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PreCreatureSpawnEvent

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Adds an event to fire before an Entity is created, so that plugins that need to cancel
CreatureSpawnEvent can do so from this event instead.

Cancelling CreatureSpawnEvent rapidly causes a lot of garbage collection and CPU waste
as it's done after the Entity object has been fully created.

Mob Limiting plugins and blanket "ban this type of monster" plugins should use this event
instead and save a lot of server resources.

See: https://github.com/PaperMC/Paper/issues/917
This commit is contained in:
Aikar
2018-01-14 17:01:31 -05:00
parent 3620489699
commit cad0c129c8
5 changed files with 115 additions and 17 deletions
Download Patch File Download Diff File Expand all files Collapse all files

59
paper-server/patches/sources/net/minecraft/world/level/NaturalSpawner.java.patch
View File

@@ -48,7 +48,22 @@
list.add(enumcreaturetype);
}
}
@@ -217,10 +238,15 @@
@@ -207,7 +228,13 @@
j1 = biomesettingsmobs_c.minCount + world.random.nextInt(1 + biomesettingsmobs_c.maxCount - biomesettingsmobs_c.minCount);
}
- if (NaturalSpawner.isValidSpawnPostitionForType(world, group, structuremanager, chunkgenerator, biomesettingsmobs_c, blockposition_mutableblockposition, d2) && checker.test(biomesettingsmobs_c.type, blockposition_mutableblockposition, chunk)) {
+ // Paper start - PreCreatureSpawnEvent
+ PreSpawnStatus doSpawning = isValidSpawnPostitionForType(world, group, structuremanager, chunkgenerator, biomesettingsmobs_c, blockposition_mutableblockposition, d2);
+ if (doSpawning == PreSpawnStatus.ABORT) {
+ return;
+ }
+ if (doSpawning == PreSpawnStatus.SUCCESS && checker.test(biomesettingsmobs_c.type, blockposition_mutableblockposition, chunk)) {
+ // Paper end - PreCreatureSpawnEvent
Mob entityinsentient = NaturalSpawner.getMobForSpawn(world, biomesettingsmobs_c.type);
if (entityinsentient == null) {
@@ -217,10 +244,15 @@
entityinsentient.moveTo(d0, (double) i, d1, world.random.nextFloat() * 360.0F, 0.0F);
if (NaturalSpawner.isValidPositionForMob(world, entityinsentient, d2)) {
groupdataentity = entityinsentient.finalizeSpawn(world, world.getCurrentDifficultyAt(entityinsentient.blockPosition()), EntitySpawnReason.NATURAL, groupdataentity);
@@ -68,7 +83,41 @@
if (j >= entityinsentient.getMaxSpawnClusterSize()) {
return;
}
@@ -268,6 +294,7 @@
@@ -250,10 +282,31 @@
return squaredDistance <= 576.0D ? false : (world.getSharedSpawnPos().closerToCenterThan(new Vec3((double) pos.getX() + 0.5D, (double) pos.getY(), (double) pos.getZ() + 0.5D), 24.0D) ? false : Objects.equals(new ChunkPos(pos), chunk.getPos()) || world.isNaturalSpawningAllowed((BlockPos) pos));
}
- private static boolean isValidSpawnPostitionForType(ServerLevel world, MobCategory group, StructureManager structureAccessor, ChunkGenerator chunkGenerator, MobSpawnSettings.SpawnerData spawnEntry, BlockPos.MutableBlockPos pos, double squaredDistance) {
+ // Paper start - PreCreatureSpawnEvent
+ private enum PreSpawnStatus {
+ FAIL,
+ SUCCESS,
+ CANCELLED,
+ ABORT
+ }
+ private static PreSpawnStatus isValidSpawnPostitionForType(ServerLevel world, MobCategory group, StructureManager structureAccessor, ChunkGenerator chunkGenerator, MobSpawnSettings.SpawnerData spawnEntry, BlockPos.MutableBlockPos pos, double squaredDistance) {
