Remove wall-time / unused skip tick protection (#11412)
Spigot still maintains some partial implementation of "tick skipping", a practice in which the MinecraftServer.currentTick field is updated not by an increment of one per actual tick, but instead set to System.currentTimeMillis() / 50. This behaviour means that the tracked tick may "skip" a tick value in case a previous tick took more than the expected 50ms. To compensate for this in important paths, spigot/craftbukkit implements "wall-time". Instead of incrementing/decrementing ticks on block entities/entities by one for each call to their tick() method, they instead increment/decrement important values, like an ItemEntity's age or pickupDelay, by the difference of `currentTick - lastTick`, where `lastTick` is the value of `currentTick` during the last tick() call. These "fixes" however do not play nicely with minecraft's simulation distance as entities/block entities implementing the above behaviour would "catch up" their values when moving from a non-ticking chunk to a ticking one as their `lastTick` value remains stuck on the last tick in a ticking chunk and hence lead to a large "catch up" once ticked again. Paper completely removes the "tick skipping" behaviour (See patch "Further-improve-server-tick-loop"), making the above precautions completely unnecessary, which also rids paper of the previous described incompatibility with non-ticking chunks.
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794 changed files with 402 additions and 282 deletions
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patches/server/0639-Add-API-for-item-entity-health.patch
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patches/server/0639-Add-API-for-item-entity-health.patch
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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Jake Potrebic <jake.m.potrebic@gmail.com>
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Date: Sat, 28 Aug 2021 09:00:45 -0700
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Subject: [PATCH] Add API for item entity health
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== AT ==
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public net.minecraft.world.entity.item.ItemEntity health
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diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftItem.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftItem.java
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index 4a15c3786edbfeae3367c0b20fb6aee11d62aea6..1a291dd8a287db30e71dcb315599fc4b038764c4 100644
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--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftItem.java
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+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftItem.java
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@@ -98,6 +98,21 @@ public class CraftItem extends CraftEntity implements Item {
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public void setWillAge(boolean willAge) {
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this.getHandle().age = willAge ? 0 : NO_AGE_TIME;
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}
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+
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+ @Override
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+ public int getHealth() {
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+ return this.getHandle().health;
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+ }
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+
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+ @Override
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+ public void setHealth(int health) {
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+ if (health <= 0) {
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+ this.getHandle().getItem().onDestroyed(this.getHandle());
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+ this.getHandle().discard(org.bukkit.event.entity.EntityRemoveEvent.Cause.PLUGIN);
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+ } else {
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+ this.getHandle().health = health;
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+ }
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+ }
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// Paper end
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@Override
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