Replace all ConnectionCallbacks with Event api, add EventInvokerCallback

src/main/java/de/bixilon/minosoft/gui/main/ServerListCell.java

@@ -20,6 +20,9 @@ import de.bixilon.minosoft.data.locale.Strings;
 import de.bixilon.minosoft.data.mappings.versions.Version;
 import de.bixilon.minosoft.data.mappings.versions.Versions;
 import de.bixilon.minosoft.logging.Log;
+import de.bixilon.minosoft.modding.event.EventInvokerCallback;
+import de.bixilon.minosoft.modding.event.events.ConnectionStateChangeEvent;
+import de.bixilon.minosoft.modding.event.events.ServerListPingArriveEvent;
 import de.bixilon.minosoft.protocol.network.Connection;
 import de.bixilon.minosoft.protocol.ping.ForgeModInfo;
 import de.bixilon.minosoft.protocol.ping.ServerListPing;
@@ -134,7 +137,8 @@ public class ServerListCell extends ListCell<Server> implements Initializable {
         if (server.getLastPing() == null) {
             server.ping();
         }
-        server.getLastPing().addPingCallback(ping -> Platform.runLater(() -> {
+        server.getLastPing().registerEvent(new EventInvokerCallback<ServerListPingArriveEvent>(ServerListPingArriveEvent.class, event -> Platform.runLater(() -> {
+            ServerListPing ping = event.getServerListPing();
             if (server != this.server) {
                 // cell does not contains us anymore
                 return;
@@ -193,7 +197,7 @@ public class ServerListCell extends ListCell<Server> implements Initializable {
                 canConnect = false;
                 setErrorMotd(String.format("%s: %s", server.getLastPing().getLastConnectionException().getClass().getCanonicalName(), server.getLastPing().getLastConnectionException().getLocalizedMessage()));
             }
-        }));
+        })));
     }
 
     private void resetCell() {
@@ -265,7 +269,7 @@ public class ServerListCell extends ListCell<Server> implements Initializable {
         }
         optionsConnect.setDisable(true);
         connection.connect(server.getLastPing().getAddress(), version);
-        connection.addConnectionChangeCallback(this::handleConnectionCallback);
+        connection.registerEvent(new EventInvokerCallback<>(this::handleConnectionCallback));
         server.addConnection(connection);
 
     }
@@ -334,7 +338,8 @@ public class ServerListCell extends ListCell<Server> implements Initializable {
         dialog.showAndWait();
     }
 
-    private void handleConnectionCallback(Connection connection) {
+    private void handleConnectionCallback(ConnectionStateChangeEvent event) {
+        Connection connection = event.getConnection();
         if (!server.getConnections().contains(connection)) {
             // the card got recycled
             return;

src/main/java/de/bixilon/minosoft/gui/main/SessionListCell.java

@@ -15,6 +15,8 @@ package de.bixilon.minosoft.gui.main;
 
 import de.bixilon.minosoft.data.locale.LocaleManager;
 import de.bixilon.minosoft.data.locale.Strings;
+import de.bixilon.minosoft.modding.event.EventInvokerCallback;
+import de.bixilon.minosoft.modding.event.events.ConnectionStateChangeEvent;
 import de.bixilon.minosoft.protocol.network.Connection;
 import javafx.application.Platform;
 import javafx.fxml.FXMLLoader;
@@ -81,12 +83,13 @@ public class SessionListCell extends ListCell<Connection> implements Initializab
         }
         setStyle(null);
         this.connection = connection;
-        connection.addConnectionChangeCallback(this::handleConnectionCallback);
+        connection.registerEvent(new EventInvokerCallback<>(this::handleConnectionCallback));
         connectionId.setText(String.format("#%d", connection.getConnectionId()));
         account.setText(connection.getPlayer().getAccount().getPlayerName());
     }
 
