A little spring cleaning

- Add Javadoc comments for where QueueCoordinator can be given or nulled
 - Add some more Javadoc comments in general
 - Squash methods into one where QueueCoordinator can be given
 - Only use one queue in some places where it makes sense

Core/src/main/java/com/plotsquared/core/command/DebugRoadRegen.java

@@ -34,9 +34,10 @@ import com.plotsquared.core.player.PlotPlayer;
 import com.plotsquared.core.plot.Plot;
 import com.plotsquared.core.plot.PlotArea;
 import com.plotsquared.core.plot.PlotManager;
+import com.plotsquared.core.queue.QueueCoordinator;
 import com.plotsquared.core.util.MainUtil;
-import javax.annotation.Nonnull;
 
+import javax.annotation.Nonnull;
 import java.util.Arrays;
 
 @CommandDeclaration(command = "debugroadregen",
@@ -85,12 +86,15 @@ public class DebugRoadRegen extends SubCommand {
             Captions.REQUIRES_UNMERGED.send(player);
         } else {
             PlotManager manager = area.getPlotManager();
-            manager.createRoadEast(plot);
+            QueueCoordinator queue = area.getQueue();
-            manager.createRoadSouth(plot);
+            manager.createRoadEast(plot, queue);
-            manager.createRoadSouthEast(plot);
+            manager.createRoadSouth(plot, queue);
-            MainUtil.sendMessage(player, "&6Regenerating plot south/east roads: " + plot.getId()
+            manager.createRoadSouthEast(plot, queue);
-                + "\n&6 - Result: &aSuccess");
+            queue.setCompleteTask(() -> {
-            MainUtil.sendMessage(player, "&cTo regenerate all roads: /plot regenallroads");
+                MainUtil.sendMessage(player, "&6Regenerating plot south/east roads: " + plot.getId() + "\n&6 - Result: &aSuccess");
+                MainUtil.sendMessage(player, "&cTo regenerate all roads: /plot regenallroads");
+            });
+            queue.enqueue();
         }
         return true;
     }

Core/src/main/java/com/plotsquared/core/generator/ClassicPlotManager.java

@@ -60,8 +60,10 @@ public class ClassicPlotManager extends SquarePlotManager {
         this.regionManager = regionManager;
     }
 
-    @Override
+    @Override public boolean setComponent(@Nonnull PlotId plotId,
-    public boolean setComponent(@Nonnull PlotId plotId, @Nonnull String component, @Nonnull Pattern blocks, @Nullable QueueCoordinator queue) {
+                                          @Nonnull String component,
+                                          @Nonnull Pattern blocks,
+                                          @Nullable QueueCoordinator queue) {
         final Optional<ClassicPlotManagerComponent> componentOptional = ClassicPlotManagerComponent.fromString(component);
         if (componentOptional.isPresent()) {
             switch (componentOptional.get()) {
@@ -96,6 +98,12 @@ public class ClassicPlotManager extends SquarePlotManager {
         return true;
     }
 
+    /**
+     * Set the plot floor
+     *
+     * @param queue Nullable {@link QueueCoordinator}. If null, creates own queue and enqueues,
+     *              otherwise writes to the queue but does not enqueue.
+     */
     public boolean setFloor(@Nonnull PlotId plotId, @Nonnull Pattern blocks, @Nullable QueueCoordinator queue) {
         Plot plot = classicPlotWorld.getPlotAbs(plotId);
         if (plot != null && plot.isBasePlot()) {
@@ -105,6 +113,12 @@ public class ClassicPlotManager extends SquarePlotManager {
         return false;
     }
 
+    /**
+     * Sets the plot main, floor and air areas.
+     *
+     * @param queue Nullable {@link QueueCoordinator}. If null, creates own queue and enqueues,
+     *              otherwise writes to the queue but does not enqueue.
+     */
     public boolean setAll(@Nonnull PlotId plotId, @Nonnull Pattern blocks, @Nullable QueueCoordinator queue) {
         Plot plot = classicPlotWorld.getPlotAbs(plotId);
         if (plot != null && plot.isBasePlot()) {
@@ -113,6 +127,12 @@ public class ClassicPlotManager extends SquarePlotManager {
         return false;
     }
 
+    /**
+     * Sets the plot air region.
+     *
+     * @param queue Nullable {@link QueueCoordinator}. If null, creates own queue and enqueues,
+     *              otherwise writes to the queue but does not enqueue.
+     */
     public boolean setAir(@Nonnull PlotId plotId, @Nonnull Pattern blocks, @Nullable QueueCoordinator queue) {
         Plot plot = classicPlotWorld.getPlotAbs(plotId);
         if (plot != null && plot.isBasePlot()) {
@@ -122,6 +142,12 @@ public class ClassicPlotManager extends SquarePlotManager {
         return false;
     }
 
