Add in java event manager

java/patchbukkit/src/main/java/org/patchbukkit/NativeCallbacks.java

@@ -1,3 +1,4 @@
+// No longer used currently, keeping around for reference in the short term
 package org.patchbukkit;
 
 import org.astonbitecode.j4rs.api.invocation.NativeCallbackToRustChannelSupport;

java/patchbukkit/src/main/java/org/patchbukkit/PatchBukkitEventManager.java

@@ -0,0 +1,327 @@
+// This file was mostly taken from https://github.com/PaperMC/Paper/blob/main/paper-server/src/main/java/io/papermc/paper/plugin/manager/PaperEventManager.java
+package org.patchbukkit;
+
+import co.aikar.timings.TimedEventExecutor;
+import com.destroystokyo.paper.event.server.ServerExceptionEvent;
+import com.destroystokyo.paper.exception.ServerEventException;
+import com.google.common.collect.Sets;
+import java.lang.reflect.Method;
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.Set;
+import java.util.logging.Level;
+import org.bukkit.Server;
+import org.bukkit.Warning;
+import org.bukkit.event.Event;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.EventPriority;
+import org.bukkit.event.HandlerList;
+import org.bukkit.event.Listener;
+import org.bukkit.plugin.AuthorNagException;
+import org.bukkit.plugin.EventExecutor;
+import org.bukkit.plugin.IllegalPluginAccessException;
+import org.bukkit.plugin.Plugin;
+import org.bukkit.plugin.RegisteredListener;
+import org.jetbrains.annotations.NotNull;
+
+public class PatchBukkitEventManager {
+
+    private final Server server;
+
+    public PatchBukkitEventManager(Server server) {
+        this.server = server;
+    }
+
+    public void callEvent(@NotNull Event event) {
+        if (event.isAsynchronous() && this.server.isPrimaryThread()) {
+            throw new IllegalStateException(
+                event.getEventName() + " may only be triggered asynchronously."
+            );
+        } else if (
+            !event.isAsynchronous() &&
+            !this.server.isPrimaryThread() &&
+            !this.server.isStopping()
+        ) {
+            throw new IllegalStateException(
+                event.getEventName() + " may only be triggered synchronously."
+            );
+        }
+
+        HandlerList handlers = event.getHandlers();
+        RegisteredListener[] listeners = handlers.getRegisteredListeners();
+
+        for (RegisteredListener registration : listeners) {
+            if (!registration.getPlugin().isEnabled()) {
+                continue;
+            }
+
+            try {
+                registration.callEvent(event);
+            } catch (AuthorNagException ex) {
+                Plugin plugin = registration.getPlugin();
+
+                if (plugin.isNaggable()) {
+                    plugin.setNaggable(false);
+
+                    this.server.getLogger().log(
+                        Level.SEVERE,
+                        String.format(
+                            "Nag author(s): '%s' of '%s' about the following: %s",
+                            plugin.getPluginMeta().getAuthors(),
+                            plugin.getPluginMeta().getDisplayName(),
+                            ex.getMessage()
+                        )
+                    );
+                }
+            } catch (Throwable ex) {
+                String msg =
+                    "Could not pass event " +
+                    event.getEventName() +
+                    " to " +
+                    registration.getPlugin().getPluginMeta().getDisplayName();
+                this.server.getLogger().log(Level.SEVERE, msg, ex);
+                if (!(event instanceof ServerExceptionEvent)) {
+                    // We don't want to cause an endless event loop
+                    this.callEvent(
+                        new ServerExceptionEvent(
+                            new ServerEventException(
+                                msg,
+                                ex,
+                                registration.getPlugin(),
+                                registration.getListener(),
+                                event
+                            )
+                        )
+                    );