-    private void handleConnectionCallback(Connection connection) {
+    private void handleConnectionCallback(ConnectionStateChangeEvent event) {
+        Connection connection = event.getConnection();
         if (this.connection != connection) {
             // the card got recycled
             return;

src/main/java/de/bixilon/minosoft/modding/event/EventInvoker.java

@@ -0,0 +1,41 @@
+/*
+ * Minosoft
+ * Copyright (C) 2020 Moritz Zwerger
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.If not, see <https://www.gnu.org/licenses/>.
+ *
+ * This software is not affiliated with Mojang AB, the original developer of Minecraft.
+ */
+
+package de.bixilon.minosoft.modding.event;
+
+import de.bixilon.minosoft.modding.event.events.ConnectionEvent;
+import de.bixilon.minosoft.modding.loading.Priorities;
+
+public abstract class EventInvoker {
+    protected final EventListener listener;
+    protected final boolean ignoreCancelled;
+    protected final Priorities priority;
+
+    public EventInvoker(boolean ignoreCancelled, Priorities priority, EventListener listener) {
+        this.ignoreCancelled = ignoreCancelled;
+        this.listener = listener;
+        this.priority = priority;
+    }
+
+    public boolean isIgnoreCancelled() {
+        return ignoreCancelled;
+    }
+
+    public Priorities getPriority() {
+        return priority;
+    }
+
+    public abstract void invoke(ConnectionEvent event);
+
+    public abstract Class<? extends ConnectionEvent> getEventType();
+}

src/main/java/de/bixilon/minosoft/modding/event/EventInvokerCallback.java

@@ -0,0 +1,54 @@
+/*
+ * Minosoft
+ * Copyright (C) 2020 Moritz Zwerger
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.If not, see <https://www.gnu.org/licenses/>.
+ *
+ * This software is not affiliated with Mojang AB, the original developer of Minecraft.
+ */
+
+package de.bixilon.minosoft.modding.event;
+
+import de.bixilon.minosoft.modding.event.events.ConnectionEvent;
+import de.bixilon.minosoft.modding.loading.Priorities;
+
+public class EventInvokerCallback<V extends ConnectionEvent> extends EventInvoker {
+    private final InvokerCallback<V> callback;
+
+    Class<? extends ConnectionEvent> eventType = ConnectionEvent.class;
+
+    public EventInvokerCallback(boolean ignoreCancelled, InvokerCallback<V> callback) {
+        super(ignoreCancelled, Priorities.NORMAL, null);
+        this.callback = callback;
+    }
+
+
+    // if you need instant fireing support
+    public EventInvokerCallback(Class<? extends ConnectionEvent> eventType, InvokerCallback<V> callback) {
+        this(false, callback);
+        this.eventType = eventType; // ToDo: how to get the class of V? seems to be impossible
+    }
+
+    public EventInvokerCallback(InvokerCallback<V> callback) {
+        this(false, callback);
+    }
+
+    public void invoke(ConnectionEvent event) {
+        if (eventType != event.getClass()) {
+            return;
+        }
+        callback.handle((V) event);
+    }
+
+    public Class<? extends ConnectionEvent> getEventType() {
+        return eventType;
+    }
+
+    public interface InvokerCallback<V> {
+        void handle(V event);
+    }
+}

src/main/java/de/bixilon/minosoft/modding/event/EventInvokerMethod.java

@@ -16,23 +16,23 @@ package de.bixilon.minosoft.modding.event;
 import de.bixilon.minosoft.modding.event.events.CancelableEvent;
 import de.bixilon.minosoft.modding.event.events.ConnectionEvent;
 import de.bixilon.minosoft.modding.event.events.annotations.EventHandler;
+import de.bixilon.minosoft.modding.loading.Priorities;
 
 import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Method;
 
-public class EventMethod {
-    private final EventHandler annotation;
-    private final EventListener listener;
+public class EventInvokerMethod extends EventInvoker {
     private final Method method;
+    private final Class<? extends ConnectionEvent> eventType;
 
-    public EventMethod(EventHandler annotation, EventListener listener, Method method) {
-        this.annotation = annotation;
-        this.listener = listener;
+    public EventInvokerMethod(boolean ignoreCancelled, Priorities priority, EventListener listener, Method method) {
+        super(ignoreCancelled, priority, listener);
         this.method = method;
+        eventType = (Class<? extends ConnectionEvent>) method.getParameters()[0].getType();
     }
 