+    /**
+     * Sets the plot main blocks.
+     *
+     * @param queue Nullable {@link QueueCoordinator}. If null, creates own queue and enqueues,
+     *              otherwise writes to the queue but does not enqueue.
+     */
     public boolean setMain(@Nonnull PlotId plotId, @Nonnull Pattern blocks, @Nullable QueueCoordinator queue) {
         Plot plot = classicPlotWorld.getPlotAbs(plotId);
         if (plot == null || plot.isBasePlot()) {
@@ -130,6 +156,12 @@ public class ClassicPlotManager extends SquarePlotManager {
         return false;
     }
 
+    /**
+     * Set the middle plot block to a Pattern
+     *
+     * @param queue Nullable {@link QueueCoordinator}. If null, creates own queue and enqueues,
+     *              otherwise writes to the queue but does not enqueue.
+     */
     public boolean setMiddle(@Nonnull PlotId plotId, @Nonnull Pattern blocks, @Nullable QueueCoordinator queue) {
         Plot plot = classicPlotWorld.getPlotAbs(plotId);
         if (plot == null || !plot.isBasePlot()) {
@@ -149,6 +181,12 @@ public class ClassicPlotManager extends SquarePlotManager {
         return !enqueue || queue.enqueue();
     }
 
+    /**
+     * Set a plot's outline
+     *
+     * @param queue Nullable {@link QueueCoordinator}. If null, creates own queue and enqueues,
+     *              otherwise writes to the queue but does not enqueue.
+     */
     public boolean setOutline(@Nonnull PlotId plotId, @Nonnull Pattern blocks, @Nullable QueueCoordinator queue) {
         if (classicPlotWorld.ROAD_WIDTH == 0) {
             return false;
@@ -216,6 +254,12 @@ public class ClassicPlotManager extends SquarePlotManager {
         return !enqueue || queue.enqueue();
     }
 
+    /**
+     * Set the wall filling for a plot
+     *
+     * @param queue Nullable {@link QueueCoordinator}. If null, creates own queue and enqueues,
+     *              otherwise writes to the queue but does not enqueue.
+     */
     public boolean setWallFilling(@Nonnull PlotId plotId, @Nonnull Pattern blocks, @Nullable QueueCoordinator queue) {
         if (classicPlotWorld.ROAD_WIDTH == 0) {
             return false;
@@ -274,6 +318,12 @@ public class ClassicPlotManager extends SquarePlotManager {
         return !enqueue || queue.enqueue();
     }
 
+    /**
+     * Set a plot's wall top block only
+     *
+     * @param queue Nullable {@link QueueCoordinator}. If null, creates own queue and enqueues,
+     *              otherwise writes to the queue but does not enqueue.
+     */
     public boolean setWall(@Nonnull PlotId plotId, @Nonnull Pattern blocks, @Nullable QueueCoordinator queue) {
         if (classicPlotWorld.ROAD_WIDTH == 0) {
             return false;
@@ -325,9 +375,6 @@ public class ClassicPlotManager extends SquarePlotManager {
         return !enqueue || queue.enqueue();
     }
 
-    /**
-     * PLOT MERGING.
-     */
     @Override public boolean createRoadEast(@Nonnull Plot plot, @Nullable QueueCoordinator queue) {
         Location pos1 = getPlotBottomLocAbs(plot.getId());
         Location pos2 = getPlotTopLocAbs(plot.getId());
@@ -363,7 +410,7 @@ public class ClassicPlotManager extends SquarePlotManager {
         }
         queue.setCuboid(Location.at(classicPlotWorld.getWorldName(), sx + 1, 1, sz + 1),
             Location.at(classicPlotWorld.getWorldName(), ex - 1, classicPlotWorld.ROAD_HEIGHT, ez - 1), classicPlotWorld.ROAD_BLOCK.toPattern());
-        return queue.enqueue();
+        return !enqueue || queue.enqueue();
     }
 
     @Override public boolean createRoadSouth(@Nonnull Plot plot, @Nullable QueueCoordinator queue) {
@@ -401,9 +448,10 @@ public class ClassicPlotManager extends SquarePlotManager {
         }
         queue.setCuboid(Location.at(classicPlotWorld.getWorldName(), sx + 1, 1, sz + 1),
             Location.at(classicPlotWorld.getWorldName(), ex - 1, classicPlotWorld.ROAD_HEIGHT, ez - 1), classicPlotWorld.ROAD_BLOCK.toPattern());
-        return queue.enqueue();
+        return !enqueue || queue.enqueue();
     }
 
+
     @Override public boolean createRoadSouthEast(@Nonnull Plot plot, @Nullable QueueCoordinator queue) {
         Location pos2 = getPlotTopLocAbs(plot.getId());
         int sx = pos2.getX() + 1;
@@ -504,11 +552,6 @@ public class ClassicPlotManager extends SquarePlotManager {
         return !enqueue || queue.enqueue();
     }
 
