Initial tickable multipart entity implementation

src/main/java/net/shadowfacts/simplemultipart/SimpleMultipart.java

@@ -1,6 +1,7 @@
 package net.shadowfacts.simplemultipart;
 
 import net.fabricmc.api.ModInitializer;
+import net.minecraft.block.entity.BlockEntity;
 import net.minecraft.block.entity.BlockEntityType;
 import net.minecraft.util.Identifier;
 import net.minecraft.util.registry.IdRegistry;
@@ -9,14 +10,13 @@ import net.minecraft.world.loot.context.LootContextType;
 import net.minecraft.world.loot.context.LootContextTypes;
 import net.minecraft.world.loot.context.Parameter;
 import net.minecraft.world.loot.context.Parameters;
-import net.shadowfacts.simplemultipart.container.ContainerBlockEntity;
+import net.shadowfacts.simplemultipart.container.*;
-import net.shadowfacts.simplemultipart.container.ContainerEventHandler;
-import net.shadowfacts.simplemultipart.container.ContainerBlock;
 import net.shadowfacts.simplemultipart.multipart.Multipart;
 import net.shadowfacts.simplemultipart.multipart.MultipartState;
 
 import java.lang.reflect.Method;
 import java.util.function.Consumer;
+import java.util.function.Supplier;
 
 /**
  * @author shadowfacts
@@ -31,7 +31,8 @@ public class SimpleMultipart implements ModInitializer {
 	public static final LootContextType MULTIPART_LOOT_CONTEXT = createMultipartLootContextType();
 
 	public static final ContainerBlock containerBlock = new ContainerBlock();
-	public static final BlockEntityType<ContainerBlockEntity> containerBlockEntity = createBlockEntityType();
+	public static final BlockEntityType<ContainerBlockEntity> containerBlockEntity = createBlockEntityType("container", ContainerBlockEntity::new);
+	public static final BlockEntityType<TickableContainerBlockEntity> tickableContainerBlockEntity = createBlockEntityType("tickable_container", TickableContainerBlockEntity::new);
 
 	@Override
 	public void onInitialize() {
@@ -46,9 +47,9 @@ public class SimpleMultipart implements ModInitializer {
 		return registry;
 	}
 
-	private static BlockEntityType<ContainerBlockEntity> createBlockEntityType() {
+	private static <T extends BlockEntity> BlockEntityType<T> createBlockEntityType(String name, Supplier<T> supplier) {
-		BlockEntityType.Builder<ContainerBlockEntity> builder = BlockEntityType.Builder.create(ContainerBlockEntity::new);
+		BlockEntityType.Builder<T> builder = BlockEntityType.Builder.create(supplier);
-		return Registry.register(Registry.BLOCK_ENTITY, new Identifier(MODID, "container"), builder.method_11034(null));
+		return Registry.register(Registry.BLOCK_ENTITY, new Identifier(MODID, name), builder.method_11034(null));
 	}
 
 	private static LootContextType createMultipartLootContextType() {

src/main/java/net/shadowfacts/simplemultipart/container/AbstractContainerBlockEntity.java