+                }
+            }
+        }
+    }
+
+    public void registerEvents(
+        @NotNull Listener listener,
+        @NotNull Plugin plugin
+    ) {
+        if (!plugin.isEnabled()) {
+            throw new IllegalPluginAccessException(
+                "Plugin attempted to register " +
+                    listener +
+                    " while not enabled"
+            );
+        }
+
+        for (Map.Entry<
+            Class<? extends Event>,
+            Set<RegisteredListener>
+        > entry : this.createRegisteredListeners(listener, plugin).entrySet()) {
+            this.getEventListeners(
+                this.getRegistrationClass(entry.getKey())
+            ).registerAll(entry.getValue());
+        }
+    }
+
+    @NotNull
+    private HandlerList getEventListeners(
+        @NotNull Class<? extends Event> type
+    ) {
+        try {
+            Method method = this.getRegistrationClass(type).getDeclaredMethod(
+                "getHandlerList"
+            );
+            method.setAccessible(true);
+            return (HandlerList) method.invoke(null);
+        } catch (Exception e) {
+            throw new IllegalPluginAccessException(e.toString());
+        }
+    }
+
+    @NotNull
+    private Class<? extends Event> getRegistrationClass(
+        @NotNull Class<? extends Event> clazz
+    ) {
+        try {
+            clazz.getDeclaredMethod("getHandlerList");
+            return clazz;
+        } catch (NoSuchMethodException e) {
+            if (
+                clazz.getSuperclass() != null &&
+                !clazz.getSuperclass().equals(Event.class) &&
+                Event.class.isAssignableFrom(clazz.getSuperclass())
+            ) {
+                return this.getRegistrationClass(
+                    clazz.getSuperclass().asSubclass(Event.class)
+                );
+            } else {
+                throw new IllegalPluginAccessException(
+                    "Unable to find handler list for event " +
+                        clazz.getName() +
+                        ". Static getHandlerList method required!"
+                );
+            }
+        }
+    }
+
+    public void registerEvent(
+        @NotNull Class<? extends Event> event,
+        @NotNull Listener listener,
+        @NotNull EventPriority priority,
+        @NotNull EventExecutor executor,
+        @NotNull Plugin plugin
+    ) {
+        this.registerEvent(event, listener, priority, executor, plugin, false);
+    }
+
+    public void registerEvent(
+        @NotNull Class<? extends Event> event,
+        @NotNull Listener listener,
+        @NotNull EventPriority priority,
+        @NotNull EventExecutor executor,
+        @NotNull Plugin plugin,
+        boolean ignoreCancelled
+    ) {
+        if (!plugin.isEnabled()) {
+            throw new IllegalPluginAccessException(
+                "Plugin attempted to register " + event + " while not enabled"
+            );
+        }
+
+        executor = new TimedEventExecutor(executor, plugin, null, event);
+        this.getEventListeners(event).register(
+            new RegisteredListener(
+                listener,
+                executor,
+                priority,
+                plugin,
+                ignoreCancelled
+            )
+        );
+    }
+
+    @NotNull
+    public Map<
+        Class<? extends Event>,
+        Set<RegisteredListener>
+    > createRegisteredListeners(
+        @NotNull Listener listener,
+        @NotNull final Plugin plugin
+    ) {
+        Map<Class<? extends Event>, Set<RegisteredListener>> ret =
+            new HashMap<>();
+
+        Set<Method> methods;
+        try {
+            Class<?> listenerClazz = listener.getClass();
+            methods = Sets.union(
+                Set.of(listenerClazz.getMethods()),
+                Set.of(listenerClazz.getDeclaredMethods())
+            );
+        } catch (NoClassDefFoundError e) {
+            plugin
+                .getLogger()
+                .severe(
+                    "Failed to register events for " +
+                        listener.getClass() +
+                        " because " +