-    /**
-     * Finishing off plot merging by adding in the walls surrounding the plot (OPTIONAL)(UNFINISHED).
-     *
-     * @return false if part of the merge failed, otherwise true if successful.
-     */
     @Override public boolean finishPlotMerge(@Nonnull List<PlotId> plotIds, @Nullable QueueCoordinator queue) {
         final BlockBucket claim = classicPlotWorld.CLAIMED_WALL_BLOCK;
         if (classicPlotWorld.PLACE_TOP_BLOCK && (!claim.isAir() || !claim.equals(classicPlotWorld.WALL_BLOCK))) {

Core/src/main/java/com/plotsquared/core/generator/HybridPlotManager.java

@@ -93,8 +93,8 @@ public class HybridPlotManager extends ClassicPlotManager {
         Template.zipAll(hybridPlotWorld.getWorldName(), files);
     }
 
-    @Override public boolean createRoadEast(@Nonnull final Plot plot) {
+    @Override public boolean createRoadEast(@Nonnull final Plot plot, @Nullable QueueCoordinator queue) {
-        super.createRoadEast(plot);
+        super.createRoadEast(plot, queue);
         PlotId id = plot.getId();
         PlotId id2 = PlotId.of(id.getX() + 1, id.getY());
         Location bot = getPlotBottomLocAbs(id2);
@@ -105,10 +105,13 @@ public class HybridPlotManager extends ClassicPlotManager {
         if (!hybridPlotWorld.ROAD_SCHEMATIC_ENABLED) {
             return true;
         }
-        QueueCoordinator queue = hybridPlotWorld.getQueue();
+        boolean enqueue = false;
+        if (queue == null) {
+            queue = hybridPlotWorld.getQueue();
+            enqueue = true;
+        }
         createSchemAbs(queue, pos1, pos2, true);
-        queue.enqueue();
+        return !enqueue || queue.enqueue();
-        return true;
     }
 
     private void resetBiome(@Nonnull final HybridPlotWorld hybridPlotWorld, @Nonnull final Location pos1, @Nonnull final Location pos2) {
@@ -159,8 +162,8 @@ public class HybridPlotManager extends ClassicPlotManager {
         }
     }
 
-    @Override public boolean createRoadSouth(@Nonnull final Plot plot) {
+    @Override public boolean createRoadSouth(@Nonnull final Plot plot, @Nullable QueueCoordinator queue) {
-        super.createRoadSouth(plot);
+        super.createRoadSouth(plot, queue);
         PlotId id = plot.getId();
         PlotId id2 = PlotId.of(id.getX(), id.getY() + 1);
         Location bot = getPlotBottomLocAbs(id2);
@@ -171,24 +174,31 @@ public class HybridPlotManager extends ClassicPlotManager {
         if (!hybridPlotWorld.ROAD_SCHEMATIC_ENABLED) {
             return true;
         }
-        QueueCoordinator queue = hybridPlotWorld.getQueue();
+        boolean enqueue = false;
+        if (queue == null) {
+            enqueue = true;
+            queue = hybridPlotWorld.getQueue();
+        }
         createSchemAbs(queue, pos1, pos2, true);
-        queue.enqueue();
+        return !enqueue || queue.enqueue();
-        return true;
     }
 
-    @Override public boolean createRoadSouthEast(@Nonnull final Plot plot) {
+    @Override public boolean createRoadSouthEast(@Nonnull final Plot plot, @Nullable QueueCoordinator queue) {
-        super.createRoadSouthEast(plot);
+        super.createRoadSouthEast(plot, queue);
         PlotId id = plot.getId();
         PlotId id2 = PlotId.of(id.getX() + 1, id.getY() + 1);
         Location pos1 = getPlotTopLocAbs(id).add(1, 0, 1).withY(0);
         Location pos2 = getPlotBottomLocAbs(id2).withY(Math.min(getWorldHeight(), 255));
-        QueueCoordinator queue = hybridPlotWorld.getQueue();
+        boolean enqueue = false;
+        if (queue == null) {
+            enqueue = true;
+            queue = hybridPlotWorld.getQueue();
+        }
         createSchemAbs(queue, pos1, pos2, true);
         if (hybridPlotWorld.ROAD_SCHEMATIC_ENABLED) {
             createSchemAbs(queue, pos1, pos2, true);
         }
-        return queue.enqueue();
+        return !enqueue || queue.enqueue();
     }
 