-    public EventHandler getAnnotation() {
-        return annotation;
+    public EventInvokerMethod(EventHandler annotation, EventListener listener, Method method) {
+        this(annotation.ignoreCancelled(), annotation.priority(), listener, method);
     }
 
     public Method getMethod() {
@@ -43,7 +43,7 @@ public class EventMethod {
         if (!method.getParameters()[0].getType().isAssignableFrom(event.getClass())) {
             return;
         }
-        if (!annotation.ignoreCancelled() && event instanceof CancelableEvent cancelableEvent && cancelableEvent.isCancelled()) {
+        if (!ignoreCancelled && event instanceof CancelableEvent cancelableEvent && cancelableEvent.isCancelled()) {
             return;
         }
         try {
@@ -52,4 +52,8 @@ public class EventMethod {
             e.printStackTrace();
         }
     }
+
+    public Class<? extends ConnectionEvent> getEventType() {
+        return eventType;
+    }
 }

src/main/java/de/bixilon/minosoft/modding/event/EventManager.java

@@ -23,16 +23,16 @@ import java.util.HashMap;
 import java.util.HashSet;
 
 public class EventManager {
-    private final HashSet<EventMethod> globalEventListeners = new HashSet<>();
-    private final HashMap<HashSet<ServerAddressValidator>, HashSet<EventMethod>> specificEventListeners = new HashMap<>();
+    private final HashSet<EventInvoker> globalEventListeners = new HashSet<>();
+    private final HashMap<HashSet<ServerAddressValidator>, HashSet<EventInvoker>> specificEventListeners = new HashMap<>();
 
     public void registerGlobalListener(EventListener listener) {
         globalEventListeners.addAll(getEventMethods(listener));
     }
 
-    private HashSet<EventMethod> getEventMethods(EventListener listener) {
+    private HashSet<EventInvoker> getEventMethods(EventListener listener) {
         Class<? extends EventListener> clazz = listener.getClass();
-        HashSet<EventMethod> eventMethods = new HashSet<>();
+        HashSet<EventInvoker> eventInvokers = new HashSet<>();
         for (Method method : clazz.getMethods()) {
             EventHandler annotation = method.getAnnotation(EventHandler.class);
             if (annotation == null) {
@@ -44,12 +44,12 @@ public class EventManager {
             if (!ConnectionEvent.class.isAssignableFrom(method.getParameters()[0].getType())) {
                 continue;
             }
-            eventMethods.add(new EventMethod(annotation, listener, method));
+            eventInvokers.add(new EventInvokerMethod(annotation, listener, method));
         }
-        return eventMethods;
+        return eventInvokers;
     }
 
-    public HashSet<EventMethod> getGlobalEventListeners() {
+    public HashSet<EventInvoker> getGlobalEventListeners() {
         return globalEventListeners;
     }
 
@@ -61,7 +61,7 @@ public class EventManager {
         specificEventListeners.put(serverAddresses, getEventMethods(listener));
     }
 
-    public HashMap<HashSet<ServerAddressValidator>, HashSet<EventMethod>> getSpecificEventListeners() {
+    public HashMap<HashSet<ServerAddressValidator>, HashSet<EventInvoker>> getSpecificEventListeners() {
         return specificEventListeners;
     }
 }

src/main/java/de/bixilon/minosoft/modding/event/events/ConnectionStateChangeEvent.java

