Lifecycle Event System (#9629)

* registering stuff event system

* simply by removing a ton of unneeded generics

* separate RegistryEvent and RegistrarEvent

* add logic for removing hooks when a plugin is disabled

* cleanup more

* swap around the way things are registered

* block further hook registrations for JavaPlugin

* Slightly more extensible to support registry mod API

* rename some types

* more moving/renaming

* remove 'hook' name

* Rename to 'lifecycle'

* move more impls for the server

* add priorities

* added lock for bootstrap event registration

* slight refactor to allow 'register anywhere' event types

* Move event type list to server impl

* use builder pattern to create event handler configurations

* add some more javadocs

* fix some issues, slight refactors

* call predicate and method renames

* add owner aware events

* rebased and refactored owner aware events

* add single helper method for registering simple handler

* compile fixes

* check owner and fix generics on register helper

* javadoc fixes and a few type renames

* more javadoc fixes

* move service loader file to correct location

* rename to Monitorable and Prioritizable

* add invalidation system for events after running them

* block reloading plugins in certain situations

* update test plugin

* remove dummy events

* rebase

patches/api/0459-Add-Lifecycle-Event-system.patch

@@ -0,0 +1,628 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Jake Potrebic <jake.m.potrebic@gmail.com>
+Date: Tue, 18 Jul 2023 14:47:02 -0700
+Subject: [PATCH] Add Lifecycle Event system
+
+This event system is separate from Bukkit's event system and is
+meant for managing resources across reloads and from points in the
+PluginBootstrap.
+
+diff --git a/src/main/java/io/papermc/paper/plugin/bootstrap/BootstrapContext.java b/src/main/java/io/papermc/paper/plugin/bootstrap/BootstrapContext.java
+index 08f2050356acaf74e3210416760e3873c2dafd2c..37dfdcfcbd14947e0550e7528aca68f452e53eb6 100644
+--- a/src/main/java/io/papermc/paper/plugin/bootstrap/BootstrapContext.java
++++ b/src/main/java/io/papermc/paper/plugin/bootstrap/BootstrapContext.java
+@@ -1,6 +1,9 @@
+ package io.papermc.paper.plugin.bootstrap;
+ 
++import io.papermc.paper.plugin.lifecycle.event.LifecycleEventManager;
++import io.papermc.paper.plugin.lifecycle.event.LifecycleEventOwner;
+ import org.jetbrains.annotations.ApiStatus;
++import org.jetbrains.annotations.NotNull;
+ 
+ /**
+  * Represents the context provided to a {@link PluginBootstrap} during both the bootstrapping and plugin
+@@ -10,5 +13,13 @@ import org.jetbrains.annotations.ApiStatus;
+  */
+ @ApiStatus.Experimental
+ @ApiStatus.NonExtendable
+-public interface BootstrapContext extends PluginProviderContext {
++public interface BootstrapContext extends PluginProviderContext, LifecycleEventOwner {
++
++    /**
++     * Get the lifecycle event manager for registering handlers
++     * for lifecycle events allowed on the {@link BootstrapContext}.
++     *
++     * @return the lifecycle event manager
++     */
++    @NotNull LifecycleEventManager<BootstrapContext> getLifecycleManager();
+ }
+diff --git a/src/main/java/io/papermc/paper/plugin/lifecycle/event/LifecycleEvent.java b/src/main/java/io/papermc/paper/plugin/lifecycle/event/LifecycleEvent.java
+new file mode 100644
+index 0000000000000000000000000000000000000000..0b8eafd3e79494d4a750cd9182387fbaead24011
+--- /dev/null
++++ b/src/main/java/io/papermc/paper/plugin/lifecycle/event/LifecycleEvent.java
+@@ -0,0 +1,17 @@
++package io.papermc.paper.plugin.lifecycle.event;
++
++import io.papermc.paper.plugin.lifecycle.event.types.LifecycleEvents;
++import org.jetbrains.annotations.ApiStatus;
++
++/**
++ * Base type for all Lifecycle Events.
++ * <p>
++ * Lifecycle events are generally fired when the older
++ * event system is not available, like during early
++ * server initialization.
++ * @see LifecycleEvents
++ */
++@ApiStatus.Experimental
++@ApiStatus.NonExtendable
++public interface LifecycleEvent {
++}
+diff --git a/src/main/java/io/papermc/paper/plugin/lifecycle/event/LifecycleEventManager.java b/src/main/java/io/papermc/paper/plugin/lifecycle/event/LifecycleEventManager.java
+new file mode 100644
+index 0000000000000000000000000000000000000000..3626ce3da17f20ec44f0c15baa13f40e1dc2bc9c
+--- /dev/null
++++ b/src/main/java/io/papermc/paper/plugin/lifecycle/event/LifecycleEventManager.java
+@@ -0,0 +1,52 @@
++package io.papermc.paper.plugin.lifecycle.event;
++
++import io.papermc.paper.plugin.lifecycle.event.handler.LifecycleEventHandler;
++import io.papermc.paper.plugin.lifecycle.event.handler.configuration.LifecycleEventHandlerConfiguration;
++import io.papermc.paper.plugin.lifecycle.event.types.LifecycleEventType;
++import org.jetbrains.annotations.ApiStatus;
++import org.jetbrains.annotations.NotNull;
++
++/**
++ * Manages a plugin's lifecycle events. Can be obtained
++ * from {@link org.bukkit.plugin.Plugin} or {@link io.papermc.paper.plugin.bootstrap.BootstrapContext}.
++ *
++ * @param <O> the owning type, {@link org.bukkit.plugin.Plugin} or {@link io.papermc.paper.plugin.bootstrap.BootstrapContext}
++ */
++@ApiStatus.Experimental
++@ApiStatus.NonExtendable
++public interface LifecycleEventManager<O extends LifecycleEventOwner> {
++
++    /**
++     * Registers an event handler for a specific event type.
++     * <p>
++     * This is shorthand for creating a new {@link LifecycleEventHandlerConfiguration} and
++     * just passing in the {@link LifecycleEventHandler}.
++     * <pre>{@code
++     * LifecycleEventHandler<RegistrarEvent<Commands>> handler = new Handler();
++     * manager.registerEventHandler(LifecycleEvents.COMMANDS, handler);
++     * }</pre>
++     * is equivalent to
++     * <pre>{@code
++     * LifecycleEventHandler<RegistrarEvent<Commands>> handler = new Handler();
++     * manager.registerEventHandler(LifecycleEvents.COMMANDS.newHandler(handler));
++     * }</pre>
++     *
++     * @param eventType the event type to listen to
++     * @param eventHandler the handler for that event
++     * @param <E> the type of the event object
++     */
++    default <E extends LifecycleEvent> void registerEventHandler(final @NotNull LifecycleEventType<? super O, ? extends E, ?> eventType, final @NotNull LifecycleEventHandler<? super E> eventHandler) {
++        this.registerEventHandler(eventType.newHandler(eventHandler));
++    }
++
++    /**
++     * Registers an event handler configuration.
++     * <p>
++     * Configurations are created via {@link LifecycleEventType#newHandler(LifecycleEventHandler)}.
++     * Event types may have different configurations options available on the builder-like object
++     * returned by {@link LifecycleEventType#newHandler(LifecycleEventHandler)}.
++     *
++     * @param handlerConfiguration the handler configuration to register
++     */
++    void registerEventHandler(@NotNull LifecycleEventHandlerConfiguration<? super O> handlerConfiguration);
++}
+diff --git a/src/main/java/io/papermc/paper/plugin/lifecycle/event/LifecycleEventOwner.java b/src/main/java/io/papermc/paper/plugin/lifecycle/event/LifecycleEventOwner.java
+new file mode 100644
+index 0000000000000000000000000000000000000000..1160474f94476b580426cec29756c4699e163bf7
+--- /dev/null
++++ b/src/main/java/io/papermc/paper/plugin/lifecycle/event/LifecycleEventOwner.java
+@@ -0,0 +1,24 @@
++package io.papermc.paper.plugin.lifecycle.event;
++
++import io.papermc.paper.plugin.configuration.PluginMeta;
++import org.jetbrains.annotations.ApiStatus;
++import org.jetbrains.annotations.NotNull;
++
++/**
++ * Implemented by types that are considered owners
++ * of registered handlers for lifecycle events. Generally
++ * the types that implement this interface also provide
++ * a {@link LifecycleEventManager} where you can register
++ * event handlers.
++ */
++@ApiStatus.Experimental
++@ApiStatus.NonExtendable
++public interface LifecycleEventOwner {
++
++    /**
++     * Get the plugin meta for this plugin.
++     *
++     * @return the plugin meta
++     */
++    @NotNull PluginMeta getPluginMeta();
++}
+diff --git a/src/main/java/io/papermc/paper/plugin/lifecycle/event/handler/LifecycleEventHandler.java b/src/main/java/io/papermc/paper/plugin/lifecycle/event/handler/LifecycleEventHandler.java
+new file mode 100644
+index 0000000000000000000000000000000000000000..8239ba3c0147c0e8e8d28987d3f543a67641892a
+--- /dev/null
++++ b/src/main/java/io/papermc/paper/plugin/lifecycle/event/handler/LifecycleEventHandler.java
+@@ -0,0 +1,18 @@
++package io.papermc.paper.plugin.lifecycle.event.handler;
++
++import io.papermc.paper.plugin.lifecycle.event.LifecycleEvent;
++import org.jetbrains.annotations.ApiStatus;
++import org.jetbrains.annotations.NotNull;
++
++/**
++ * A handler for a specific event. Can be implemented
++ * in a concrete class or as a lambda.
++ *
++ * @param <E> the event
++ */
++@ApiStatus.Experimental
++@FunctionalInterface
++public interface LifecycleEventHandler<E extends LifecycleEvent> {
++
++    void run(@NotNull E event);
++}
+diff --git a/src/main/java/io/papermc/paper/plugin/lifecycle/event/handler/configuration/LifecycleEventHandlerConfiguration.java b/src/main/java/io/papermc/paper/plugin/lifecycle/event/handler/configuration/LifecycleEventHandlerConfiguration.java
+new file mode 100644
+index 0000000000000000000000000000000000000000..0831794fad1f6eb8960225909d40f4a3b20a2a3b
+--- /dev/null
++++ b/src/main/java/io/papermc/paper/plugin/lifecycle/event/handler/configuration/LifecycleEventHandlerConfiguration.java
+@@ -0,0 +1,18 @@
++package io.papermc.paper.plugin.lifecycle.event.handler.configuration;
++
++import io.papermc.paper.plugin.lifecycle.event.LifecycleEventOwner;
++import io.papermc.paper.plugin.lifecycle.event.handler.LifecycleEventHandler;
++import org.jetbrains.annotations.ApiStatus;
++
++/**
