Added ability to limit amount of requested tracks per user.

src/main/java/dev/logal/logalbot/audio/TrackScheduler.java

@@ -123,6 +123,16 @@ public final class TrackScheduler extends AudioEventAdapter {
         Collections.shuffle(this.queue);
     }
 
+    public final int occupiedSlotCount(Member member) {
+        int count = 0;
+        for (RequestedTrack requestedTrack : this.queue) {
+            if (requestedTrack.getRequester().equals(member)) {
+                count++;
+            }
+        }
+        return count;
+    }
+
     public final LinkedList<RequestedTrack> getQueue() {
         return this.queue;
     }

src/main/java/dev/logal/logalbot/commands/administration/Settings.java

@@ -32,7 +32,7 @@ public final class Settings implements Command {
         final Guild guild = executor.getGuild();
 
         if (arguments.length == 0) {
-            final CommandResponse response = new CommandResponse("tools",
+            final CommandResponse response = new CommandResponse("wrench",
                     executor.getAsMention() + ", these are the current settings for this guild:");
             final EmbedBuilder builder = new EmbedBuilder();
             builder.setTitle("**Current Settings for " + StringUtil.sanitize(guild.getName()) + "**");
@@ -50,6 +50,14 @@ public final class Settings implements Command {
             } else {
                 builder.addField("Default Volume", defaultVolume + "%", true);
             }
+
+            final String maxSlots = DataManager.getGuildValue(guild, "maximumSlots");
+            if (maxSlots == null) {
+                builder.addField("Maximum Queue Slots Per User", "Unlimited", true);
+            } else {
+                builder.addField("Maximum Queue Slots Per User", maxSlots, true);
+            }
+
             response.attachEmbed(builder.build());
             return response;
         }
@@ -114,6 +122,33 @@ public final class Settings implements Command {
                                             TimeUnit.SECONDS);
                 }
             }
+        } else if (arguments[0].equalsIgnoreCase("maximumSlots")) {
+            final int maxSlots;
+            try {
+                maxSlots = Integer.parseInt(arguments[1]);
+            } catch (final NumberFormatException exception) {
+                return new CommandResponse("no_entry_sign",
+                        "Sorry " + executor.getAsMention()
+                                + ", but the maximum amount of queue slots per user must be an integer.")
+                                        .setDeletionDelay(10, TimeUnit.SECONDS);
+            }
+
+            if (maxSlots == 0) {
+                DataManager.deleteGuildKey(guild, "maximumSlots");
+                return new CommandResponse("white_check_mark", executor.getAsMention()
+                        + ", the maximum amount of queue slots per user has been reset to unlimited.");
+            }
+
+            if (maxSlots <= 249 && maxSlots >= 1) {
+                DataManager.setGuildValue(guild, "maximumSlots", "" + maxSlots);
+                return new CommandResponse("white_check_mark", executor.getAsMention()
+                        + ", the maximum amount of queue slots per user has been set to `" + maxSlots + "`.");
+            } else {
+                return new CommandResponse("no_entry_sign",
+                        "Sorry " + executor.getAsMention()
+                                + ", but the maximum amount of queue slots per user must be between 1 and 249.")
+                                        .setDeletionDelay(10, TimeUnit.SECONDS);
+            }
         } else {
             return new CommandResponse("no_entry_sign",
                     "Sorry " + executor.getAsMention() + ", but I do not know what that setting is.")

src/main/java/dev/logal/logalbot/commands/audio/Play.java

@@ -22,6 +22,7 @@ import dev.logal.logalbot.audio.TrackScheduler;
 import dev.logal.logalbot.commands.Command;
 import dev.logal.logalbot.commands.CommandResponse;
 import dev.logal.logalbot.utils.AudioUtil;
+import dev.logal.logalbot.utils.DataManager;
 import dev.logal.logalbot.utils.PermissionManager;
 import dev.logal.logalbot.utils.VoiceChannelUtil;
 import net.dv8tion.jda.core.Permission;
@@ -76,6 +77,17 @@ public final class Play implements Command {
                     .setDeletionDelay(10, TimeUnit.SECONDS);
         }
 
+        try {
+            final int maxSlots = Integer.parseInt(DataManager.getGuildValue(guild, "maximumSlots"));
+
+            if ((scheduler.occupiedSlotCount(executor) >= maxSlots) && !PermissionManager.isWhitelisted(executor)) {
+                return new CommandResponse("no_entry_sign", "Sorry " + executor.getAsMention()
+                        + ", you cannot request more than " + maxSlots + " tracks at the same time.")
+                                .setDeletionDelay(10, TimeUnit.SECONDS);
+            }
+        } catch (final NumberFormatException exception) {
+        }
+
         boolean isLink;
         try {
             new URL(arguments[0]);