Moves player logic to its own class, away from Interface

In the future, this will make testing and a CLI environment easier.

interface/build.gradle

@@ -44,5 +44,5 @@ sourceCompatibility = JavaVersion.VERSION_16
 targetCompatibility = JavaVersion.VERSION_16
 
 // Define the main class for the application
-mainClassName = defaultPackage + '.player.Interface'
+mainClassName = defaultPackage + '.gui.Interface'
 //mainClassName = defaultPackage + '.localPlayer.Player'

interface/src/main/java/edu/regis/universeplayer/ConfigManager.java

@@ -0,0 +1,93 @@
+package edu.regis.universeplayer;
+
+import net.harawata.appdirs.AppDirsFactory;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.File;
+
+public class ConfigManager
+{
+    private static final Logger logger = LoggerFactory
+            .getLogger(ConfigManager.class);
+
+    private static File dataDir;
+    private static File commDir;
+    private static File configDir;
+    /**
+     * Obtains the data storage directory for the application, creating it if
+     * needed.
+     *
+     * @return The data storage directory.
+     */
+    public static File getDataDir()
+    {
+        if (dataDir == null)
+        {
+            dataDir = new File(AppDirsFactory.getInstance()
+                                             .getUserDataDir("universalmusic", null, null, true));
+            if (!dataDir.exists())
+            {
+                if (!dataDir.mkdir())
+                {
+                    logger.error("Could not create data directory {}", dataDir);
+                }
+            }
+        }
+        return dataDir;
+    }
+
+    /**
+     * Obtains the configuration directory for the application, creating it if
+     * needed.
+     *
+     * @return The configuration directory.
+     */
+    public static File getConfigDir()
+    {
+        if (configDir == null)
+        {
+            configDir = new File(AppDirsFactory.getInstance()
+                                               .getUserConfigDir("universalmusic", null, null, true));
+            if (!configDir.exists())
+            {
+                if (!configDir.mkdir())
+                {
+                    logger.error("Could not create configuration directory {}", configDir);
+                }
+            }
+        }
+        return configDir;
+    }
+
+    /**
+     * Obtains the directory for memory mapped files
+     *
+     * @return The communications storage directory.
+     */
+    public static File getCommDir()
+    {
+        if (commDir == null)
+        {
+            commDir = new File(AppDirsFactory.getInstance()
+                                             .getSharedDir("universalmusic", null, null), "comm");
+            if (!commDir.getParentFile().exists())
+            {
+                if (!commDir.getParentFile().mkdir())
+                {
+                    logger.error("Could not create shared directory {}", commDir
+                            .getParent());
+                }
+            }
+            if (!commDir.exists())
+            {
+                if (!commDir.mkdir())
+                {
+                    logger.error("Could not create data directory {}", commDir);
+                }
+            }
+        }
+        return commDir;
+    }
+}

interface/src/main/java/edu/regis/universeplayer/data/DatabaseManager.java

@@ -4,7 +4,8 @@
 
 package edu.regis.universeplayer.data;
 
-import edu.regis.universeplayer.player.Interface;
+import edu.regis.universeplayer.ConfigManager;
+
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -30,7 +31,8 @@ public class DatabaseManager
             if (db == null || db.isClosed())
             {
                 Class.forName("org.sqlite.JDBC");
-                db = DriverManager.getConnection("jdbc:sqlite:" + new File(Interface.getDataDir().getAbsolutePath(), "universalmusic.db").getAbsolutePath());
+                db = DriverManager.getConnection("jdbc:sqlite:" + new File(ConfigManager
+                        .getDataDir().getAbsolutePath(), "universalmusic.db").getAbsolutePath());
             }
             warning = db.getWarnings();
             while (warning != null)

interface/src/main/java/edu/regis/universeplayer/data/LocalSongProvider.java

@@ -4,8 +4,6 @@
 
 package edu.regis.universeplayer.data;
 
-import edu.regis.universeplayer.player.Interface;
-
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 

interface/src/main/java/edu/regis/universeplayer/data/PlaybackEvent.java

@@ -5,8 +5,7 @@
 package edu.regis.universeplayer.data;
 
 import edu.regis.universeplayer.PlaybackInfo;
-import edu.regis.universeplayer.Player;
+import edu.regis.universeplayer.player.Player;
-import edu.regis.universeplayer.localPlayer.LocalPlayer;
 
 import java.util.EventObject;
 

interface/src/main/java/edu/regis/universeplayer/gui/AlbumInfo.java

@@ -2,7 +2,7 @@
  * Copyright (c) 2021 William Hubbard. All Rights Reserved.
  */
 
-package edu.regis.universeplayer.player;
+package edu.regis.universeplayer.gui;
 
 import javax.swing.*;
 import javax.swing.border.LineBorder;

interface/src/main/java/edu/regis/universeplayer/gui/CollectionList.java

@@ -2,7 +2,7 @@
  * Copyright (c) 2021 William Hubbard. All Rights Reserved.
  */
 
-package edu.regis.universeplayer.player;
+package edu.regis.universeplayer.gui;
 
 import java.awt.*;
 import java.awt.event.FocusAdapter;
@@ -14,7 +14,7 @@ import java.util.stream.Collectors;
 import javax.swing.*;
 
 import com.wordpress.tips4java.ScrollablePanel;
-import edu.regis.universeplayer.ClickListener;
+
 import edu.regis.universeplayer.data.Album;
 import edu.regis.universeplayer.data.CollectionType;
 import edu.regis.universeplayer.data.Song;

interface/src/main/java/edu/regis/universeplayer/gui/Collections.java

@@ -2,11 +2,10 @@
  * Copyright (c) 2021 William Hubbard. All Rights Reserved.
  */
 