     /**
@@ -198,7 +208,7 @@ public class HybridPlotManager extends ClassicPlotManager {
      * don't need to do something quite as complex unless you happen to have 512x512 sized plots.
      * </p>
      */
-    @Override public boolean clearPlot(@Nonnull final Plot plot, @Nullable final Runnable whenDone) {
+    @Override public boolean clearPlot(@Nonnull final Plot plot, @Nullable final Runnable whenDone, @Nullable QueueCoordinator queue) {
         if (this.regionManager.notifyClear(this)) {
             //If this returns false, the clear didn't work
             if (this.regionManager.handleClear(plot, whenDone, this)) {
@@ -224,7 +234,11 @@ public class HybridPlotManager extends ClassicPlotManager {
         }
 
         final BiomeType biome = hybridPlotWorld.getPlotBiome();
-        final QueueCoordinator queue = hybridPlotWorld.getQueue();
+        boolean enqueue = false;
+        if (queue == null) {
+            enqueue = true;
+            queue = hybridPlotWorld.getQueue();
+        }
         if (!canRegen) {
             queue.setCuboid(pos1.withY(0), pos2.withY(0), bedrock);
             // Each component has a different layer
@@ -236,8 +250,10 @@ public class HybridPlotManager extends ClassicPlotManager {
             queue.setRegenRegion(new CuboidRegion(pos1.getBlockVector3(), pos2.getBlockVector3()));
         }
         pastePlotSchematic(queue, pos1, pos2);
-        queue.setCompleteTask(whenDone);
+        if (whenDone != null) {
-        return queue.enqueue();
+            queue.setCompleteTask(whenDone);
+        }
+        return !enqueue || queue.enqueue();
     }
 
     public void pastePlotSchematic(@Nonnull final QueueCoordinator queue, @Nonnull final Location bottom, @Nonnull final Location top) {

Core/src/main/java/com/plotsquared/core/generator/HybridUtils.java

@@ -109,7 +109,7 @@ public class HybridUtils {
 
     public void regeneratePlotWalls(final PlotArea area) {
         PlotManager plotManager = area.getPlotManager();
-        plotManager.regenerateAllPlotWalls();
+        plotManager.regenerateAllPlotWalls(null);
     }
 
     public void analyzeRegion(final String world, final CuboidRegion region, final RunnableVal<PlotAnalysis> whenDone) {

Core/src/main/java/com/plotsquared/core/plot/Plot.java

@@ -1061,13 +1061,17 @@ public class Plot {
                         }
                         TaskManager.runTask(whenDone);
                     };
+                    QueueCoordinator queue = getArea().getQueue();
                     for (Plot current : plots) {
                         if (isDelete || !current.hasOwner()) {
-                            manager.unClaimPlot(current, null);
+                            manager.unClaimPlot(current, null, queue);
                         } else {
-                            manager.claimPlot(current);
+                            manager.claimPlot(current, queue);
                         }
                     }
+                    if (queue.size() > 0) {
+                        queue.enqueue();
+                    }
                     TaskManager.runTask(run);
                     return;
                 }
@@ -1082,7 +1086,7 @@ public class Plot {
                     }
                     return;
                 }
-                manager.clearPlot(current, this);
+                manager.clearPlot(current, this, null);
             }
         };
         run.run();
@@ -1861,7 +1865,7 @@ public class Plot {
                 }
             });
         }
-        plotworld.getPlotManager().claimPlot(this);
+        plotworld.getPlotManager().claimPlot(this, null);
         return true;
     }
 
@@ -2074,8 +2078,11 @@ public class Plot {
     /**
      * Remove the east road section of a plot<br>
      * - Used when a plot is merged<br>
+     *
+     * @param queue Nullable {@link QueueCoordinator}. If null, creates own queue and enqueues,
+     *              otherwise writes to the queue but does not enqueue.
      */
-    public void removeRoadEast() {
+    public void removeRoadEast(@Nullable QueueCoordinator queue) {
         if (this.area.getType() != PlotAreaType.NORMAL && this.area.getTerrain() == PlotAreaTerrainType.ROAD) {
             Plot other = this.getRelative(Direction.EAST);
             Location bot = other.getBottomAbs();
@@ -2084,7 +2091,7 @@ public class Plot {
             Location pos2 = Location.at(this.getWorldName(), bot.getX(), MAX_HEIGHT, top.getZ());
             this.regionManager.regenerateRegion(pos1, pos2, true, null);
         } else if (this.area.getTerrain() != PlotAreaTerrainType.ALL) { // no road generated => no road to remove
-            this.area.getPlotManager().removeRoadEast(this);
+            this.area.getPlotManager().removeRoadEast(this, queue);
         }
     }
 
@@ -2440,8 +2447,11 @@ public class Plot {
     /**
      * Remove the south road section of a plot<br>
      * - Used when a plot is merged<br>
+     *
+     * @param queue Nullable {@link QueueCoordinator}. If null, creates own queue and enqueues,
+     *              otherwise writes to the queue but does not enqueue.
      */
-    public void removeRoadSouth() {
+    public void removeRoadSouth(@Nullable QueueCoordinator queue) {
         if (this.area.getType() != PlotAreaType.NORMAL && this.area.getTerrain() == PlotAreaTerrainType.ROAD) {
             Plot other = this.getRelative(Direction.SOUTH);
             Location bot = other.getBottomAbs();
@@ -2450,7 +2460,7 @@ public class Plot {
             Location pos2 = Location.at(this.getWorldName(), top.getX(), MAX_HEIGHT, bot.getZ());
             this.regionManager.regenerateRegion(pos1, pos2, true, null);
         } else if (this.area.getTerrain() != PlotAreaTerrainType.ALL) { // no road generated => no road to remove
-            this.getManager().removeRoadSouth(this);
+            this.getManager().removeRoadSouth(this, queue);
         }
     }
 