@@ -0,0 +1,218 @@
+package net.shadowfacts.simplemultipart.container;
+
+import com.google.common.collect.ImmutableSet;
+import net.fabricmc.fabric.api.util.NbtType;
+import net.fabricmc.fabric.block.entity.ClientSerializable;
+import net.minecraft.block.Block;
+import net.minecraft.block.BlockState;
+import net.minecraft.block.Blocks;
+import net.minecraft.block.entity.BlockEntity;
+import net.minecraft.block.entity.BlockEntityType;
+import net.minecraft.item.ItemStack;
+import net.minecraft.nbt.CompoundTag;
+import net.minecraft.nbt.ListTag;
+import net.minecraft.nbt.Tag;
+import net.minecraft.server.world.ServerWorld;
+import net.minecraft.util.Tickable;
+import net.minecraft.util.math.BlockPos;
+import net.minecraft.util.shape.VoxelShape;
+import net.minecraft.world.loot.context.LootContext;
+import net.minecraft.world.loot.context.Parameters;
+import net.shadowfacts.simplemultipart.SimpleMultipart;
+import net.shadowfacts.simplemultipart.api.MultipartContainer;
+import net.shadowfacts.simplemultipart.multipart.MultipartState;
+import net.shadowfacts.simplemultipart.multipart.entity.MultipartEntity;
+import net.shadowfacts.simplemultipart.multipart.entity.MultipartEntityProvider;
+import net.shadowfacts.simplemultipart.util.MultipartHelper;
+import net.shadowfacts.simplemultipart.api.MultipartView;
+import net.shadowfacts.simplemultipart.util.ShapeUtils;
+
+import java.util.*;
+import java.util.stream.Collectors;
+
+/**
+ * @author shadowfacts
+ */
+public abstract class AbstractContainerBlockEntity extends BlockEntity implements MultipartContainer, ClientSerializable {
+
+	protected Set<Entry> parts = new HashSet<>();
+
+	public AbstractContainerBlockEntity(BlockEntityType<?> type) {
+		super(type);
+	}
+
+	@Override
+	public Set<MultipartView> getParts() {
+		return ImmutableSet.copyOf(parts);
+	}
+
+	@Override
+	public boolean canInsert(MultipartState partState) {
+		VoxelShape newShape = partState.getBoundingShape(null);
+		for (Entry e : parts) {
+			VoxelShape existingShape = e.state.getBoundingShape(e);
+			if (ShapeUtils.intersect(newShape, existingShape)) {
+				return false;
+			}
+		}
+
+		return true;
+	}
+
+	@Override
+	public void insert(MultipartState partState) {
+		if (!canInsert(partState)) {
+			return;
+		}
+
+		MultipartEntity entity = null;
+		if (partState.getMultipart() instanceof MultipartEntityProvider) {
+			entity = ((MultipartEntityProvider)partState.getMultipart()).createMultipartEntity(partState, this);
+		}
+		parts.add(new Entry(this, partState, entity));
+
+		updateWorld();
+	}
+
+	@Override
+	public void remove(MultipartState partState) {
+		parts.removeIf(e -> e.state == partState);
+
+		if (parts.isEmpty()) {
+			world.setBlockState(pos, Blocks.AIR.getDefaultState());
+		} else {
+			updateWorld();
+		}
+	}
+
+	@Override
+	public boolean breakPart(MultipartState partState) {
+		Optional<Entry> entry = parts.stream().filter(e -> e.state == partState).findFirst();
+		if (!entry.isPresent()) {
+			return false;
+		}
+
+		if (world instanceof ServerWorld) {
+			List<ItemStack> drops = getDroppedStacks(entry.get(), (ServerWorld)world, pos);
+			drops.forEach(stack -> Block.dropStack(world, pos, stack));
+			// TODO: don't drop if player is creative
+		}
+
+		remove(partState);
+
+		updateWorld();
+
+		return true;
+	}
+
+	@Override
+	public void schedulePartSave() {
+		markDirty(); // see yarn #360
+	}
+
+	private void updateWorld() {
+		boolean hasTickableParts = parts.stream().anyMatch(e -> e.getEntity() != null && e.getEntity() instanceof Tickable);
+		boolean currentlyTickable = this instanceof Tickable;
+		if (hasTickableParts != currentlyTickable) {
+			AbstractContainerBlockEntity newContainer = hasTickableParts ? new TickableContainerBlockEntity() : new ContainerBlockEntity();
+			world.setBlockEntity(pos, newContainer);
+			newContainer.parts = parts.stream()
+					.map(e -> new Entry(newContainer, e.state, e.entity))
+					.collect(Collectors.toSet());
+		}
+
+		world.markDirty(pos, world.getBlockEntity(pos));
+		world.scheduleBlockRender(pos);
+		BlockState blockState = world.getBlockState(pos);
+		world.updateListeners(pos, blockState, blockState, 3);
+	}
+
+	private List<ItemStack> getDroppedStacks(Entry e, ServerWorld world, BlockPos pos) {
+		LootContext.Builder builder = new LootContext.Builder(world);
+		builder.setRandom(world.random);
+		builder.put(SimpleMultipart.MULTIPART_STATE_PARAMETER, e.state);
+		builder.put(Parameters.POSITION, pos);
+		return e.state.getDroppedStacks(e, builder);
+	}
+
+	private ListTag partsToTag() {
+		ListTag list = new ListTag();
+		for (Entry e : parts) {
+			CompoundTag tag = new CompoundTag();
+			tag.put("part", MultipartHelper.serializeMultipartState(e.state));
+			if (e.entity != null) {
+				tag.put("entity", e.entity.toTag(new CompoundTag()));
+			}
+			list.add(tag);
+		}
+		return list;
+	}
+
+	private void partsFromTag(ListTag list) {
+		parts.clear();
+		for (Tag tag : list) {
+			CompoundTag compound = (CompoundTag)tag;
+			MultipartState state = MultipartHelper.deserializeMultipartState(compound.getCompound("part"));
+			MultipartEntity entity = null;
+			if (state.getMultipart() instanceof MultipartEntityProvider && compound.containsKey("entity", NbtType.COMPOUND)) {
+				entity = ((MultipartEntityProvider)state.getMultipart()).createMultipartEntity(state, this);
+				entity.fromTag(compound.getCompound("entity"));
+			}
+			parts.add(new Entry(this, state, entity));
+		}
+	}
+
+	@Override
+	public CompoundTag toTag(CompoundTag tag) {
+		tag.put("parts", partsToTag());
+		return super.toTag(tag);
+	}
+
+	@Override
+	public void fromTag(CompoundTag tag) {
+		super.fromTag(tag);
+		ListTag list = tag.getList("parts", NbtType.COMPOUND);
+		partsFromTag(list);
+	}
+
+	@Override
+	public CompoundTag toClientTag(CompoundTag tag) {
+		tag.put("parts", partsToTag());
+		return tag;
+	}
+
+	@Override
+	public void fromClientTag(CompoundTag tag) {
+		ListTag list = tag.getList("parts", NbtType.COMPOUND);
+		partsFromTag(list);
+		updateWorld();
+	}
+
+	public static class Entry implements MultipartView {
+		public final MultipartContainer container;
+		public final MultipartState state;
+		public final MultipartEntity entity;
+
+		private Entry(MultipartContainer container, MultipartState state, MultipartEntity entity) {
+			this.container = container;
+			this.state = state;
+			this.entity = entity;
+		}
+
+		@Override
+		public MultipartContainer getContainer() {
+			return container;
+		}
+
+		@Override
+		public MultipartState getState() {
+			return state;
+		}
+
+		@Override
+		public MultipartEntity getEntity() {
+			return entity;
+		}
+	}
+
+}