+                        e.getMessage() +
+                        " does not exist."
+                );
+            return ret;
+        }
+
+        for (final Method method : methods) {
+            final EventHandler eh = method.getAnnotation(EventHandler.class);
+            if (eh == null) continue;
+            // Do not register bridge or synthetic methods to avoid event duplication
+            // Fixes SPIGOT-893
+            if (method.isBridge() || method.isSynthetic()) {
+                continue;
+            }
+            final Class<?> checkClass;
+            if (
+                method.getParameterTypes().length != 1 ||
+                !Event.class.isAssignableFrom(
+                    checkClass = method.getParameterTypes()[0]
+                )
+            ) {
+                plugin
+                    .getLogger()
+                    .severe(
+                        plugin.getPluginMeta().getDisplayName() +
+                            " attempted to register an invalid EventHandler method signature \"" +
+                            method.toGenericString() +
+                            "\" in " +
+                            listener.getClass()
+                    );
+                continue;
+            }
+            final Class<? extends Event> eventClass = checkClass.asSubclass(
+                Event.class
+            );
+            method.setAccessible(true);
+            Set<RegisteredListener> eventSet = ret.computeIfAbsent(
+                eventClass,
+                k -> new HashSet<>()
+            );
+
+            for (
+                Class<?> clazz = eventClass;
+                Event.class.isAssignableFrom(clazz);
+                clazz = clazz.getSuperclass()
+            ) {
+                // This loop checks for extending deprecated events
+                if (clazz.getAnnotation(Deprecated.class) != null) {
+                    Warning warning = clazz.getAnnotation(Warning.class);
+                    Warning.WarningState warningState =
+                        this.server.getWarningState();
+                    if (!warningState.printFor(warning)) {
+                        break;
+                    }
+                    plugin
+                        .getLogger()
+                        .log(
+                            Level.WARNING,
+                            String.format(
+                                "\"%s\" has registered a listener for %s on method \"%s\", but the event is Deprecated. \"%s\"; please notify the authors %s.",
+                                plugin.getPluginMeta().getDisplayName(),
+                                clazz.getName(),
+                                method.toGenericString(),
+                                (warning != null &&
+                                    warning.reason().length() != 0)
+                                    ? warning.reason()
+                                    : "Server performance will be affected",
+                                Arrays.toString(
+                                    plugin
+                                        .getPluginMeta()
+                                        .getAuthors()
+                                        .toArray()
+                                )
+                            ),
+                            warningState == Warning.WarningState.ON
+                                ? new AuthorNagException(null)
+                                : null
+                        );
+                    break;
+                }
+            }
+
+            EventExecutor executor = new TimedEventExecutor(
+                EventExecutor.create(method, eventClass),
+                plugin,
+                method,
+                eventClass
+            );
+            eventSet.add(
+                new RegisteredListener(
+                    listener,
+                    executor,
+                    eh.priority(),
+                    plugin,
+                    eh.ignoreCancelled()
+                )
+            );
+        }
+        return ret;
+    }
+}