-package edu.regis.universeplayer.player;
+package edu.regis.universeplayer.gui;
 
 import java.awt.*;
 import java.awt.event.*;
-import java.util.ArrayList;
 import java.util.Collection;
 import java.util.LinkedList;
 import java.util.Locale;
@@ -16,7 +15,6 @@ import javax.swing.*;
 
 import edu.regis.universeplayer.data.CollectionType;
 import edu.regis.universeplayer.data.Song;
-import edu.regis.universeplayer.data.SongProvider;
 
 /**
  * This panel links to various song collections the player has set up.

interface/src/main/java/edu/regis/universeplayer/gui/FocusManager.java

@@ -2,7 +2,7 @@
  * Copyright (c) 2021 William Hubbard. All Rights Reserved.
  */
 
-package edu.regis.universeplayer.player;
+package edu.regis.universeplayer.gui;
 
 import java.awt.*;
 

interface/src/main/java/edu/regis/universeplayer/gui/Interface.java

@@ -2,19 +2,17 @@
  * Copyright (c) 2021 William Hubbard. All Rights Reserved.
  */
 
-package edu.regis.universeplayer.player;
+package edu.regis.universeplayer.gui;
 
-import edu.regis.universeplayer.Player;
+import edu.regis.universeplayer.player.Player;
 import edu.regis.universeplayer.browser.Browser;
-import edu.regis.universeplayer.browser.BrowserPlayer;
+import edu.regis.universeplayer.player.BrowserPlayer;
-import edu.regis.universeplayer.browserCommands.CommandError;
 import edu.regis.universeplayer.browserCommands.QueryFuture;
 import edu.regis.universeplayer.data.InternetSong;
 import edu.regis.universeplayer.data.Queue;
 import edu.regis.universeplayer.data.*;
-import edu.regis.universeplayer.localPlayer.LocalPlayer;
+import edu.regis.universeplayer.player.LocalPlayer;
-
+import edu.regis.universeplayer.player.PlayerManager;
-import net.harawata.appdirs.AppDirsFactory;
 
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -23,7 +21,6 @@ import javax.swing.*;
 
 import java.awt.*;
 import java.awt.event.*;
-import java.io.File;
 import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Collection;
@@ -51,10 +48,6 @@ public class Interface extends JFrame implements SongDisplayListener, ComponentL
 
     private static Interface INSTANCE;
 
-    private static File dataDir;
-    private static File commDir;
-    private static File configDir;
-
     public final ActionMap actions = new ActionMap();
 
     /**
@@ -82,10 +75,6 @@ public class Interface extends JFrame implements SongDisplayListener, ComponentL
      */
     private final PlayerControls controls;
 
-    /**
-     * A link to the browser.
-     */
-    private final ArrayList<Player<?>> players = new ArrayList<>();
     private int currentPlayer = -1;
 
     public static Interface getInstance()
@@ -95,10 +84,8 @@ public class Interface extends JFrame implements SongDisplayListener, ComponentL
 
     public static void main(String[] args)
     {
-        Thread browserThread;
         Interface inter = null;
-        Browser browser;
+        PlayerManager.getPlayers();
-        BrowserPlayer browserPlayer;
         try
         {
             /*
@@ -112,51 +99,6 @@ public class Interface extends JFrame implements SongDisplayListener, ComponentL
             inter.setSize(700, 500);
             SongProvider.INSTANCE.addUpdateListener(inter);
             inter.setVisible(true);
-
-            browser = Browser.createBrowser();
-            browserThread = new Thread(browser);
-            browserThread.start();
-
-            Player.REGISTERED_PLAYERS.put(LocalSong.class, new LocalPlayer());
-
-            try
-            {
-                inter.players.add(browserPlayer = new BrowserPlayer());
-                logger.debug("Sending ping");
-                browser.sendObject("ping");
-                Runtime.getRuntime()
-                       .addShutdownHook(new Thread(browserPlayer::close));
-                Player.REGISTERED_PLAYERS
-                        .put(InternetSong.class, browserPlayer);
-
-//                LinkedList<Future<Object>> pingRequests = new LinkedList<>();
-//                for (int i = 0; i < 20; i++)
-//                {
-//                    logger.info("Sending ping");
-//                    pingRequests.add(browser.sendObject("ping"));
-//                }
-//
-//                LinkedList<Future<Object>> toRemove = new LinkedList<>();
-//                while (pingRequests.size() > 0)
-//                {
-//                    for (Future<Object> future : pingRequests)
-//                    {
-//                        if (future.isDone())
-//                        {
-//                            logger.info("Receiving {}", future.get());
-//                            toRemove.add(future);
-//                        }
-//                    }
-//                    pingRequests.removeAll(toRemove);
-//                    toRemove.clear();
-//                }
-            }
-            catch (IOException e)
-            {
-                logger.error("Could not open browser background", e);
-                JOptionPane.showMessageDialog(inter, e, langs
-                        .getString("error.browser.launch"), JOptionPane.ERROR_MESSAGE);
-            }
         }
         catch (Throwable e)
         {
@@ -168,82 +110,6 @@ public class Interface extends JFrame implements SongDisplayListener, ComponentL
         }
     }
 
