New lifecycle hook that is called before the level is loaded

src/main/java/ru/bclib/api/LifeCycleAPI.java

@@ -23,6 +23,13 @@ import java.util.concurrent.Executor;
 public class LifeCycleAPI {
 	private final static List<LevelLoadBiomesCall> onLoadLevelBiomes = new ArrayList<>(2);
 	private final static List<LevelLoadCall> onLoadLevel = new ArrayList<>(2);
+	private final static List<BeforeLevelLoadCall> beforeLoadLevel = new ArrayList<>(2);
+	/**
+	 * A callback function that is used for each new ServerLevel instance
+	 */
+	public interface BeforeLevelLoadCall {
+		void beforeLoad();
+	}
 	
 	/**
 	 * A callback function that is used for each new ServerLevel instance
@@ -51,6 +58,17 @@ public class LifeCycleAPI {
 			boolean bl2);
 	}
 	
+	/**
+	 * Register a callback that is called before a level is loaded or created,
+	 * but after the {@link WorldDataAPI} was initialized and patches from
+	 * the {@link ru.bclib.api.datafixer.DataFixerAPI} were applied.
+	 *
+	 * @param call The callback Method
+	 */
+	public static void beforeLevelLoad(BeforeLevelLoadCall call){
+		beforeLoadLevel.add(call);
+	}
+	
 	/**
 	 * Register a callback that is called when a new {@code ServerLevel is instantiated}.
 	 * This callback will receive the world seed as well as it's biome registry.
@@ -69,6 +87,13 @@ public class LifeCycleAPI {
 		onLoadLevel.add(call);
 	}
 	
+	/**
+	 * For internal use, You should not call this method!
+	 * @param src
+	 */
+	public static void _runBeforeLevelLoad(){
+		beforeLoadLevel.forEach(c -> c.beforeLoad());
+	}
 	/**
 	 * For internal use, You should not call this method!
 	 * @param minecraftServer

src/main/java/ru/bclib/mixin/client/MinecraftMixin.java

@@ -22,6 +22,7 @@ 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.callback.CallbackInfo;
+import ru.bclib.api.LifeCycleAPI;
 import ru.bclib.api.dataexchange.DataExchangeAPI;
 import ru.bclib.api.datafixer.DataFixerAPI;
 import ru.bclib.interfaces.CustomColorProvider;
@@ -61,14 +62,18 @@ public abstract class MinecraftMixin {
 		DataExchangeAPI.prepareServerside();
 		
 		if (DataFixerAPI.fixData(this.levelSource, levelID, true, (appliedFixes) -> {
+			LifeCycleAPI._runBeforeLevelLoad();
 			this.doLoadLevel(levelID, RegistryAccess.builtin(), Minecraft::loadDataPacks, Minecraft::loadWorldData, false, appliedFixes?ExperimentalDialogType.NONE:ExperimentalDialogType.BACKUP);
 		})) {
 			ci.cancel();
+		} else {
+			LifeCycleAPI._runBeforeLevelLoad();
 		}
 	}
 	
 	@Inject(method = "createLevel", at = @At("HEAD"))
 	private void bclib_initPatchData(String levelID, LevelSettings levelSettings, RegistryHolder registryHolder, WorldGenSettings worldGenSettings, CallbackInfo ci) {
 		DataFixerAPI.initializeWorldData(this.levelSource, levelID, true);
+		LifeCycleAPI._runBeforeLevelLoad();
 	}
 }

src/main/java/ru/bclib/mixin/common/MainMixin.java

@@ -1,10 +1,12 @@
 package ru.bclib.mixin.common;
 
 import net.minecraft.server.Main;
+import net.minecraft.server.level.ServerLevel;
 import net.minecraft.world.level.storage.LevelStorageSource;
 import org.spongepowered.asm.mixin.Mixin;
 import org.spongepowered.asm.mixin.injection.At;
 import org.spongepowered.asm.mixin.injection.ModifyArg;
+import ru.bclib.api.LifeCycleAPI;
 import ru.bclib.api.datafixer.DataFixerAPI;
 
 @Mixin(Main.class)
@@ -12,6 +14,7 @@ abstract public class MainMixin {
 	@ModifyArg(method="main", at=@At(value="INVOKE_ASSIGN", target="Lnet/minecraft/world/level/storage/LevelStorageSource$LevelStorageAccess;getSummary()Lnet/minecraft/world/level/storage/LevelSummary;"))
 	private static LevelStorageSource.LevelStorageAccess bclib_callServerFix(LevelStorageSource.LevelStorageAccess session){
 		DataFixerAPI.fixData(session, false, (didFix)->{/* not called when showUI==false */});
+		LifeCycleAPI._runBeforeLevelLoad();
 		return session;
 	}
 }