Defer Redstone Cache Initialisation to the start of the world tick

src/main/java/gregtech/api/metatileentity/MetaTileEntityHolder.java

@@ -6,6 +6,8 @@
 import gregtech.api.block.machines.BlockMachine;
 import gregtech.api.cover.CoverBehavior;
 import gregtech.api.gui.IUIHolder;
+import gregtech.api.util.FirstTickScheduler;
+import gregtech.api.util.FirstTickTask;
 import gregtech.api.util.GTControlledRegistry;
 import gregtech.api.util.GTLog;
 import net.minecraft.block.state.IBlockState;
@@ -25,7 +27,7 @@
 import java.util.List;
 import java.util.stream.Collectors;
 
-public class MetaTileEntityHolder extends TickableTileEntityBase implements IUIHolder {
+public class MetaTileEntityHolder extends TickableTileEntityBase implements IUIHolder, FirstTickTask {
 
     private MetaTileEntity metaTileEntity;
     private boolean needToUpdateLightning = false;
@@ -215,8 +217,15 @@ public void markAsDirty() {
     @Override
     public void onLoad() {
         super.onLoad();
-        if (metaTileEntity != null) {
-            metaTileEntity.onLoad();
+        if (this.metaTileEntity != null) {
+            FirstTickScheduler.addTask(this);
+        }
+    }
+
+    @Override
+    public void handleFirstTick() {
+        if (this.metaTileEntity != null) {
+            this.metaTileEntity.onLoad();
         }
     }
 

src/main/java/gregtech/api/pipenet/tile/TileEntityPipeBase.java

@@ -8,6 +8,8 @@
 import gregtech.api.pipenet.WorldPipeNet;
 import gregtech.api.pipenet.block.BlockPipe;
 import gregtech.api.pipenet.block.IPipeType;
+import gregtech.api.util.FirstTickScheduler;
+import gregtech.api.util.FirstTickTask;
 import net.minecraft.block.Block;
 import net.minecraft.block.state.IBlockState;
 import net.minecraft.nbt.NBTTagCompound;
@@ -23,7 +25,7 @@
 import javax.annotation.Nullable;
 import java.util.function.Consumer;
 
-public abstract class TileEntityPipeBase<PipeType extends Enum<PipeType> & IPipeType<NodeDataType>, NodeDataType> extends SyncedTileEntityBase implements IPipeTile<PipeType, NodeDataType> {
+public abstract class TileEntityPipeBase<PipeType extends Enum<PipeType> & IPipeType<NodeDataType>, NodeDataType> extends SyncedTileEntityBase implements IPipeTile<PipeType, NodeDataType>, FirstTickTask {
 
     private TIntIntMap blockedConnectionsMap = new TIntIntHashMap();
     private int blockedConnections = 0;
@@ -283,6 +285,11 @@ public void readFromNBT(NBTTagCompound compound) {
     @Override
     public void onLoad() {
         super.onLoad();
+        FirstTickScheduler.addTask(this);
+    }
+
+    @Override
+    public void handleFirstTick() {
         this.coverableImplementation.onLoad();
     }
 

src/main/java/gregtech/api/util/FirstTickScheduler.java

@@ -0,0 +1,52 @@
+package gregtech.api.util;
+
+import java.util.Map;
+import java.util.Queue;
+
+import com.google.common.collect.Maps;
+import com.google.common.collect.Queues;
+
+import gregtech.api.GTValues;
+import net.minecraft.world.World;
+import net.minecraftforge.event.world.WorldEvent;
+import net.minecraftforge.fml.common.Mod.EventBusSubscriber;
+import net.minecraftforge.fml.common.eventhandler.EventPriority;
+import net.minecraftforge.fml.common.eventhandler.SubscribeEvent;
+import net.minecraftforge.fml.common.gameevent.TickEvent;
+
+@EventBusSubscriber(modid = GTValues.MODID)
+public class FirstTickScheduler {
+
+    private static Map<World, Queue<FirstTickTask>> tasksByWorld = Maps.newConcurrentMap();
+
+    public static void addTask(final FirstTickTask task) {
+        final World world = task.getWorld();
+        if (!world.isRemote) {
+            final Queue<FirstTickTask> tasks = tasksByWorld.computeIfAbsent(world, k -> Queues.newConcurrentLinkedQueue());
+            tasks.add(task);
+        } else {
+            task.handleFirstTick();
+        }
+    }
+
+    @SubscribeEvent
+    public static void onWorldUnload(final WorldEvent.Unload event) {
+        tasksByWorld.remove(event.getWorld());
+    }
+
+    @SubscribeEvent(priority = EventPriority.HIGHEST)
+    public static void onWorldTick(TickEvent.WorldTickEvent event) {
+        if (event.phase == TickEvent.Phase.START) {
+            final Queue<FirstTickTask> tasks = tasksByWorld.get(event.world);
+            if (tasks == null) {
+                return;
+            }
+
+            FirstTickTask task = tasks.poll();
+            while (task != null) {
+                task.handleFirstTick();
+                task = tasks.poll();
+            }
+        }
+    }
+}

src/main/java/gregtech/api/util/FirstTickTask.java

@@ -0,0 +1,10 @@
+package gregtech.api.util;
+
+import net.minecraft.world.World;
+
+public interface FirstTickTask {
+
+    void handleFirstTick();
+
+    World getWorld();
+}