Modified internal configuration classes, Updated Mojang UUID fetcher, other various method and documentation tweaks

Bukkit/src/main/java/com/github/intellectualsites/plotsquared/bukkit/uuid/SQLUUIDHandler.java

@@ -31,13 +31,13 @@ import java.util.ArrayDeque;
 import java.util.Collections;
 import java.util.HashMap;
 import java.util.UUID;
+import java.util.concurrent.TimeUnit;
 
 public class SQLUUIDHandler extends UUIDHandlerImplementation {
 
     final int MAX_REQUESTS = 500;
     private final String PROFILE_URL =
         "https://sessionserver.mojang.com/session/minecraft/profile/";
-    private final int INTERVAL = 12000;
     private final JSONParser jsonParser = new JSONParser();
     private final SQLite sqlite;
 
@@ -133,7 +133,10 @@ public class SQLUUIDHandler extends UUIDHandlerImplementation {
                                     "Invalid response from Mojang: Some UUIDs will be cached later. (`unknown` until then or player joins)");
                             }
                             try {
-                                Thread.sleep(INTERVAL * 50);
+                                //Mojang allows requests every 10 minutes according to https://wiki.vg/Mojang_API
+                                //15 Minutes is chosen here since system timers are not always precise
+                                //and it should provide enough time where Mojang won't block requests.
+                                TimeUnit.MINUTES.sleep(15);
                             } catch (InterruptedException e) {
                                 e.printStackTrace();
                                 break;
@@ -142,7 +145,6 @@ public class SQLUUIDHandler extends UUIDHandlerImplementation {
                         if (whenDone != null) {
                             whenDone.run();
                         }
-                        return;
                     });
                 });
             } catch (SQLException e) {

Core/src/main/java/com/github/intellectualsites/plotsquared/configuration/ConfigurationOptions.java

@@ -6,7 +6,6 @@ package com.github.intellectualsites.plotsquared.configuration;
  */
 class ConfigurationOptions {
     private final Configuration configuration;
-    private char pathSeparator = '.';
     private boolean copyDefaults = false;
 
     protected ConfigurationOptions(Configuration configuration) {
@@ -26,28 +25,12 @@ class ConfigurationOptions {
      * Gets the char that will be used to separate {@link
      * ConfigurationSection}s.
      *
-     * <p>This value does not affect how the {@link Configuration} is stored,
-     * only in how you access the data. The default value is '.'.
+     * <p> This value is always '.'.
      *
      * @return Path separator
      */
-    public char pathSeparator() {
-        return pathSeparator;
-    }
-
-    /**
-     * Sets the char that will be used to separate {@link
-     * ConfigurationSection}s.
-     *
-     * <p>This value does not affect how the {@link Configuration} is stored,
-     * only in how you access the data. The default value is '.'.
-     *
-     * @param value Path separator
-     * @return This object, for chaining
-     */
-    public ConfigurationOptions pathSeparator(char value) {
-        pathSeparator = value;
-        return this;
+    char pathSeparator() {
+        return '.';
     }
 
     /**

Core/src/main/java/com/github/intellectualsites/plotsquared/configuration/MemoryConfigurationOptions.java

@@ -18,8 +18,4 @@ public class MemoryConfigurationOptions extends ConfigurationOptions {
         return this;
     }
 
-    @Override public MemoryConfigurationOptions pathSeparator(char value) {
-        super.pathSeparator(value);
-        return this;
-    }
 }

Core/src/main/java/com/github/intellectualsites/plotsquared/configuration/file/FileConfigurationOptions.java

@@ -25,11 +25,6 @@ public class FileConfigurationOptions extends MemoryConfigurationOptions {
         return this;
     }
 
-    @Override public FileConfigurationOptions pathSeparator(char value) {
-        super.pathSeparator(value);
-        return this;
-    }
-
     /**
      * Gets the header that will be applied to the top of the saved output.
      *

Core/src/main/java/com/github/intellectualsites/plotsquared/configuration/file/YamlConfigurationOptions.java

@@ -5,7 +5,6 @@ package com.github.intellectualsites.plotsquared.configuration.file;
  * YamlConfiguration}.
  */
 public class YamlConfigurationOptions extends FileConfigurationOptions {
-    private int indent = 2;
 
     YamlConfigurationOptions(YamlConfiguration configuration) {
         super(configuration);
@@ -20,11 +19,6 @@ public class YamlConfigurationOptions extends FileConfigurationOptions {
         return this;
     }
 