@@ -2474,6 +2484,7 @@ public class Plot {
         Plot current;
         boolean toReturn = false;
         HashSet<Plot> visited = new HashSet<>();
+        QueueCoordinator queue = getArea().getQueue();
         while ((current = frontier.poll()) != null && max >= 0) {
             if (visited.contains(current)) {
                 continue;
@@ -2484,7 +2495,7 @@ public class Plot {
                 Plot other = current.getRelative(Direction.NORTH);
                 if (other != null && other.isOwner(uuid) && (other.getBasePlot(false).equals(current.getBasePlot(false))
                     || (plots = other.getConnectedPlots()).size() <= max && frontier.addAll(plots) && (max -= plots.size()) != -1)) {
-                    current.mergePlot(other, removeRoads);
+                    current.mergePlot(other, removeRoads, queue);
                     merged.add(current.getId());
                     merged.add(other.getId());
                     toReturn = true;
@@ -2493,7 +2504,7 @@ public class Plot {
                         ArrayList<PlotId> ids = new ArrayList<>();
                         ids.add(current.getId());
                         ids.add(other.getId());
-                        this.getManager().finishPlotMerge(ids);
+                        this.getManager().finishPlotMerge(ids, queue);
                     }
                 }
             }
@@ -2501,7 +2512,7 @@ public class Plot {
                 Plot other = current.getRelative(Direction.EAST);
                 if (other != null && other.isOwner(uuid) && (other.getBasePlot(false).equals(current.getBasePlot(false))
                     || (plots = other.getConnectedPlots()).size() <= max && frontier.addAll(plots) && (max -= plots.size()) != -1)) {
-                    current.mergePlot(other, removeRoads);
+                    current.mergePlot(other, removeRoads, queue);
                     merged.add(current.getId());
                     merged.add(other.getId());
                     toReturn = true;
@@ -2510,7 +2521,7 @@ public class Plot {
                         ArrayList<PlotId> ids = new ArrayList<>();
                         ids.add(current.getId());
                         ids.add(other.getId());
-                        this.getManager().finishPlotMerge(ids);
+                        this.getManager().finishPlotMerge(ids, queue);
                     }
                 }
             }
@@ -2518,7 +2529,7 @@ public class Plot {
                 Plot other = current.getRelative(Direction.SOUTH);
                 if (other != null && other.isOwner(uuid) && (other.getBasePlot(false).equals(current.getBasePlot(false))
                     || (plots = other.getConnectedPlots()).size() <= max && frontier.addAll(plots) && (max -= plots.size()) != -1)) {
-                    current.mergePlot(other, removeRoads);
+                    current.mergePlot(other, removeRoads, queue);
                     merged.add(current.getId());
                     merged.add(other.getId());
                     toReturn = true;
@@ -2527,7 +2538,7 @@ public class Plot {
                         ArrayList<PlotId> ids = new ArrayList<>();
                         ids.add(current.getId());
                         ids.add(other.getId());
-                        this.getManager().finishPlotMerge(ids);
+                        this.getManager().finishPlotMerge(ids, queue);
                     }
                 }
             }
@@ -2535,7 +2546,7 @@ public class Plot {
                 Plot other = current.getRelative(Direction.WEST);
                 if (other != null && other.isOwner(uuid) && (other.getBasePlot(false).equals(current.getBasePlot(false))
                     || (plots = other.getConnectedPlots()).size() <= max && frontier.addAll(plots) && (max -= plots.size()) != -1)) {
-                    current.mergePlot(other, removeRoads);
+                    current.mergePlot(other, removeRoads, queue);
                     merged.add(current.getId());
                     merged.add(other.getId());
                     toReturn = true;
@@ -2544,10 +2555,13 @@ public class Plot {
                         ArrayList<PlotId> ids = new ArrayList<>();
                         ids.add(current.getId());
                         ids.add(other.getId());
-                        this.getManager().finishPlotMerge(ids);
+                        this.getManager().finishPlotMerge(ids, queue);
                     }
                 }
             }
+            if (queue.size() > 0) {
+                queue.enqueue();
+            }
         }
         return toReturn;
     }
@@ -2603,15 +2617,18 @@ public class Plot {
 