java/patchbukkit/src/main/java/org/patchbukkit/PatchBukkitPluginLoader.java

@@ -81,8 +81,8 @@ public class PatchBukkitPluginLoader implements PluginLoader {
         Class<? extends Event>,
         Set<RegisteredListener>
     > createRegisteredListeners(Listener listener, Plugin plugin) {
-        // TODO: Implement event listener registration when event system is needed
+        throw new UnsupportedOperationException(
-        // For now, return empty map - plugins won't be able to register events
+            "Unimplemented method 'createRegisteredListeners'"
-        return Map.of();
+        );
     }
 }

java/patchbukkit/src/main/java/org/patchbukkit/PatchBukkitPluginManager.java

@@ -5,6 +5,7 @@ import io.papermc.paper.plugin.configuration.PluginMeta;
 import java.io.File;
 import java.util.List;
 import java.util.Set;
+import org.bukkit.Server;
 import org.bukkit.event.Event;
 import org.bukkit.event.EventPriority;
 import org.bukkit.event.Listener;
@@ -18,6 +19,12 @@ import org.jspecify.annotations.NonNull;
 @SuppressWarnings("removal")
 public class PatchBukkitPluginManager implements PluginManager {
 
+    final PatchBukkitEventManager patchBukkitEventManager;
+
+    public PatchBukkitPluginManager(Server server) {
+        this.patchBukkitEventManager = new PatchBukkitEventManager(server);
+    }
+
     @Override
     public void registerInterface(@NotNull Class<? extends PluginLoader> loader)
         throws IllegalArgumentException {}
@@ -88,9 +95,7 @@ public class PatchBukkitPluginManager implements PluginManager {
 
     @Override
     public void callEvent(@NotNull Event event) throws IllegalStateException {
-        throw new UnsupportedOperationException(
+        this.patchBukkitEventManager.callEvent(event);
-            "Unimplemented method 'callEvent'"
-        );
     }
 
     @Override
@@ -98,7 +103,7 @@ public class PatchBukkitPluginManager implements PluginManager {
         @NotNull Listener listener,
         @NotNull Plugin plugin
     ) {
-        NativeCallbacks.getInstance().registerEventCallback(listener, plugin);
+        this.patchBukkitEventManager.registerEvents(listener, plugin);
     }
 
     @Override
@@ -109,8 +114,12 @@ public class PatchBukkitPluginManager implements PluginManager {
         @NotNull EventExecutor executor,
         @NotNull Plugin plugin
     ) {
-        throw new UnsupportedOperationException(
+        this.patchBukkitEventManager.registerEvent(
-            "Unimplemented method 'registerEvent'"
+            event,
+            listener,
+            priority,
+            executor,
+            plugin
         );
     }
 
@@ -123,8 +132,13 @@ public class PatchBukkitPluginManager implements PluginManager {
         @NotNull Plugin plugin,
         boolean ignoreCancelled
     ) {
-        throw new UnsupportedOperationException(
+        this.patchBukkitEventManager.registerEvent(
-            "Unimplemented method 'registerEvent'"
+            event,
+            listener,
+            priority,
+            executor,
+            plugin,
+            ignoreCancelled
         );
     }
 

java/patchbukkit/src/main/java/org/patchbukkit/PatchBukkitServer.java

@@ -443,7 +443,7 @@ public class PatchBukkitServer implements Server {
 
     @Override
     public @NotNull PluginManager getPluginManager() {
-        return new PatchBukkitPluginManager();
+        return new PatchBukkitPluginManager(this);
     }
 
     @Override

rust/src/events/join.rs

@@ -5,10 +5,9 @@ use pumpkin::{
     server::Server,
 };
 use pumpkin_api_macros::with_runtime;
-use pumpkin_util::text::{TextComponent, color::NamedColor};
+use tokio::sync::{mpsc, oneshot};
-use tokio::sync::mpsc;
 
-use crate::java::jvm::commands::JvmCommand;
+use crate::{events::Event, java::jvm::commands::JvmCommand};
 
 pub struct PatchBukkitJoinHandler {
     pub command_tx: mpsc::Sender<JvmCommand>,
@@ -21,11 +20,22 @@ impl EventHandler<PlayerJoinEvent> for PatchBukkitJoinHandler {
         _server: &Arc<Server>,
         event: &'a mut PlayerJoinEvent,
     ) -> BoxFuture<'a, ()> {
-        Box::pin(async {
+        let event: &mut PlayerJoinEvent = event;
-            // for (_plugin_name, plugin) in self.plugins.lock().unwrap().iter_mut() {}
+
-            event.join_message =
+        let (tx, rx) = oneshot::channel();
-                TextComponent::text(format!("Welcome, {}!", event.player.gameprofile.name))
+        let sent_event = event.clone();
-                    .color_named(NamedColor::Green);
+        self.command_tx
-        })
+            .blocking_send(JvmCommand::TriggerEvent {
+                event: Event::PlayerJoinEvent(sent_event),
+                respond_to: tx,
+            })
+            .unwrap();
+
+        match rx.await.unwrap().unwrap() {
+            Event::PlayerJoinEvent(player_join_event) => *event = player_join_event,
+            _ => unreachable!(),
+        };
+
+        Box::pin(async {})
     }
 }

rust/src/events/mod.rs

@@ -1,12 +1,16 @@
 use std::sync::Arc;
 