-    @Override public YamlConfigurationOptions pathSeparator(char value) {
-        super.pathSeparator(value);
-        return this;
-    }
-
     @Override public YamlConfigurationOptions header(String value) {
         super.header(value);
         return this;
@@ -42,27 +36,8 @@ public class YamlConfigurationOptions extends FileConfigurationOptions {
      *
      * @return How much to indent by
      */
-    public int indent() {
-        return indent;
+    int indent() {
+        return 2;
     }
 
-    /**
-     * Sets how much spaces should be used to indent each line.
-     *
-     * <p>The minimum value this may be is 2, and the maximum is 9.
-     *
-     * @param value New indent
-     * @return This object, for chaining
-     */
-    public YamlConfigurationOptions indent(int value) {
-        if (value < 2) {
-            throw new IllegalArgumentException("Indent must be at least 2 characters");
-        }
-        if (value > 9) {
-            throw new IllegalArgumentException("Indent cannot be greater than 9 characters");
-        }
-
-        indent = value;
-        return this;
-    }
 }

Core/src/main/java/com/github/intellectualsites/plotsquared/plot/commands/FlagCmd.java

@@ -24,10 +24,9 @@ import com.github.intellectualsites.plotsquared.plot.util.StringMan;
 
 import java.util.*;
 
-@CommandDeclaration(command = "setflag", aliases = {"f", "flag", "setf", "setflag"},
-    usage = "/plot flag <set|remove|add|list|info> <flag> <value>", description = "Set plot flags",
-    category = CommandCategory.SETTINGS, requiredType = RequiredType.NONE,
-    permission = "plots.flag") public class FlagCmd extends SubCommand {
+@CommandDeclaration(command = "setflag", aliases = {"f", "flag",
+    "setflag"}, usage = "/plot flag <set|remove|add|list|info> <flag> <value>", description = "Set plot flags", category = CommandCategory.SETTINGS, requiredType = RequiredType.NONE, permission = "plots.flag")
+public class FlagCmd extends SubCommand {
 
     private boolean checkPermValue(PlotPlayer player, Flag flag, String key, String value) {
         key = key.toLowerCase();

Core/src/main/java/com/github/intellectualsites/plotsquared/plot/commands/Inbox.java

@@ -149,8 +149,14 @@ import java.util.List;
                             }
                             PlotComment comment = value.get(index - 1);
                             inbox.removeComment(plot, comment);
-                            plot.removeComment(comment);
-                            MainUtil.sendMessage(player, Captions.COMMENT_REMOVED, comment.comment);
+                            boolean success = plot.removeComment(comment);
+                            //noinspection StatementWithEmptyBody
+                            if (success) {
+                                MainUtil
+                                    .sendMessage(player, Captions.COMMENT_REMOVED, comment.comment);
+                            } else {
+                                //TODO Comment removal failure message
+                            }
                         }
                     })) {
                         sendMessage(player, Captions.NOT_IN_PLOT);

Core/src/main/java/com/github/intellectualsites/plotsquared/plot/database/AbstractDB.java

@@ -1,12 +1,19 @@
 package com.github.intellectualsites.plotsquared.plot.database;
 
 import com.github.intellectualsites.plotsquared.plot.flag.Flag;
-import com.github.intellectualsites.plotsquared.plot.object.*;
+import com.github.intellectualsites.plotsquared.plot.object.Plot;
+import com.github.intellectualsites.plotsquared.plot.object.PlotArea;
+import com.github.intellectualsites.plotsquared.plot.object.PlotCluster;
+import com.github.intellectualsites.plotsquared.plot.object.PlotId;
+import com.github.intellectualsites.plotsquared.plot.object.RunnableVal;
 import com.github.intellectualsites.plotsquared.plot.object.comment.PlotComment;
 import org.jetbrains.annotations.NotNull;
 
-import javax.annotation.Nonnull;
-import java.util.*;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.UUID;
 
 public interface AbstractDB {
 
@@ -224,7 +231,7 @@ public interface AbstractDB {
 
     /**
      * @param cluster PlotCluster Object
-     * @param uuid    Player that should be removed
+     * @param uuid Player that should be removed
      */
     void setHelper(PlotCluster cluster, UUID uuid);
 
