Port thread safety/performance optimizations from #1992

src/main/java/fr/xephi/authme/command/executable/authme/AccountsCommand.java

@@ -32,40 +32,34 @@ public class AccountsCommand implements ExecutableCommand {
 
         // Assumption: a player name cannot contain '.'
         if (playerName.contains(".")) {
-            bukkitService.runTaskAsynchronously(new Runnable() {
-                @Override
-                public void run() {
-                    List<String> accountList = dataSource.getAllAuthsByIp(playerName);
-                    if (accountList.isEmpty()) {
-                        sender.sendMessage("[AuthMe] This IP does not exist in the database.");
-                    } else if (accountList.size() == 1) {
-                        sender.sendMessage("[AuthMe] " + playerName + " is a single account player");
-                    } else {
-                        outputAccountsList(sender, playerName, accountList);
-                    }
+            bukkitService.runTaskAsynchronously(() -> {
+                List<String> accountList = dataSource.getAllAuthsByIp(playerName);
+                if (accountList.isEmpty()) {
+                    sender.sendMessage("[AuthMe] This IP does not exist in the database.");
+                } else if (accountList.size() == 1) {
+                    sender.sendMessage("[AuthMe] " + playerName + " is a single account player");
+                } else {
+                    outputAccountsList(sender, playerName, accountList);
                 }
             });
         } else {
-            bukkitService.runTaskAsynchronously(new Runnable() {
-                @Override
-                public void run() {
-                    PlayerAuth auth = dataSource.getAuth(playerName.toLowerCase());
-                    if (auth == null) {
-                        commonService.send(sender, MessageKey.UNKNOWN_USER);
-                        return;
-                    } else if (auth.getLastIp() == null) {
-                        sender.sendMessage("No known last IP address for player");
-                        return;
-                    }
+            bukkitService.runTaskAsynchronously(() -> {
+                PlayerAuth auth = dataSource.getAuth(playerName.toLowerCase());
+                if (auth == null) {
+                    commonService.send(sender, MessageKey.UNKNOWN_USER);
+                    return;
+                } else if (auth.getLastIp() == null) {
+                    sender.sendMessage("No known last IP address for player");
+                    return;
+                }
 
-                    List<String> accountList = dataSource.getAllAuthsByIp(auth.getLastIp());
-                    if (accountList.isEmpty()) {
-                        commonService.send(sender, MessageKey.UNKNOWN_USER);
-                    } else if (accountList.size() == 1) {
-                        sender.sendMessage("[AuthMe] " + playerName + " is a single account player");
-                    } else {
-                        outputAccountsList(sender, playerName, accountList);
-                    }
+                List<String> accountList = dataSource.getAllAuthsByIp(auth.getLastIp());
+                if (accountList.isEmpty()) {
+                    commonService.send(sender, MessageKey.UNKNOWN_USER);
+                } else if (accountList.size() == 1) {
+                    sender.sendMessage("[AuthMe] " + playerName + " is a single account player");
+                } else {
+                    outputAccountsList(sender, playerName, accountList);
                 }
             });
         }

src/main/java/fr/xephi/authme/command/executable/authme/ConverterCommand.java

@@ -55,15 +55,12 @@ public class ConverterCommand implements ExecutableCommand {
         final Converter converter = converterFactory.newInstance(converterClass);
 
         // Run the convert job
-        bukkitService.runTaskAsynchronously(new Runnable() {
-            @Override
-            public void run() {
-                try {
-                    converter.execute(sender);
-                } catch (Exception e) {
-                    commonService.send(sender, MessageKey.ERROR);
-                    logger.logException("Error during conversion:", e);
-                }
+        bukkitService.runTaskAsynchronously(() -> {
+            try {
+                converter.execute(sender);
+            } catch (Exception e) {
+                commonService.send(sender, MessageKey.ERROR);
+                logger.logException("Error during conversion:", e);
             }
         });
 

src/main/java/fr/xephi/authme/command/executable/authme/PurgePlayerCommand.java

@@ -29,7 +29,7 @@ public class PurgePlayerCommand implements ExecutableCommand {
     @Override
     public void executeCommand(CommandSender sender, List<String> arguments) {
         String option = arguments.size() > 1 ? arguments.get(1) : null;
-        bukkitService.runTaskOptionallyAsync(
+        bukkitService.runTaskAsynchronously(
             () -> executeCommand(sender, arguments.get(0), option));
     }
 

src/main/java/fr/xephi/authme/initialization/OnStartupTasks.java

@@ -19,6 +19,7 @@ import org.bukkit.Bukkit;
 import org.bukkit.entity.Player;
 
 import javax.inject.Inject;
+import java.util.List;
 import java.util.logging.Logger;
 
