From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Mon, 6 Jul 2020 18:36:41 -0400
Subject: [PATCH] Fix Concurrency issue in WeightedList
if multiple threads from worldgen sort at same time, it will crash.
So make a copy of the list for sorting purposes.
diff --git a/src/main/java/net/minecraft/world/entity/ai/behavior/GateBehavior.java b/src/main/java/net/minecraft/world/entity/ai/behavior/GateBehavior.java
index 0a65e442ddc31c06f3bb0ff5aa152daee7a210af..a81ad258b39b7472312ab1bedeeacaf26ffae4f7 100644
--- a/src/main/java/net/minecraft/world/entity/ai/behavior/GateBehavior.java
+++ b/src/main/java/net/minecraft/world/entity/ai/behavior/GateBehavior.java
@@ -17,7 +17,7 @@ public class GateBehavior<E extends LivingEntity> extends Behavior<E> {
private final Set<MemoryModuleType<?>> exitErasedMemories;
private final GateBehavior.OrderPolicy orderPolicy;
private final GateBehavior.RunningPolicy runningPolicy;
- private final WeightedList<Behavior<? super E>> behaviors = new WeightedList<>();
+ private final WeightedList<Behavior<? super E>> behaviors = new WeightedList<>(false); // Paper - don't use a clone
public GateBehavior(Map<MemoryModuleType<?>, MemoryStatus> requiredMemoryState, Set<MemoryModuleType<?>> memoriesToForgetWhenStopped, GateBehavior.OrderPolicy order, GateBehavior.RunningPolicy runMode, List<Pair<Behavior<? super E>, Integer>> tasks) {
super(requiredMemoryState);
@@ -65,10 +65,9 @@ public class GateBehavior<E extends LivingEntity> extends Behavior<E> {
}).forEach((behavior) -> {
behavior.g(world, entity, time);
});
- Set set = this.exitErasedMemories;
Brain behaviorcontroller = entity.getBrain();
- set.forEach(behaviorcontroller::removeMemory);
+ this.exitErasedMemories.forEach(behaviorcontroller::eraseMemory); // Paper - decomp fix
}
@Override
@@ -111,11 +110,11 @@ public class GateBehavior<E extends LivingEntity> extends Behavior<E> {
static enum OrderPolicy {
ORDERED((weightedlist) -> {
- }), SHUFFLED(WeightedList::a);
+ }), SHUFFLED(WeightedList::shuffle);
private final Consumer<WeightedList<?>> consumer;
- private OrderPolicy(Consumer consumer) {
+ private OrderPolicy(Consumer<WeightedList<?>> consumer) { // Paper - decomp fix
this.consumer = consumer;
}
diff --git a/src/main/java/net/minecraft/world/entity/ai/behavior/WeightedList.java b/src/main/java/net/minecraft/world/entity/ai/behavior/WeightedList.java
index e4c1c58e9a9c744c7ebb9948a27766b84a081b9e..85df30ef7c03c2f8ae741a8cac8bf601490d2539 100644
--- a/src/main/java/net/minecraft/world/entity/ai/behavior/WeightedList.java
+++ b/src/main/java/net/minecraft/world/entity/ai/behavior/WeightedList.java
@@ -6,7 +6,7 @@ import com.mojang.serialization.Codec;
import com.mojang.serialization.DataResult;
import com.mojang.serialization.Dynamic;
import com.mojang.serialization.DynamicOps;
-import com.mojang.serialization.OptionalDynamic;
+
import java.util.Comparator;
import java.util.List;
import java.util.Random;
@@ -14,26 +14,32 @@ import java.util.stream.Stream;
public class WeightedList<U> {
- protected final List<WeightedList.WeightedEntry<U>> entries;
+ protected final List<WeightedList.WeightedEntry<U>> list; // Paper - decompile conflict
private final Random random;
+ private final boolean isUnsafe; // Paper
- public WeightedList() {
