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Optimize Pathfinder - Remove Streams / Optimized collections

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I utilized the IDE to convert streams to non streams code, so shouldn't
be any risk of behavior change. Only did minor optimization of the
generated code set to remove unnecessary things.

I expect us to just drop this patch on next major update and re-apply
it with the IDE again and re-apply the collections optimization.

Optimize collection by creating a list instead of a set of the key and value.

This lets us get faster foreach iteration, as well as avoids map lookups on
the values when needed.
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Aikar 2020-05-11 04:24:38 -04:00
parent fc917d1687
commit 7a7c429260
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1 changed files with 162 additions and 0 deletions
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@ -0,0 +1,162 @@
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Mon, 11 May 2020 04:18:54 -0400
Subject: [PATCH] Optimize Pathfinder - Remove Streams / Optimized collections
I utilized the IDE to convert streams to non streams code, so shouldn't
be any risk of behavior change. Only did minor optimization of the
generated code set to remove unnecessary things.
I expect us to just drop this patch on next major update and re-apply
it with the IDE again and re-apply the collections optimization.
Optimize collection by creating a list instead of a set of the key and value.
This lets us get faster foreach iteration, as well as avoids map lookups on
the values when needed.
diff --git a/src/main/java/net/minecraft/server/Pathfinder.java b/src/main/java/net/minecraft/server/Pathfinder.java
index 67c63cfe333e328cbd00ada970bd81efebfe30b6..ae6594ea853e08085aa65bd884d4211d2bf28d16 100644
--- a/src/main/java/net/minecraft/server/Pathfinder.java
+++ b/src/main/java/net/minecraft/server/Pathfinder.java
@@ -31,9 +31,15 @@ public class Pathfinder {
this.a.a();
this.e.a(chunkcache, entityinsentient);
PathPoint pathpoint = this.e.b();
- Map<PathDestination, BlockPosition> map = (Map) set.stream().collect(Collectors.toMap((blockposition) -> {
- return this.e.a((double) blockposition.getX(), (double) blockposition.getY(), (double) blockposition.getZ());
- }, Function.identity()));
+ // Paper start - remove streams - and optimize collection
+ List<Map.Entry<PathDestination, BlockPosition>> map = new java.util.ArrayList<>();
+ for (BlockPosition blockposition : set) {
+ // cast is important
+ //noinspection RedundantCast
+ PathDestination path = this.e.a((double) blockposition.getX(), (double) blockposition.getY(), (double) blockposition.getZ());
+ map.add(new java.util.AbstractMap.SimpleEntry<>(path, blockposition));
+ }
+ // Paper end
PathEntity pathentity = this.a(pathpoint, map, f, i, f1);
this.e.a();
@@ -41,11 +47,11 @@ public class Pathfinder {
}
@Nullable
- private PathEntity a(PathPoint pathpoint, Map<PathDestination, BlockPosition> map, float f, int i, float f1) {
- Set<PathDestination> set = map.keySet();
+ private PathEntity a(PathPoint pathpoint, java.util.List<java.util.Map.Entry<PathDestination, BlockPosition>> list, float f, int i, float f1) { // Paper - list instead of set
+ //Set<PathDestination> set = map.keySet(); // Paper
pathpoint.e = 0.0F;
- pathpoint.f = this.a(pathpoint, set);
+ pathpoint.f = this.a(pathpoint, list); // Paper - list instead of map
pathpoint.g = pathpoint.f;
this.a.a();
this.b.clear();
@@ -62,10 +68,23 @@ public class Pathfinder {
PathPoint pathpoint1 = this.a.c();
pathpoint1.i = true;
- set.stream().filter((pathdestination) -> {
