Paper/patches/unapplied/server/0294-Block-Entity-remove-from-being-called-on-Players.patch

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Zach Brown <zach@zachbr.io>
Date: Mon, 4 Feb 2019 23:33:24 -0500
Subject: [PATCH] Block Entity#remove from being called on Players
This doesn't result in the same behavior as other entities and causes
several problems. Anyone ever complain about the "Cannot send chat
message" thing? That's one of the issues this causes, among others.
If a plugin developer can come up with a valid reason to call this on a
Player we will look at limiting the scope of this change. It appears to
be unintentional in the few cases we've seen so far.
diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
index e31de5e408b01c2e67d2feec4020796fa74b24d8..cdc4ef88c8369b3bd1c607ff5301fc1b04ec4582 100644
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--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
Rewrite chunk system (#8177) Patch documentation to come Issues with the old system that are fixed now: - World generation does not scale with cpu cores effectively. - Relies on the main thread for scheduling and maintaining chunk state, dropping chunk load/generate rates at lower tps. - Unreliable prioritisation of chunk gen/load calls that block the main thread. - Shutdown logic is utterly unreliable, as it has to wait for all chunks to unload - is it guaranteed that the chunk system is in a state on shutdown that it can reliably do this? Watchdog shutdown also typically failed due to thread checks, which is now resolved. - Saving of data is not unified (i.e can save chunk data without saving entity data, poses problems for desync if shutdown is really abnormal. - Entities are not loaded with chunks. This caused quite a bit of headache for Chunk#getEntities API, but now the new chunk system loads entities with chunks so that they are ready whenever the chunk loads in. Effectively brings the behavior back to 1.16 era, but still storing entities in their own separate regionfiles. The above list is not complete. The patch documentation will complete it. New chunk system hard relies on starlight and dataconverter, and most importantly the new concurrent utilities in ConcurrentUtil. Some of the old async chunk i/o interface (i.e the old file io thread reroutes _some_ calls to the new file io thread) is kept for plugin compat reasons. It will be removed in the next major version of minecraft. The old legacy chunk system patches have been moved to the removed folder in case we need them again.
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@@ -2636,6 +2636,15 @@ public class CraftPlayer extends CraftHumanEntity implements Player {
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public void resetCooldown() {
getHandle().resetAttackStrengthTicker();
}
+
+ @Override
+ public void remove() {
+ if (this.getHandle().getClass().equals(ServerPlayer.class)) { // special case for NMS plugins inheriting
+ throw new UnsupportedOperationException("Calling Entity#remove on players produces undefined (bad) behavior");
+ } else {
+ super.remove();
+ }
+ }
// Paper end
// Spigot start
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private final Player.Spigot spigot = new Player.Spigot()