Mirror von
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synchronisiert 2024-11-15 20:40:07 +01:00
04b8268cf1
Mojang asked me to make some changes, so applied them here.
294 Zeilen
16 KiB
Diff
294 Zeilen
16 KiB
Diff
From 296dfee228fa6471e26b9d4d697ba514cf5db998 Mon Sep 17 00:00:00 2001
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From: Aikar <aikar@aikar.co>
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Date: Mon, 3 Sep 2018 22:18:38 -0400
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Subject: [PATCH] Fix concurrency and performance issues in DataFixers
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We are seeing issues with DataFixers being not thread safe in async chunks
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and even in some spigot packet sending code.
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There are a few more global objects that are mutated that need to
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be synchronized to be safe for use over multiple threads.
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There may be more cases, but these are extremely obvious ones.
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Also replaced quite a few bad uses of Map.containsKey
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containsKey is a common newbie mistake that "reads" cleaner, but
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results in double the performance cost of all map operations as
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containsKey in MOST cases where null values are not used is identical to get() == null
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Considering how deep datafixers go in call stacks, with tons of map lookups,
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this micro optimization could provide some gains.
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Additionally, many of the containsKey/get/put style operations were
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also a concurrency risk, resulting in multiple computation/insertions.
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diff --git a/src/main/java/com/mojang/datafixers/DataFixerUpper.java b/src/main/java/com/mojang/datafixers/DataFixerUpper.java
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index fb2c380f8a..a4922a35a2 100644
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--- a/src/main/java/com/mojang/datafixers/DataFixerUpper.java
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+++ b/src/main/java/com/mojang/datafixers/DataFixerUpper.java
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@@ -65,7 +65,7 @@ public class DataFixerUpper implements DataFixer {
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private final Int2ObjectSortedMap<Schema> schemas;
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private final List<DataFix> globalList;
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private final IntSortedSet fixerVersions;
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- private final Long2ObjectMap<TypeRewriteRule> rules = new Long2ObjectOpenHashMap<>();
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+ private final Long2ObjectMap<TypeRewriteRule> rules = it.unimi.dsi.fastutil.longs.Long2ObjectMaps.synchronize(new Long2ObjectOpenHashMap<>()); // Paper
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protected DataFixerUpper(final Int2ObjectSortedMap<Schema> schemas, final List<DataFix> globalList, final IntSortedSet fixerVersions) {
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this.schemas = schemas;
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@@ -125,7 +125,7 @@ public class DataFixerUpper implements DataFixer {
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final int expandedDataVersion = DataFixUtils.makeKey(dataVersion);
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final long key = (long) expandedVersion << 32 | expandedDataVersion;
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- if (!rules.containsKey(key)) {
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+ return rules.computeIfAbsent(key, k -> { // Paper
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final List<TypeRewriteRule> rules = Lists.newArrayList();
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for (final DataFix fix : globalList) {
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final int fixVersion = fix.getVersionKey();
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@@ -137,9 +137,8 @@ public class DataFixerUpper implements DataFixer {
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rules.add(fixRule);
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}
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}
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- this.rules.put(key, TypeRewriteRule.seq(rules));
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- }
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- return rules.get(key);
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+ return TypeRewriteRule.seq(rules); // Paper
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+ }); // Paper
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}
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protected IntSortedSet fixerVersions() {
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diff --git a/src/main/java/com/mojang/datafixers/NamedChoiceFinder.java b/src/main/java/com/mojang/datafixers/NamedChoiceFinder.java
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index 2c259d74e9..17481fb6e6 100644
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--- a/src/main/java/com/mojang/datafixers/NamedChoiceFinder.java
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+++ b/src/main/java/com/mojang/datafixers/NamedChoiceFinder.java
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@@ -71,8 +71,10 @@ final class NamedChoiceFinder<FT> implements OpticFinder<FT> {
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}*/
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if (targetType instanceof TaggedChoice.TaggedChoiceType<?>) {
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final TaggedChoice.TaggedChoiceType<?> choiceType = (TaggedChoice.TaggedChoiceType<?>) targetType;
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- if (choiceType.types().containsKey(name)) {
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- final Type<?> elementType = choiceType.types().get(name);
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+ // Paper start - performance - don't use containsKey
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+ final Type<?> elementType = choiceType.types().get(name);
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+ if (elementType != null) {
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+ // Paper end
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if (!Objects.equals(type, elementType)) {