++ * Base type for constructing configured event handlers for
++ * lifecycle events. Usually created via {@link io.papermc.paper.plugin.lifecycle.event.types.LifecycleEventType#newHandler(LifecycleEventHandler)}
++ * from event types in {@link io.papermc.paper.plugin.lifecycle.event.types.LifecycleEvents}
++ *
++ * @param <O>
++ */
++@SuppressWarnings("unused")
++@ApiStatus.Experimental
++@ApiStatus.NonExtendable
++public interface LifecycleEventHandlerConfiguration<O extends LifecycleEventOwner> {
++}
+diff --git a/src/main/java/io/papermc/paper/plugin/lifecycle/event/handler/configuration/MonitorLifecycleEventHandlerConfiguration.java b/src/main/java/io/papermc/paper/plugin/lifecycle/event/handler/configuration/MonitorLifecycleEventHandlerConfiguration.java
+new file mode 100644
+index 0000000000000000000000000000000000000000..d307ede51a66279f2eeef4e5b41c71779503f0d4
+--- /dev/null
++++ b/src/main/java/io/papermc/paper/plugin/lifecycle/event/handler/configuration/MonitorLifecycleEventHandlerConfiguration.java
+@@ -0,0 +1,25 @@
++package io.papermc.paper.plugin.lifecycle.event.handler.configuration;
++
++import io.papermc.paper.plugin.lifecycle.event.LifecycleEventOwner;
++import org.jetbrains.annotations.ApiStatus;
++import org.jetbrains.annotations.Contract;
++
++/**
++ * Handler configuration for event types that allow "monitor" handlers.
++ *
++ * @param <O> the required owner type
++ */
++@ApiStatus.Experimental
++@ApiStatus.NonExtendable
++public interface MonitorLifecycleEventHandlerConfiguration<O extends LifecycleEventOwner> extends LifecycleEventHandlerConfiguration<O> {
++
++    /**
++     * Sets this handler configuration to be considered a "monitor".
++     * These handlers will run last and should only be used by plugins
++     * to observe changes from previously run handlers.
++     *
++     * @return this configuration for chaining
++     */
++    @Contract("-> this")
++    MonitorLifecycleEventHandlerConfiguration<O> monitor();
++}
+diff --git a/src/main/java/io/papermc/paper/plugin/lifecycle/event/handler/configuration/PrioritizedLifecycleEventHandlerConfiguration.java b/src/main/java/io/papermc/paper/plugin/lifecycle/event/handler/configuration/PrioritizedLifecycleEventHandlerConfiguration.java
+new file mode 100644
+index 0000000000000000000000000000000000000000..1c404df0be359ceac7fb52fec03027c771395e07
+--- /dev/null
++++ b/src/main/java/io/papermc/paper/plugin/lifecycle/event/handler/configuration/PrioritizedLifecycleEventHandlerConfiguration.java
+@@ -0,0 +1,39 @@
++package io.papermc.paper.plugin.lifecycle.event.handler.configuration;
++
++import io.papermc.paper.plugin.lifecycle.event.LifecycleEventOwner;
++import org.jetbrains.annotations.ApiStatus;
++import org.jetbrains.annotations.Contract;
++
++/**
++ * Handler configuration that allows both "monitor" and prioritized handlers.
++ * The default priority is 0.
++ *
++ * @param <O> the required owner type
++ */
++@ApiStatus.Experimental
++@ApiStatus.NonExtendable
++public interface PrioritizedLifecycleEventHandlerConfiguration<O extends LifecycleEventOwner> extends LifecycleEventHandlerConfiguration<O> {
++
++    /**
++     * Sets the priority for this handler. Resets
++     * all previous calls to {@link #monitor()}. A
++     * lower numeric value correlates to the handler
++     * being run earlier.
++     *
++     * @param priority the numerical priority
++     * @return this configuration for chaining
++     */
++    @Contract("_ -> this")
++    PrioritizedLifecycleEventHandlerConfiguration<O> priority(int priority);
++
++    /**
++     * Sets this handler configuration to be considered a "monitor".
++     * These handlers will run last and should only be used by plugins
++     * to observe any changes from previously ran handlers.
++     *
++     * @return this configuration for chaining
++     */
++    @Contract("-> this")
++    PrioritizedLifecycleEventHandlerConfiguration<O> monitor();
++
++}
+diff --git a/src/main/java/io/papermc/paper/plugin/lifecycle/event/registrar/Registrar.java b/src/main/java/io/papermc/paper/plugin/lifecycle/event/registrar/Registrar.java
+new file mode 100644
+index 0000000000000000000000000000000000000000..fd9c3605a8f5e6bdd31e42f18a45154d4074eb67
+--- /dev/null
++++ b/src/main/java/io/papermc/paper/plugin/lifecycle/event/registrar/Registrar.java
+@@ -0,0 +1,12 @@
++package io.papermc.paper.plugin.lifecycle.event.registrar;
++
++import org.jetbrains.annotations.ApiStatus;
++
++/**
++ * To be implemented by types that provide ways to register types
++ * either on server start or during a reload
++ */
++@ApiStatus.Experimental
++@ApiStatus.NonExtendable
++public interface Registrar {
++}
+diff --git a/src/main/java/io/papermc/paper/plugin/lifecycle/event/registrar/RegistrarEvent.java b/src/main/java/io/papermc/paper/plugin/lifecycle/event/registrar/RegistrarEvent.java
+new file mode 100644
+index 0000000000000000000000000000000000000000..2e5758d1af6215f33f89b12984a5594df592147f
+--- /dev/null
++++ b/src/main/java/io/papermc/paper/plugin/lifecycle/event/registrar/RegistrarEvent.java
+@@ -0,0 +1,27 @@
++package io.papermc.paper.plugin.lifecycle.event.registrar;
++
++import io.papermc.paper.plugin.lifecycle.event.LifecycleEvent;
++import org.jetbrains.annotations.ApiStatus;
++import org.jetbrains.annotations.Contract;
++import org.jetbrains.annotations.NotNull;
++
++/**
++ * A lifecycle event that exposes a {@link Registrar} of some kind
++ * to allow management of various things. Look at implementations of
++ * {@link Registrar} for an idea of what uses this event.
++ *
++ * @param <R> registrar type
++ * @see ReloadableRegistrarEvent
++ */
++@ApiStatus.Experimental
++@ApiStatus.NonExtendable
++public interface RegistrarEvent<R extends Registrar> extends LifecycleEvent {
++
++    /**
++     * Get the registrar related to this event.
++     *
++     * @return the registrar
++     */
++    @Contract(pure = true)
++    @NotNull R registrar();
++}
+diff --git a/src/main/java/io/papermc/paper/plugin/lifecycle/event/registrar/ReloadableRegistrarEvent.java b/src/main/java/io/papermc/paper/plugin/lifecycle/event/registrar/ReloadableRegistrarEvent.java
+new file mode 100644
+index 0000000000000000000000000000000000000000..b8b439bdad2e47c7c715fe30e0c1e69aa25374dd
+--- /dev/null
++++ b/src/main/java/io/papermc/paper/plugin/lifecycle/event/registrar/ReloadableRegistrarEvent.java
+@@ -0,0 +1,38 @@
++package io.papermc.paper.plugin.lifecycle.event.registrar;
++
++import org.jetbrains.annotations.ApiStatus;
++import org.jetbrains.annotations.Contract;
++import org.jetbrains.annotations.NotNull;
++
++/**
++ * A lifecycle event that exposes a {@link Registrar} that is
++ * reloadable.
++ *
++ * @param <R> the registrar type
++ * @see RegistrarEvent
++ */
++@ApiStatus.Experimental
++@ApiStatus.NonExtendable
++public interface ReloadableRegistrarEvent<R extends Registrar> extends RegistrarEvent<R> {
++
++    /**
++     * Get the cause of this reload.
++     *
++     * @return the cause
++     */
++    @Contract(pure = true)
++    @NotNull Cause cause();
++
++    @ApiStatus.Experimental
++    enum Cause {
++        /**
++         * The initial load of the server.
++         */
++        INITIAL,
++        /**
++         * A reload, triggered via one of the various mechanisms like
++         * the bukkit or minecraft reload commands.
++         */
++        RELOAD
++    }
++}
+diff --git a/src/main/java/io/papermc/paper/plugin/lifecycle/event/types/LifecycleEventType.java b/src/main/java/io/papermc/paper/plugin/lifecycle/event/types/LifecycleEventType.java
+new file mode 100644
+index 0000000000000000000000000000000000000000..92ea0374079a228ccc59c00fcf58abff2f6c46fe
+--- /dev/null
++++ b/src/main/java/io/papermc/paper/plugin/lifecycle/event/types/LifecycleEventType.java
+@@ -0,0 +1,73 @@
++package io.papermc.paper.plugin.lifecycle.event.types;
++
++import io.papermc.paper.plugin.lifecycle.event.LifecycleEvent;
++import io.papermc.paper.plugin.lifecycle.event.LifecycleEventManager;
++import io.papermc.paper.plugin.lifecycle.event.LifecycleEventOwner;
++import io.papermc.paper.plugin.lifecycle.event.handler.LifecycleEventHandler;
++import io.papermc.paper.plugin.lifecycle.event.handler.configuration.LifecycleEventHandlerConfiguration;
++import io.papermc.paper.plugin.lifecycle.event.handler.configuration.MonitorLifecycleEventHandlerConfiguration;
++import io.papermc.paper.plugin.lifecycle.event.handler.configuration.PrioritizedLifecycleEventHandlerConfiguration;
++import org.jetbrains.annotations.ApiStatus;
++import org.jetbrains.annotations.Contract;
++import org.jetbrains.annotations.NotNull;
++
++/**
++ * Base type for all types of lifecycle events. Differs from
++ * {@link LifecycleEvent} which is the actual event object, whereas
++ * this is an object representing the type of the event. Used
++ * to construct subtypes of {@link LifecycleEventHandlerConfiguration} for
++ * use in {@link LifecycleEventManager}
++ *
++ * @param <O> the required owner type
++ * @param <E> the event object type
++ * @param <C> the configuration type
++ */
++@ApiStatus.Experimental
++@ApiStatus.NonExtendable
++public interface LifecycleEventType<O extends LifecycleEventOwner, E extends LifecycleEvent, C extends LifecycleEventHandlerConfiguration<O>> {
++
++    /**
++     * Gets the name of the lifecycle event.
++     *
++     * @return the name
++     */
++    @Contract(pure = true)
++    @NotNull String name();
++
++    /**
++     * Create a configuration for this event with the specified
++     * handler.
++     *
++     * @param handler the event handler
++     * @return a new configuration
++     * @see LifecycleEventManager#registerEventHandler(LifecycleEventHandlerConfiguration)
++     */
++    @Contract("_ -> new")
++    @NotNull C newHandler(@NotNull LifecycleEventHandler<? super E> handler);
++
++    /**