 import static fr.xephi.authme.service.BukkitService.TICKS_PER_MINUTE;
@@ -94,12 +95,15 @@ public class OnStartupTasks {
             return;
         }
         bukkitService.runTaskTimerAsynchronously(() -> {
-            for (String playerWithoutMail : dataSource.getLoggedPlayersWithEmptyMail()) {
-                Player player = bukkitService.getPlayerExact(playerWithoutMail);
-                if (player != null) {
-                    messages.send(player, MessageKey.ADD_EMAIL_MESSAGE);
+            List<String> loggedPlayersWithEmptyMail = dataSource.getLoggedPlayersWithEmptyMail();
+            bukkitService.runTask(() -> {
+                for (String playerWithoutMail : loggedPlayersWithEmptyMail) {
+                    Player player = bukkitService.getPlayerExact(playerWithoutMail);
+                    if (player != null) {
+                        messages.send(player, MessageKey.ADD_EMAIL_MESSAGE);
+                    }
                 }
-            }
+            });
         }, 1, TICKS_PER_MINUTE * settings.getProperty(EmailSettings.DELAY_RECALL));
     }
 }

src/main/java/fr/xephi/authme/listener/PlayerListener.java

@@ -112,7 +112,6 @@ public class PlayerListener implements Listener {
 
         // Non-blocking checks
         try {
-            onJoinVerifier.checkSingleSession(name);
             onJoinVerifier.checkIsValidName(name);
         } catch (FailedVerificationException e) {
             event.setKickMessage(messages.retrieveSingle(name, e.getReason(), e.getArgs()));
@@ -161,6 +160,14 @@ public class PlayerListener implements Listener {
         final Player player = event.getPlayer();
         final String name = player.getName();
 
+        try {
+            onJoinVerifier.checkSingleSession(name);
+        } catch (FailedVerificationException e) {
+            event.setKickMessage(messages.retrieveSingle(name, e.getReason(), e.getArgs()));
+            event.setResult(PlayerLoginEvent.Result.KICK_OTHER);
+            return;
+        }
+
         if (validationService.isUnrestricted(name)) {
             return;
         }

src/main/java/fr/xephi/authme/process/login/ProcessSyncPlayerLogin.java

@@ -1,9 +1,9 @@
 package fr.xephi.authme.process.login;
 
 import fr.xephi.authme.data.auth.PlayerAuth;
+import fr.xephi.authme.data.auth.PlayerCache;
 import fr.xephi.authme.data.limbo.LimboPlayer;
 import fr.xephi.authme.data.limbo.LimboService;
-import fr.xephi.authme.datasource.DataSource;
 import fr.xephi.authme.events.LoginEvent;
 import fr.xephi.authme.events.RestoreInventoryEvent;
 import fr.xephi.authme.permission.PermissionsManager;
@@ -40,7 +40,7 @@ public class ProcessSyncPlayerLogin implements SynchronousProcess {
     private TeleportationService teleportationService;
 
     @Inject
-    private DataSource dataSource;
+    private PlayerCache playerCache;
 
     @Inject
     private CommandManager commandManager;
@@ -88,7 +88,7 @@ public class ProcessSyncPlayerLogin implements SynchronousProcess {
             restoreInventory(player);
         }
 
-        final PlayerAuth auth = dataSource.getAuth(name);
+        final PlayerAuth auth = playerCache.getAuth(name);
         teleportationService.teleportOnLogin(player, auth, limbo);
 
         // We can now display the join message (if delayed)

src/main/java/fr/xephi/authme/service/AntiBotService.java

@@ -7,6 +7,7 @@ import fr.xephi.authme.permission.AdminPermission;
 import fr.xephi.authme.permission.PermissionsManager;
 import fr.xephi.authme.settings.Settings;
 import fr.xephi.authme.settings.properties.ProtectionSettings;
+import fr.xephi.authme.util.AtomicIntervalCounter;
 import org.bukkit.scheduler.BukkitTask;
 
 import javax.inject.Inject;
@@ -29,14 +30,11 @@ public class AntiBotService implements SettingsDependent {
     private final CopyOnWriteArrayList<String> antibotKicked = new CopyOnWriteArrayList<>();
     // Settings
     private int duration;
-    private int sensibility;
-    private int interval;
     // Service status
     private AntiBotStatus antiBotStatus;
     private boolean startup;
     private BukkitTask disableTask;
-    private Instant lastFlaggedJoin;
-    private int flagged = 0;
+    private AtomicIntervalCounter flaggedCounter;
 
     @Inject
     AntiBotService(Settings settings, Messages messages, PermissionsManager permissionsManager,
@@ -47,7 +45,6 @@ public class AntiBotService implements SettingsDependent {
         this.bukkitService = bukkitService;
         // Initial status
         disableTask = null;
-        flagged = 0;
         antiBotStatus = AntiBotStatus.DISABLED;
         startup = true;
         // Load settings and start if required
@@ -58,8 +55,9 @@ public class AntiBotService implements SettingsDependent {
     public void reload(Settings settings) {
         // Load settings
         duration = settings.getProperty(ProtectionSettings.ANTIBOT_DURATION);
-        sensibility = settings.getProperty(ProtectionSettings.ANTIBOT_SENSIBILITY);
-        interval = settings.getProperty(ProtectionSettings.ANTIBOT_INTERVAL);
+        int sensibility = settings.getProperty(ProtectionSettings.ANTIBOT_SENSIBILITY);
+        int interval = settings.getProperty(ProtectionSettings.ANTIBOT_INTERVAL);
+        flaggedCounter = new AtomicIntervalCounter(sensibility, interval);
 
