9dc4d6448b
While it wasn't really "broken" before, if plugins use NMS (which they really should't be) and mess with entity management themselves, and get it wrong, they could ultimately corrupt our state expectations. I've been unable to reproduce any issues locally, but these changes are the result of me analyzing the code pretty deeply and seeing about how to make it more durable to abnormal usage. Any servers seeing oddities, please run with -Ddebug.entities=true and send me any logs triggered.
106 lines
4.7 KiB
Diff
106 lines
4.7 KiB
Diff
From 06645204746e6de3a180b5ae5c68b24645b7ba54 Mon Sep 17 00:00:00 2001
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From: CullanP <cullanpage@gmail.com>
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Date: Thu, 3 Mar 2016 02:13:38 -0600
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Subject: [PATCH] Avoid hopper searches if there are no items
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Hoppers searching for items and minecarts is the most expensive part of hopper ticking.
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We keep track of the number of minecarts and items in a chunk.
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If there are no items in the chunk, we skip searching for items.
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If there are no minecarts in the chunk, we skip searching for them.
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Usually hoppers aren't near items, so we can skip most item searches.
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And since minecart hoppers are used _very_ rarely near we can avoid alot of searching there.
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Combined, this adds up a lot.
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diff --git a/src/main/java/net/minecraft/server/Chunk.java b/src/main/java/net/minecraft/server/Chunk.java
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index a9aa13fbf8..cb56d067b9 100644
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--- a/src/main/java/net/minecraft/server/Chunk.java
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+++ b/src/main/java/net/minecraft/server/Chunk.java
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@@ -95,6 +95,10 @@ public class Chunk implements IChunkAccess {
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}
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}
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final PaperLightingQueue.LightingQueue lightingQueue = new PaperLightingQueue.LightingQueue(this);
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+ // Track the number of minecarts and items
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+ // Keep this synced with entitySlices.add() and entitySlices.remove()
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+ private final int[] itemCounts = new int[16];
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+ private final int[] inventoryEntityCounts = new int[16];
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// Paper end
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public boolean areNeighborsLoaded(final int radius) {
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switch (radius) {
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@@ -690,6 +694,13 @@ public class Chunk implements IChunkAccess {
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entity.chunkY = k;
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entity.chunkZ = this.locZ;
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this.entitySlices[k].add(entity);
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+ // Paper start
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+ if (entity instanceof EntityItem) {
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+ itemCounts[k]++;
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+ } else if (entity instanceof IInventory) {
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+ inventoryEntityCounts[k]++;
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+ }
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+ // Paper end
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}
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public void a(HeightMap.Type heightmap_type, long[] along) {
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@@ -714,6 +725,11 @@ public class Chunk implements IChunkAccess {
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if (!this.entitySlices[i].remove(entity)) {
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return;
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}
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+ if (entity instanceof EntityItem) {
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+ itemCounts[i]--;
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+ } else if (entity instanceof IInventory) {
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+ inventoryEntityCounts[i]--;
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+ }
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entityCounts.decrement(entity.getMinecraftKeyString());
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// Paper end
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}
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@@ -959,6 +975,15 @@ public class Chunk implements IChunkAccess {
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if (!this.entitySlices[k].isEmpty()) {
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Iterator iterator = this.entitySlices[k].iterator();
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+ // Paper start - Don't search for inventories if we have none, and that is all we want
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+ /*
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+ * We check if they want inventories by seeing if it is the static `IEntitySelector.c`
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+ *
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+ * Make sure the inventory selector stays in sync.
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+ * It should be the one that checks `var1 instanceof IInventory && var1.isAlive()`
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+ */
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+ if (predicate == IEntitySelector.isInventory() && inventoryEntityCounts[k] <= 0) continue;
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+ // Paper end
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while (iterator.hasNext()) {
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Entity entity1 = (Entity) iterator.next();
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@@ -995,7 +1020,18 @@ public class Chunk implements IChunkAccess {
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i = MathHelper.clamp(i, 0, this.entitySlices.length - 1);
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j = MathHelper.clamp(j, 0, this.entitySlices.length - 1);
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+ // Paper start
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+ int[] counts;
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+ if (EntityItem.class.isAssignableFrom(oclass)) {
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+ counts = itemCounts;
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+ } else if (IInventory.class.isAssignableFrom(oclass)) {
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+ counts = inventoryEntityCounts;
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+ } else {
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+ counts = null;
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+ }
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+ // Paper end
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for (int k = i; k <= j; ++k) {
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+ if (counts != null && counts[k] <= 0) continue; // Paper - Don't check a chunk if it doesn't have the type we are looking for
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Iterator iterator = this.entitySlices[k].iterator(); // Spigot
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while (iterator.hasNext()) {
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diff --git a/src/main/java/net/minecraft/server/IEntitySelector.java b/src/main/java/net/minecraft/server/IEntitySelector.java
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index bbcbb62325..f6916fd455 100644
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--- a/src/main/java/net/minecraft/server/IEntitySelector.java
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+++ b/src/main/java/net/minecraft/server/IEntitySelector.java
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@@ -11,6 +11,7 @@ public final class IEntitySelector {
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public static final Predicate<Entity> c = (entity) -> {
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return entity.isAlive() && !entity.isVehicle() && !entity.isPassenger();
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};
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+ public static final Predicate<Entity> isInventory() { return d; } // Paper - OBFHELPER
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public static final Predicate<Entity> d = (entity) -> {
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return entity instanceof IInventory && entity.isAlive();
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};
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--
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2.21.0
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