@@ -0,0 +1,41 @@
+/*
+ * Minosoft
+ * Copyright (C) 2020 Moritz Zwerger
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.If not, see <https://www.gnu.org/licenses/>.
+ *
+ * This software is not affiliated with Mojang AB, the original developer of Minecraft.
+ */
+
+package de.bixilon.minosoft.modding.event.events;
+
+import de.bixilon.minosoft.modding.event.events.annotations.Unsafe;
+import de.bixilon.minosoft.protocol.network.Connection;
+import de.bixilon.minosoft.protocol.protocol.ConnectionStates;
+
+/**
+ * Fired when the connection state was just changed
+ */
+@Unsafe
+public class ConnectionStateChangeEvent extends ConnectionEvent {
+    private final ConnectionStates previousState;
+    private final ConnectionStates currentState;
+
+    public ConnectionStateChangeEvent(Connection connection, ConnectionStates previousState, ConnectionStates currentState) {
+        super(connection);
+        this.previousState = previousState;
+        this.currentState = currentState;
+    }
+
+    public ConnectionStates getPreviousState() {
+        return previousState;
+    }
+
+    public ConnectionStates getCurrentState() {
+        return currentState;
+    }
+}

src/main/java/de/bixilon/minosoft/modding/event/events/ServerListPingArriveEvent.java

@@ -11,10 +11,26 @@
  * This software is not affiliated with Mojang AB, the original developer of Minecraft.
  */
 
-package de.bixilon.minosoft.gui.main;
+package de.bixilon.minosoft.modding.event.events;
 
 import de.bixilon.minosoft.protocol.network.Connection;
+import de.bixilon.minosoft.protocol.ping.ServerListPing;
 
-public interface ConnectionChangeCallback {
-    void handle(Connection connection);
+import javax.annotation.Nullable;
+
+/**
+ * Fired when a ping arrives from the server or the ping already arrived and the event got registered to late
+ */
+public class ServerListPingArriveEvent extends ConnectionEvent {
+    private final ServerListPing serverListPing;
+
+    public ServerListPingArriveEvent(Connection connection, ServerListPing serverListPing) {
+        super(connection);
+        this.serverListPing = serverListPing;
+    }
+
+    @Nullable
+    public ServerListPing getServerListPing() {
+        return serverListPing;
+    }
 }

src/main/java/de/bixilon/minosoft/modding/event/events/annotations/Unsafe.java

@@ -13,5 +13,9 @@
 
 package de.bixilon.minosoft.modding.event.events.annotations;
 
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+
+@Retention(RetentionPolicy.RUNTIME)
 public @interface Unsafe {
 }

src/main/java/de/bixilon/minosoft/protocol/network/Connection.java

@@ -21,21 +21,16 @@ import de.bixilon.minosoft.data.mappings.recipes.Recipes;
 import de.bixilon.minosoft.data.mappings.versions.Version;
 import de.bixilon.minosoft.data.mappings.versions.VersionMapping;
 import de.bixilon.minosoft.data.mappings.versions.Versions;
-import de.bixilon.minosoft.gui.main.ConnectionChangeCallback;
 import de.bixilon.minosoft.logging.Log;
 import de.bixilon.minosoft.logging.LogLevels;
-import de.bixilon.minosoft.modding.event.EventMethod;
-import de.bixilon.minosoft.modding.event.events.CancelableEvent;
-import de.bixilon.minosoft.modding.event.events.ConnectionEvent;
-import de.bixilon.minosoft.modding.event.events.PacketReceiveEvent;
-import de.bixilon.minosoft.modding.event.events.PacketSendEvent;
+import de.bixilon.minosoft.modding.event.EventInvoker;
+import de.bixilon.minosoft.modding.event.events.*;
 import de.bixilon.minosoft.protocol.packets.ClientboundPacket;
 import de.bixilon.minosoft.protocol.packets.ServerboundPacket;
 import de.bixilon.minosoft.protocol.packets.serverbound.handshaking.PacketHandshake;
 import de.bixilon.minosoft.protocol.packets.serverbound.login.PacketLoginStart;
 import de.bixilon.minosoft.protocol.packets.serverbound.status.PacketStatusPing;
 import de.bixilon.minosoft.protocol.packets.serverbound.status.PacketStatusRequest;
-import de.bixilon.minosoft.protocol.ping.PingCallback;
 import de.bixilon.minosoft.protocol.ping.ServerListPing;
 import de.bixilon.minosoft.protocol.protocol.*;
 import de.bixilon.minosoft.util.DNSUtil;
@@ -43,7 +38,6 @@ import de.bixilon.minosoft.util.ServerAddress;
 import org.xbill.DNS.TextParseException;
 