++     * Lifecycle event type that supports separate registration
++     * of handlers as "monitors" that are run last. Useful
++     * if a plugin wants to only observe the changes other handlers
++     * made.
++     *
++     * @param <O> the required owner type
++     * @param <E> the event object type
++     */
++    @ApiStatus.Experimental
++    @ApiStatus.NonExtendable
++    interface Monitorable<O extends LifecycleEventOwner, E extends LifecycleEvent> extends LifecycleEventType<O, E, MonitorLifecycleEventHandlerConfiguration<O>> {
++    }
++
++    /**
++     * Lifecycle event type that supports both {@link Monitorable "monitors"} and
++     * specific numeric-based priorities.
++     *
++     * @param <O> the required owner type
++     * @param <E> the event object type
++     */
++    @ApiStatus.Experimental
++    @ApiStatus.NonExtendable
++    interface Prioritizable<O extends LifecycleEventOwner, E extends LifecycleEvent> extends LifecycleEventType<O, E, PrioritizedLifecycleEventHandlerConfiguration<O>> {
++    }
++}
+diff --git a/src/main/java/io/papermc/paper/plugin/lifecycle/event/types/LifecycleEventTypeProvider.java b/src/main/java/io/papermc/paper/plugin/lifecycle/event/types/LifecycleEventTypeProvider.java
+new file mode 100644
+index 0000000000000000000000000000000000000000..1588f6943a909bed053a952e650e043c44028c2d
+--- /dev/null
++++ b/src/main/java/io/papermc/paper/plugin/lifecycle/event/types/LifecycleEventTypeProvider.java
+@@ -0,0 +1,18 @@
++package io.papermc.paper.plugin.lifecycle.event.types;
++
++import io.papermc.paper.plugin.lifecycle.event.LifecycleEvent;
++import io.papermc.paper.plugin.lifecycle.event.LifecycleEventOwner;
++import java.util.ServiceLoader;
++import org.jetbrains.annotations.ApiStatus;
++
++@ApiStatus.Internal
++interface LifecycleEventTypeProvider {
++
++    LifecycleEventTypeProvider PROVIDER = ServiceLoader.load(LifecycleEventTypeProvider.class)
++        .findFirst()
++        .orElseThrow();
++
++    <O extends LifecycleEventOwner, E extends LifecycleEvent> LifecycleEventType.Monitorable<O, E> monitor(String name, Class<? extends O> ownerType);
++
++    <O extends LifecycleEventOwner, E extends LifecycleEvent> LifecycleEventType.Prioritizable<O, E> prioritized(String name, Class<? extends O> ownerType);
++}
+diff --git a/src/main/java/io/papermc/paper/plugin/lifecycle/event/types/LifecycleEvents.java b/src/main/java/io/papermc/paper/plugin/lifecycle/event/types/LifecycleEvents.java
+new file mode 100644
+index 0000000000000000000000000000000000000000..304f978e40e1759bb19704cc5cec399500905195
+--- /dev/null
++++ b/src/main/java/io/papermc/paper/plugin/lifecycle/event/types/LifecycleEvents.java
+@@ -0,0 +1,52 @@
++package io.papermc.paper.plugin.lifecycle.event.types;
++
++import io.papermc.paper.plugin.bootstrap.BootstrapContext;
++import io.papermc.paper.plugin.lifecycle.event.LifecycleEvent;
++import io.papermc.paper.plugin.lifecycle.event.LifecycleEventManager;
++import io.papermc.paper.plugin.lifecycle.event.LifecycleEventOwner;
++import org.bukkit.plugin.Plugin;
++import org.jetbrains.annotations.ApiStatus;
++
++/**
++ * Holds various types of lifecycle events for
++ * use when creating event handler configurations
++ * in {@link LifecycleEventManager}.
++ */
++@ApiStatus.Experimental
++public final class LifecycleEvents {
++
++    //<editor-fold desc="helper methods" defaultstate="collapsed">
++    @ApiStatus.Internal
++    private static <E extends LifecycleEvent> LifecycleEventType.Monitorable<Plugin, E> plugin(final String name) {
++        return monitor(name, Plugin.class);
++    }
++
++    @ApiStatus.Internal
++    private static <E extends LifecycleEvent> LifecycleEventType.Prioritizable<Plugin, E> pluginPrioritized(final String name) {
++        return prioritized(name, Plugin.class);
++    }
++
++    @ApiStatus.Internal
++    private static <E extends LifecycleEvent> LifecycleEventType.Monitorable<BootstrapContext, E> bootstrap(final String name) {
++        return monitor(name, BootstrapContext.class);
++    }
++
++    @ApiStatus.Internal
++    private static <E extends LifecycleEvent> LifecycleEventType.Prioritizable<BootstrapContext, E> bootstrapPrioritized(final String name) {
++        return prioritized(name, BootstrapContext.class);
++    }
++
++    @ApiStatus.Internal
++    private static <O extends LifecycleEventOwner, E extends LifecycleEvent, O2 extends O> LifecycleEventType.Monitorable<O, E> monitor(final String name, final Class<O2> ownerType) {
++        return LifecycleEventTypeProvider.PROVIDER.monitor(name, ownerType);
++    }
++
++    @ApiStatus.Internal
++    private static <O extends LifecycleEventOwner, E extends LifecycleEvent> LifecycleEventType.Prioritizable<O, E> prioritized(final String name, final Class<? extends O> ownerType) {
++        return LifecycleEventTypeProvider.PROVIDER.prioritized(name, ownerType);
++    }
++    //</editor-fold>
++
++    private LifecycleEvents() {
++    }
++}
+diff --git a/src/main/java/org/bukkit/UnsafeValues.java b/src/main/java/org/bukkit/UnsafeValues.java
+index 923d8655a84e26960d35d8dc6e4ebc0b10c295d5..890c07cfc2e64a52752e96d518578b5eb1afbd19 100644
+--- a/src/main/java/org/bukkit/UnsafeValues.java
++++ b/src/main/java/org/bukkit/UnsafeValues.java
+@@ -273,4 +273,12 @@ public interface UnsafeValues {
+      */
+     @Nullable org.bukkit.Color getSpawnEggLayerColor(org.bukkit.entity.EntityType entityType, int layer);
+     // Paper end - spawn egg color visibility
++
++    // Paper start - lifecycle event API
++    /**
++     * @hidden
++     */
++    @org.jetbrains.annotations.ApiStatus.Internal
++    io.papermc.paper.plugin.lifecycle.event.LifecycleEventManager<org.bukkit.plugin.Plugin> createPluginLifecycleEventManager(final org.bukkit.plugin.java.JavaPlugin plugin, final java.util.function.BooleanSupplier registrationCheck);
++    // Paper end - lifecycle event API
+ }
+diff --git a/src/main/java/org/bukkit/plugin/Plugin.java b/src/main/java/org/bukkit/plugin/Plugin.java
+index 4eb639fbb46a0848be207149ea433455550fae1c..ef431219fd2bce48bad63b6b92c99d54348d480e 100644
+--- a/src/main/java/org/bukkit/plugin/Plugin.java
++++ b/src/main/java/org/bukkit/plugin/Plugin.java
+@@ -16,7 +16,7 @@ import org.jetbrains.annotations.Nullable;
+  * <p>
+  * The use of {@link PluginBase} is recommended for actual Implementation
+  */
+-public interface Plugin extends TabExecutor {
++public interface Plugin extends TabExecutor, io.papermc.paper.plugin.lifecycle.event.LifecycleEventOwner { // Paper
+     /**
+      * Returns the folder that the plugin data's files are located in. The
+      * folder may not yet exist.
+@@ -224,4 +224,14 @@ public interface Plugin extends TabExecutor {
+      */
+     @NotNull
+     public String getName();
++
++    // Paper start - lifecycle events
++    /**
++     * Get the lifecycle event manager for registering handlers
++     * for lifecycle events allowed on the {@link Plugin}.
++     *
++     * @return the lifecycle event manager
++     */
++    io.papermc.paper.plugin.lifecycle.event.@NotNull LifecycleEventManager<Plugin> getLifecycleManager();
++    // Paper end - lifecycle events
+ }
+diff --git a/src/main/java/org/bukkit/plugin/java/JavaPlugin.java b/src/main/java/org/bukkit/plugin/java/JavaPlugin.java
+index 5cd236965de12392d8c7aa81307c0ff1cc8673b1..34037d3da2c536bac088e0ff629ee8f1daccc65b 100644
+--- a/src/main/java/org/bukkit/plugin/java/JavaPlugin.java
++++ b/src/main/java/org/bukkit/plugin/java/JavaPlugin.java
+@@ -47,6 +47,11 @@ public abstract class JavaPlugin extends PluginBase {
+     private FileConfiguration newConfig = null;
+     private File configFile = null;
+     private Logger logger = null; // Paper - PluginLogger -> Logger
++    // Paper start - lifecycle events
++    @SuppressWarnings("deprecation")
++    private final io.papermc.paper.plugin.lifecycle.event.LifecycleEventManager<org.bukkit.plugin.Plugin> lifecycleEventManager = org.bukkit.Bukkit.getUnsafe().createPluginLifecycleEventManager(this, () -> this.allowsLifecycleRegistration);
++    private boolean allowsLifecycleRegistration = true;
++    // Paper end
+ 
+     public JavaPlugin() {
+         // Paper start
+@@ -278,7 +283,9 @@ public abstract class JavaPlugin extends PluginBase {
+             isEnabled = enabled;
+ 
+             if (isEnabled) {
++                try { // Paper - lifecycle events
+                 onEnable();
++                } finally { this.allowsLifecycleRegistration = false; } // Paper - lifecycle events
+             } else {
+                 onDisable();
+             }
+@@ -456,4 +463,11 @@ public abstract class JavaPlugin extends PluginBase {
+         }
+         return plugin;
+     }
++
++    // Paper start - lifecycle events
++    @Override
++    public final io.papermc.paper.plugin.lifecycle.event.@NotNull LifecycleEventManager<org.bukkit.plugin.Plugin> getLifecycleManager() {
++        return this.lifecycleEventManager;
++    }
++    // Paper end - lifecycle events
+ }
+diff --git a/src/test/java/org/bukkit/plugin/TestPlugin.java b/src/test/java/org/bukkit/plugin/TestPlugin.java
+index 43b58e920e739bb949ac0673e9ef73ba7b500dc9..affe88cf8e98a787e197936f5fc443464a2343c6 100644
+--- a/src/test/java/org/bukkit/plugin/TestPlugin.java
++++ b/src/test/java/org/bukkit/plugin/TestPlugin.java
+@@ -133,4 +133,11 @@ public class TestPlugin extends PluginBase {
+     public List<String> onTabComplete(CommandSender sender, Command command, String alias, String[] args) {
+         throw new UnsupportedOperationException("Not supported.");
+     }
++
++    // Paper start - lifecycle events
++    @Override
++    public io.papermc.paper.plugin.lifecycle.event.LifecycleEventManager<Plugin> getLifecycleManager() {
++        throw new UnsupportedOperationException("Not supported.");
++    }
++    // Paper end - lifecycle events
+ }