     /**
      * Remove the SE road (only effects terrain)
+     *
+     * @param queue Nullable {@link QueueCoordinator}. If null, creates own queue and enqueues,
+     *              otherwise writes to the queue but does not enqueue.
      */
-    public void removeRoadSouthEast() {
+    public void removeRoadSouthEast(@Nullable QueueCoordinator queue) {
         if (this.area.getType() != PlotAreaType.NORMAL && this.area.getTerrain() == PlotAreaTerrainType.ROAD) {
             Plot other = this.getRelative(1, 1);
             Location pos1 = this.getTopAbs().add(1, 0, 1).withY(0);
             Location pos2 = other.getBottomAbs().subtract(1, 0, 1).withY(MAX_HEIGHT);
             this.regionManager.regenerateRegion(pos1, pos2, true, null);
         } else if (this.area.getTerrain() != PlotAreaTerrainType.ALL) { // no road generated => no road to remove
-            this.area.getPlotManager().removeRoadSouthEast(this);
+            this.area.getPlotManager().removeRoadSouthEast(this, queue);
         }
     }
 
@@ -3088,10 +3105,10 @@ public class Plot {
     /**
      * Merges two plots. <br>- Assumes plots are directly next to each other <br> - saves to DB
      *
-     * @param lesserPlot
+     * @param queue Nullable {@link QueueCoordinator}. If null, creates own queue and enqueues,
-     * @param removeRoads
+     *              otherwise writes to the queue but does not enqueue.
      */
-    public void mergePlot(Plot lesserPlot, boolean removeRoads) {
+    public void mergePlot(Plot lesserPlot, boolean removeRoads, @Nullable QueueCoordinator queue) {
         Plot greaterPlot = this;
         lesserPlot.removeSign();
         if (lesserPlot.getId().getX() == greaterPlot.getId().getX()) {
@@ -3108,14 +3125,14 @@ public class Plot {
                 lesserPlot.mergeData(greaterPlot);
                 if (removeRoads) {
                     //lesserPlot.removeSign();
-                    lesserPlot.removeRoadSouth();
+                    lesserPlot.removeRoadSouth(queue);
                     Plot diagonal = greaterPlot.getRelative(Direction.EAST);
                     if (diagonal.getMerged(Direction.NORTHWEST)) {
-                        lesserPlot.removeRoadSouthEast();
+                        lesserPlot.removeRoadSouthEast(queue);
                     }
                     Plot below = greaterPlot.getRelative(Direction.WEST);
                     if (below.getMerged(Direction.NORTHEAST)) {
-                        below.getRelative(Direction.NORTH).removeRoadSouthEast();
+                        below.getRelative(Direction.NORTH).removeRoadSouthEast(queue);
                     }
                 }
             }
@@ -3135,17 +3152,16 @@ public class Plot {
                     //lesserPlot.removeSign();
                     Plot diagonal = greaterPlot.getRelative(Direction.SOUTH);
                     if (diagonal.getMerged(Direction.NORTHWEST)) {
-                        lesserPlot.removeRoadSouthEast();
+                        lesserPlot.removeRoadSouthEast(queue);
                     }
-                    lesserPlot.removeRoadEast();
+                    lesserPlot.removeRoadEast(queue);
                 }
                 Plot below = greaterPlot.getRelative(Direction.NORTH);
                 if (below.getMerged(Direction.SOUTHWEST)) {
-                    below.getRelative(Direction.WEST).removeRoadSouthEast();
+                    below.getRelative(Direction.WEST).removeRoadSouthEast(queue);
                 }
             }
         }
-
     }
 
     /**
@@ -3235,8 +3251,12 @@ public class Plot {
                             Plot plot = destination.getRelative(0, 0);
                             Plot originPlot = originArea.getPlotAbs(PlotId.of(plot.id.getX() - offset.getX(), plot.id.getY() - offset.getY()));
                             final Runnable clearDone = () -> {
+                                QueueCoordinator queue = getArea().getQueue();
                                 for (final Plot current : plot.getConnectedPlots()) {
-                                    getManager().claimPlot(current);
+                                    getManager().claimPlot(current, queue);
+                                }
+                                if (queue.size() > 0) {
+                                    queue.enqueue();
                                 }
                                 plot.setSign();
                                 TaskManager.runTask(whenDone);
@@ -3334,8 +3354,12 @@ public class Plot {
         Runnable run = new Runnable() {
             @Override public void run() {
                 if (regions.isEmpty()) {
+                    QueueCoordinator queue = getArea().getQueue();
                     for (Plot current : getConnectedPlots()) {
-                        destination.getManager().claimPlot(current);
+                        destination.getManager().claimPlot(current, queue);
+                    }
+                    if (queue.size() > 0) {
+                        queue.enqueue();
                     }
                     destination.setSign();
                     TaskManager.runTask(whenDone);

Core/src/main/java/com/plotsquared/core/plot/PlotArea.java

@@ -934,7 +934,8 @@ public abstract class PlotArea {
         final PlotId pos2 = plotIds.get(plotIds.size() - 1);
         final PlotManager manager = getPlotManager();
 