@@ -276,7 +283,7 @@ public interface AbstractDB {
     /**
      * Removes the specified comment from the given plot.
      *
-     * @param plot    the plot
+     * @param plot the plot
      * @param comment the comment to remove
      */
     void removeComment(Plot plot, PlotComment comment);
@@ -284,7 +291,7 @@ public interface AbstractDB {
     /**
      * Clears the specified inbox on the given plot.
      *
-     * @param plot  the plot
+     * @param plot the plot
      * @param inbox the inbox to clear
      */
     void clearInbox(Plot plot, String inbox);
@@ -292,13 +299,13 @@ public interface AbstractDB {
     /**
      * Adds the specified comment to the given plot.
      *
-     * @param plot    the plot
+     * @param plot the plot
      * @param comment the comment to add
      */
     void setComment(Plot plot, PlotComment comment);
 
     /**
-     * Gets Plot Comments.
+     * Gets Plot comments.
      *
      * @param plot The Plot to get comments from
      */

Core/src/main/java/com/github/intellectualsites/plotsquared/plot/database/DBFunc.java

@@ -1,13 +1,21 @@
 package com.github.intellectualsites.plotsquared.plot.database;
 
 import com.github.intellectualsites.plotsquared.plot.flag.Flag;
-import com.github.intellectualsites.plotsquared.plot.object.*;
+import com.github.intellectualsites.plotsquared.plot.object.Plot;
+import com.github.intellectualsites.plotsquared.plot.object.PlotArea;
+import com.github.intellectualsites.plotsquared.plot.object.PlotCluster;
+import com.github.intellectualsites.plotsquared.plot.object.PlotId;
+import com.github.intellectualsites.plotsquared.plot.object.RunnableVal;
 import com.github.intellectualsites.plotsquared.plot.object.comment.PlotComment;
 
 import java.sql.ResultSet;
 import java.sql.ResultSetMetaData;
 import java.sql.SQLException;
-import java.util.*;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.UUID;
 
 /**
  * Database Functions
@@ -74,6 +82,8 @@ public class DBFunc {
         DBFunc.dbManager.validateAllPlots(plots);
     }
 
+
+    //TODO Consider Removal
     /**
      * Check if a {@link ResultSet} contains a column.
      *
@@ -81,7 +91,7 @@ public class DBFunc {
      * @param name
      * @return
      */
-    public static boolean hasColumn(ResultSet resultSet, String name) {
+    @Deprecated public static boolean hasColumn(ResultSet resultSet, String name) {
         try {
             ResultSetMetaData meta = resultSet.getMetaData();
             int count = meta.getColumnCount();

Core/src/main/java/com/github/intellectualsites/plotsquared/plot/generator/ClassicPlotManager.java

@@ -24,29 +24,21 @@ public class ClassicPlotManager extends SquarePlotManager {
                                           BlockBucket blocks) {
         switch (component) {
             case "floor":
-                setFloor(plotId, blocks);
-                return true;
+                return setFloor(plotId, blocks);
             case "wall":
-                setWallFilling(plotId, blocks);
-                return true;
+                return setWallFilling(plotId, blocks);
             case "all":
-                setAll(plotId, blocks);
-                return true;
+                return setAll(plotId, blocks);
             case "air":
-                setAir(plotId, blocks);
-                return true;
+                return setAir(plotId, blocks);
             case "main":
-                setMain(plotId, blocks);
-                return true;
+                return setMain(plotId, blocks);
             case "middle":
-                setMiddle(plotId, blocks);
-                return true;
+                return setMiddle(plotId, blocks);
             case "outline":
-                setOutline(plotId, blocks);
-                return true;
+                return setOutline(plotId, blocks);
             case "border":
-                setWall(plotId, blocks);
-                return true;
+                return setWall(plotId, blocks);
         }
         return false;
     }
@@ -54,8 +46,7 @@ public class ClassicPlotManager extends SquarePlotManager {
     @Override public boolean unClaimPlot(Plot plot, Runnable whenDone) {
         setWallFilling(plot.getId(), classicPlotWorld.WALL_FILLING);
         setWall(plot.getId(), classicPlotWorld.WALL_BLOCK);
-        GlobalBlockQueue.IMP.addTask(whenDone);
-        return true;
+        return GlobalBlockQueue.IMP.addTask(whenDone);
     }
 
     public boolean setFloor(PlotId plotId, BlockBucket blocks) {
@@ -70,8 +61,7 @@ public class ClassicPlotManager extends SquarePlotManager {
                 queue.setCuboid(pos1, pos2, blocks);
             }
         }
-        queue.enqueue();
-        return true;
+        return queue.enqueue();
     }
 