src/main/java/net/shadowfacts/simplemultipart/container/ContainerBlock.java

@@ -71,7 +71,7 @@ public class ContainerBlock extends Block implements BlockEntityProvider, Render
 	}
 
 	@Override
-	public ContainerBlockEntity createBlockEntity(BlockView world) {
+	public AbstractContainerBlockEntity createBlockEntity(BlockView world) {
 		return new ContainerBlockEntity();
 	}
 }

src/main/java/net/shadowfacts/simplemultipart/container/ContainerBlockEntity.java

@@ -1,197 +1,14 @@
 package net.shadowfacts.simplemultipart.container;
 
-import com.google.common.collect.ImmutableSet;
-import net.fabricmc.fabric.api.util.NbtType;
-import net.fabricmc.fabric.block.entity.ClientSerializable;
-import net.minecraft.block.Block;
-import net.minecraft.block.BlockState;
-import net.minecraft.block.Blocks;
-import net.minecraft.block.entity.BlockEntity;
-import net.minecraft.item.ItemStack;
-import net.minecraft.nbt.CompoundTag;
-import net.minecraft.nbt.ListTag;
-import net.minecraft.nbt.Tag;
-import net.minecraft.server.world.ServerWorld;
-import net.minecraft.util.math.BlockPos;
-import net.minecraft.util.shape.VoxelShape;
-import net.minecraft.world.loot.context.LootContext;
-import net.minecraft.world.loot.context.Parameters;
 import net.shadowfacts.simplemultipart.SimpleMultipart;
-import net.shadowfacts.simplemultipart.api.MultipartContainer;
-import net.shadowfacts.simplemultipart.multipart.MultipartState;
-import net.shadowfacts.simplemultipart.multipart.entity.MultipartEntity;
-import net.shadowfacts.simplemultipart.multipart.entity.MultipartEntityProvider;
-import net.shadowfacts.simplemultipart.util.MultipartHelper;
-import net.shadowfacts.simplemultipart.api.MultipartView;
-import net.shadowfacts.simplemultipart.util.ShapeUtils;
-
-import java.util.*;
 
 /**
  * @author shadowfacts
  */
-public class ContainerBlockEntity extends BlockEntity implements MultipartContainer, ClientSerializable {
+public class ContainerBlockEntity extends AbstractContainerBlockEntity {
-
-	private Set<Entry> parts = new HashSet<>();
 
 	public ContainerBlockEntity() {
 		super(SimpleMultipart.containerBlockEntity);
 	}
 