- this(Lists.newArrayList());
+ // Paper start - add useClone option
+ public WeightedList() { this(true); }
+ public WeightedList(boolean isUnsafe) {
+ this(Lists.newArrayList(), isUnsafe);
}
- private WeightedList(List<WeightedList.WeightedEntry<U>> entries) {
+ private WeightedList(List<WeightedList.WeightedEntry<U>> entries) { this(entries, true); }
+ private WeightedList(List<WeightedList.WeightedEntry<U>> list, boolean isUnsafe) {
+ this.isUnsafe = isUnsafe;
+ // Paper end
this.random = new Random();
- this.entries = Lists.newArrayList(entries);
+ this.list = Lists.newArrayList(list); // Paper - decompile conflict
}
public static <U> Codec<WeightedList<U>> codec(Codec<U> codec) {
- return WeightedList.entries.a(codec).listOf().xmap(WeightedList::new, (weightedlist) -> {
- return weightedlist.a;
+ return WeightedList.WeightedEntry.codec(codec).listOf().xmap(WeightedList::new, (weightedlist) -> { // Paper - decompile conflict
+ return weightedlist.list; // Paper - decompile conflict
});
}
public WeightedList<U> add(U item, int weight) {
- this.entries.add(new WeightedList.WeightedEntry<>(item, weight));
+ this.list.add(new WeightedList.WeightedEntry<>(item, weight)); // Paper - decompile conflict
return this;
}
@@ -42,21 +48,20 @@ public class WeightedList<U> {
}
public WeightedList<U> shuffle(Random random) {
- this.entries.forEach((weightedlist_a) -> {
- weightedlist_a.setRandom(random.nextFloat());
- });
- this.entries.sort(Comparator.comparingDouble((object) -> {
- return ((WeightedList.WeightedEntry) object).getRandWeight();
- }));
- return this;
+ // Paper start - make concurrent safe, work off a clone of the list
+ List<WeightedList.WeightedEntry<U>> list = isUnsafe ? new java.util.ArrayList<WeightedList.WeightedEntry<U>>(this.list) : this.list;
+ list.forEach((weightedlist_a) -> weightedlist_a.setRandom(random.nextFloat()));
+ list.sort(Comparator.comparingDouble(WeightedEntry::getRandWeight));
+ return isUnsafe ? new WeightedList<>(list, isUnsafe) : this;
+ // Paper end
}
public boolean isEmpty() {
- return this.entries.isEmpty();
+ return this.list.isEmpty(); // Paper - decompile conflict
}
public Stream<U> stream() {
- return this.entries.stream().map(WeightedList.entries::a);
+ return this.list.stream().map(WeightedList.WeightedEntry::getData); // Paper - decompile conflict
}
public U getOne(Random random) {
@@ -64,7 +69,7 @@ public class WeightedList<U> {
}
public String toString() {
- return "WeightedList[" + this.entries + "]";
+ return "WeightedList[" + this.list + "]"; // Paper - decompile conflict
}
public static class WeightedEntry<T> {
@@ -98,11 +103,7 @@ public class WeightedList<U> {
return new Codec<WeightedList.WeightedEntry<E>>() {
public <T> DataResult<Pair<WeightedList.WeightedEntry<E>, T>> decode(DynamicOps<T> dynamicops, T t0) {
Dynamic<T> dynamic = new Dynamic(dynamicops, t0);
- OptionalDynamic optionaldynamic = dynamic.get("data");
- Codec codec1 = codec;
-
- codec.getClass();
- return optionaldynamic.flatMap(codec1::parse).map((object) -> {
+ return dynamic.get("data").flatMap(codec::parse).map((object) -> { // Paper - decompile error
return new WeightedList.WeightedEntry<>(object, dynamic.get("weight").asInt(1));
}).map((weightedlist_a) -> {
return Pair.of(weightedlist_a, dynamicops.empty());