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return Either.right(new Type.FieldNotFoundException(String.format("Type error for choice type \"%s\": expected type: %s, actual type: %s)", name, targetType, elementType)));
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}
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diff --git a/src/main/java/com/mojang/datafixers/functions/PointFree.java b/src/main/java/com/mojang/datafixers/functions/PointFree.java
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index 0d88490f77..4d2af956a0 100644
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--- a/src/main/java/com/mojang/datafixers/functions/PointFree.java
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+++ b/src/main/java/com/mojang/datafixers/functions/PointFree.java
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@@ -9,15 +9,19 @@ import java.util.Optional;
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import java.util.function.Function;
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public abstract class PointFree<T> {
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- private boolean initialized;
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+ private volatile boolean initialized;
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@Nullable
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private Function<DynamicOps<?>, T> value;
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@SuppressWarnings("ConstantConditions")
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public Function<DynamicOps<?>, T> evalCached() {
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if (!initialized) {
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- initialized = true;
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- value = eval();
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+ synchronized (this) {
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+ if (!initialized) {
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+ value = eval();
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+ initialized = true;
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+ }
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+ }
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}
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return value;
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}
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diff --git a/src/main/java/com/mojang/datafixers/schemas/Schema.java b/src/main/java/com/mojang/datafixers/schemas/Schema.java
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index 7c67d989e0..d81e8d1a1a 100644
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--- a/src/main/java/com/mojang/datafixers/schemas/Schema.java
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+++ b/src/main/java/com/mojang/datafixers/schemas/Schema.java
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@@ -50,8 +50,11 @@ public class Schema {
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for (final String name : TYPE_TEMPLATES.keySet()) {
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final Type<?> type;
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- if (RECURSIVE_TYPES.containsKey(name)) {
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- type = family.apply(RECURSIVE_TYPES.getInt(name));
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+ // Paper start - concurrency and performance improvement, don't use containsKey
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+ int recurseId = RECURSIVE_TYPES.getOrDefault(name, -1);
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+ if (recurseId != -1) {
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+ type = family.apply(recurseId);
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+ // Paper end
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} else {
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type = getTemplate(name).apply(family).apply(-1);
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}
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@@ -89,8 +92,11 @@ public class Schema {
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}
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public TypeTemplate id(final String name) {
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- if (RECURSIVE_TYPES.containsKey(name)) {
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- return DSL.id(RECURSIVE_TYPES.get(name));
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+ // Paper start - improve concurrency and performance
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+ int id = RECURSIVE_TYPES.getOrDefault(name, -1);
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+ if (id != -1) {
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+ return DSL.id(id);
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+ // Paper end
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}
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return getTemplate(name);
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}
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diff --git a/src/main/java/com/mojang/datafixers/types/DynamicOps.java b/src/main/java/com/mojang/datafixers/types/DynamicOps.java
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index 3c76929f24..f21531b3cd 100644
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--- a/src/main/java/com/mojang/datafixers/types/DynamicOps.java
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+++ b/src/main/java/com/mojang/datafixers/types/DynamicOps.java
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@@ -151,10 +151,10 @@ public interface DynamicOps<T> {
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default Optional<T> getGeneric(final T input, final T key) {
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return getMapValues(input).flatMap(map -> {
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- if (map.containsKey(key)) {
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- return Optional.of(map.get(key));
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- }
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- return Optional.empty();
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+ // Paper start - performance - don't use containsKey
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+ T value = map.get(key);
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+ return value != null ? Optional.of(value) : Optional.empty();
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+ // Paper end
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});
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}
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diff --git a/src/main/java/com/mojang/datafixers/types/Type.java b/src/main/java/com/mojang/datafixers/types/Type.java