-	@Override
-	public Set<MultipartView> getParts() {
-		return ImmutableSet.copyOf(parts);
-	}
-
-	@Override
-	public boolean canInsert(MultipartState partState) {
-		VoxelShape newShape = partState.getBoundingShape(null);
-		for (Entry e : parts) {
-			VoxelShape existingShape = e.state.getBoundingShape(e);
-			if (ShapeUtils.intersect(newShape, existingShape)) {
-				return false;
-			}
-		}
-
-		return true;
-	}
-
-	@Override
-	public void insert(MultipartState partState) {
-		if (!canInsert(partState)) {
-			return;
-		}
-
-		MultipartEntity entity = null;
-		if (partState.getMultipart() instanceof MultipartEntityProvider) {
-			entity = ((MultipartEntityProvider)partState.getMultipart()).createMultipartEntity(partState, this);
-		}
-		parts.add(new Entry(partState, entity));
-		markDirty();
-		world.scheduleBlockRender(pos);
-	}
-
-	@Override
-	public void remove(MultipartState partState) {
-		parts.removeIf(e -> e.state == partState);
-
-		if (parts.isEmpty()) {
-			world.setBlockState(pos, Blocks.AIR.getDefaultState());
-		}
-	}
-
-	@Override
-	public boolean breakPart(MultipartState partState) {
-		Optional<Entry> entry = parts.stream().filter(e -> e.state == partState).findFirst();
-		if (!entry.isPresent()) {
-			return false;
-		}
-
-		if (world instanceof ServerWorld) {
-			List<ItemStack> drops = getDroppedStacks(entry.get(), (ServerWorld)world, pos);
-			drops.forEach(stack -> Block.dropStack(world, pos, stack));
-			// TODO: don't drop if player is creative
-		}
-
-		remove(partState);
-
-		world.markDirty(pos, this);
-		world.scheduleBlockRender(pos);
-		BlockState blockState = world.getBlockState(pos);
-		world.updateListeners(pos, blockState, blockState, 3);
-
-		return true;
-	}
-
-	@Override
-	public void schedulePartSave() {
-		markDirty(); // see yarn #360
-	}
-
-	private List<ItemStack> getDroppedStacks(ContainerBlockEntity.Entry e, ServerWorld world, BlockPos pos) {
-		LootContext.Builder builder = new LootContext.Builder(world);
-		builder.setRandom(world.random);
-		builder.put(SimpleMultipart.MULTIPART_STATE_PARAMETER, e.state);
-		builder.put(Parameters.POSITION, pos);
-		return e.state.getDroppedStacks(e, builder);
-	}
-
-	private ListTag partsToTag() {
-		ListTag list = new ListTag();
-		for (Entry e : parts) {
-			CompoundTag tag = new CompoundTag();
-			tag.put("part", MultipartHelper.serializeMultipartState(e.state));
-			if (e.entity != null) {
-				tag.put("entity", e.entity.toTag(new CompoundTag()));
-			}
-			list.add(tag);
-		}
-		return list;
-	}
-
-	private void partsFromTag(ListTag list) {
-		parts.clear();
-		for (Tag tag : list) {
-			CompoundTag compound = (CompoundTag)tag;
-			MultipartState state = MultipartHelper.deserializeMultipartState(compound.getCompound("part"));
-			MultipartEntity entity = null;
-			if (state.getMultipart() instanceof MultipartEntityProvider && compound.containsKey("entity", NbtType.COMPOUND)) {
-				entity = ((MultipartEntityProvider)state.getMultipart()).createMultipartEntity(state, this);
-				entity.fromTag(compound.getCompound("entity"));
-			}
-			parts.add(new Entry(state, entity));
-		}
-	}
-
-	@Override
-	public CompoundTag toTag(CompoundTag tag) {
-		tag.put("parts", partsToTag());
-		return super.toTag(tag);
-	}
-
-	@Override
-	public void fromTag(CompoundTag tag) {
-		super.fromTag(tag);
-		ListTag list = tag.getList("parts", NbtType.COMPOUND);
-		partsFromTag(list);
-	}
-
-	@Override
-	public CompoundTag toClientTag(CompoundTag tag) {
-		tag.put("parts", partsToTag());
-		return tag;
-	}
-
-	@Override
-	public void fromClientTag(CompoundTag tag) {
-		ListTag list = tag.getList("parts", NbtType.COMPOUND);
-		partsFromTag(list);
-		world.scheduleBlockRender(pos);
-	}
-
-	public class Entry implements MultipartView {
-		public final MultipartState state;
-		public final MultipartEntity entity;
-
-		private Entry(MultipartState state, MultipartEntity entity) {
-			this.state = state;
-			this.entity = entity;
-		}
-
-		@Override
-		public ContainerBlockEntity getContainer() {
-			return ContainerBlockEntity.this; // TODO: is this bad?
-		}
-
-		@Override
-		public MultipartState getState() {
-			return state;
-		}
-
-		@Override
-		public MultipartEntity getEntity() {
-			return entity;
-		}
-	}
-
 }