patches/server/1046-Add-Lifecycle-Event-system.patch

@@ -0,0 +1,781 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Jake Potrebic <jake.m.potrebic@gmail.com>
+Date: Tue, 18 Jul 2023 17:49:38 -0700
+Subject: [PATCH] Add Lifecycle Event system
+
+This event system is separate from Bukkit's event system and is
+meant for managing resources across reloads and from points in the
+PluginBootstrap.
+
+diff --git a/src/main/java/io/papermc/paper/plugin/bootstrap/PluginBootstrapContextImpl.java b/src/main/java/io/papermc/paper/plugin/bootstrap/PluginBootstrapContextImpl.java
+index 30b50e6294c6eaade5e17cfaf34600d122e6251c..0bb7694188d5fb75bb756ce75d0060ea980027ee 100644
+--- a/src/main/java/io/papermc/paper/plugin/bootstrap/PluginBootstrapContextImpl.java
++++ b/src/main/java/io/papermc/paper/plugin/bootstrap/PluginBootstrapContextImpl.java
+@@ -1,6 +1,8 @@
+ package io.papermc.paper.plugin.bootstrap;
+ 
+ import io.papermc.paper.plugin.configuration.PluginMeta;
++import io.papermc.paper.plugin.lifecycle.event.LifecycleEventManager;
++import io.papermc.paper.plugin.lifecycle.event.PaperLifecycleEventManager;
+ import io.papermc.paper.plugin.provider.PluginProvider;
+ import java.nio.file.Path;
+ import net.kyori.adventure.text.logger.slf4j.ComponentLogger;
+@@ -12,6 +14,10 @@ public final class PluginBootstrapContextImpl implements BootstrapContext {
+     private final Path dataFolder;
+     private final ComponentLogger logger;
+     private final Path pluginSource;
++    // Paper start - lifecycle events
++    private boolean allowsLifecycleRegistration = true;
++    private final PaperLifecycleEventManager<BootstrapContext> lifecycleEventManager = new PaperLifecycleEventManager<>(this, () -> this.allowsLifecycleRegistration); // Paper - lifecycle events
++    // Paper end - lifecycle events
+ 
+     public PluginBootstrapContextImpl(PluginMeta config, Path dataFolder, ComponentLogger logger, Path pluginSource) {
+         this.config = config;
+@@ -45,4 +51,20 @@ public final class PluginBootstrapContextImpl implements BootstrapContext {
+     public @NotNull Path getPluginSource() {
+         return this.pluginSource;
+     }
++
++    // Paper start - lifecycle event system
++    @Override
++    public @NotNull PluginMeta getPluginMeta() {
++        return this.config;
++    }
++
++    @Override
++    public LifecycleEventManager<BootstrapContext> getLifecycleManager() {
++        return this.lifecycleEventManager;
++    }
++
++    public void lockLifecycleEventRegistration() {
++        this.allowsLifecycleRegistration = false;
++    }
++    // Paper end
+ }
+diff --git a/src/main/java/io/papermc/paper/plugin/lifecycle/event/LifecycleEventRunner.java b/src/main/java/io/papermc/paper/plugin/lifecycle/event/LifecycleEventRunner.java
+new file mode 100644
+index 0000000000000000000000000000000000000000..f84c9c80e701231e5c33ac3c5573f1093e80f38b
+--- /dev/null
++++ b/src/main/java/io/papermc/paper/plugin/lifecycle/event/LifecycleEventRunner.java
+@@ -0,0 +1,110 @@
++package io.papermc.paper.plugin.lifecycle.event;
++
++import com.google.common.base.Suppliers;
++import com.mojang.logging.LogUtils;
++import io.papermc.paper.plugin.bootstrap.BootstrapContext;
++import io.papermc.paper.plugin.lifecycle.event.registrar.PaperRegistrar;
++import io.papermc.paper.plugin.lifecycle.event.registrar.RegistrarEvent;
++import io.papermc.paper.plugin.lifecycle.event.registrar.RegistrarEventImpl;
++import io.papermc.paper.plugin.lifecycle.event.registrar.ReloadableRegistrarEvent;
++import io.papermc.paper.plugin.lifecycle.event.types.AbstractLifecycleEventType;
++import io.papermc.paper.plugin.lifecycle.event.types.LifecycleEventType;
++import io.papermc.paper.plugin.lifecycle.event.types.OwnerAwareLifecycleEvent;
++import java.util.ArrayList;
++import java.util.List;
++import java.util.Set;
++import java.util.function.Predicate;
++import java.util.function.Supplier;
++import org.bukkit.plugin.Plugin;
++import org.checkerframework.checker.nullness.qual.NonNull;
++import org.checkerframework.checker.nullness.qual.Nullable;
++import org.checkerframework.framework.qual.DefaultQualifier;
++import org.slf4j.Logger;
++
++@DefaultQualifier(NonNull.class)
++public class LifecycleEventRunner {
++
++    private static final Logger LOGGER = LogUtils.getClassLogger();
++    private static final Supplier<Set<LifecycleEventType<?, ?, ?>>> BLOCKS_RELOADING = Suppliers.memoize(() -> Set.of( // lazy due to cyclic initialization
++    ));
++    public static final LifecycleEventRunner INSTANCE = new LifecycleEventRunner();
++
++    private final List<LifecycleEventType<?, ?, ?>> lifecycleEventTypes = new ArrayList<>();
++    private boolean blockPluginReloading = false;
++
++    public void checkRegisteredHandler(final LifecycleEventOwner owner, final LifecycleEventType<?, ?, ?> eventType) {
++        /*
++        Lifecycle event handlers for reloadable events that are registered from the BootstrapContext prevent
++        the server from reloading plugins. This is because reloading plugins requires disabling all the plugins,
++        running the reload logic (which would include places where these events should fire) and then re-enabling plugins.
++         */
++        if (owner instanceof BootstrapContext && BLOCKS_RELOADING.get().contains(eventType)) {
++            this.blockPluginReloading = true;
++        }
++    }
++
++    public boolean blocksPluginReloading() {
++        return this.blockPluginReloading;
++    }
++
++    public <O extends LifecycleEventOwner, E extends LifecycleEvent, ET extends LifecycleEventType<O, E, ?>> ET addEventType(final ET eventType) {
++        this.lifecycleEventTypes.add(eventType);
++        return eventType;
++    }
++
++    public <O extends LifecycleEventOwner, E extends PaperLifecycleEvent> void callEvent(final LifecycleEventType<O, ? super E, ?> eventType, final E event) {
++        this.callEvent(eventType, event, $ -> true);
++    }
++
++    public <O extends LifecycleEventOwner, E extends PaperLifecycleEvent> void callEvent(final LifecycleEventType<O, ? super E, ?> eventType, final E event, final Predicate<? super O> ownerPredicate) {
++        final AbstractLifecycleEventType<O, ? super E, ?, ?> lifecycleEventType = (AbstractLifecycleEventType<O, ? super E, ?, ?>) eventType;
++        lifecycleEventType.forEachHandler(registeredHandler -> {
++            try {
++                if (event instanceof final OwnerAwareLifecycleEvent<?> ownerAwareEvent) {
++                    ownerAwareGenericHelper(ownerAwareEvent, registeredHandler.owner());
++                }
++                registeredHandler.lifecycleEventHandler().run(event);
++            } catch (final Throwable ex) {
++                LOGGER.error("Could not run '{}' lifecycle event handler from {}", lifecycleEventType.name(), registeredHandler.owner().getPluginMeta().getDisplayName(), ex);
++            } finally {
++                if (event instanceof final OwnerAwareLifecycleEvent<?> ownerAwareEvent) {
++                    ownerAwareEvent.setOwner(null);
++                }
++            }
++        }, handler -> ownerPredicate.test(handler.owner()));
++        event.invalidate();
++    }
++
++    private static <O extends LifecycleEventOwner> void ownerAwareGenericHelper(final OwnerAwareLifecycleEvent<O> event, final LifecycleEventOwner possibleOwner) {
++        final @Nullable O owner = event.castOwner(possibleOwner);
++        if (owner != null) {
++            event.setOwner(owner);
++        } else {
++            throw new IllegalStateException("Found invalid owner " + possibleOwner + " for event " + event);
++        }
++    }
++
++    public void unregisterAllEventHandlersFor(final Plugin plugin) {
++        for (final LifecycleEventType<?, ?, ?> lifecycleEventType : this.lifecycleEventTypes) {
++            this.removeEventHandlersOwnedBy(lifecycleEventType, plugin);
++        }
++    }
++
++    private <O extends LifecycleEventOwner> void removeEventHandlersOwnedBy(final LifecycleEventType<O, ?, ?> eventType, final Plugin possibleOwner) {
++        final AbstractLifecycleEventType<O, ?, ?, ?> lifecycleEventType = (AbstractLifecycleEventType<O, ?, ?, ?>) eventType;
++        lifecycleEventType.removeMatching(registeredHandler -> registeredHandler.owner().getPluginMeta().getName().equals(possibleOwner.getPluginMeta().getName()));
++    }
++