- return pathpoint1.c((PathPoint) pathdestination) <= (float) i;
- }).forEach(PathDestination::e);
- if (set.stream().anyMatch(PathDestination::f)) {
+ // Paper start - remove streams
+ for (int i1 = 0, listSize = list.size(); i1 < listSize; i1++) {
+ PathDestination pathdestination = list.get(i1).getKey();
+ if (pathpoint1.c(pathdestination) <= (float) i) {
+ pathdestination.e();
+ }
+ }
+ boolean result = false;
+ for (int i1 = 0, listSize = list.size(); i1 < listSize; i1++) {
+ PathDestination pathdestination = list.get(i1).getKey();
+ if (pathdestination.f()) {
+ result = true;
+ break;
+ }
+ }
+ if (result) {
+ // Paper end
break;
}
@@ -82,7 +101,7 @@ public class Pathfinder {
if (pathpoint2.j < f && (!pathpoint2.c() || f3 < pathpoint2.e)) {
pathpoint2.h = pathpoint1;
pathpoint2.e = f3;
- pathpoint2.f = this.a(pathpoint2, set) * 1.5F;
+ pathpoint2.f = this.a(pathpoint2, list) * 1.5F; // Paper - use list instead of map
if (pathpoint2.c()) {
this.a.a(pathpoint2, pathpoint2.e + pathpoint2.f);
} else {
@@ -94,36 +113,49 @@ public class Pathfinder {
}
}
- Stream stream;
- if (set.stream().anyMatch(PathDestination::f)) {
- stream = set.stream().filter(PathDestination::f).map((pathdestination) -> {
- return this.a(pathdestination.d(), (BlockPosition) map.get(pathdestination), true);
- }).sorted(Comparator.comparingInt(PathEntity::e));
- } else {
- stream = set.stream().map((pathdestination) -> {
- return this.a(pathdestination.d(), (BlockPosition) map.get(pathdestination), false);
- }).sorted(Comparator.comparingDouble(PathEntity::l).thenComparingInt(PathEntity::e));
+ // Paper start - remove streams
+ boolean result = false;
+ for (int i1 = 0, listSize = list.size(); i1 < listSize; i1++) {
+ PathDestination pathDestination = list.get(i1).getKey(); // Paper
+ if (pathDestination.f()) {
+ result = true;
+ break;
+ }
}
-
- Optional<PathEntity> optional = stream.findFirst();
-
- if (!optional.isPresent()) {
- return null;
+ List<PathEntity> candidates = new java.util.ArrayList<>();
+ if (result) {
+ for (int i1 = 0, listSize = list.size(); i1 < listSize; i1++) {
+ Map.Entry<PathDestination, BlockPosition> entry = list.get(i1);
+ PathDestination pathdestination = entry.getKey();
+ if (pathdestination.f()) {
+ PathEntity pathEntity = this.a(pathdestination.d(), entry.getValue(), true);
+ candidates.add(pathEntity);
+ }
+ }
+ if (candidates.isEmpty()) return null;
+ candidates.sort(Comparator.comparingInt(PathEntity::e));
} else {
- PathEntity pathentity = (PathEntity) optional.get();
-
- return pathentity;
+ for (int i1 = 0, listSize = list.size(); i1 < listSize; i1++) {
+ Map.Entry<PathDestination, BlockPosition> entry = list.get(i1);
+ PathDestination pathdestination = entry.getKey();
+ PathEntity pathEntity = this.a(pathdestination.d(), entry.getValue(), false);
+ candidates.add(pathEntity);
+ }
+ if (candidates.isEmpty()) return null;
+ candidates.sort(Comparator.comparingDouble(PathEntity::l).thenComparingInt(PathEntity::e));
}
+ return candidates.get(0);
+ // Paper end
}
- private float a(PathPoint pathpoint, Set<PathDestination> set) {
+ private float a(PathPoint pathpoint, java.util.List<java.util.Map.Entry<PathDestination, BlockPosition>> list) {
float f = Float.MAX_VALUE;
float f1;
- for (Iterator iterator = set.iterator(); iterator.hasNext(); f = Math.min(f1, f)) {
- PathDestination pathdestination = (PathDestination) iterator.next();
+ for (int i = 0, listSize = list.size(); i < listSize; i++) { // Paper
+ PathDestination pathdestination = list.get(i).getKey(); // Paper
f1 = pathpoint.a(pathdestination);
pathdestination.a(f1, pathpoint);