-    /**
-     * Obtains the data storage directory for the application, creating it if
-     * needed.
-     *
-     * @return The data storage directory.
-     */
-    public static File getDataDir()
-    {
-        if (dataDir == null)
-        {
-            dataDir = new File(AppDirsFactory.getInstance()
-                                             .getUserDataDir("universalmusic", null, null, true));
-            if (!dataDir.exists())
-            {
-                if (!dataDir.mkdir())
-                {
-                    logger.error("Could not create data directory {}", dataDir);
-                }
-            }
-        }
-        return dataDir;
-    }
-
-    /**
-     * Obtains the configuration directory for the application, creating it if
-     * needed.
-     *
-     * @return The configuration directory.
-     */
-    public static File getConfigDir()
-    {
-        if (configDir == null)
-        {
-            configDir = new File(AppDirsFactory.getInstance()
-                                               .getUserConfigDir("universalmusic", null, null, true));
-            if (!configDir.exists())
-            {
-                if (!configDir.mkdir())
-                {
-                    logger.error("Could not create configuration directory {}", configDir);
-                }
-            }
-        }
-        return configDir;
-    }
-
-    /**
-     * Obtains the directory for memory mapped files
-     *
-     * @return The communications storage directory.
-     */
-    public static File getCommDir()
-    {
-        if (commDir == null)
-        {
-            commDir = new File(AppDirsFactory.getInstance()
-                                             .getSharedDir("universalmusic", null, null), "comm");
-            if (!commDir.getParentFile().exists())
-            {
-                if (!commDir.getParentFile().mkdir())
-                {
-                    logger.error("Could not create shared directory {}", commDir
-                            .getParent());
-                }
-            }
-            if (!commDir.exists())
-            {
-                if (!commDir.mkdir())
-                {
-                    logger.error("Could not create data directory {}", commDir);
-                }
-            }
-        }
-        return commDir;
-    }
-
     /**
      * Creates an interface
      */
@@ -396,20 +262,10 @@ public class Interface extends JFrame implements SongDisplayListener, ComponentL
                                 @Override
                                 protected Void doInBackground() throws Exception
                                 {
-                                    Interface.this.players.stream()
+                                    QueryFuture<Void> command = PlayerManager.getPlayers().throwError(false);
-                                                          .filter(p -> p instanceof BrowserPlayer)
-                                                          .map(p -> (BrowserPlayer) p)
-                                                          .findFirst()
-                                                          .ifPresentOrElse(p -> {
-                                                              logger.debug("Throwing " +
-                                                                      "error");
-                                                              QueryFuture<Void> command = p
-                                                                      .throwError((false));
                                     try
                                     {
-                                                                  if (!command
+                                        if (!command.getConfirmation().wasSuccessful())
-                                                                          .getConfirmation()
-                                                                          .wasSuccessful())
                                         {
                                             logger.error("Could not run command",
                                                     command.getConfirmation()
@@ -435,10 +291,6 @@ public class Interface extends JFrame implements SongDisplayListener, ComponentL
                                                         .getString(
                                                                 "error.command"), JOptionPane.ERROR_MESSAGE);
                                     }
-                                                          }, () -> JOptionPane
-                                                                  .showMessageDialog(Interface.this, langs
-                                                                          .getString("error.browser.null"), langs
-                                                                          .getString("error.debug.error"), JOptionPane.ERROR_MESSAGE));
                                     return null;
                                 }
                             }.execute();
@@ -578,7 +430,7 @@ public class Interface extends JFrame implements SongDisplayListener, ComponentL
             {
                 if (this.isEnabled())
                 {
-                    controls.play();
+                    PlayerManager.getPlayers().play();
                 }
             }
         });
@@ -591,7 +443,7 @@ public class Interface extends JFrame implements SongDisplayListener, ComponentL
             {
                 if (this.isEnabled())
                 {
-                    controls.pause();
+                    PlayerManager.getPlayers().pause();
                 }
             }
         });
@@ -604,7 +456,7 @@ public class Interface extends JFrame implements SongDisplayListener, ComponentL
             {
                 if (this.isEnabled())
                 {
-                    controls.togglePlayback();
+                    PlayerManager.getPlayers().toggle();
                 }
             }
         });
@@ -796,7 +648,7 @@ public class Interface extends JFrame implements SongDisplayListener, ComponentL
     @Override
     public void windowClosing(WindowEvent windowEvent)
     {
-        this.players.forEach(Player::close);
+        PlayerManager.getPlayers().shutdownPlayers();
     }
 
     @Override

interface/src/main/java/edu/regis/universeplayer/gui/InternetSongDialog.java

@@ -2,7 +2,7 @@
  * Copyright (c) 2021 William Hubbard. All Rights Reserved.
  */
 
-package edu.regis.universeplayer.player;
+package edu.regis.universeplayer.gui;
 
 import edu.regis.universeplayer.data.InternetSong;
 import edu.regis.universeplayer.data.InternetSongProvider;

interface/src/main/java/edu/regis/universeplayer/gui/LogWindow.java

@@ -1,6 +1,5 @@
-package edu.regis.universeplayer.player;
+package edu.regis.universeplayer.gui;
 