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index a80e3fee91..2d5bae7a37 100644
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--- a/src/main/java/com/mojang/datafixers/types/Type.java
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+++ b/src/main/java/com/mojang/datafixers/types/Type.java
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@@ -27,8 +27,10 @@ import javax.annotation.Nullable;
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import java.util.Map;
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import java.util.Objects;
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import java.util.Optional;
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+import java.util.concurrent.CompletableFuture;
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public abstract class Type<A> implements App<Type.Mu, A> {
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+ private static final Map<Triple<Type<?>, TypeRewriteRule, PointFreeRule>, CompletableFuture<Optional<? extends RewriteResult<?, ?>>>> PENDING_REWRITE_CACHE = Maps.newConcurrentMap();
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private static final Map<Triple<Type<?>, TypeRewriteRule, PointFreeRule>, Optional<? extends RewriteResult<?, ?>>> REWRITE_CACHE = Maps.newConcurrentMap();
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public static class Mu implements K1 {}
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@@ -155,11 +157,34 @@ public abstract class Type<A> implements App<Type.Mu, A> {
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@SuppressWarnings("unchecked")
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public Optional<RewriteResult<A, ?>> rewrite(final TypeRewriteRule rule, final PointFreeRule fRule) {
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final Triple<Type<?>, TypeRewriteRule, PointFreeRule> key = Triple.of(this, rule, fRule);
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- if (!REWRITE_CACHE.containsKey(key)) {
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- final Optional<? extends RewriteResult<?, ?>> result = rule.rewrite(this).flatMap(r -> r.view().rewrite(fRule).map(view -> RewriteResult.create(view, r.recData())));
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+ // Paper start - concurrency and performance boost - this code under contention would generate multiple rewrites
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+ // rewrite this to use a CompletableFuture for pending rewrites. We can not use computeIfAbsent because this is
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+ // a recursive call that will block server startup during the Bootstrap phrase thats trying to precache these rewrites
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+ Optional<? extends RewriteResult<?, ?>> rewrite = REWRITE_CACHE.get(key);
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+ //noinspection OptionalAssignedToNull
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+ if (rewrite != null) {
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+ return (Optional<RewriteResult<A, ?>>) rewrite;
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+ }
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+ CompletableFuture<Optional<? extends RewriteResult<?, ?>>> pending;
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+ boolean needsCreate;
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+ synchronized (PENDING_REWRITE_CACHE) {
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+ pending = PENDING_REWRITE_CACHE.get(key);
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+ needsCreate = pending == null;
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+ if (pending == null) {
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+ pending = new CompletableFuture<>();
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+ PENDING_REWRITE_CACHE.put(key, pending);
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+ }
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+ }
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+ if (needsCreate) {
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+ Optional<RewriteResult<A, ?>> result = rule.rewrite(this).flatMap(r -> r.view().rewrite(fRule).map(view -> RewriteResult.create(view, r.recData())));
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REWRITE_CACHE.put(key, result);
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+ pending.complete(result);
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+ PENDING_REWRITE_CACHE.remove(key);
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+ return result;
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+ } else {
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+ return (Optional<RewriteResult<A, ?>>) pending.join();
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}
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- return (Optional<RewriteResult<A, ?>>) REWRITE_CACHE.get(key);
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+ // Paper end
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}
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public <FT, FR> Type<?> getSetType(final OpticFinder<FT> optic, final Type<FR> newType) {
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diff --git a/src/main/java/com/mojang/datafixers/types/families/RecursiveTypeFamily.java b/src/main/java/com/mojang/datafixers/types/families/RecursiveTypeFamily.java
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index 4a1f906837..93c2f565fd 100644
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--- a/src/main/java/com/mojang/datafixers/types/families/RecursiveTypeFamily.java
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+++ b/src/main/java/com/mojang/datafixers/types/families/RecursiveTypeFamily.java
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@@ -32,7 +32,7 @@ public final class RecursiveTypeFamily implements TypeFamily {
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private final TypeTemplate template;
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private final int size;
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- private final Int2ObjectMap<RecursivePoint.RecursivePointType<?>> types = new Int2ObjectOpenHashMap<>();
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+ private final Int2ObjectMap<RecursivePoint.RecursivePointType<?>> types = it.unimi.dsi.fastutil.ints.Int2ObjectMaps.synchronize(new Int2ObjectOpenHashMap<>()); // Paper
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private final int hashCode;
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public RecursiveTypeFamily(final String name, final TypeTemplate template) {
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diff --git a/src/main/java/com/mojang/datafixers/types/templates/Tag.java b/src/main/java/com/mojang/datafixers/types/templates/Tag.java
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index ece3fb5f88..396637bbd1 100644
