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8c5b837e05
Firstly, the old methods all routed to the CompletableFuture method. However, the CF method could not guarantee that if the caller was off-main that the future would be "completed" on-main. Since the callback methods used the CF one, this meant that the callback methods did not guarantee that the callbacks were to be called on the main thread. Now, all methods route to getChunkAtAsync(x, z, gen, urgent, cb) so that the methods with the callback are guaranteed to invoke the callback on the main thread. The CF behavior remains unchanged; it may still appear to complete on main if invoked off-main. Secondly, remove the scheduleOnMain invocation in the async chunk completion. This unnecessarily delays the callback by 1 tick. Thirdly, add getChunksAtAsync(minX, minZ, maxX, maxZ, ...) which will load chunks within an area. This method is provided as a helper as keeping all chunks loaded within an area can be complicated to implement for plugins (due to the lacking ticket API), and is already implemented internally anyways. Fourthly, remove the ticket addition that occured with getChunkAt and getChunkAtAsync. The ticket addition may delay the unloading of the chunk unnecessarily. It also fixes a very rare timing bug where the future/callback would be completed after the chunk unloads.
41 lines
2.5 KiB
Diff
41 lines
2.5 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Jake Potrebic <jake.m.potrebic@gmail.com>
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Date: Sun, 10 Jul 2022 14:13:22 -0700
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Subject: [PATCH] Don't use level random in entity constructors
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Paper makes the entity random thread-safe
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and constructing an entity off the main thread
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should be supported. Some entities (for whatever
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reason) use the level's random in some places.
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diff --git a/src/main/java/net/minecraft/world/entity/item/ItemEntity.java b/src/main/java/net/minecraft/world/entity/item/ItemEntity.java
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index 586257fe5c9f5cddd0ed164254f46777c6e71d66..d555fd0b200c012f30ed0c0ec09a37b25a737b76 100644
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--- a/src/main/java/net/minecraft/world/entity/item/ItemEntity.java
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+++ b/src/main/java/net/minecraft/world/entity/item/ItemEntity.java
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@@ -72,7 +72,12 @@ public class ItemEntity extends Entity implements TraceableEntity {
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}
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public ItemEntity(Level world, double x, double y, double z, ItemStack stack) {
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- this(world, x, y, z, stack, world.random.nextDouble() * 0.2D - 0.1D, 0.2D, world.random.nextDouble() * 0.2D - 0.1D);
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+ // Paper start - Don't use level random in entity constructors (to make them thread-safe)
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+ this(EntityType.ITEM, world);
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+ this.setPos(x, y, z);
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+ this.setDeltaMovement(this.random.nextDouble() * 0.2D - 0.1D, 0.2D, this.random.nextDouble() * 0.2D - 0.1D);
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+ this.setItem(stack);
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+ // Paper end - Don't use level random in entity constructors
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}
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public ItemEntity(Level world, double x, double y, double z, ItemStack stack, double velocityX, double velocityY, double velocityZ) {
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diff --git a/src/main/java/net/minecraft/world/entity/item/PrimedTnt.java b/src/main/java/net/minecraft/world/entity/item/PrimedTnt.java
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index 45c224198135e48f94dc72312c805bf451bf7b0e..de87483600e55d88176fe25db621bbd3e464729f 100644
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--- a/src/main/java/net/minecraft/world/entity/item/PrimedTnt.java
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+++ b/src/main/java/net/minecraft/world/entity/item/PrimedTnt.java
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@@ -68,7 +68,7 @@ public class PrimedTnt extends Entity implements TraceableEntity {
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public PrimedTnt(Level world, double x, double y, double z, @Nullable LivingEntity igniter) {
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this(EntityType.TNT, world);
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this.setPos(x, y, z);
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- double d3 = world.random.nextDouble() * 6.2831854820251465D;
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+ double d3 = this.random.nextDouble() * 6.2831854820251465D; // Paper - Don't use level random in entity constructors
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this.setDeltaMovement(-Math.sin(d3) * 0.02D, 0.20000000298023224D, -Math.cos(d3) * 0.02D);
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this.setFuse(80);
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