Added expiration timer to sessions. Sessions will now last up to 10 minutes (by default) before removed, so you can quickly disconnect (or crash) and come back and still maintain your history.

src/main/java/com/sk89q/worldedit/bukkit/BukkitConfiguration.java

@@ -82,6 +82,7 @@ public class BukkitConfiguration extends LocalConfiguration {
         noOpPermissions = config.getBoolean("no-op-permissions", false);
         
         LocalSession.MAX_HISTORY_SIZE = Math.max(15, config.getInt("history.size", 15));
+        LocalSession.EXPIRATION_GRACE = config.getInt("history.expiration", 10) * 60 * 1000;
         
         String snapshotsDir = config.getString("snapshots.directory", "");
         if (!snapshotsDir.trim().equals("")) {

src/main/java/com/sk89q/worldedit/bukkit/SessionTimer.java

@@ -0,0 +1,51 @@
+// $Id$
+/*
+ * WorldEdit
+ * Copyright (C) 2010, 2011 sk89q <http://www.sk89q.com>
+ *
+ * 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 <http://www.gnu.org/licenses/>.
+*/
+
+package com.sk89q.worldedit.bukkit;
+
+import org.bukkit.Server;
+import org.bukkit.entity.Player;
+import com.sk89q.worldedit.SessionCheck;
+import com.sk89q.worldedit.WorldEdit;
+
+/**
+ * Used to remove expired sessions in Bukkit.
+ *
+ * @author sk89q
+ */
+public class SessionTimer implements Runnable {
+    
+    private WorldEdit worldEdit;
+    private SessionCheck checker;
+    
+    public SessionTimer(WorldEdit worldEdit, final Server server) {
+        this.worldEdit = worldEdit;
+        this.checker = new SessionCheck() {
+            public boolean isOnlinePlayer(String name) {
+                Player player = server.getPlayer(name);
+                return player != null && player.isOnline();
+            }
+        };
+    }
+
+    public void run() {
+        worldEdit.flushExpiredSessions(checker);
+    }
+
+}

src/main/java/com/sk89q/worldedit/bukkit/WorldEditPlayerListener.java

@@ -79,7 +79,7 @@ public class WorldEditPlayerListener extends PlayerListener {
      */
     @Override
     public void onPlayerQuit(PlayerQuitEvent event) {
-        plugin.getWorldEdit().handleDisconnect(wrapPlayer(event.getPlayer()));
+        plugin.getWorldEdit().markExpire(wrapPlayer(event.getPlayer()));
     }
 
     /**

src/main/java/com/sk89q/worldedit/bukkit/WorldEditPlugin.java

@@ -101,6 +101,9 @@ public class WorldEditPlugin extends JavaPlugin {
 
         // Now we can register events!
         registerEvents();
+        
+        getServer().getScheduler().scheduleAsyncRepeatingTask(this, 
+                new SessionTimer(controller, getServer()), 120, 120);
     }
 
     /**