         // Stop existing protection
         stopProtection();
@@ -83,19 +81,25 @@ public class AntiBotService implements SettingsDependent {
         }
     }
 
+    /**
+     * Transitions the anti bot service to an active status.
+     */
     private void startProtection() {
-        // Disable existing antibot session
-        stopProtection();
-        // Enable the new session
-        antiBotStatus = AntiBotStatus.ACTIVE;
-
-        // Inform admins
-        bukkitService.getOnlinePlayers().stream()
-            .filter(player -> permissionsManager.hasPermission(player, AdminPermission.ANTIBOT_MESSAGES))
-            .forEach(player -> messages.send(player, MessageKey.ANTIBOT_AUTO_ENABLED_MESSAGE));
-
+        if (antiBotStatus == AntiBotStatus.ACTIVE) {
+            return; // Already activating/active
+        }
+        if (disableTask != null) {
+            disableTask.cancel();
+        }
         // Schedule auto-disable
         disableTask = bukkitService.runTaskLater(this::stopProtection, duration * TICKS_PER_MINUTE);
+        antiBotStatus = AntiBotStatus.ACTIVE;
+        bukkitService.scheduleSyncTaskFromOptionallyAsyncTask(() -> {
+            // Inform admins
+            bukkitService.getOnlinePlayers().stream()
+                .filter(player -> permissionsManager.hasPermission(player, AdminPermission.ANTIBOT_MESSAGES))
+                .forEach(player -> messages.send(player, MessageKey.ANTIBOT_AUTO_ENABLED_MESSAGE));
+        });
     }
 
     /**
@@ -108,7 +112,7 @@ public class AntiBotService implements SettingsDependent {
 
         // Change status
         antiBotStatus = AntiBotStatus.LISTENING;
-        flagged = 0;
+        flaggedCounter.reset();
         antibotKicked.clear();
 
         // Cancel auto-disable task
@@ -158,17 +162,7 @@ public class AntiBotService implements SettingsDependent {
             return true;
         }
 
-        if (lastFlaggedJoin == null) {
-            lastFlaggedJoin = Instant.now();
-        }
-        if (ChronoUnit.SECONDS.between(lastFlaggedJoin, Instant.now()) <= interval) {
-            flagged++;
-        } else {
-            // reset to 1 because this player is also count as not registered
-            flagged = 1;
-            lastFlaggedJoin = null;
-        }
-        if (flagged > sensibility) {
+        if (flaggedCounter.handle()) {
             startProtection();
             return true;
         }

src/main/java/fr/xephi/authme/task/purge/PurgeService.java

@@ -99,7 +99,7 @@ public class PurgeService {
 
         isPurging = true;
         PurgeTask purgeTask = new PurgeTask(this, permissionsManager, sender, names, players);
-        bukkitService.runTaskTimer(purgeTask, 0, 1);
+        bukkitService.runTaskTimerAsynchronously(purgeTask, 0, 1);
     }
 
     /**

src/main/java/fr/xephi/authme/util/AtomicIntervalCounter.java

@@ -0,0 +1,53 @@
+package fr.xephi.authme.util;
+
+/**
+ * A thread-safe interval counter, allows to detect if an event happens more than 'threshold' times
+ * in the given 'interval'.
+ */
+public class AtomicIntervalCounter {
+    private final int threshold;
+    private final int interval;
+    private int count;
+    private long lastInsert;
+
+    /**
+     * Constructs a new counter.
+     *
+     * @param threshold the threshold value of the counter.
+     * @param interval the counter interval in milliseconds.
+     */
+    public AtomicIntervalCounter(int threshold, int interval) {
+        this.threshold = threshold;
+        this.interval = interval;
+        reset();
+    }
+
+    /**
+     * Resets the counter count.
+     */
+    public synchronized void reset() {
+        count = 0;
+        lastInsert = 0;
+    }
+
+    /**
+     * Increments the counter and returns true if the current count has reached the threshold value
+     * in the given interval, this will also reset the count value.
+     *
+     * @return true if the count has reached the threshold value.
+     */
+    public synchronized boolean handle() {
+        long now = System.currentTimeMillis();
+        if (now - lastInsert > interval) {
+            count = 1;
+        } else {
+            count++;
+        }
+        if (count > threshold) {
+            reset();
+            return true;
+        }
+        lastInsert = now;
+        return false;
+    }
+}