-import org.apache.logging.log4j.Level;
 import org.apache.logging.log4j.core.LogEvent;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -8,9 +7,7 @@ import org.slf4j.LoggerFactory;
 import java.awt.BorderLayout;
 import java.awt.Color;
 import java.awt.FlowLayout;
-import java.awt.Rectangle;
 import java.awt.event.ActionEvent;
-import java.awt.event.ActionListener;
 import java.awt.event.MouseAdapter;
 import java.awt.event.MouseEvent;
 import java.awt.event.WindowAdapter;
@@ -18,16 +15,10 @@ import java.awt.event.WindowEvent;
 import java.util.Comparator;
 import java.util.Formatter;
 import java.util.HashMap;
-import java.util.LinkedHashMap;
-import java.util.List;
 import java.util.Locale;
-import java.util.MissingResourceException;
-import java.util.Objects;
 import java.util.Optional;
 import java.util.ResourceBundle;
 import java.util.Set;
-import java.util.stream.Collectors;
-import java.util.stream.Stream;
 
 import javax.swing.AbstractAction;
 import javax.swing.Box;

interface/src/main/java/edu/regis/universeplayer/gui/PlaybackCommand.java

@@ -2,7 +2,7 @@
  * Copyright (c) 2021 William Hubbard. All Rights Reserved.
  */
 
-package edu.regis.universeplayer.player;
+package edu.regis.universeplayer.gui;
 
 /**
  * Contains possible playback commands that the play can send.

interface/src/main/java/edu/regis/universeplayer/gui/PlaybackCommandListener.java

@@ -2,7 +2,7 @@
  * Copyright (c) 2021 William Hubbard. All Rights Reserved.
  */
 
-package edu.regis.universeplayer.player;
+package edu.regis.universeplayer.gui;
 
 import java.util.EventListener;
 

interface/src/main/java/edu/regis/universeplayer/gui/PlayerControls.java

@@ -2,18 +2,17 @@
  * Copyright (c) 2021 William Hubbard. All Rights Reserved.
  */
 
-package edu.regis.universeplayer.player;
+package edu.regis.universeplayer.gui;
 
-import edu.regis.universeplayer.PlaybackInfo;
 import edu.regis.universeplayer.PlaybackListener;
 import edu.regis.universeplayer.PlaybackStatus;
-import edu.regis.universeplayer.Player;
+import edu.regis.universeplayer.player.Player;
 import edu.regis.universeplayer.browserCommands.CommandConfirmation;
-import edu.regis.universeplayer.browserCommands.CommandReturn;
 import edu.regis.universeplayer.browserCommands.QueryFuture;
 import edu.regis.universeplayer.data.PlaybackEvent;
 import edu.regis.universeplayer.data.Queue;
 import edu.regis.universeplayer.data.Song;
+import edu.regis.universeplayer.player.PlayerManager;
 
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -46,12 +45,6 @@ public class PlayerControls extends JPanel implements Queue.SongChangeListener,
             .getBundle("lang.interface", Locale.getDefault());
     private final ImageIcon PLAY_ICON, PAUSE_ICON;
 
-    /**
-     * A reference to the song currently playing.
-     */
-    private Song currentSong = null;
-    private Player currentPlayer = null;
-
     private final JButton playButton;
     private final JButton nextButton;
     private final JButton prevButton;
@@ -183,33 +176,34 @@ public class PlayerControls extends JPanel implements Queue.SongChangeListener,
         layout.putConstraint(SpringLayout.SOUTH, this, 5, SpringLayout.SOUTH, this.updateProgress);
 
         Queue.getInstance().addSongChangeListener(this);
+        PlayerManager.getPlayers().addPlaybackListener(this);
     }
 