+ // Paper end - PreCreatureSpawnEvent
EntityType<?> entitytypes = spawnEntry.type;
- return entitytypes.getCategory() == MobCategory.MISC ? false : (!entitytypes.canSpawnFarFromPlayer() && squaredDistance > (double) (entitytypes.getCategory().getDespawnDistance() * entitytypes.getCategory().getDespawnDistance()) ? false : (entitytypes.canSummon() && NaturalSpawner.canSpawnMobAt(world, structureAccessor, chunkGenerator, group, spawnEntry, pos) ? (!SpawnPlacements.isSpawnPositionOk(entitytypes, world, pos) ? false : (!SpawnPlacements.checkSpawnRules(entitytypes, world, EntitySpawnReason.NATURAL, pos, world.random) ? false : world.noCollision(entitytypes.getSpawnAABB((double) pos.getX() + 0.5D, (double) pos.getY(), (double) pos.getZ() + 0.5D)))) : false));
+ // Paper start - PreCreatureSpawnEvent
+ com.destroystokyo.paper.event.entity.PreCreatureSpawnEvent event = new com.destroystokyo.paper.event.entity.PreCreatureSpawnEvent(
+ io.papermc.paper.util.MCUtil.toLocation(world, pos),
+ org.bukkit.craftbukkit.entity.CraftEntityType.minecraftToBukkit(entitytypes), SpawnReason.NATURAL
+ );
+ if (!event.callEvent()) {
+ if (event.shouldAbortSpawn()) {
+ return PreSpawnStatus.ABORT;
+ }
+ return PreSpawnStatus.CANCELLED;
+ }
+ // Paper end - PreCreatureSpawnEvent
+
+ return entitytypes.getCategory() == MobCategory.MISC ? PreSpawnStatus.FAIL : (!entitytypes.canSpawnFarFromPlayer() && squaredDistance > (double) (entitytypes.getCategory().getDespawnDistance() * entitytypes.getCategory().getDespawnDistance()) ? PreSpawnStatus.FAIL : (entitytypes.canSummon() && NaturalSpawner.canSpawnMobAt(world, structureAccessor, chunkGenerator, group, spawnEntry, pos) ? (!SpawnPlacements.isSpawnPositionOk(entitytypes, world, pos) ? PreSpawnStatus.FAIL : (!SpawnPlacements.checkSpawnRules(entitytypes, world, EntitySpawnReason.NATURAL, pos, world.random) ? PreSpawnStatus.FAIL : world.noCollision(entitytypes.getSpawnAABB((double) pos.getX() + 0.5D, (double) pos.getY(), (double) pos.getZ() + 0.5D)) ? PreSpawnStatus.SUCCESS : PreSpawnStatus.FAIL)) : PreSpawnStatus.FAIL)); // Paper - PreCreatureSpawnEvent
}
@Nullable
@@ -268,6 +321,7 @@
NaturalSpawner.LOGGER.warn("Can't spawn entity of type: {}", BuiltInRegistries.ENTITY_TYPE.getKey(type));
} catch (Exception exception) {
NaturalSpawner.LOGGER.warn("Failed to create mob", exception);
@@ -76,7 +125,7 @@
}
return null;
@@ -356,6 +383,7 @@
@@ -356,6 +410,7 @@
entity = biomesettingsmobs_c.type.create(world.getLevel(), EntitySpawnReason.NATURAL);
} catch (Exception exception) {
NaturalSpawner.LOGGER.warn("Failed to create mob", exception);
@@ -84,7 +133,7 @@
continue;
}
@@ -369,7 +397,7 @@
@@ -369,7 +424,7 @@
if (entityinsentient.checkSpawnRules(world, EntitySpawnReason.CHUNK_GENERATION) && entityinsentient.checkSpawnObstruction(world)) {
groupdataentity = entityinsentient.finalizeSpawn(world, world.getCurrentDifficultyAt(entityinsentient.blockPosition()), EntitySpawnReason.CHUNK_GENERATION, groupdataentity);
@@ -93,7 +142,7 @@
flag = true;
}
}
@@ -482,10 +510,12 @@
@@ -482,10 +537,12 @@
return this.unmodifiableMobCategoryCounts;
}