-use pumpkin::plugin::{Context, EventPriority};
+use pumpkin::plugin::{Context, EventPriority, player::player_join::PlayerJoinEvent};
 use tokio::sync::mpsc;
 
 use crate::{events::join::PatchBukkitJoinHandler, java::jvm::commands::JvmCommand};
 
 pub mod join;
 
+pub enum Event {
+    PlayerJoinEvent(PlayerJoinEvent),
+}
+
 pub async fn register_handlers(command_tx: mpsc::Sender<JvmCommand>, server: &Arc<Context>) {
     server
         .register_event(

rust/src/java/jvm/commands.rs

@@ -4,6 +4,8 @@ use anyhow::Result;
 use j4rs::Instance;
 use tokio::sync::oneshot;
 
+use crate::events::Event;
+
 pub enum LoadPluginResult {
     SuccessfullyLoadedSpigot,
     SuccessfullyLoadedPaper,
@@ -38,4 +40,8 @@ pub enum JvmCommand {
     Shutdown {
         respond_to: oneshot::Sender<Result<()>>,
     },
+    TriggerEvent {
+        event: Event,
+        respond_to: oneshot::Sender<Result<Event>>,
+    },
 }

rust/src/java/jvm/worker.rs

@@ -2,20 +2,23 @@ use std::path::PathBuf;
 
 use anyhow::bail;
 use j4rs::{Instance, InvocationArg, Jvm, JvmBuilder};
+use pumpkin::plugin::player::player_join::PlayerJoinEvent;
 use tokio::sync::{mpsc, oneshot};
 
 use crate::{
+    events::Event,
     java::{
         jar::read_configs_from_jar,
         jvm::commands::{JvmCommand, LoadPluginResult},
     },
-    plugin::manager::PluginManager,
+    plugin::{event_manager::EventManager, manager::PluginManager},
 };
 
 pub struct JvmWorker {
     command_rx: mpsc::Receiver<JvmCommand>,
     command_tx: mpsc::Sender<JvmCommand>,
     pub plugin_manager: PluginManager,
+    pub event_manager: EventManager,
     jvm: Option<j4rs::Jvm>,
 }
 
@@ -28,6 +31,7 @@ impl JvmWorker {
             command_rx,
             command_tx,
             plugin_manager: PluginManager::new(),
+            event_manager: EventManager::new(),
             jvm: None,
         }
     }
@@ -117,6 +121,19 @@ impl JvmWorker {
                     let _ = respond_to.send(self.plugin_manager.unload_all_plugins());
                     break;
                 }
+                JvmCommand::TriggerEvent { event, respond_to } => {
+                    let jvm = match self.jvm {
+                        Some(ref jvm) => jvm,
+                        None => &Jvm::attach_thread().unwrap(),
+                    };
+
+                    match event {
+                        Event::PlayerJoinEvent(player_join_event) => {
+                            // let player = jvm.create_instance("org.bukkit.entity.Player", &[]);
+                            // self.event_manager.call_event(&jvm, event)
+                        }
+                    }
+                }
             }
         }
 

rust/src/plugin/event_manager.rs

@@ -0,0 +1,21 @@
+use anyhow::Result;
+use j4rs::{Instance, InvocationArg, Jvm};
+
+pub struct EventManager {}
+
+impl EventManager {
+    pub fn new() -> Self {
+        Self {}
+    }
+
+    pub fn call_event(&self, jvm: &Jvm, event: Instance) -> Result<()> {
+        let server = jvm.invoke_static("org.bukkit.Bukkit", "getServer", InvocationArg::empty())?;
+        let plugin_manager = jvm.invoke(&server, "getPluginManager", InvocationArg::empty())?;
+        jvm.invoke(
+            &plugin_manager,
+            "callEvent",
+            &[InvocationArg::try_from(event)?],
+        )?;
+        Ok(())
+    }
+}

rust/src/plugin/mod.rs

@@ -1 +1,2 @@
+pub mod event_manager;
 pub mod manager;