     private void seek(float value)
     {
         this.service.execute(() -> {
-            if (this.currentPlayer != null)
+            QueryFuture<Void> command = PlayerManager.getPlayers().seek(value);
-            {
-                QueryFuture<Void> command = this.currentPlayer.seek(value);
             try
             {
-                    if (!command.getConfirmation().wasSuccessful())
+                if (command != null && !command.getConfirmation()
+                                               .wasSuccessful())
                 {
+                    logger.error("Could not run command",
+                            command.getConfirmation().getError());
                     JOptionPane.showMessageDialog(this,
                             command.getConfirmation().getError(),
                             command.getConfirmation().getMessage(),
                             JOptionPane.ERROR_MESSAGE);
-                        logger.error("Could not run command",
-                                command.getConfirmation().getError());
                 }
             }
             catch (ExecutionException | InterruptedException e)
             {
-                    logger.error("Could not run command", e);
+                logger.error("Could not run command",
-                    JOptionPane.showMessageDialog(this, e.getMessage(), langs
+                        e);
-                            .getString(
+                JOptionPane.showMessageDialog(this,
-                                    "error.command"), JOptionPane.ERROR_MESSAGE);
+                        e,
-                }
+                        e.getMessage(),
+                        JOptionPane.ERROR_MESSAGE);
             }
         });
         this.triggerCommandListeners(PlaybackCommand.SEEK, value);
@@ -219,17 +213,16 @@ public class PlayerControls extends JPanel implements Queue.SongChangeListener,
     {
         this.service.execute(() -> {
             try
-            {
-                if (this.currentPlayer != null)
             {
                 QueryFuture<PlaybackStatus> status =
-                            this.currentPlayer.getStatus();
+                        PlayerManager.getPlayers().getStatus();
                 CommandConfirmation confirmation = status.getConfirmation();
                 if (status.getConfirmation().wasSuccessful())
                 {
                     switch (status.get())
                     {
-                        case PAUSED -> confirmation = this.currentPlayer.play()
+                    case PAUSED -> confirmation = PlayerManager.getPlayers()
+                                                               .play()
                                                                .getConfirmation();
                     case STOPPED, EMPTY -> {
                         if (Queue.getInstance().size() > 0)
@@ -241,7 +234,7 @@ public class PlayerControls extends JPanel implements Queue.SongChangeListener,
                             }
                             else
                             {
-                                    confirmation = this.currentPlayer.play()
+                                confirmation = PlayerManager.getPlayers().play()
                                                             .getConfirmation();
                             }
                         }
@@ -250,13 +243,12 @@ public class PlayerControls extends JPanel implements Queue.SongChangeListener,
                 }
                 if (confirmation != null && !confirmation.wasSuccessful())
                 {
+                    logger.error("Could not run command",
+                            confirmation.getError());
                     JOptionPane.showMessageDialog(this,
                             confirmation.getError(),
                             confirmation.getMessage(),
                             JOptionPane.ERROR_MESSAGE);
-                        logger.error("Could not run command",
-                                confirmation.getError());
-                    }
                 }
             }
             catch (ExecutionException | InterruptedException e)
@@ -274,29 +266,27 @@ public class PlayerControls extends JPanel implements Queue.SongChangeListener,
     {
         this.service.execute(() -> {
             try
-            {
-                if (this.currentPlayer != null)
             {
                 QueryFuture<PlaybackStatus> status =
-                            this.currentPlayer.getStatus();
+                        PlayerManager.getPlayers().getStatus();
                 CommandConfirmation confirmation = status.getConfirmation();
                 if (status.getConfirmation().wasSuccessful())
                 {
                     switch (status.get())
                     {
                     case PLAYING -> confirmation =
-                                this.currentPlayer.pause().getConfirmation();
+                            PlayerManager.getPlayers().pause()
+                                         .getConfirmation();
                     }
                 }
                 if (confirmation != null && !confirmation.wasSuccessful())
                 {
+                    logger.error("Could not run command",
+                            confirmation.getError());
                     JOptionPane.showMessageDialog(this,
                             confirmation.getError(),
                             confirmation.getMessage(),
                             JOptionPane.ERROR_MESSAGE);
-                        logger.error("Could not run command",
-                                confirmation.getError());
-                    }
                 }
             }
             catch (ExecutionException | InterruptedException e)
@@ -317,19 +307,19 @@ public class PlayerControls extends JPanel implements Queue.SongChangeListener,
     {
         this.service.execute(() -> {
             try
-            {
-                if (this.currentPlayer != null)
             {
                 QueryFuture<PlaybackStatus> status =
-                            this.currentPlayer.getStatus();
+                        PlayerManager.getPlayers().getStatus();
                 CommandConfirmation confirmation = status.getConfirmation();
                 if (status.getConfirmation().wasSuccessful())
                 {
                     switch (status.get())
                     {
-                        case PAUSED -> confirmation = this.currentPlayer.play()
+                    case PAUSED -> confirmation = PlayerManager.getPlayers()
+                                                               .play()
                                                                .getConfirmation();
-                        case PLAYING -> confirmation = this.currentPlayer.pause()
+                    case PLAYING -> confirmation = PlayerManager.getPlayers()
+                                                                .pause()
                                                                 .getConfirmation();
                     case STOPPED, EMPTY -> {
                         if (Queue.getInstance().size() > 0)
@@ -341,7 +331,7 @@ public class PlayerControls extends JPanel implements Queue.SongChangeListener,
                             }
                             else
                             {
-                                    confirmation = this.currentPlayer.play()
+                                confirmation = PlayerManager.getPlayers().play()
                                                             .getConfirmation();
                             }
                         }
@@ -358,7 +348,6 @@ public class PlayerControls extends JPanel implements Queue.SongChangeListener,
                             confirmation.getError());
                 }
             }
-            }
             catch (ExecutionException | InterruptedException e)
             {
                 logger.error("Could not get current playback status", e);
@@ -449,15 +438,25 @@ public class PlayerControls extends JPanel implements Queue.SongChangeListener,
 