src/main/java/net/shadowfacts/simplemultipart/container/ContainerEventHandler.java

@@ -1,6 +1,7 @@
 package net.shadowfacts.simplemultipart.container;
 
 import net.fabricmc.fabric.events.PlayerInteractionEvent;
+import net.minecraft.block.Block;
 import net.minecraft.entity.player.PlayerEntity;
 import net.minecraft.util.ActionResult;
 import net.minecraft.util.Hand;

src/main/java/net/shadowfacts/simplemultipart/container/TickableContainerBlockEntity.java

@@ -0,0 +1,24 @@
+package net.shadowfacts.simplemultipart.container;
+
+import net.minecraft.util.Tickable;
+import net.shadowfacts.simplemultipart.SimpleMultipart;
+
+/**
+ * @author shadowfacts
+ */
+public class TickableContainerBlockEntity extends AbstractContainerBlockEntity implements Tickable {
+
+	public TickableContainerBlockEntity() {
+		super(SimpleMultipart.tickableContainerBlockEntity);
+	}
+
+	@Override
+	public void tick() {
+		for (Entry e : parts) {
+			if (e.getEntity() != null && e.getEntity() instanceof Tickable) {
+				((Tickable)e.getEntity()).tick();
+			}
+		}
+	}
+
+}

src/main/java/net/shadowfacts/simplemultipart/item/ItemMultipart.java

@@ -6,7 +6,6 @@ import net.minecraft.item.ItemUsageContext;
 import net.minecraft.util.ActionResult;
 import net.shadowfacts.simplemultipart.SimpleMultipart;
 import net.shadowfacts.simplemultipart.api.MultipartContainer;
-import net.shadowfacts.simplemultipart.container.ContainerBlockEntity;
 import net.shadowfacts.simplemultipart.multipart.Multipart;
 import net.shadowfacts.simplemultipart.multipart.MultipartState;
 import net.shadowfacts.simplemultipart.util.MultipartPlacementContext;

src/main/java/net/shadowfacts/simplemultipart/util/MultipartHelper.java

@@ -15,7 +15,6 @@ import net.minecraft.util.shape.VoxelShape;
 import net.minecraft.world.World;
 import net.shadowfacts.simplemultipart.SimpleMultipart;
 import net.shadowfacts.simplemultipart.api.MultipartContainer;
-import net.shadowfacts.simplemultipart.container.ContainerBlockEntity;
 import net.shadowfacts.simplemultipart.multipart.Multipart;
 import net.shadowfacts.simplemultipart.multipart.MultipartState;
 

src/test/java/net/shadowfacts/simplemultipart/test/EntityTestPart.java

@@ -6,7 +6,8 @@ import net.minecraft.util.Hand;
 import net.minecraft.util.math.BlockPos;
 import net.minecraft.util.shape.VoxelShape;
 import net.minecraft.util.shape.VoxelShapes;
-import net.shadowfacts.simplemultipart.container.ContainerBlockEntity;
+import net.shadowfacts.simplemultipart.api.MultipartContainer;
+import net.shadowfacts.simplemultipart.container.AbstractContainerBlockEntity;
 import net.shadowfacts.simplemultipart.multipart.Multipart;
 import net.shadowfacts.simplemultipart.multipart.MultipartState;
 import net.shadowfacts.simplemultipart.multipart.entity.MultipartEntity;
@@ -33,17 +34,17 @@ public class EntityTestPart extends Multipart implements MultipartEntityProvider
 	}
 