++    @SuppressWarnings("unchecked")
++    public <O extends LifecycleEventOwner, R extends PaperRegistrar<? super O>> void callStaticRegistrarEvent(final LifecycleEventType<O, ? extends RegistrarEvent<? super R>, ?> lifecycleEventType, final R registrar, final Class<? extends O> ownerClass) {
++        this.callEvent((LifecycleEventType<O, RegistrarEvent<? super R>, ?>) lifecycleEventType, new RegistrarEventImpl<>(registrar, ownerClass), ownerClass::isInstance);
++    }
++
++    @SuppressWarnings("unchecked")
++    public <O extends LifecycleEventOwner, R extends PaperRegistrar<? super O>> void callReloadableRegistrarEvent(final LifecycleEventType<O, ? extends ReloadableRegistrarEvent<? super R>, ?> lifecycleEventType, final R registrar, final Class<? extends O> ownerClass, final ReloadableRegistrarEvent.Cause cause) {
++        this.callEvent((LifecycleEventType<O, ReloadableRegistrarEvent<? super R>, ?>) lifecycleEventType, new RegistrarEventImpl.ReloadableImpl<>(registrar, ownerClass, cause), ownerClass::isInstance);
++    }
++
++    private LifecycleEventRunner() {
++    }
++}
+diff --git a/src/main/java/io/papermc/paper/plugin/lifecycle/event/PaperLifecycleEvent.java b/src/main/java/io/papermc/paper/plugin/lifecycle/event/PaperLifecycleEvent.java
+new file mode 100644
+index 0000000000000000000000000000000000000000..e941405269a773e8a77e26ffd1afd84f53fadff5
+--- /dev/null
++++ b/src/main/java/io/papermc/paper/plugin/lifecycle/event/PaperLifecycleEvent.java
+@@ -0,0 +1,10 @@
++package io.papermc.paper.plugin.lifecycle.event;
++
++public interface PaperLifecycleEvent extends LifecycleEvent {
++
++    // called after all handlers have been run. Can be
++    // used to invalid various contexts to plugins can't
++    // try to re-use them by storing them from the event
++    default void invalidate() {
++    }
++}
+diff --git a/src/main/java/io/papermc/paper/plugin/lifecycle/event/PaperLifecycleEventManager.java b/src/main/java/io/papermc/paper/plugin/lifecycle/event/PaperLifecycleEventManager.java
+new file mode 100644
+index 0000000000000000000000000000000000000000..f1be5b9a29435bae0afd2bd951bfe88d1669e7eb
+--- /dev/null
++++ b/src/main/java/io/papermc/paper/plugin/lifecycle/event/PaperLifecycleEventManager.java
+@@ -0,0 +1,26 @@
++package io.papermc.paper.plugin.lifecycle.event;
++
++import com.google.common.base.Preconditions;
++import io.papermc.paper.plugin.lifecycle.event.handler.configuration.AbstractLifecycleEventHandlerConfiguration;
++import io.papermc.paper.plugin.lifecycle.event.handler.configuration.LifecycleEventHandlerConfiguration;
++import java.util.function.BooleanSupplier;
++import org.checkerframework.checker.nullness.qual.NonNull;
++import org.checkerframework.framework.qual.DefaultQualifier;
++
++@DefaultQualifier(NonNull.class)
++public final class PaperLifecycleEventManager<O extends LifecycleEventOwner> implements LifecycleEventManager<O> {
++
++    private final O owner;
++    public final BooleanSupplier registrationCheck;
++
++    public PaperLifecycleEventManager(final O owner, final BooleanSupplier registrationCheck) {
++        this.owner = owner;
++        this.registrationCheck = registrationCheck;
++    }
++
++    @Override
++    public void registerEventHandler(final LifecycleEventHandlerConfiguration<? super O> handlerConfiguration) {
++        Preconditions.checkState(this.registrationCheck.getAsBoolean(), "Cannot register lifecycle event handlers");
++        ((AbstractLifecycleEventHandlerConfiguration<? super O, ?, ?>) handlerConfiguration).registerFrom(this.owner);
++    }
++}
+diff --git a/src/main/java/io/papermc/paper/plugin/lifecycle/event/handler/configuration/AbstractLifecycleEventHandlerConfiguration.java b/src/main/java/io/papermc/paper/plugin/lifecycle/event/handler/configuration/AbstractLifecycleEventHandlerConfiguration.java
+new file mode 100644
+index 0000000000000000000000000000000000000000..6a85a4f581612efff04c1a955493aa2e32476277
+--- /dev/null
++++ b/src/main/java/io/papermc/paper/plugin/lifecycle/event/handler/configuration/AbstractLifecycleEventHandlerConfiguration.java
+@@ -0,0 +1,26 @@
++package io.papermc.paper.plugin.lifecycle.event.handler.configuration;
++
++import io.papermc.paper.plugin.lifecycle.event.LifecycleEvent;
++import io.papermc.paper.plugin.lifecycle.event.LifecycleEventOwner;
++import io.papermc.paper.plugin.lifecycle.event.handler.LifecycleEventHandler;
++import io.papermc.paper.plugin.lifecycle.event.types.AbstractLifecycleEventType;
++import org.checkerframework.checker.nullness.qual.NonNull;
++import org.checkerframework.framework.qual.DefaultQualifier;
++
++@DefaultQualifier(NonNull.class)
++public abstract class AbstractLifecycleEventHandlerConfiguration<O extends LifecycleEventOwner, E extends LifecycleEvent, CI extends AbstractLifecycleEventHandlerConfiguration<O, E, CI>> implements LifecycleEventHandlerConfiguration<O> {
++
++    private final LifecycleEventHandler<? super E> handler;
++    private final AbstractLifecycleEventType<O, E, ?, CI> type;
++
++    protected AbstractLifecycleEventHandlerConfiguration(final LifecycleEventHandler<? super E> handler, final AbstractLifecycleEventType<O, E, ?, CI> type) {
++        this.handler = handler;
++        this.type = type;
++    }
++
++    public abstract CI config();
++
++    public final void registerFrom(final O owner) {
++        this.type.tryRegister(owner, this.handler, this.config());
++    }
++}
+diff --git a/src/main/java/io/papermc/paper/plugin/lifecycle/event/handler/configuration/MonitorLifecycleEventHandlerConfigurationImpl.java b/src/main/java/io/papermc/paper/plugin/lifecycle/event/handler/configuration/MonitorLifecycleEventHandlerConfigurationImpl.java
+new file mode 100644
+index 0000000000000000000000000000000000000000..e0699fcd0a098abc5e1206e7c0fa80b96eca7884
+--- /dev/null
++++ b/src/main/java/io/papermc/paper/plugin/lifecycle/event/handler/configuration/MonitorLifecycleEventHandlerConfigurationImpl.java
+@@ -0,0 +1,33 @@
++package io.papermc.paper.plugin.lifecycle.event.handler.configuration;
++
++import io.papermc.paper.plugin.lifecycle.event.LifecycleEvent;
++import io.papermc.paper.plugin.lifecycle.event.LifecycleEventOwner;
++import io.papermc.paper.plugin.lifecycle.event.handler.LifecycleEventHandler;
++import io.papermc.paper.plugin.lifecycle.event.types.AbstractLifecycleEventType;
++import org.checkerframework.checker.nullness.qual.NonNull;
++import org.checkerframework.framework.qual.DefaultQualifier;
++
++@DefaultQualifier(NonNull.class)
++public class MonitorLifecycleEventHandlerConfigurationImpl<O extends LifecycleEventOwner, E extends LifecycleEvent> extends AbstractLifecycleEventHandlerConfiguration<O, E, MonitorLifecycleEventHandlerConfigurationImpl<O, E>> implements MonitorLifecycleEventHandlerConfiguration<O> {
++
++    private boolean monitor = false;
++
++    public MonitorLifecycleEventHandlerConfigurationImpl(final LifecycleEventHandler<? super E> handler, final AbstractLifecycleEventType<O, E, ?, MonitorLifecycleEventHandlerConfigurationImpl<O, E>> eventType) {
++        super(handler, eventType);
++    }
++
++    @Override
++    public MonitorLifecycleEventHandlerConfigurationImpl<O, E> config() {
++        return this;
++    }
++
++    public boolean isMonitor() {
++        return this.monitor;
++    }
++
++    @Override
++    public MonitorLifecycleEventHandlerConfiguration<O> monitor() {
++        this.monitor = true;
++        return this;
++    }
++}
+diff --git a/src/main/java/io/papermc/paper/plugin/lifecycle/event/handler/configuration/PrioritizedLifecycleEventHandlerConfigurationImpl.java b/src/main/java/io/papermc/paper/plugin/lifecycle/event/handler/configuration/PrioritizedLifecycleEventHandlerConfigurationImpl.java
+new file mode 100644
+index 0000000000000000000000000000000000000000..c1d0070fc1594f7a7c29d7dc679da7b347a7140b
+--- /dev/null
++++ b/src/main/java/io/papermc/paper/plugin/lifecycle/event/handler/configuration/PrioritizedLifecycleEventHandlerConfigurationImpl.java
+@@ -0,0 +1,43 @@
++package io.papermc.paper.plugin.lifecycle.event.handler.configuration;
++
++import io.papermc.paper.plugin.lifecycle.event.LifecycleEvent;
++import io.papermc.paper.plugin.lifecycle.event.LifecycleEventOwner;
++import io.papermc.paper.plugin.lifecycle.event.handler.LifecycleEventHandler;
++import io.papermc.paper.plugin.lifecycle.event.types.AbstractLifecycleEventType;
