71c18fd5c9
This simply provides the base API to create the objects. Further commits will come that adds adds usage of this API to existing GameProfile based API's, as well as new API's.
123 lines
4.1 KiB
Diff
123 lines
4.1 KiB
Diff
From a7b0ffbf5d18452aef72e50c0c588d945024aada Mon Sep 17 00:00:00 2001
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From: Aikar <aikar@aikar.co>
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Date: Sun, 14 Jan 2018 16:59:43 -0500
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Subject: [PATCH] PreCreatureSpawnEvent
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Adds an event to fire before an Entity is created, so that plugins that need to cancel
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CreatureSpawnEvent can do so from this event instead.
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Cancelling CreatureSpawnEvent rapidly causes a lot of garbage collection and CPU waste
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as it's done after the Entity object has been fully created.
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Mob Limiting plugins and blanket "ban this type of monster" plugins should use this event
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instead and save a lot of server resources.
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See: https://github.com/PaperMC/Paper/issues/917
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diff --git a/src/main/java/com/destroystokyo/paper/event/entity/PreCreatureSpawnEvent.java b/src/main/java/com/destroystokyo/paper/event/entity/PreCreatureSpawnEvent.java
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new file mode 100644
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index 00000000..c4751b61
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--- /dev/null
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+++ b/src/main/java/com/destroystokyo/paper/event/entity/PreCreatureSpawnEvent.java
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@@ -0,0 +1,97 @@
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+package com.destroystokyo.paper.event.entity;
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+
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+import com.google.common.base.Preconditions;
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+import org.bukkit.Location;
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+import org.bukkit.entity.EntityType;
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+import org.bukkit.event.Cancellable;
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+import org.bukkit.event.Event;
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+import org.bukkit.event.HandlerList;
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+import org.bukkit.event.entity.CreatureSpawnEvent;
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+
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+/**
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+ * WARNING: This event only fires for a limited number of cases, and not for every case that CreatureSpawnEvent does.
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+ *
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+ * You should still listen to CreatureSpawnEvent as a backup, and only use this event as an "enhancement".
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+ * The intent of this event is to improve server performance, so limited use cases.
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+ *
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+ * Currently: NATURAL and SPAWNER based reasons. Please submit a Pull Request for future additions.
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+ */
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+public class PreCreatureSpawnEvent extends Event implements Cancellable {
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+ private final Location location;
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+ private final EntityType type;
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+ private final CreatureSpawnEvent.SpawnReason reason;
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+ private boolean shouldAbortSpawn;
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+
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+ public PreCreatureSpawnEvent(Location location, EntityType type, CreatureSpawnEvent.SpawnReason reason) {
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+ this.location = Preconditions.checkNotNull(location, "Location may not be null").clone();
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+ this.type = Preconditions.checkNotNull(type, "Type may not be null");
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+ this.reason = Preconditions.checkNotNull(reason, "Reason may not be null");
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+ }
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+
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+ /**
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+ * @return The location this creature is being spawned at
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+ */
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+ public Location getSpawnLocation() {
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+ return location;
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+ }
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+
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+ /**
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+ * @return The type of creature being spawned
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+ */
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+ public EntityType getType() {
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+ return type;
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+ }
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+
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+ /**
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+ * @return Reason this creature is spawning (ie, NATURAL vs SPAWNER)
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+ */
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+ public CreatureSpawnEvent.SpawnReason getReason() {
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+ return reason;
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+ }
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+
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+ /**
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+ * @return If the spawn process should be aborted vs trying more attempts
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+ */
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+ public boolean shouldAbortSpawn() {
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+ return shouldAbortSpawn;
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+ }
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+
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+ /**
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+ * Set this if you are more blanket blocking all types of these spawns, and wish to abort the spawn process from
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+ * trying more attempts after this cancellation.
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+ *
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+ * @param shouldAbortSpawn Set if the spawn process should be aborted vs trying more attempts
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+ */
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+ public void setShouldAbortSpawn(boolean shouldAbortSpawn) {
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+ this.shouldAbortSpawn = shouldAbortSpawn;
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+ }
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+
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+ private static final HandlerList handlers = new HandlerList();
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+
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+ public HandlerList getHandlers() {
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+ return handlers;
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+ }
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+
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+ public static HandlerList getHandlerList() {
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+ return handlers;
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+ }
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+
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+ private boolean cancelled = false;
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+
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+ /**
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+ * @return If the spawn of this creature is cancelled or not
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+ */
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+ @Override
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+ public boolean isCancelled() {
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+ return cancelled;
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+ }
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+
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+ /**
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+ * Cancelling this event is more effecient than cancelling CreatureSpawnEvent
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+ * @param cancel true if you wish to cancel this event, and abort the spawn of this creature
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+ */
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+ @Override
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+ public void setCancelled(boolean cancel) {
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+ cancelled = cancel;
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+ }
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+}
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--
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2.15.1
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