     public boolean setAll(PlotId plotId, BlockBucket blocks) {
@@ -86,8 +76,7 @@ public class ClassicPlotManager extends SquarePlotManager {
             Location pos2 = new Location(classicPlotWorld.worldname, region.maxX, maxY, region.maxZ);
             queue.setCuboid(pos1, pos2, blocks);
         }
-        queue.enqueue();
-        return true;
+        return queue.enqueue();
     }
 
     public boolean setAir(PlotId plotId, BlockBucket blocks) {
@@ -103,8 +92,7 @@ public class ClassicPlotManager extends SquarePlotManager {
             Location pos2 = new Location(classicPlotWorld.worldname, region.maxX, maxY, region.maxZ);
             queue.setCuboid(pos1, pos2, blocks);
         }
-        queue.enqueue();
-        return true;
+        return queue.enqueue();
     }
 
     public boolean setMain(PlotId plotId, BlockBucket blocks) {
@@ -119,8 +107,7 @@ public class ClassicPlotManager extends SquarePlotManager {
                 new Location(classicPlotWorld.worldname, region.maxX, classicPlotWorld.PLOT_HEIGHT - 1, region.maxZ);
             queue.setCuboid(pos1, pos2, blocks);
         }
-        queue.enqueue();
-        return true;
+        return queue.enqueue();
     }
 
     public boolean setMiddle(PlotId plotId, BlockBucket blocks) {
@@ -134,8 +121,7 @@ public class ClassicPlotManager extends SquarePlotManager {
         int x = MathMan.average(corners[0].getX(), corners[1].getX());
         int z = MathMan.average(corners[0].getZ(), corners[1].getZ());
         queue.setBlock(x, classicPlotWorld.PLOT_HEIGHT, z, blocks.getBlock());
-        queue.enqueue();
-        return true;
+        return queue.enqueue();
     }
 
     public boolean setOutline(PlotId plotId, BlockBucket blocks) {
@@ -187,8 +173,7 @@ public class ClassicPlotManager extends SquarePlotManager {
                 queue.setCuboid(pos1, pos2, blocks);
             }
         }
-        queue.enqueue();
-        return true;
+        return queue.enqueue();
     }
 
     public boolean setWallFilling(PlotId plotId, BlockBucket blocks) {
@@ -235,8 +220,7 @@ public class ClassicPlotManager extends SquarePlotManager {
                 }
             }
         }
-        queue.enqueue();
-        return true;
+        return queue.enqueue();
     }
 
     public boolean setWall(PlotId plotId, BlockBucket blocks) {
@@ -276,8 +260,7 @@ public class ClassicPlotManager extends SquarePlotManager {
                 queue.setBlock(x, y, z, blocks.getBlock());
             }
         }
-        queue.enqueue();
-        return true;
+        return queue.enqueue();
     }
 
     /**
@@ -308,8 +291,7 @@ public class ClassicPlotManager extends SquarePlotManager {
             new Location(classicPlotWorld.worldname, ex, classicPlotWorld.WALL_HEIGHT + 1, ez - 1), classicPlotWorld.WALL_BLOCK);
         queue.setCuboid(new Location(classicPlotWorld.worldname, sx + 1, 1, sz + 1),
             new Location(classicPlotWorld.worldname, ex - 1, classicPlotWorld.ROAD_HEIGHT, ez - 1), classicPlotWorld.ROAD_BLOCK);
-        queue.enqueue();
-        return true;
+        return queue.enqueue();
     }
 
     @Override public boolean createRoadSouth(Plot plot) {
@@ -337,8 +319,7 @@ public class ClassicPlotManager extends SquarePlotManager {
             new Location(classicPlotWorld.worldname, ex - 1, classicPlotWorld.WALL_HEIGHT + 1, ez), classicPlotWorld.WALL_BLOCK);
         queue.setCuboid(new Location(classicPlotWorld.worldname, sx + 1, 1, sz + 1),
             new Location(classicPlotWorld.worldname, ex - 1, classicPlotWorld.ROAD_HEIGHT, ez - 1), classicPlotWorld.ROAD_BLOCK);
-        queue.enqueue();
-        return true;
+        return queue.enqueue();
     }
 
     @Override public boolean createRoadSouthEast(Plot plot) {
@@ -356,8 +337,7 @@ public class ClassicPlotManager extends SquarePlotManager {
             PlotBlock.get((short) 7, (byte) 0));
         queue.setCuboid(new Location(classicPlotWorld.worldname, sx + 1, 1, sz + 1),
             new Location(classicPlotWorld.worldname, ex - 1, classicPlotWorld.ROAD_HEIGHT, ez - 1), classicPlotWorld.ROAD_BLOCK);
-        queue.enqueue();
-        return true;
+        return queue.enqueue();
     }
 
