HopperBlockEntityMixin",
     "ContainerMixin",
     "ClientConnectionMixin",