     @Override
     public void onSongChange(Queue queue)
-    {
-        if (this.currentSong != null)
-        {
-            if (this.currentPlayer != null)
     {
         this.service.execute(() -> {
-                    QueryFuture<Void> command = this.currentPlayer.stopSong();
+            QueryFuture<Void> command = PlayerManager.getPlayers().stopSong();
             try
             {
+                if (command != null && !command.getConfirmation().wasSuccessful())
+                {
+                    JOptionPane.showMessageDialog(this,
+                            command.getConfirmation().getError(),
+                            command.getConfirmation().getMessage(),
+                            JOptionPane.ERROR_MESSAGE);
+                    logger.error("Could not run command",
+                            command.getConfirmation().getError());
+                }
+                else
+                {
+                    command =
+                            PlayerManager.getPlayers()
+                                         .playSong(queue.getCurrentSong());
                     if (!command.getConfirmation().wasSuccessful())
                     {
                         JOptionPane.showMessageDialog(this,
@@ -467,76 +466,31 @@ public class PlayerControls extends JPanel implements Queue.SongChangeListener,
                         logger.error("Could not run command",
                                 command.getConfirmation().getError());
                     }
-                    }
+                    else
-                    catch (ExecutionException | InterruptedException e)
                     {
-                        logger.error("Could not get current playback status", e);
+                        SwingUtilities.invokeLater(() -> {
-                        JOptionPane
-                                .showMessageDialog(this, e.getMessage(), langs
-                                        .getString(
-                                                "error.command"), JOptionPane.ERROR_MESSAGE);
-                    }
-                });
-            }
-        }
-        this.currentSong = queue.getCurrentSong();
                             this.playButton.setIcon(PLAY_ICON);
-        if (this.currentSong != null)
+                            this.progress.setMaximum((int) (PlayerManager
-        {
+                                    .getPlayers()
-            this.currentPlayer = Player.REGISTERED_PLAYERS
+                                    .getCurrentSong().duration / 1000));
-                    .get(this.currentSong.getClass());
-            this.progress.setMaximum((int) (this.currentSong.duration / 1000));
-            if (this.currentPlayer != null)
-            {
-                if (!this.currentPlayer.hasPlaybackListener(this))
-                {
-                    this.currentPlayer.addPlaybackListener(this);
-                }
-                this.service.execute(() -> {
-                    QueryFuture<Void> command =
-                            this.currentPlayer.loadSong(this.currentSong);
-                    try
-                    {
-                        if (!command.getConfirmation().wasSuccessful())
-                        {
-                            JOptionPane.showMessageDialog(this,
-                                    command.getConfirmation().getError(),
-                                    command.getConfirmation().getMessage(),
-                                    JOptionPane.ERROR_MESSAGE);
-                            logger.error("Could not run command",
-                                    command.getConfirmation().getError());
-                        }
-                    }
-                    catch (ExecutionException | InterruptedException e)
-                    {
-                        logger.error("Could not get current playback status", e);
-                        JOptionPane
-                                .showMessageDialog(this, e.getMessage(), langs
-                                        .getString(
-                                                "error.command"), JOptionPane.ERROR_MESSAGE);
-                    }
                         });
 
-//                this.currentPlayer.play();
                     }
-            else
+                }
+            }
+            catch (ExecutionException | InterruptedException e)
             {
-                logger.error("No logger found for song {}", this.currentSong
+                logger.error("Could not get current playback status", e);
-                        .getClass());
+                JOptionPane
-            }
+                        .showMessageDialog(this, e.getMessage(), langs
-        }
+                                .getString(
-        else
+                                        "error.command"), JOptionPane.ERROR_MESSAGE);
-        {
-            this.currentPlayer = null;
-            this.progress.setMaximum(0);
             }
+        });
     }
 
     @Override
     public void onPlaybackChanged(PlaybackEvent status)
-    {
-        if (status.getSource() != null && status
-                .getSource() == this.currentPlayer)
     {
         switch (status.getInfo().getStatus())
         {
@@ -549,4 +503,3 @@ public class PlayerControls extends JPanel implements Queue.SongChangeListener,
                                               .getSong().duration / 1000));
     }
 }
-}

interface/src/main/java/edu/regis/universeplayer/gui/QueueList.java

@@ -2,7 +2,7 @@
  * Copyright (c) 2021 William Hubbard. All Rights Reserved.
  */
 
-package edu.regis.universeplayer.player;
+package edu.regis.universeplayer.gui;
 
 import com.wordpress.tips4java.ScrollablePanel;
 import edu.regis.universeplayer.ClickListener;

interface/src/main/java/edu/regis/universeplayer/gui/SongDisplayListener.java

@@ -2,7 +2,7 @@
  * Copyright (c) 2021 William Hubbard. All Rights Reserved.
  */
 
-package edu.regis.universeplayer.player;
+package edu.regis.universeplayer.gui;
 
 import java.util.Collection;
 import java.util.EventListener;

interface/src/main/java/edu/regis/universeplayer/gui/SongList.java

@@ -2,7 +2,7 @@
  * Copyright (c) 2021 William Hubbard. All Rights Reserved.
  */
 
-package edu.regis.universeplayer.player;
+package edu.regis.universeplayer.gui;
 
 import com.wordpress.tips4java.ScrollablePanel;
 

interface/src/main/java/edu/regis/universeplayer/player/AudioFile.java

@@ -2,7 +2,7 @@
  * Copyright (c) 2021 William Hubbard. All Rights Reserved.
  */
 
-package edu.regis.universeplayer.localPlayer;
+package edu.regis.universeplayer.player;
 
 import java.io.IOException;
 import java.io.InputStream;

interface/src/main/java/edu/regis/universeplayer/player/BrowserPlayer.java

@@ -2,12 +2,12 @@
  * Copyright (c) 2021 William Hubbard. All Rights Reserved.
  */
 
-package edu.regis.universeplayer.browser;
+package edu.regis.universeplayer.player;
 
 import edu.regis.universeplayer.PlaybackInfo;
 import edu.regis.universeplayer.PlaybackListener;
 import edu.regis.universeplayer.PlaybackStatus;
-import edu.regis.universeplayer.Player;
+import edu.regis.universeplayer.browser.Browser;
 import edu.regis.universeplayer.browserCommands.*;
 import edu.regis.universeplayer.data.InternetSong;
 import edu.regis.universeplayer.data.PlaybackEvent;
@@ -59,6 +59,22 @@ public class BrowserPlayer implements Player<InternetSong>, UpdateListener
         return browserRef;
     }
 