 import javax.annotation.Nullable;
-import java.util.HashSet;
 import java.util.LinkedList;
 import java.util.concurrent.LinkedBlockingQueue;
 import java.util.concurrent.atomic.AtomicBoolean;
@@ -55,9 +49,7 @@ public class Connection {
     final PacketSender sender = new PacketSender(this);
     final LinkedBlockingQueue<ClientboundPacket> handlingQueue = new LinkedBlockingQueue<>();
     final VelocityHandler velocityHandler = new VelocityHandler(this);
-    final HashSet<PingCallback> pingCallbacks = new HashSet<>();
-    final HashSet<ConnectionChangeCallback> connectionChangeCallbacks = new HashSet<>();
-    final LinkedList<EventMethod> eventListeners = new LinkedList<>();
+    final LinkedList<EventInvoker> eventListeners = new LinkedList<>();
     final int connectionId;
     final Player player;
     final String hostname;
@@ -282,15 +274,6 @@ public class Connection {
         return connectionId;
     }
 
-    public void addPingCallback(PingCallback callback) {
-        if (getConnectionState() == ConnectionStates.FAILED || getConnectionState() == ConnectionStates.FAILED_NO_RETRY || lastPing != null) {
-            // ping done
-            callback.handle(lastPing);
-            return;
-        }
-        pingCallbacks.add(callback);
-    }
-
     public ConnectionStates getConnectionState() {
         return state;
     }
@@ -320,7 +303,7 @@ public class Connection {
                     if (a == null || b == null) {
                         return 0;
                     }
-                    return -(b.getAnnotation().priority().ordinal() - a.getAnnotation().priority().ordinal());
+                    return -(b.getPriority().ordinal() - a.getPriority().ordinal());
                 });
                 // connection established, starting threads and logging in
                 startHandlingThread();
@@ -370,11 +353,7 @@ public class Connection {
             case FAILED_NO_RETRY -> handlePingCallbacks(null);
         }
         // handle callbacks
-        connectionChangeCallbacks.forEach((callback -> callback.handle(this)));
-    }
-
-    public HashSet<PingCallback> getPingCallbacks() {
-        return pingCallbacks;
+        fireEvent(new ConnectionStateChangeEvent(this, previousState, state));
     }
 
     public int getDesiredVersionNumber() {
@@ -387,21 +366,23 @@ public class Connection {
 
     public void handlePingCallbacks(@Nullable ServerListPing ping) {
         this.lastPing = ping;
-        pingCallbacks.forEach((callback -> callback.handle(ping)));
+        fireEvent(new ServerListPingArriveEvent(this, ping));
+    }
+
+    public void registerEvent(EventInvoker method) {
+        eventListeners.add(method);
+        if (method.getEventType() == ServerListPingArriveEvent.class) {
+            if (getConnectionState() == ConnectionStates.FAILED || getConnectionState() == ConnectionStates.FAILED_NO_RETRY || lastPing != null) {
+                // ping done
+                method.invoke(new ServerListPingArriveEvent(this, lastPing));
+            }
+        }
     }
 
     public Exception getLastConnectionException() {
         return (lastException != null) ? lastException : network.getLastException();
     }
 
-    public void addConnectionChangeCallback(ConnectionChangeCallback callback) {
-        connectionChangeCallbacks.add(callback);
-    }
-
-    public HashSet<ConnectionChangeCallback> getConnectionChangeCallbacks() {
-        return connectionChangeCallbacks;
-    }
-
     public ServerListPing getLastPing() {
         return lastPing;
     }

src/main/java/de/bixilon/minosoft/protocol/ping/PingCallback.java

@@ -1,18 +0,0 @@
-/*
- * Minosoft
- * Copyright (C) 2020 Moritz Zwerger
- *
- * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along with this program.If not, see <https://www.gnu.org/licenses/>.
- *
- * This software is not affiliated with Mojang AB, the original developer of Minecraft.
- */
-
-package de.bixilon.minosoft.protocol.ping;
-
-public interface PingCallback {
-    void handle(ServerListPing ping);
-}