++import java.util.OptionalInt;
++import org.checkerframework.checker.nullness.qual.NonNull;
++import org.checkerframework.framework.qual.DefaultQualifier;
++
++@DefaultQualifier(NonNull.class)
++public class PrioritizedLifecycleEventHandlerConfigurationImpl<O extends LifecycleEventOwner, E extends LifecycleEvent> extends AbstractLifecycleEventHandlerConfiguration<O, E, PrioritizedLifecycleEventHandlerConfigurationImpl<O, E>> implements PrioritizedLifecycleEventHandlerConfiguration<O> {
++
++    private static final OptionalInt DEFAULT_PRIORITY = OptionalInt.of(0);
++    private static final OptionalInt MONITOR_PRIORITY = OptionalInt.empty();
++
++    private OptionalInt priority = DEFAULT_PRIORITY;
++
++    public PrioritizedLifecycleEventHandlerConfigurationImpl(final LifecycleEventHandler<? super E> handler, final AbstractLifecycleEventType<O, E, ?, PrioritizedLifecycleEventHandlerConfigurationImpl<O, E>> eventType) {
++        super(handler, eventType);
++    }
++
++    @Override
++    public PrioritizedLifecycleEventHandlerConfigurationImpl<O, E> config() {
++        return this;
++    }
++
++    public OptionalInt priority() {
++        return this.priority;
++    }
++
++    @Override
++    public PrioritizedLifecycleEventHandlerConfiguration<O> priority(final int priority) {
++        this.priority = OptionalInt.of(priority);
++        return this;
++    }
++
++    @Override
++    public PrioritizedLifecycleEventHandlerConfiguration<O> monitor() {
++        this.priority = MONITOR_PRIORITY;
++        return this;
++    }
++}
+diff --git a/src/main/java/io/papermc/paper/plugin/lifecycle/event/registrar/PaperRegistrar.java b/src/main/java/io/papermc/paper/plugin/lifecycle/event/registrar/PaperRegistrar.java
+new file mode 100644
+index 0000000000000000000000000000000000000000..b2586c881988fbabe07eef1b43eb1b55f2d3fa52
+--- /dev/null
++++ b/src/main/java/io/papermc/paper/plugin/lifecycle/event/registrar/PaperRegistrar.java
+@@ -0,0 +1,15 @@
++package io.papermc.paper.plugin.lifecycle.event.registrar;
++
++import io.papermc.paper.plugin.lifecycle.event.LifecycleEventOwner;
++import org.checkerframework.checker.nullness.qual.NonNull;
++import org.checkerframework.checker.nullness.qual.Nullable;
++import org.checkerframework.framework.qual.DefaultQualifier;
++
++@DefaultQualifier(NonNull.class)
++public interface PaperRegistrar<O extends LifecycleEventOwner> extends Registrar {
++
++    void setCurrentContext(@Nullable O owner);
++
++    default void invalidate() {
++    }
++}
+diff --git a/src/main/java/io/papermc/paper/plugin/lifecycle/event/registrar/RegistrarEventImpl.java b/src/main/java/io/papermc/paper/plugin/lifecycle/event/registrar/RegistrarEventImpl.java
+new file mode 100644
+index 0000000000000000000000000000000000000000..6d530c52aaf0dc2cdfe3bd56af557274a7f44256
+--- /dev/null
++++ b/src/main/java/io/papermc/paper/plugin/lifecycle/event/registrar/RegistrarEventImpl.java
+@@ -0,0 +1,70 @@
++package io.papermc.paper.plugin.lifecycle.event.registrar;
++
++import io.papermc.paper.plugin.lifecycle.event.LifecycleEventOwner;
++import io.papermc.paper.plugin.lifecycle.event.PaperLifecycleEvent;
++import io.papermc.paper.plugin.lifecycle.event.types.OwnerAwareLifecycleEvent;
++import org.checkerframework.checker.nullness.qual.NonNull;
++import org.checkerframework.checker.nullness.qual.Nullable;
++import org.checkerframework.framework.qual.DefaultQualifier;
++
++@DefaultQualifier(NonNull.class)
++public class RegistrarEventImpl<R extends PaperRegistrar<? super O>, O extends LifecycleEventOwner> implements PaperLifecycleEvent, OwnerAwareLifecycleEvent<O>, RegistrarEvent<R> {
++
++    private final R registrar;
++    private final Class<? extends O> ownerClass;
++
++    public RegistrarEventImpl(final R registrar, final Class<? extends O> ownerClass) {
++        this.registrar = registrar;
++        this.ownerClass = ownerClass;
++    }
++
++    @Override
++    public R registrar() {
++        return this.registrar;
++    }
++
++    @Override
++    public final void setOwner(final @Nullable O owner) {
++        this.registrar.setCurrentContext(owner);
++    }
++
++    @Override
++    public final @Nullable O castOwner(final LifecycleEventOwner owner) {
++        return this.ownerClass.isInstance(owner) ? this.ownerClass.cast(owner) : null;
++    }
++
++    @Override
++    public void invalidate() {
++        this.registrar.invalidate();
++    }
++
++    @Override
++    public String toString() {
++        return "RegistrarEventImpl{" +
++            "registrar=" + this.registrar +
++            ", ownerClass=" + this.ownerClass +
++            '}';
++    }
++
++    public static class ReloadableImpl<R extends PaperRegistrar<? super O>, O extends LifecycleEventOwner> extends RegistrarEventImpl<R, O> implements ReloadableRegistrarEvent<R> {
++
++        private final ReloadableRegistrarEvent.Cause cause;
++
++        public ReloadableImpl(final R registrar, final Class<? extends O> ownerClass, final Cause cause) {
++            super(registrar, ownerClass);
++            this.cause = cause;
++        }
++
++        @Override
++        public Cause cause() {
++            return this.cause;
++        }
++
++        @Override
++        public String toString() {
++            return "ReloadableImpl{" +
++                "cause=" + this.cause +
++                "} " + super.toString();
++        }
++    }
++}
+diff --git a/src/main/java/io/papermc/paper/plugin/lifecycle/event/types/AbstractLifecycleEventType.java b/src/main/java/io/papermc/paper/plugin/lifecycle/event/types/AbstractLifecycleEventType.java
+new file mode 100644
+index 0000000000000000000000000000000000000000..a65fb37f4a729e2fe9fb81af822db626ec7e6d7b
+--- /dev/null
++++ b/src/main/java/io/papermc/paper/plugin/lifecycle/event/types/AbstractLifecycleEventType.java
+@@ -0,0 +1,50 @@
++package io.papermc.paper.plugin.lifecycle.event.types;
++
++import io.papermc.paper.plugin.lifecycle.event.LifecycleEvent;
++import io.papermc.paper.plugin.lifecycle.event.LifecycleEventOwner;
++import io.papermc.paper.plugin.lifecycle.event.LifecycleEventRunner;
++import io.papermc.paper.plugin.lifecycle.event.handler.LifecycleEventHandler;
++import io.papermc.paper.plugin.lifecycle.event.handler.configuration.AbstractLifecycleEventHandlerConfiguration;
++import io.papermc.paper.plugin.lifecycle.event.handler.configuration.LifecycleEventHandlerConfiguration;
++import java.util.function.Consumer;
++import java.util.function.Predicate;
++import org.checkerframework.checker.nullness.qual.NonNull;
++import org.checkerframework.framework.qual.DefaultQualifier;
++
++@DefaultQualifier(NonNull.class)
++public abstract class AbstractLifecycleEventType<O extends LifecycleEventOwner, E extends LifecycleEvent, C extends LifecycleEventHandlerConfiguration<O>, CI extends AbstractLifecycleEventHandlerConfiguration<O, E, CI>> implements LifecycleEventType<O, E, C> {
++
++    private final String name;
++    private final Class<? extends O> ownerType;
++
++    protected AbstractLifecycleEventType(final String name, final Class<? extends O> ownerType) {
++        this.name = name;
++        this.ownerType = ownerType;
++    }
++
++    @Override
++    public String name() {
++        return this.name;
++    }
++
++    private void verifyOwner(final O owner) {
++        if (!this.ownerType.isInstance(owner)) {
++            throw new IllegalArgumentException("You cannot register the lifecycle event '" + this.name + "' on " + owner);
++        }
++    }
++
++    public abstract void forEachHandler(Consumer<? super RegisteredHandler<O, E>> consumer, Predicate<? super RegisteredHandler<O, E>> predicate);
++
++    public abstract void removeMatching(Predicate<? super RegisteredHandler<O, E>> predicate);
++
++    protected abstract void register(O owner, LifecycleEventHandler<? super E> handler, CI config);
++
++    public final void tryRegister(final O owner, final LifecycleEventHandler<? super E> handler, final CI config) {
++        this.verifyOwner(owner);
++        LifecycleEventRunner.INSTANCE.checkRegisteredHandler(owner, this);
++        this.register(owner, handler, config);
++    }
++
++    public record RegisteredHandler<O, E extends LifecycleEvent>(O owner, LifecycleEventHandler<? super E> lifecycleEventHandler) {
++    }
++}