 	@Override
-	public MultipartEntity createMultipartEntity(MultipartState state, ContainerBlockEntity container) {
+	public MultipartEntity createMultipartEntity(MultipartState state, MultipartContainer container) {
 		return new Entity(container);
 	}
 
 	public static class Entity extends MultipartEntity {
-		public Entity(ContainerBlockEntity container) {
+		public Entity(MultipartContainer container) {
 			super(container);
 		}
 
 		public BlockPos getPos() {
-			return container.getPos();
+			return ((AbstractContainerBlockEntity)container).getPos();
 		}
 	}
 

src/test/java/net/shadowfacts/simplemultipart/test/MultipartTestMod.java

@@ -19,11 +19,13 @@ public class MultipartTestMod implements ModInitializer {
 	public static final SlabMultipart ironSlab = new SlabMultipart();
 	public static final SlabMultipart goldSlab = new SlabMultipart();
 	public static final EntityTestPart entityTest = new EntityTestPart();
+	public static final TickableEntityTestPart tickableEntityTest = new TickableEntityTestPart();
 
 	public static final ItemMultipart testItem = new ItemMultipart(testPart);
 	public static final ItemMultipart ironSlabItem = new ItemMultipart(ironSlab);
 	public static final ItemMultipart goldSlabItem  = new ItemMultipart(goldSlab);
 	public static final ItemMultipart entityTestItem = new ItemMultipart(entityTest);
+	public static final ItemMultipart tickableEntityTestItem = new ItemMultipart(tickableEntityTest);
 
 	@Override
 	public void onInitialize() {
@@ -31,6 +33,7 @@ public class MultipartTestMod implements ModInitializer {
 		registerPartAndItem("iron_slab", ironSlab, ironSlabItem);
 		registerPartAndItem("gold_slab", goldSlab, goldSlabItem);
 		registerPartAndItem("entity_test", entityTest, entityTestItem);
+		registerPartAndItem("tickable_entity_test", tickableEntityTest, tickableEntityTestItem);
 	}
 
 	private void registerPartAndItem(String name, Multipart part, Item item) {

src/test/java/net/shadowfacts/simplemultipart/test/TickableEntityTestPart.java

@@ -0,0 +1,53 @@
+package net.shadowfacts.simplemultipart.test;
+
+import net.minecraft.entity.player.PlayerEntity;
+import net.minecraft.text.StringTextComponent;
+import net.minecraft.util.Hand;
+import net.minecraft.util.Tickable;
+import net.minecraft.util.shape.VoxelShape;
+import net.minecraft.util.shape.VoxelShapes;
+import net.shadowfacts.simplemultipart.api.MultipartContainer;
+import net.shadowfacts.simplemultipart.api.MultipartView;
+import net.shadowfacts.simplemultipart.multipart.Multipart;
+import net.shadowfacts.simplemultipart.multipart.MultipartState;
+import net.shadowfacts.simplemultipart.multipart.entity.MultipartEntity;
+import net.shadowfacts.simplemultipart.multipart.entity.MultipartEntityProvider;
+
+/**
+ * @author shadowfacts
+ */
+public class TickableEntityTestPart extends Multipart implements MultipartEntityProvider {
+
+	@Override
+	@Deprecated
+	public VoxelShape getBoundingShape(MultipartState state, MultipartView view) {
+		return VoxelShapes.cube(6/16f, 6/16f, 6/16f, 10/16f, 10/16f, 10/16f);
+	}
+
+	@Override
+	@Deprecated
+	public boolean activate(MultipartState state, MultipartView view, PlayerEntity player, Hand hand) {
+		int timer = ((Entity)view.getEntity()).timer;
+		player.addChatMessage(new StringTextComponent("Timer: " + timer), false);
+		return true;
+	}
+
+	@Override
+	public MultipartEntity createMultipartEntity(MultipartState state, MultipartContainer container) {
+		return new Entity(container);
+	}
+
+	public static class Entity extends MultipartEntity implements Tickable {
+		public int timer = 0;
+
+		public Entity(MultipartContainer container) {
+			super(container);
+		}
+
+		@Override
+		public void tick() {
+			timer++;
+		}
+	}
+
+}

src/test/resources/assets/multipart_test/models/multipart/tickable_entity_test.json

@@ -0,0 +1,6 @@
+{
+	"parent": "multipart_test:multipart/center",
+	"textures": {
+		"texture": "block/redstone_block"
+	}
+}

src/test/resources/assets/multipart_test/multipartstates/tickable_entity_test.json

@@ -0,0 +1,6 @@
+{
+	"variants": {
+		"": { "model": "multipart_test:multipart/tickable_entity_test" },
+		"inventory": { "model": "multipart_test:multipart/tickable_entity_test" }
+	}
+}