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Paper/patches/server/0953-Add-Lifecycle-Event-system.patch

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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 834b85f24df023642f8abf7213fe578ac8c17a3e..3e82ea07ca4194844c5528446e2c4a46ff4acee5 100644
--- a/src/main/java/io/papermc/paper/plugin/manager/PaperPluginInstanceManager.java
+++ b/src/main/java/io/papermc/paper/plugin/manager/PaperPluginInstanceManager.java
@@ -293,6 +293,15 @@ 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 b1cfc6f5a2511e9bb145442dfb765951a1ee0fca..b9ad8446d702f729673d75dd6978b9db820f380b 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftServer.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
@@ -1017,6 +1017,11 @@ 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 cf29c541b74ab37592997c31adb7b240d92b2bea..12289984948b0cc34df39767945222616844aebb 100644
--- a/src/main/java/org/bukkit/craftbukkit/util/CraftMagicNumbers.java
+++ b/src/main/java/org/bukkit/craftbukkit/util/CraftMagicNumbers.java
@@ -653,6 +653,13 @@ 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
}
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