Add RegionisedServerInitEvent

This event allows plugins to perform synchronous operations before
any region will tick. Plugins will not have to worry about the
possibility of a region ticking in parallel while listening
to the event.

patches/api/0004-Add-RegionisedServerInitEvent.patch

@@ -0,0 +1,42 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Spottedleaf <Spottedleaf@users.noreply.github.com>
+Date: Tue, 7 Mar 2023 12:58:48 -0800
+Subject: [PATCH] Add RegionisedServerInitEvent
+
+This event allows plugins to perform synchronous operations before
+any region will tick. Plugins will not have to worry about the
+possibility of a region ticking in parallel while listening
+to the event.
+
+diff --git a/src/main/java/io/papermc/paper/threadedregions/RegionisedServerInitEvent.java b/src/main/java/io/papermc/paper/threadedregions/RegionisedServerInitEvent.java
+new file mode 100644
+index 0000000000000000000000000000000000000000..8ffadb7c54087b79cdf7ebe11367b9d5884536e6
+--- /dev/null
++++ b/src/main/java/io/papermc/paper/threadedregions/RegionisedServerInitEvent.java
+@@ -0,0 +1,26 @@
++package io.papermc.paper.threadedregions;
++
++import org.bukkit.event.HandlerList;
++import org.bukkit.event.server.ServerEvent;
++import org.jetbrains.annotations.NotNull;
++
++/**
++ * This event is called after the server is initialised but <b>before</b> the server begins ticking regions in parallel.
++ * Plugins may use this as a hook to run post initialisation logic without worrying about the possibility that
++ * regions are ticking in parallel.
++ */
++public class RegionisedServerInitEvent extends ServerEvent {
++
++    private static final HandlerList handlers = new HandlerList();
++
++    @NotNull
++    @Override
++    public HandlerList getHandlers() {
++        return handlers;
++    }
++
++    @NotNull
++    public static HandlerList getHandlerList() {
++        return handlers;
++    }
++}

patches/server/0004-Threaded-Regions.patch

@@ -4193,10 +4193,10 @@ index 0000000000000000000000000000000000000000..3549e5f3359f38b207e189d895954420
 +}
 diff --git a/src/main/java/io/papermc/paper/threadedregions/RegionisedServer.java b/src/main/java/io/papermc/paper/threadedregions/RegionisedServer.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..269c051e20cd07e692c624a873e4ee2b5ae5589a
+index 0000000000000000000000000000000000000000..99c258c113cd4257e54f795e09d6d8f3aa2f4e33
 --- /dev/null
 +++ b/src/main/java/io/papermc/paper/threadedregions/RegionisedServer.java
-@@ -0,0 +1,366 @@
+@@ -0,0 +1,370 @@
 +package io.papermc.paper.threadedregions;
 +
 +import ca.spottedleaf.concurrentutil.collection.MultiThreadedQueue;
@@ -4263,6 +4263,10 @@ index 0000000000000000000000000000000000000000..269c051e20cd07e692c624a873e4ee2b
 +    }
 +
 +    public void init() {
++        // call init event _before_ scheduling anything
++        new RegionisedServerInitEvent().callEvent();
++
++        // now we can schedule
 +        this.tickHandle.setInitialStart(System.nanoTime() + TickRegionScheduler.TIME_BETWEEN_TICKS);
 +        TickRegions.getScheduler().scheduleRegion(this.tickHandle);
 +        TickRegions.getScheduler().init();