+    public BrowserPlayer()
+    {
+        Thread browserThread = new Thread(() -> {
+            try
+            {
+                this.browserRef = Browser.createBrowser();
+                this.browserRef.run();
+            }
+            catch (IOException | InterruptedException e)
+            {
+                logger.error("Could not initialize browser", e);
+            }
+        });
+        browserThread.start();
+    }
+
     @Override
     public Song getCurrentSong()
     {

interface/src/main/java/edu/regis/universeplayer/player/LocalPlayer.java

@@ -1,20 +1,22 @@
 /*
  * Copyright (c) 2021 William Hubbard. All Rights Reserved.
  */
-package edu.regis.universeplayer.localPlayer;
+package edu.regis.universeplayer.player;
 
 import com.intervigil.wave.WaveReader;
+
 import edu.regis.universeplayer.PlaybackInfo;
 import edu.regis.universeplayer.PlaybackListener;
 import edu.regis.universeplayer.PlaybackStatus;
-import edu.regis.universeplayer.Player;
 import edu.regis.universeplayer.browserCommands.CommandConfirmation;
 import edu.regis.universeplayer.browserCommands.QueryFuture;
 import edu.regis.universeplayer.data.LocalSong;
 import edu.regis.universeplayer.data.PlaybackEvent;
 import edu.regis.universeplayer.data.Song;
+
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
+
 import uk.co.caprica.vlcj.factory.MediaPlayerFactory;
 import uk.co.caprica.vlcj.media.MediaRef;
 import uk.co.caprica.vlcj.media.TrackType;
@@ -24,6 +26,7 @@ import uk.co.caprica.vlcj.player.base.StatusApi;
 import uk.co.caprica.vlcj.player.component.AudioPlayerComponent;
 
 import javax.swing.*;
+
 import java.io.File;
 import java.io.FileNotFoundException;
 import java.io.FileOutputStream;
@@ -39,7 +42,8 @@ import java.util.concurrent.*;
  */
 public class LocalPlayer implements Player<LocalSong>, MediaPlayerEventListener
 {
-    private static final Logger logger = LoggerFactory.getLogger(LocalPlayer.class);
+    private static final Logger logger = LoggerFactory
+            .getLogger(LocalPlayer.class);
 
     private final MediaPlayerFactory playerFactory;
     private final AudioPlayerComponent player;
@@ -73,7 +77,8 @@ public class LocalPlayer implements Player<LocalSong>, MediaPlayerEventListener
     }
 
     /**
-     * Saves the current file as a WAVE file somewhere else. This method is meant for testing only.
+     * Saves the current file as a WAVE file somewhere else. This method is
+     * meant for testing only.
      *
      * @param file - The file to save to.
      */
@@ -120,21 +125,35 @@ public class LocalPlayer implements Player<LocalSong>, MediaPlayerEventListener
             this.stopSong();
         }
         this.currentSong = song;
-        this.player.mediaPlayer().media().play(song.file.getAbsolutePath());
+        if (!this.player.mediaPlayer().media()
+                        .play(song.file.getAbsolutePath()))
+        {
+            return new NullFuture<>(new RuntimeException("Could not play " +
+                    "song " + song));
+        }
+        else
+        {
             return new NullFuture<>();
         }
+    }
 
     @Override
     public QueryFuture<Void> play()
     {
-        this.player.mediaPlayer().submit((WrappedRunnable) () -> this.player.mediaPlayer().controls().play());
+        this.player.mediaPlayer()
+                   .submit((WrappedRunnable) () -> this.player.mediaPlayer()
+                                                              .controls()
+                                                              .play());
         return new NullFuture<>();
     }
 
     @Override
     public QueryFuture<Void> pause()
     {
-        this.player.mediaPlayer().submit((WrappedRunnable) () -> this.player.mediaPlayer().controls().pause());
+        this.player.mediaPlayer()
+                   .submit((WrappedRunnable) () -> this.player.mediaPlayer()
+                                                              .controls()
+                                                              .pause());
         return new NullFuture<>();
     }
 
@@ -154,14 +173,19 @@ public class LocalPlayer implements Player<LocalSong>, MediaPlayerEventListener
     @Override
     public QueryFuture<Void> stopSong()
     {
-        this.player.mediaPlayer().submit((WrappedRunnable) () -> this.player.mediaPlayer().controls().stop());
+        this.player.mediaPlayer()
+                   .submit((WrappedRunnable) () -> this.player.mediaPlayer()
+                                                              .controls()
+                                                              .stop());
         return new NullFuture<>();
     }
 
     @Override
     public QueryFuture<Void> seek(float time)
     {
-        this.player.mediaPlayer().submit((WrappedRunnable) () -> this.player.mediaPlayer().controls()
+        this.player.mediaPlayer()
+                   .submit((WrappedRunnable) () -> this.player.mediaPlayer()
+                                                              .controls()
                                                               .setTime((long) (time * 1000)));
         return new NullFuture<>();
     }
@@ -184,13 +208,15 @@ public class LocalPlayer implements Player<LocalSong>, MediaPlayerEventListener
     @Override
     public QueryFuture<Float> getCurrentTime()
     {
-        return new NullFuture<>(this.player.mediaPlayer().status().time() / 1000F);
+        return new NullFuture<>(this.player.mediaPlayer().status()
+                                           .time() / 1000F);
     }
 