-        manager.startPlotMerge(plotIds);
+        QueueCoordinator queue = getQueue();
+        manager.startPlotMerge(plotIds, queue);
         final Set<UUID> trusted = new HashSet<>();
         final Set<UUID> members = new HashSet<>();
         final Set<UUID> denied = new HashSet<>();
@@ -969,24 +970,25 @@ public abstract class PlotArea {
                     if (ly) {
                         if (!plot.getMerged(Direction.EAST) || !plot.getMerged(Direction.SOUTH)) {
                             if (removeRoads) {
-                                plot.removeRoadSouthEast();
+                                plot.removeRoadSouthEast(queue);
                             }
                         }
                     }
                     if (!plot.getMerged(Direction.EAST)) {
                         plot2 = plot.getRelative(1, 0);
-                        plot.mergePlot(plot2, removeRoads);
+                        plot.mergePlot(plot2, removeRoads, queue);
                     }
                 }
                 if (ly) {
                     if (!plot.getMerged(Direction.SOUTH)) {
                         plot2 = plot.getRelative(0, 1);
-                        plot.mergePlot(plot2, removeRoads);
+                        plot.mergePlot(plot2, removeRoads, queue);
                     }
                 }
             }
         }
-        manager.finishPlotMerge(plotIds);
+        manager.finishPlotMerge(plotIds, queue);
+        queue.enqueue();
         return true;
     }
 

Core/src/main/java/com/plotsquared/core/plot/PlotManager.java

@@ -61,27 +61,16 @@ public abstract class PlotManager {
     // the same applies here
     public abstract Location getPlotTopLocAbs(@Nonnull PlotId plotId);
 
-    /*
-     * Plot clearing (return false if you do not support some method)
-     */
-    public boolean clearPlot(@Nonnull Plot plot, @Nullable Runnable whenDone) {
-        return clearPlot(plot, whenDone, null);
-    }
-
-    public boolean claimPlot(@Nonnull Plot plot) {
-        return claimPlot(plot, null);
-
-    }
-
-    public boolean unClaimPlot(@Nonnull Plot plot, @Nullable Runnable whenDone) {
-        return unClaimPlot(plot, whenDone, null);
-
-    }
-
     public abstract boolean clearPlot(@Nonnull Plot plot, @Nullable Runnable whenDone, @Nullable QueueCoordinator queue);
 
     public abstract boolean claimPlot(@Nonnull Plot plot, @Nullable QueueCoordinator queue);
 
+    /**
+     * Completes block changes associated with plot unclaim.
+     *
+     * @param queue Nullable {@link QueueCoordinator}. If null, creates own queue and enqueues,
+     *              otherwise writes to the queue but does not enqueue.
+     */
     public abstract boolean unClaimPlot(@Nonnull Plot plot, @Nullable Runnable whenDone, @Nullable QueueCoordinator queue);
 
     /**
@@ -98,77 +87,85 @@ public abstract class PlotManager {
      */
     public abstract String[] getPlotComponents(@Nonnull PlotId plotId);
 
-    public boolean setComponent(@Nonnull PlotId plotId, @Nonnull String component, @Nonnull Pattern blocks) {
+    /**
-        return setComponent(plotId, component, blocks, null);
+     * Set the specified components to the specified Pattern on the specified plot.
-    }
+     *
-
+     * @param component FLOOR, WALL, AIR, MAIN, MIDDLE, OUTLINE, BORDER, ALL (floor, air and main).
+     * @param queue     Nullable {@link QueueCoordinator}. If null, creates own queue and enqueues,
+     *                  otherwise writes to the queue but does not enqueue.
+     */
     public abstract boolean setComponent(@Nonnull PlotId plotId,
                                          @Nonnull String component,
                                          @Nonnull Pattern blocks,
                                          @Nullable QueueCoordinator queue);
 
-    /*
+    /**
-     * PLOT MERGING (return false if your generator does not support plot
+     * Create the road east of the plot (not schematic-based)
-     * merging).
+     *
+     * @param queue Nullable {@link QueueCoordinator}. If null, creates own queue and enqueues,
+     *              otherwise writes to the queue but does not enqueue.
      */
-    public boolean createRoadEast(@Nonnull Plot plot) {
-        return createRoadEast(plot, null);
-    }
-
-    public boolean createRoadSouth(@Nonnull Plot plot) {
-        return createRoadSouth(plot, null);
-    }
-
-    public boolean createRoadSouthEast(@Nonnull Plot plot) {
-        return createRoadSouthEast(plot, null);
-    }
-
-    public boolean removeRoadEast(@Nonnull Plot plot) {
-        return removeRoadEast(plot, null);
-    }
-
-    public boolean removeRoadSouth(@Nonnull Plot plot) {
-        return removeRoadSouth(plot, null);
-    }
-
-    public boolean removeRoadSouthEast(@Nonnull Plot plot) {
-        return removeRoadSouthEast(plot, null);
-    }
-
-    public boolean startPlotMerge(@Nonnull List<PlotId> plotIds) {
-        return startPlotMerge(plotIds, null);
-    }
-
-    public boolean startPlotUnlink(@Nonnull List<PlotId> plotIds) {
-        return startPlotUnlink(plotIds, null);
-    }
-
-    public boolean finishPlotMerge(@Nonnull List<PlotId> plotIds) {
-        return finishPlotMerge(plotIds, null);
-    }
-
-    public boolean finishPlotUnlink(@Nonnull List<PlotId> plotIds) {
-        return finishPlotUnlink(plotIds, null);
-    }
-
     public abstract boolean createRoadEast(@Nonnull Plot plot, @Nullable QueueCoordinator queue);
 