+diff --git a/src/main/java/io/papermc/paper/plugin/lifecycle/event/types/LifecycleEventTypeProviderImpl.java b/src/main/java/io/papermc/paper/plugin/lifecycle/event/types/LifecycleEventTypeProviderImpl.java
+new file mode 100644
+index 0000000000000000000000000000000000000000..0886edad92b40276f268bd745b31bac359fd28af
+--- /dev/null
++++ b/src/main/java/io/papermc/paper/plugin/lifecycle/event/types/LifecycleEventTypeProviderImpl.java
+@@ -0,0 +1,25 @@
++package io.papermc.paper.plugin.lifecycle.event.types;
++
++import io.papermc.paper.plugin.lifecycle.event.LifecycleEvent;
++import io.papermc.paper.plugin.lifecycle.event.LifecycleEventOwner;
++import io.papermc.paper.plugin.lifecycle.event.LifecycleEventRunner;
++import org.checkerframework.checker.nullness.qual.NonNull;
++import org.checkerframework.framework.qual.DefaultQualifier;
++
++@DefaultQualifier(NonNull.class)
++public final class LifecycleEventTypeProviderImpl implements LifecycleEventTypeProvider {
++
++    public static LifecycleEventTypeProviderImpl instance() {
++        return (LifecycleEventTypeProviderImpl) LifecycleEventTypeProvider.PROVIDER;
++    }
++
++    @Override
++    public <O extends LifecycleEventOwner, E extends LifecycleEvent> LifecycleEventType.Monitorable<O, E> monitor(final String name, final Class<? extends O> ownerType) {
++        return LifecycleEventRunner.INSTANCE.addEventType(new MonitorableLifecycleEventType<>(name, ownerType));
++    }
++
++    @Override
++    public <O extends LifecycleEventOwner, E extends LifecycleEvent> LifecycleEventType.Prioritizable<O, E> prioritized(final String name, final Class<? extends O> ownerType) {
++        return LifecycleEventRunner.INSTANCE.addEventType(new PrioritizableLifecycleEventType<>(name, ownerType));
++    }
++}
+diff --git a/src/main/java/io/papermc/paper/plugin/lifecycle/event/types/MonitorableLifecycleEventType.java b/src/main/java/io/papermc/paper/plugin/lifecycle/event/types/MonitorableLifecycleEventType.java
+new file mode 100644
+index 0000000000000000000000000000000000000000..6d92c1d3adf220154dfe7cba3a3f8158356c3e3c
+--- /dev/null
++++ b/src/main/java/io/papermc/paper/plugin/lifecycle/event/types/MonitorableLifecycleEventType.java
+@@ -0,0 +1,54 @@
++package io.papermc.paper.plugin.lifecycle.event.types;
++
++import io.papermc.paper.plugin.lifecycle.event.LifecycleEvent;
++import io.papermc.paper.plugin.lifecycle.event.LifecycleEventOwner;
++import io.papermc.paper.plugin.lifecycle.event.handler.LifecycleEventHandler;
++import io.papermc.paper.plugin.lifecycle.event.handler.configuration.MonitorLifecycleEventHandlerConfiguration;
++import io.papermc.paper.plugin.lifecycle.event.handler.configuration.MonitorLifecycleEventHandlerConfigurationImpl;
++import java.util.ArrayList;
++import java.util.List;
++import java.util.function.Consumer;
++import java.util.function.Predicate;
++import org.checkerframework.checker.nullness.qual.NonNull;
++import org.checkerframework.framework.qual.DefaultQualifier;
++
++@DefaultQualifier(NonNull.class)
++public class MonitorableLifecycleEventType<O extends LifecycleEventOwner, E extends LifecycleEvent> extends AbstractLifecycleEventType<O, E, MonitorLifecycleEventHandlerConfiguration<O>, MonitorLifecycleEventHandlerConfigurationImpl<O, E>> implements LifecycleEventType.Monitorable<O, E> {
++
++    final List<RegisteredHandler<O, E>> handlers = new ArrayList<>();
++    int nonMonitorIdx = 0;
++
++    public MonitorableLifecycleEventType(final String name, final Class<? extends O> ownerType) {
++        super(name, ownerType);
++    }
++
++    @Override
++    public MonitorLifecycleEventHandlerConfigurationImpl<O, E> newHandler(final LifecycleEventHandler<? super E> handler) {
++        return new MonitorLifecycleEventHandlerConfigurationImpl<>(handler, this);
++    }
++
++    @Override
++    protected void register(final O owner, final LifecycleEventHandler<? super E> handler, final MonitorLifecycleEventHandlerConfigurationImpl<O, E> config) {
++        final RegisteredHandler<O, E> registeredHandler = new RegisteredHandler<>(owner, handler);
++        if (!config.isMonitor()) {
++            this.handlers.add(this.nonMonitorIdx, registeredHandler);
++            this.nonMonitorIdx++;
++        } else {
++            this.handlers.add(registeredHandler);
++        }
++    }
++
++    @Override
++    public void forEachHandler(final Consumer<? super RegisteredHandler<O, E>> consumer, final Predicate<? super RegisteredHandler<O, E>> predicate) {
++        for (final RegisteredHandler<O, E> handler : this.handlers) {
++            if (predicate.test(handler)) {
++                consumer.accept(handler);
++            }
++        }
++    }
++
++    @Override
++    public void removeMatching(final Predicate<? super RegisteredHandler<O, E>> predicate) {
++        this.handlers.removeIf(predicate);
++    }
++}
+diff --git a/src/main/java/io/papermc/paper/plugin/lifecycle/event/types/OwnerAwareLifecycleEvent.java b/src/main/java/io/papermc/paper/plugin/lifecycle/event/types/OwnerAwareLifecycleEvent.java
+new file mode 100644
+index 0000000000000000000000000000000000000000..3e7e7474f301c0725fa2bcd6e19e476fc35f2d5a
+--- /dev/null
++++ b/src/main/java/io/papermc/paper/plugin/lifecycle/event/types/OwnerAwareLifecycleEvent.java
+@@ -0,0 +1,15 @@
++package io.papermc.paper.plugin.lifecycle.event.types;
++
++import io.papermc.paper.plugin.lifecycle.event.LifecycleEvent;
++import io.papermc.paper.plugin.lifecycle.event.LifecycleEventOwner;
++import org.checkerframework.checker.nullness.qual.NonNull;
++import org.checkerframework.checker.nullness.qual.Nullable;
++import org.checkerframework.framework.qual.DefaultQualifier;
++
++@DefaultQualifier(NonNull.class)
++public interface OwnerAwareLifecycleEvent<O extends LifecycleEventOwner> extends LifecycleEvent {
++
++    void setOwner(@Nullable O owner);
++
++    @Nullable O castOwner(LifecycleEventOwner owner);
++}
+diff --git a/src/main/java/io/papermc/paper/plugin/lifecycle/event/types/PrioritizableLifecycleEventType.java b/src/main/java/io/papermc/paper/plugin/lifecycle/event/types/PrioritizableLifecycleEventType.java
+new file mode 100644
+index 0000000000000000000000000000000000000000..6629f7fabf66ce761024268043cc30076ba8a3f1
+--- /dev/null
++++ b/src/main/java/io/papermc/paper/plugin/lifecycle/event/types/PrioritizableLifecycleEventType.java
+@@ -0,0 +1,64 @@
++package io.papermc.paper.plugin.lifecycle.event.types;
++
++import io.papermc.paper.plugin.lifecycle.event.LifecycleEvent;
++import io.papermc.paper.plugin.lifecycle.event.LifecycleEventOwner;
++import io.papermc.paper.plugin.lifecycle.event.handler.LifecycleEventHandler;
++import io.papermc.paper.plugin.lifecycle.event.handler.configuration.PrioritizedLifecycleEventHandlerConfiguration;
++import io.papermc.paper.plugin.lifecycle.event.handler.configuration.PrioritizedLifecycleEventHandlerConfigurationImpl;
++import java.util.ArrayList;
++import java.util.Comparator;
++import java.util.List;
++import java.util.OptionalInt;
++import java.util.function.Consumer;
++import java.util.function.Predicate;
++import org.checkerframework.checker.nullness.qual.NonNull;
++import org.checkerframework.framework.qual.DefaultQualifier;
++
++@DefaultQualifier(NonNull.class)
++public class PrioritizableLifecycleEventType<O extends LifecycleEventOwner, E extends LifecycleEvent> extends AbstractLifecycleEventType<O, E, PrioritizedLifecycleEventHandlerConfiguration<O>, PrioritizedLifecycleEventHandlerConfigurationImpl<O, E>> implements LifecycleEventType.Prioritizable<O, E> {
++
++    private static final Comparator<PrioritizedHandler<?, ?>> COMPARATOR = Comparator.comparing(PrioritizedHandler::priority, (o1, o2) -> {
++        if (o1.equals(o2)) {
++            return 0;
++        } else if (o1.isEmpty()) {
++            return 1;
++        } else if (o2.isEmpty()) {
++            return -1;
++        } else {
++            return Integer.compare(o1.getAsInt(), o2.getAsInt());
++        }
++    });
++
++    private final List<PrioritizedHandler<O, E>> handlers = new ArrayList<>();
++
++    public PrioritizableLifecycleEventType(final String name, final Class<? extends O> ownerType) {
++        super(name, ownerType);
++    }
++
++    @Override
++    public PrioritizedLifecycleEventHandlerConfiguration<O> newHandler(final LifecycleEventHandler<? super E> handler) {
++        return new PrioritizedLifecycleEventHandlerConfigurationImpl<>(handler, this);