     @Override public boolean removeRoadEast(Plot plot) {
@@ -377,8 +357,7 @@ public class ClassicPlotManager extends SquarePlotManager {
             new Location(classicPlotWorld.worldname, ex, classicPlotWorld.PLOT_HEIGHT - 1, ez - 1), classicPlotWorld.MAIN_BLOCK);
         queue.setCuboid(new Location(classicPlotWorld.worldname, sx, classicPlotWorld.PLOT_HEIGHT, sz + 1),
             new Location(classicPlotWorld.worldname, ex, classicPlotWorld.PLOT_HEIGHT, ez - 1), classicPlotWorld.TOP_BLOCK);
-        queue.enqueue();
-        return true;
+        return queue.enqueue();
     }
 
     @Override public boolean removeRoadSouth(Plot plot) {
@@ -398,8 +377,7 @@ public class ClassicPlotManager extends SquarePlotManager {
             new Location(classicPlotWorld.worldname, ex - 1, classicPlotWorld.PLOT_HEIGHT - 1, ez), classicPlotWorld.MAIN_BLOCK);
         queue.setCuboid(new Location(classicPlotWorld.worldname, sx + 1, classicPlotWorld.PLOT_HEIGHT, sz),
             new Location(classicPlotWorld.worldname, ex - 1, classicPlotWorld.PLOT_HEIGHT, ez), classicPlotWorld.TOP_BLOCK);
-        queue.enqueue();
-        return true;
+        return queue.enqueue();
     }
 
     @Override public boolean removeRoadSouthEast(Plot plot) {
@@ -416,14 +394,14 @@ public class ClassicPlotManager extends SquarePlotManager {
             new Location(classicPlotWorld.worldname, ex, classicPlotWorld.ROAD_HEIGHT - 1, ez), classicPlotWorld.MAIN_BLOCK);
         queue.setCuboid(new Location(classicPlotWorld.worldname, sx, classicPlotWorld.ROAD_HEIGHT, sz),
             new Location(classicPlotWorld.worldname, ex, classicPlotWorld.ROAD_HEIGHT, ez), classicPlotWorld.TOP_BLOCK);
-        queue.enqueue();
-        return true;
+        return queue.enqueue();
     }
 
     /**
      * Finishing off plot merging by adding in the walls surrounding the plot (OPTIONAL)(UNFINISHED).
      */
     @Override public boolean finishPlotMerge(List<PlotId> plotIds) {
+        //TODO This method shouldn't always return true
         final BlockBucket block = classicPlotWorld.CLAIMED_WALL_BLOCK;
         plotIds.forEach(id -> setWall(id, block));
         if (Settings.General.MERGE_REPLACE_WALL) {
@@ -434,12 +412,14 @@ public class ClassicPlotManager extends SquarePlotManager {
     }
 
     @Override public boolean finishPlotUnlink(List<PlotId> plotIds) {
+        //TODO This method shouldn't always return true
         final BlockBucket block = classicPlotWorld.CLAIMED_WALL_BLOCK;
         plotIds.forEach(id -> setWall(id, block));
         return true;
     }
 
     @Override public boolean regenerateAllPlotWalls() {
+        //TODO This method shouldn't always return true
         for (Plot plot : classicPlotWorld.getPlots()) {
             if (plot.hasOwner()) {
                 setWall(plot.getId(), classicPlotWorld.CLAIMED_WALL_BLOCK);
@@ -460,8 +440,7 @@ public class ClassicPlotManager extends SquarePlotManager {
 
     @Override public boolean claimPlot(Plot plot) {
         final BlockBucket claim = classicPlotWorld.CLAIMED_WALL_BLOCK;
-        setWall(plot.getId(), claim);
-        return true;
+        return setWall(plot.getId(), claim);
     }
 
     @Override public String[] getPlotComponents(PlotId plotId) {

Core/src/main/java/com/github/intellectualsites/plotsquared/plot/object/Plot.java

@@ -2418,20 +2418,16 @@ public class Plot {
      * @param direction
      * @return
      */
-    public Plot getRelative(int direction) {
+    @Deprecated public Plot getRelative(int direction) {
         return this.area.getPlotAbs(this.id.getRelative(direction));
     }
 