+    /**
+     * Create the road south of the plot (not schematic-based)
+     *
+     * @param queue Nullable {@link QueueCoordinator}. If null, creates own queue and enqueues,
+     *              otherwise writes to the queue but does not enqueue.
+     */
     public abstract boolean createRoadSouth(@Nonnull Plot plot, @Nullable QueueCoordinator queue);
 
+    /**
+     * Create the south-east corner of the road (intersection, not schematic-based)
+     *
+     * @param queue Nullable {@link QueueCoordinator}. If null, creates own queue and enqueues,
+     *              otherwise writes to the queue but does not enqueue.
+     */
     public abstract boolean createRoadSouthEast(@Nonnull Plot plot, @Nullable QueueCoordinator queue);
 
+    /**
+     * Replace the road to the east of the plot with standard plot blocks (for when merging plots)
+     *
+     * @param queue Nullable {@link QueueCoordinator}. If null, creates own queue and enqueues,
+     *              otherwise writes to the queue but does not enqueue.
+     */
     public abstract boolean removeRoadEast(@Nonnull Plot plot, @Nullable QueueCoordinator queue);
 
+    /**
+     * Replace the road to the south of the plot with standard plot blocks (for when merging plots)
+     *
+     * @param queue Nullable {@link QueueCoordinator}. If null, creates own queue and enqueues,
+     *              otherwise writes to the queue but does not enqueue.
+     */
     public abstract boolean removeRoadSouth(@Nonnull Plot plot, @Nullable QueueCoordinator queue);
 
+    /**
+     * Replace the road to the south east of the plot (intersection) with standard plot blocks (for when merging plots)
+     *
+     * @param queue Nullable {@link QueueCoordinator}. If null, creates own queue and enqueues,
+     *              otherwise writes to the queue but does not enqueue.
+     */
     public abstract boolean removeRoadSouthEast(@Nonnull Plot plot, @Nullable QueueCoordinator queue);
 
     public abstract boolean startPlotMerge(@Nonnull List<PlotId> plotIds, @Nullable QueueCoordinator queue);
 
     public abstract boolean startPlotUnlink(@Nonnull List<PlotId> plotIds, @Nullable QueueCoordinator queue);
 
+    /**
+     * Finishing off plot merging by adding in the walls surrounding the plot (OPTIONAL)(UNFINISHED).
+     *
+     * @param queue Nullable {@link QueueCoordinator}. If null, creates own queue and enqueues,
+     *              otherwise writes to the queue but does not enqueue.
+     * @return false if part if the merge failed, otherwise true if successful.
+     */
     public abstract boolean finishPlotMerge(@Nonnull List<PlotId> plotIds, @Nullable QueueCoordinator queue);
 
+    /**
+     * Finished off an unlink by resetting the top wall block for unlinked plots
+     *
+     * @param queue Nullable {@link QueueCoordinator}. If null, creates own queue and enqueues,
+     *              otherwise writes to the queue but does not enqueue.
+     */
     public abstract boolean finishPlotUnlink(@Nonnull List<PlotId> plotIds, @Nullable QueueCoordinator queue);
 
     public void exportTemplate() throws IOException {
@@ -184,12 +181,10 @@ public abstract class PlotManager {
     /**
      * Sets all the blocks along all the plot walls to their correct state (claimed or unclaimed).
      *
+     * @param queue Nullable {@link QueueCoordinator}. If null, creates own queue and enqueues,
+     *              otherwise writes to the queue but does not enqueue.
      * @return true if the wall blocks were successfully set
      */
-    public boolean regenerateAllPlotWalls() {
-        return regenerateAllPlotWalls(null);
-    }
-
     public boolean regenerateAllPlotWalls(@Nullable QueueCoordinator queue) {
         boolean success = true;
         for (Plot plot : plotArea.getPlots()) {

Core/src/main/java/com/plotsquared/core/util/RegionManager.java

@@ -95,6 +95,13 @@ public abstract class RegionManager {
         });
     }
 
+    /**
+     * Set a number of cuboids to a certain block between two y values.
+     *
+     * @param queue Nullable {@link QueueCoordinator}. If null, creates own queue and enqueues,
+     *              otherwise writes to the queue but does not enqueue.
+     * @return true if not enqueued, otherwise whether the created queue enqueued.
+     */
     public boolean setCuboids(final PlotArea area,
                               final Set<CuboidRegion> regions,
                               final Pattern blocks,