Add UUID support! - zreed, slipcor, t00thpick1

This commit updates our database managers to use UUIDs instead
of usernames for persistent storage.

Fixes #1979

src/main/java/com/gmail/nossr50/runnables/database/UUIDFetcherRunnable.java

@@ -0,0 +1,51 @@
+package com.gmail.nossr50.runnables.database;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+import java.util.Map.Entry;
+import java.util.UUID;
+
+import org.bukkit.scheduler.BukkitRunnable;
+
+import com.gmail.nossr50.mcMMO;
+import com.gmail.nossr50.util.uuid.UUIDFetcher;
+
+public class UUIDFetcherRunnable extends BukkitRunnable {
+    private List<String> names;
+
+    public UUIDFetcherRunnable(List<String> names) {
+        this.names = names;
+    }
+
+    public UUIDFetcherRunnable(String name) {
+        this.names = new ArrayList<String>();
+        this.names.add(name);
+    }
+
+    @Override
+    public void run() {
+        try {
+            Map<String, UUID> returns = new UUIDFetcher(this.names).call();
+            new CacheReturnedNames(returns).runTask(mcMMO.p);
+        }
+        catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+
+    private class CacheReturnedNames extends BukkitRunnable {
+        private Map<String, UUID> returns;
+
+        public CacheReturnedNames(Map<String, UUID> returns) {
+            this.returns = returns;
+        }
+
+        @Override
+        public void run() {
+            for (Entry<String, UUID> entry : this.returns.entrySet()) {
+                mcMMO.getDatabaseManager().saveUserUUID(entry.getKey(), entry.getValue());
+            }
+        }
+    }
+}

src/main/java/com/gmail/nossr50/runnables/database/UUIDUpdateAsyncTask.java

@@ -0,0 +1,73 @@
+package com.gmail.nossr50.runnables.database;
+
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.UUID;
+
+import org.bukkit.scheduler.BukkitRunnable;
+
+import com.gmail.nossr50.mcMMO;
+import com.gmail.nossr50.config.HiddenConfig;
+import com.gmail.nossr50.database.DatabaseManager;
+import com.gmail.nossr50.datatypes.database.UpgradeType;
+import com.gmail.nossr50.util.Misc;
+import com.gmail.nossr50.util.uuid.UUIDFetcher;
+
+public class UUIDUpdateAsyncTask extends BukkitRunnable {
+    private mcMMO plugin;
+    private static final int MAX_LOOKUP = Math.max(HiddenConfig.getInstance().getUUIDConvertAmount(), 100);
+
+    private List<String> userNames;
+    private int size;
+    private int checkedUsers;
+    private long startMillis;
+
+    public UUIDUpdateAsyncTask(mcMMO plugin, List<String> userNames) {
+        this.plugin = plugin;
+        this.userNames = userNames;
+
+        this.checkedUsers = 0;
+        this.startMillis = System.currentTimeMillis();
+    }
+
+    @Override
+    public void run() {
+        size = userNames.size();
+
+        plugin.getLogger().info("Starting to check and update UUIDs, total amount of users: " + size);
+
+        List<String> userNamesSection;
+        Map<String, UUID> fetchedUUIDs = new HashMap<String, UUID>();
+
+        while (size != 0) {
+            if (size > MAX_LOOKUP) {
+                userNamesSection = userNames.subList(size - MAX_LOOKUP, size);
+                size -= MAX_LOOKUP;
+            }
+            else {
+                userNamesSection = userNames.subList(0, size);
+                size = 0;
+            }
+
+            try {
+                fetchedUUIDs.putAll(new UUIDFetcher(userNamesSection).call());
+            }
+            catch (Exception e) {
+                plugin.getLogger().severe("Unable to fetch UUIDs!");
+                return;
+            }
+
+            checkedUsers += userNamesSection.size();
+            userNamesSection.clear();
+            size = userNames.size();
+
+            Misc.printProgress(checkedUsers, DatabaseManager.progressInterval, startMillis);
+        }
+
+        if (mcMMO.getDatabaseManager().saveUserUUIDs(fetchedUUIDs)) {
+            mcMMO.getUpgradeManager().setUpgradeCompleted(UpgradeType.ADD_UUIDS);
+            plugin.getLogger().info("UUID upgrade completed!");
+        }
+    }
+}