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Optimize Dynamic#get Missing Keys 

get was calling toString() on every NBT object that was ever asked for an optional
key from the object to build a string for the error text.

When done on large NBT objects, this was using a ton of computation time building the
JSON representation of the NBT object.

Now we will just skip the value when 99.9999% of the time the text is never even printed.
This commit is contained in:
Aikar 2020-12-21 11:03:36 -05:00
parent abca14ff96
commit c83a661f6e
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2 changed files with 35 additions and 0 deletions
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34
Spigot-Server-Patches/0619-Optimize-Dynamic-get-Missing-Keys.patch Normal file
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@ -0,0 +1,34 @@
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Mon, 21 Dec 2020 11:01:42 -0500
Subject: [PATCH] Optimize Dynamic#get Missing Keys
get was calling toString() on every NBT object that was ever asked for an optional
key from the object to build a string for the error text.
When done on large NBT objects, this was using a ton of computation time building the
JSON representation of the NBT object.
Now we will just skip the value when 99.9999% of the time the text is never even printed.
diff --git a/src/main/java/com/mojang/serialization/Dynamic.java b/src/main/java/com/mojang/serialization/Dynamic.java
index a75d3db046dc985a03b4b870c91f41de1bd66bad..044facc9de9e8e582d7953d681c0c051578979c3 100644
--- a/src/main/java/com/mojang/serialization/Dynamic.java
+++ b/src/main/java/com/mojang/serialization/Dynamic.java
@@ -17,6 +17,7 @@ import java.util.stream.Stream;
@SuppressWarnings("unused")
public class Dynamic<T> extends DynamicLike<T> {
+ private static final boolean DEBUG_MISSING_KEYS = Boolean.getBoolean("Paper.debugDynamicMissingKeys"); // Paper
private final T value;
public Dynamic(final DynamicOps<T> ops) {
@@ -113,7 +114,7 @@ public class Dynamic<T> extends DynamicLike<T> {
return new OptionalDynamic<>(ops, ops.getMap(value).flatMap(m -> {
final T value = m.get(key);
if (value == null) {
- return DataResult.error("key missing: " + key + " in " + this.value);
+ return DataResult.error(DEBUG_MISSING_KEYS ? "key missing: " + key + " in " + this.value : "key missing: " + key); // Paper
}
return DataResult.success(new Dynamic<>(ops, value));
}));

1
scripts/importmcdev.sh
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@ -108,6 +108,7 @@ importLibrary com.mojang authlib com/mojang/authlib yggdrasil/YggdrasilGameProfi
importLibrary com.mojang datafixerupper com/mojang/datafixers DataFixerBuilder.java
importLibrary com.mojang datafixerupper com/mojang/datafixers/util Either.java
importLibrary com.mojang datafixerupper com/mojang/serialization/codecs KeyDispatchCodec.java
importLibrary com.mojang datafixerupper com/mojang/serialization Dynamic.java
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