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c5a10665b8
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.
156 lines
6.8 KiB
Diff
156 lines
6.8 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Nassim Jahnke <nassim@njahnke.dev>
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Date: Thu, 29 Apr 2021 21:19:33 +0200
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Subject: [PATCH] Add Channel initialization listeners
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diff --git a/src/main/java/io/papermc/paper/network/ChannelInitializeListener.java b/src/main/java/io/papermc/paper/network/ChannelInitializeListener.java
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new file mode 100644
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index 0000000000000000000000000000000000000000..88099df34c2d74daba9645aadf65b446ca795a91
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--- /dev/null
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+++ b/src/main/java/io/papermc/paper/network/ChannelInitializeListener.java
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@@ -0,0 +1,15 @@
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+package io.papermc.paper.network;
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+
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+import io.netty.channel.Channel;
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+import org.checkerframework.checker.nullness.qual.NonNull;
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+
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+/**
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+ * Internal API to register channel initialization listeners.
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+ * <p>
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+ * This is not officially supported API and we make no guarantees to the existence or state of this interface.
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+ */
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+@FunctionalInterface
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+public interface ChannelInitializeListener {
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+
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+ void afterInitChannel(@NonNull Channel channel);
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+}
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diff --git a/src/main/java/io/papermc/paper/network/ChannelInitializeListenerHolder.java b/src/main/java/io/papermc/paper/network/ChannelInitializeListenerHolder.java
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new file mode 100644
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index 0000000000000000000000000000000000000000..30e62719e0a83525daa33cf41cb61df360c0e046
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--- /dev/null
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+++ b/src/main/java/io/papermc/paper/network/ChannelInitializeListenerHolder.java
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@@ -0,0 +1,74 @@
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+package io.papermc.paper.network;
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+
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+import io.netty.channel.Channel;
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+import net.kyori.adventure.key.Key;
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+import org.checkerframework.checker.nullness.qual.NonNull;
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+import org.checkerframework.checker.nullness.qual.Nullable;
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+
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+import java.util.Collections;
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+import java.util.HashMap;
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+import java.util.Map;
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+
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+/**
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+ * Internal API to register channel initialization listeners.
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+ * <p>
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+ * This is not officially supported API and we make no guarantees to the existence or state of this class.
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+ */
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+public final class ChannelInitializeListenerHolder {
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+
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+ private static final Map<Key, ChannelInitializeListener> LISTENERS = new HashMap<>();
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+ private static final Map<Key, ChannelInitializeListener> IMMUTABLE_VIEW = Collections.unmodifiableMap(LISTENERS);
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+
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+ private ChannelInitializeListenerHolder() {
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+ }
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+
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+ /**
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+ * Registers whether an initialization listener is registered under the given key.
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+ *
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+ * @param key key
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+ * @return whether an initialization listener is registered under the given key
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+ */
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+ public static boolean hasListener(@NonNull Key key) {
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+ return LISTENERS.containsKey(key);
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+ }
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+
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+ /**
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+ * Registers a channel initialization listener called after ServerConnection is initialized.
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+ *
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+ * @param key key
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+ * @param listener initialization listeners
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+ */
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+ public static void addListener(@NonNull Key key, @NonNull ChannelInitializeListener listener) {
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+ LISTENERS.put(key, listener);
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+ }
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+
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+ /**
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+ * Removes and returns an initialization listener registered by the given key if present.
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+ *
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+ * @param key key
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+ * @return removed initialization listener if present
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+ */
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+ public static @Nullable ChannelInitializeListener removeListener(@NonNull Key key) {
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+ return LISTENERS.remove(key);
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+ }
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+
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+ /**
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+ * Returns an immutable map of registered initialization listeners.
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+ *
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+ * @return immutable map of registered initialization listeners
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+ */
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+ public static @NonNull Map<Key, ChannelInitializeListener> getListeners() {
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+ return IMMUTABLE_VIEW;
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+ }
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+
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+ /**
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+ * Calls the registered listeners with the given channel.
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+ *
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+ * @param channel channel
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+ */
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+ public static void callListeners(@NonNull Channel channel) {
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+ for (ChannelInitializeListener listener : LISTENERS.values()) {
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+ listener.afterInitChannel(channel);
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+ }
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+ }
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+}
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diff --git a/src/main/java/io/papermc/paper/network/ConnectionEvent.java b/src/main/java/io/papermc/paper/network/ConnectionEvent.java
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new file mode 100644
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index 0000000000000000000000000000000000000000..0d7e7db9e37ef0183c32b217bd944fb4f41ab83a
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--- /dev/null
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+++ b/src/main/java/io/papermc/paper/network/ConnectionEvent.java
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@@ -0,0 +1,10 @@
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+package io.papermc.paper.network;
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+
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+/**
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+ * Internal connection pipeline events.
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+ */
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+public enum ConnectionEvent {
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+
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+ COMPRESSION_THRESHOLD_SET,
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+ COMPRESSION_DISABLED
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+}
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diff --git a/src/main/java/net/minecraft/network/Connection.java b/src/main/java/net/minecraft/network/Connection.java
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index ba41646a5edb57c4d9766df08bbc57016e2de189..2b86415e4ea197c5c44c23072c9a1cda595544a8 100644
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--- a/src/main/java/net/minecraft/network/Connection.java
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+++ b/src/main/java/net/minecraft/network/Connection.java
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@@ -680,6 +680,7 @@ public class Connection extends SimpleChannelInboundHandler<Packet<?>> {
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} else {
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this.channel.pipeline().addAfter("prepender", "compress", new CompressionEncoder(compressionThreshold));
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}
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+ this.channel.pipeline().fireUserEventTriggered(io.papermc.paper.network.ConnectionEvent.COMPRESSION_THRESHOLD_SET); // Paper - Add Channel initialization listeners
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} else {
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if (this.channel.pipeline().get("decompress") instanceof CompressionDecoder) {
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this.channel.pipeline().remove("decompress");
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@@ -688,6 +689,7 @@ public class Connection extends SimpleChannelInboundHandler<Packet<?>> {
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if (this.channel.pipeline().get("compress") instanceof CompressionEncoder) {
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this.channel.pipeline().remove("compress");
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}
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+ this.channel.pipeline().fireUserEventTriggered(io.papermc.paper.network.ConnectionEvent.COMPRESSION_DISABLED); // Paper - Add Channel initialization listeners
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}
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}
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diff --git a/src/main/java/net/minecraft/server/network/ServerConnectionListener.java b/src/main/java/net/minecraft/server/network/ServerConnectionListener.java
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index 64119f2188f8958b8a5913fec82ac5bba1b74b2a..d6d7f1c446ba5507f67038ff27775ba75156f4a7 100644
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--- a/src/main/java/net/minecraft/server/network/ServerConnectionListener.java
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+++ b/src/main/java/net/minecraft/server/network/ServerConnectionListener.java
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@@ -115,6 +115,7 @@ public class ServerConnectionListener {
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pending.add(object); // Paper - prevent blocking on adding a new connection while the server is ticking
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((Connection) object).configurePacketHandler(channelpipeline);
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((Connection) object).setListenerForServerboundHandshake(new ServerHandshakePacketListenerImpl(ServerConnectionListener.this.server, (Connection) object));
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+ io.papermc.paper.network.ChannelInitializeListenerHolder.callListeners(channel); // Paper - Add Channel initialization listeners
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}
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}).group(eventloopgroup).localAddress(address, port)).option(ChannelOption.AUTO_READ, false).bind().syncUninterruptibly()); // CraftBukkit
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}
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