++    }
++
++    @Override
++    protected void register(final O owner, final LifecycleEventHandler<? super E> handler, final PrioritizedLifecycleEventHandlerConfigurationImpl<O, E> config) {
++        this.handlers.add(new PrioritizedHandler<>(new RegisteredHandler<>(owner, handler), config.priority()));
++        this.handlers.sort(COMPARATOR);
++    }
++
++    @Override
++    public void forEachHandler(final Consumer<? super RegisteredHandler<O, E>> consumer, final Predicate<? super RegisteredHandler<O, E>> predicate) {
++        for (final PrioritizedHandler<O, E> handler : this.handlers) {
++            if (predicate.test(handler.handler())) {
++                consumer.accept(handler.handler());
++            }
++        }
++    }
++
++    @Override
++    public void removeMatching(final Predicate<? super RegisteredHandler<O, E>> predicate) {
++        this.handlers.removeIf(prioritizedHandler -> predicate.test(prioritizedHandler.handler()));
++    }
++
++    private record PrioritizedHandler<O extends LifecycleEventOwner, E extends LifecycleEvent>(RegisteredHandler<O, E> handler, OptionalInt priority) {}
++}
+diff --git a/src/main/java/io/papermc/paper/plugin/manager/PaperPluginInstanceManager.java b/src/main/java/io/papermc/paper/plugin/manager/PaperPluginInstanceManager.java
+index eeea1e6f7b1ed64567a3f90d8eb2e2cfd53e5912..eedbf46e04b5ae420f9bedcbc2bbb10643ba7e22 100644
+--- a/src/main/java/io/papermc/paper/plugin/manager/PaperPluginInstanceManager.java
++++ b/src/main/java/io/papermc/paper/plugin/manager/PaperPluginInstanceManager.java
+@@ -279,6 +279,15 @@ class PaperPluginInstanceManager {
+                 + pluginName + " (Is it up to date?)", ex, plugin); // Paper
+         }
+ 
++        // Paper start - lifecycle event system
++        try {
++            io.papermc.paper.plugin.lifecycle.event.LifecycleEventRunner.INSTANCE.unregisterAllEventHandlersFor(plugin);
++        } catch (Throwable ex) {
++            this.handlePluginException("Error occurred (in the plugin loader) while unregistering lifecycle event handlers for "
++                + pluginName + " (Is it up to date?)", ex, plugin);
++        }
++        // Paper end
++
+         try {
+             this.server.getMessenger().unregisterIncomingPluginChannel(plugin);
+             this.server.getMessenger().unregisterOutgoingPluginChannel(plugin);
+diff --git a/src/main/java/io/papermc/paper/plugin/storage/BootstrapProviderStorage.java b/src/main/java/io/papermc/paper/plugin/storage/BootstrapProviderStorage.java
+index 2e96308696e131f3f013469a395e5ddda2c5d529..65a66e484c1c39c5f41d97db52f31c67b4479d20 100644
+--- a/src/main/java/io/papermc/paper/plugin/storage/BootstrapProviderStorage.java
++++ b/src/main/java/io/papermc/paper/plugin/storage/BootstrapProviderStorage.java
+@@ -32,8 +32,9 @@ public class BootstrapProviderStorage extends SimpleProviderStorage<PluginBootst
+             @Override
+             public boolean load(PluginProvider<PluginBootstrap> provider, PluginBootstrap provided) {
+                 try {
+-                    BootstrapContext context = PluginBootstrapContextImpl.create(provider, PluginInitializerManager.instance().pluginDirectoryPath());
++                    PluginBootstrapContextImpl context = PluginBootstrapContextImpl.create(provider, PluginInitializerManager.instance().pluginDirectoryPath()); // Paper - lifecycle events
+                     provided.bootstrap(context);
++                    context.lockLifecycleEventRegistration(); // Paper - lifecycle events
+                     return true;
+                 } catch (Throwable e) {
+                     LOGGER.error("Failed to run bootstrapper for %s. This plugin will not be loaded.".formatted(provider.getSource()), e);
+diff --git a/src/main/java/org/bukkit/craftbukkit/CraftServer.java b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
+index 4df3b94c8126f00188f5e125757411a0359728fa..14d3986ae6ec721f07dc82b37d62d3bea484ad15 100644
+--- a/src/main/java/org/bukkit/craftbukkit/CraftServer.java
++++ b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
+@@ -1005,6 +1005,11 @@ public final class CraftServer implements Server {
+ 
+     @Override
+     public void reload() {
++        // Paper start - lifecycle events
++        if (io.papermc.paper.plugin.lifecycle.event.LifecycleEventRunner.INSTANCE.blocksPluginReloading()) {
++            throw new IllegalStateException("A lifecycle event handler has been registered which makes reloading plugins not possible");
++        }
++        // Paper end - lifecycle events
+         org.spigotmc.WatchdogThread.hasStarted = false; // Paper - Disable watchdog early timeout on reload
+         this.reloadCount++;
+         this.configuration = YamlConfiguration.loadConfiguration(this.getConfigFile());
+diff --git a/src/main/java/org/bukkit/craftbukkit/scheduler/MinecraftInternalPlugin.java b/src/main/java/org/bukkit/craftbukkit/scheduler/MinecraftInternalPlugin.java
+index d96399e9bf1a58db5a4a22e58abb99e7660e0694..66bdac50130f523f9dc4379b103b7a469f9ca36b 100644
+--- a/src/main/java/org/bukkit/craftbukkit/scheduler/MinecraftInternalPlugin.java
++++ b/src/main/java/org/bukkit/craftbukkit/scheduler/MinecraftInternalPlugin.java
+@@ -143,4 +143,11 @@ public class MinecraftInternalPlugin extends PluginBase {
+     public List<String> onTabComplete(CommandSender sender, Command command, String alias, String[] args) {
+         throw new UnsupportedOperationException("Not supported.");
+     }
++
++    // Paper start - lifecycle events
++    @Override
++    public @NotNull io.papermc.paper.plugin.lifecycle.event.LifecycleEventManager<org.bukkit.plugin.Plugin> getLifecycleManager() {
++        throw new UnsupportedOperationException("Not supported.");
++    }
++    // Paper end - lifecycle events
+ }
+diff --git a/src/main/java/org/bukkit/craftbukkit/util/CraftMagicNumbers.java b/src/main/java/org/bukkit/craftbukkit/util/CraftMagicNumbers.java
+index ca5312febcdd467889ad725c0263367bc5fe69f6..f276c5163d29d56cf4ed081d8e75cbcfd28d892f 100644
+--- a/src/main/java/org/bukkit/craftbukkit/util/CraftMagicNumbers.java
++++ b/src/main/java/org/bukkit/craftbukkit/util/CraftMagicNumbers.java
+@@ -654,6 +654,13 @@ public final class CraftMagicNumbers implements UnsafeValues {
+     }
+     // Paper end - spawn egg color visibility
+ 
++    // Paper start - lifecycle event API
++    @Override
++    public io.papermc.paper.plugin.lifecycle.event.LifecycleEventManager<org.bukkit.plugin.Plugin> createPluginLifecycleEventManager(final org.bukkit.plugin.java.JavaPlugin plugin, final java.util.function.BooleanSupplier registrationCheck) {
++        return new io.papermc.paper.plugin.lifecycle.event.PaperLifecycleEventManager<>(plugin, registrationCheck);
++    }
++    // Paper end - lifecycle event API
++
+     /**
+      * This helper class represents the different NBT Tags.
+      * <p>
+diff --git a/src/main/resources/META-INF/services/io.papermc.paper.plugin.lifecycle.event.types.LifecycleEventTypeProvider b/src/main/resources/META-INF/services/io.papermc.paper.plugin.lifecycle.event.types.LifecycleEventTypeProvider
+new file mode 100644
+index 0000000000000000000000000000000000000000..808b1192b60348ad05f0bfbdeda6f94df4876743
+--- /dev/null
++++ b/src/main/resources/META-INF/services/io.papermc.paper.plugin.lifecycle.event.types.LifecycleEventTypeProvider
+@@ -0,0 +1 @@
++io.papermc.paper.plugin.lifecycle.event.types.LifecycleEventTypeProviderImpl
+diff --git a/src/test/java/io/papermc/paper/plugin/PaperTestPlugin.java b/src/test/java/io/papermc/paper/plugin/PaperTestPlugin.java
+index 1d14f530ef888102e47eeeaf0d1a6076e51871c4..90cf0c702ca2ff9de64d9718ecba5f2d128953a6 100644
+--- a/src/test/java/io/papermc/paper/plugin/PaperTestPlugin.java
++++ b/src/test/java/io/papermc/paper/plugin/PaperTestPlugin.java
+@@ -143,4 +143,11 @@ public class PaperTestPlugin extends PluginBase {
+     public List<String> onTabComplete(CommandSender sender, Command command, String alias, String[] args) {
+         throw new UnsupportedOperationException("Not supported.");
+     }
++
++    // Paper start - lifecycle events
++    @Override
++    public io.papermc.paper.plugin.lifecycle.event.LifecycleEventManager<org.bukkit.plugin.Plugin> getLifecycleManager() {
++        throw new UnsupportedOperationException("Not supported.");
++    }
++    // Paper end - lifecycle events
+ }