     /**
-     * Gets the plot in a relative direction<br>
-     * 0 = north<br>
-     * 1 = east<br>
-     * 2 = south<br>
-     * 3 = west<br>
+     * Gets the plot in a relative direction
      * Note: May be null if the partial plot area does not include the relative location
      *
      * @param direction
-     * @return
+     * @return the plot relative to this one
      */
     public Plot getRelative(Direction direction) {
         return this.area.getPlotAbs(this.id.getRelative(direction));
@@ -2441,7 +2437,7 @@ public class Plot {
      * Gets a set of plots connected (and including) this plot<br>
      * - This result is cached globally
      *
-     * @return
+     * @return a Set of Plots connected to this Plot
      */
     public Set<Plot> getConnectedPlots() {
         if (this.settings == null) {
@@ -2802,6 +2798,11 @@ public class Plot {
         return false;
     }
 
+    /**
+     * Checks if the owner of this Plot is online.
+     *
+     * @return true if the owner of the Plot is online
+     */
     public boolean isOnline() {
         if (this.owner == null) {
             return false;
@@ -3098,23 +3099,23 @@ public class Plot {
         return getFlags().containsKey(flag);
     }
 
-    @SuppressWarnings("deprecation") public boolean removeComment(PlotComment comment) {
+    public boolean removeComment(PlotComment comment) {
         return getSettings().removeComment(comment);
     }
 
-    @SuppressWarnings("deprecation") public void removeComments(List<PlotComment> comments) {
+    public void removeComments(List<PlotComment> comments) {
         getSettings().removeComments(comments);
     }
 
-    @SuppressWarnings("deprecation") public List<PlotComment> getComments(String inbox) {
+    public List<PlotComment> getComments(String inbox) {
         return getSettings().getComments(inbox);
     }
 
-    @SuppressWarnings("deprecation") public void addComment(PlotComment comment) {
+    public void addComment(PlotComment comment) {
         getSettings().addComment(comment);
     }
 
-    @SuppressWarnings("deprecation") public void setComments(List<PlotComment> list) {
+    public void setComments(List<PlotComment> list) {
         getSettings().setComments(list);
     }
 

Core/src/main/java/com/github/intellectualsites/plotsquared/plot/util/block/DelegateLocalBlockQueue.java

@@ -102,9 +102,10 @@ public class DelegateLocalBlockQueue extends LocalBlockQueue {
         }
     }
 
-    @Override public void enqueue() {
+    @Override public boolean enqueue() {
         if (parent != null) {
-            parent.enqueue();
+            return parent.enqueue();
         }
+        return false;
     }
 }

Core/src/main/java/com/github/intellectualsites/plotsquared/plot/util/block/GlobalBlockQueue.java

@@ -45,10 +45,10 @@ public class GlobalBlockQueue {
 
     public GlobalBlockQueue(QueueProvider provider, int threads) {
         this.provider = provider;
-        activeQueues = new ConcurrentLinkedDeque<>();
-        inactiveQueues = new ConcurrentLinkedDeque<>();
-        runnables = new ConcurrentLinkedDeque<>();
-        running = new AtomicBoolean();
+        this.activeQueues = new ConcurrentLinkedDeque<>();
+        this.inactiveQueues = new ConcurrentLinkedDeque<>();
+        this.runnables = new ConcurrentLinkedDeque<>();
+        this.running = new AtomicBoolean();
         this.PARALLEL_THREADS = threads;
     }
 
@@ -151,12 +151,20 @@ public class GlobalBlockQueue {
         return false;
     }
 
-    public void enqueue(LocalBlockQueue queue) {
-        inactiveQueues.remove(queue);
+    /**
+     * TODO Documentation needed.
+     *
+     * @param queue todo
+     * @return true if added to queue, false otherwise
+     */
+    public boolean enqueue(LocalBlockQueue queue) {
+        boolean success = false;
+        success = inactiveQueues.remove(queue);
         if (queue.size() > 0 && !activeQueues.contains(queue)) {
             queue.optimize();
-            activeQueues.add(queue);
+            success = activeQueues.add(queue);
         }
+        return success;
     }
 
     public void dequeue(LocalBlockQueue queue) {

Core/src/main/java/com/github/intellectualsites/plotsquared/plot/util/block/LocalBlockQueue.java

@@ -96,8 +96,8 @@ public abstract class LocalBlockQueue {
         }
     }
 
-    public void enqueue() {
-        GlobalBlockQueue.IMP.enqueue(this);
+    public boolean enqueue() {
+        return GlobalBlockQueue.IMP.enqueue(this);
     }
 
     public void setCuboid(Location pos1, Location pos2, PlotBlock block) {