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--- a/src/main/java/com/mojang/datafixers/types/templates/Tag.java
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+++ b/src/main/java/com/mojang/datafixers/types/templates/Tag.java
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@@ -173,8 +173,10 @@ public final class Tag implements TypeTemplate {
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public <T> Pair<T, Optional<A>> read(final DynamicOps<T> ops, final T input) {
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final Optional<Map<T, T>> map = ops.getMapValues(input);
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final T nameObject = ops.createString(name);
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- if (map.isPresent() && map.get().containsKey(nameObject)) {
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- final T elementValue = map.get().get(nameObject);
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+ // Paper start - performance - don't use containsKey
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+ final T elementValue;
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+ if (map.isPresent() && (elementValue = map.get().get(nameObject)) != null) {
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+ // Paper end
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final Optional<A> value = element.read(ops, elementValue).getSecond();
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if (value.isPresent()) {
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return Pair.of(ops.createMap(map.get().entrySet().stream().filter(e -> !Objects.equals(e.getKey(), nameObject)).collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue))), value);
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diff --git a/src/main/java/com/mojang/datafixers/types/templates/TaggedChoice.java b/src/main/java/com/mojang/datafixers/types/templates/TaggedChoice.java
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index e6dd31233a..77d64362b1 100644
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--- a/src/main/java/com/mojang/datafixers/types/templates/TaggedChoice.java
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+++ b/src/main/java/com/mojang/datafixers/types/templates/TaggedChoice.java
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@@ -187,17 +187,25 @@ public final class TaggedChoice<K> implements TypeTemplate {
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if (values.isPresent()) {
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final Map<T, T> map = values.get();
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final T nameObject = ops.createString(name);
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- if (map.containsKey(nameObject)) {
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- final Optional<K> key = keyType.read(ops, map.get(nameObject)).getSecond();
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- if (!key.isPresent() || !types.containsKey(key.get())) {
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+ // Paper start - performance - don't use containsKey
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+ T mapValue = map.get(nameObject);
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+ if (mapValue != null) {
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+ final Optional<K> key = keyType.read(ops, mapValue).getSecond();
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+ // also skip containsKey here
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+ //noinspection OptionalIsPresent
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+ K keyValue = key.isPresent() ? key.get() : null;
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+ Type<?> type = keyValue != null ? types.get(keyValue) : null;
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+ if (type == null) {
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if (DataFixerUpper.ERRORS_ARE_FATAL) {
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- throw new IllegalArgumentException("Unsupported key: " + key.get() + " in " + this);
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+ throw new IllegalArgumentException("Unsupported key: " + keyValue + " in " + this);
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} else {
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- LOGGER.warn("Unsupported key: {} in {}", key.get(), this);
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+ LOGGER.warn("Unsupported key: {} in {}", keyValue, this);
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return Pair.of(input, Optional.empty());
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}
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}
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- return types.get(key.get()).read(ops, input).mapSecond(vo -> vo.map(v -> Pair.of(key.get(), v)));
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+
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+ return type.read(ops, input).mapSecond(vo -> vo.map(v -> Pair.of(keyValue, v)));
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+ // Paper end
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}
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}
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return Pair.of(input, Optional.empty());
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@@ -205,12 +213,14 @@ public final class TaggedChoice<K> implements TypeTemplate {
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@Override
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public <T> T write(final DynamicOps<T> ops, final T rest, final Pair<K, ?> value) {
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- if (!types.containsKey(value.getFirst())) {
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+ // Paper start - performance - don't use containsKey
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+ final Type<?> type = types.get(value.getFirst());
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+ if (type == null) {
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// TODO: better error handling?
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// TODO: See todo in read method
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throw new IllegalArgumentException("Unsupported key: " + value.getFirst() + " in " + this);
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}
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- final Type<?> type = types.get(value.getFirst());
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+ // Paper end
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return capWrite(ops, type, value.getFirst(), value.getSecond(), rest);
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}
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--
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2.19.1
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