     @Override
     public QueryFuture<Float> getLength()
     {
-        return new NullFuture<>(this.player.mediaPlayer().status().length() / 1000F);
+        return new NullFuture<>(this.player.mediaPlayer().status()
+                                           .length() / 1000F);
     }
 
     @Override
@@ -227,7 +253,8 @@ public class LocalPlayer implements Player<LocalSong>, MediaPlayerEventListener
      * @param file - The file to read
      * @return An raw stream for the file
      * @throws FileNotFoundException - Thrown should the file not exist.
-     * @throws IOException           - Thrown should an error occur when reading the file
+     * @throws IOException           - Thrown should an error occur when reading
+     *                               the file
      */
     public static AudioFile getAudioStream(File file) throws IOException
     {
@@ -235,12 +262,14 @@ public class LocalPlayer implements Player<LocalSong>, MediaPlayerEventListener
     }
 
     /**
-     * Converts any audio file to a stream containing WAV audio file data (courtesy of FFMPEG).
+     * Converts any audio file to a stream containing WAV audio file data
+     * (courtesy of FFMPEG).
      *
      * @param file - The file to convert
      * @return An input stream containing the file data
      * @throws FileNotFoundException - Thrown should the file not exist.
-     * @throws IOException           - Thrown should an error occur when reading the file
+     * @throws IOException           - Thrown should an error occur when reading
+     *                               the file
      */
     protected static Process convertFile(File file) throws FileNotFoundException, IOException
     {
@@ -304,7 +333,8 @@ public class LocalPlayer implements Player<LocalSong>, MediaPlayerEventListener
     /**
      * The media started playing.
      * <p>
-     * There is no guarantee that a video output has been created at this point.
+     * There is no guarantee that a video output has been created at this
+     * point.
      *
      * @param mediaPlayer media player that raised the event
      */
@@ -312,7 +342,10 @@ public class LocalPlayer implements Player<LocalSong>, MediaPlayerEventListener
     public void playing(MediaPlayer mediaPlayer)
     {
         logger.debug("Local player playing.");
-        SwingUtilities.invokeLater(() -> this.listeners.forEach(playbackListener -> playbackListener.onPlaybackChanged(new PlaybackEvent(this, new PlaybackInfo(this.currentSong, mediaPlayer.status().time(), PlaybackStatus.PLAYING)))));
+        SwingUtilities.invokeLater(() -> this.listeners
+                .forEach(playbackListener -> playbackListener
+                        .onPlaybackChanged(new PlaybackEvent(this, new PlaybackInfo(this.currentSong, mediaPlayer
+                                .status().time(), PlaybackStatus.PLAYING)))));
     }
 
     /**
@@ -324,15 +357,19 @@ public class LocalPlayer implements Player<LocalSong>, MediaPlayerEventListener
     public void paused(MediaPlayer mediaPlayer)
     {
         logger.debug("Local player paused.");
-        SwingUtilities.invokeLater(() -> this.listeners.forEach(playbackListener -> playbackListener.onPlaybackChanged(new PlaybackEvent(this, new PlaybackInfo(this.currentSong, mediaPlayer.status().time(), PlaybackStatus.PAUSED)))));
+        SwingUtilities.invokeLater(() -> this.listeners
+                .forEach(playbackListener -> playbackListener
+                        .onPlaybackChanged(new PlaybackEvent(this, new PlaybackInfo(this.currentSong, mediaPlayer
+                                .status().time(), PlaybackStatus.PAUSED)))));
     }
 
     /**
      * Media stopped.
      * <p>
-     * A stopped event may be raised under certain circumstances even if the media player is not playing (e.g. as part
+     * A stopped event may be raised under certain circumstances even if the
-     * of the associated media list player sub-item handling). Client applications must therefore be prepared to handle
+     * media player is not playing (e.g. as part of the associated media list
-     * such a situation.
+     * player sub-item handling). Client applications must therefore be prepared
+     * to handle such a situation.
      *
      * @param mediaPlayer media player that raised the event
      */
@@ -340,7 +377,10 @@ public class LocalPlayer implements Player<LocalSong>, MediaPlayerEventListener
     public void stopped(MediaPlayer mediaPlayer)
     {
         logger.debug("Local player stopped prematurely.");
-        SwingUtilities.invokeLater(() -> this.listeners.forEach(playbackListener -> playbackListener.onPlaybackChanged(new PlaybackEvent(this, new PlaybackInfo(this.currentSong, mediaPlayer.status().time(), PlaybackStatus.STOPPED)))));
+        SwingUtilities.invokeLater(() -> this.listeners
+                .forEach(playbackListener -> playbackListener
+                        .onPlaybackChanged(new PlaybackEvent(this, new PlaybackInfo(this.currentSong, mediaPlayer
+                                .status().time(), PlaybackStatus.STOPPED)))));
     }
 
     /**
@@ -374,7 +414,10 @@ public class LocalPlayer implements Player<LocalSong>, MediaPlayerEventListener
     public void finished(MediaPlayer mediaPlayer)
     {
         logger.debug("Local player finished.");
-        SwingUtilities.invokeLater(() -> this.listeners.forEach(playbackListener -> playbackListener.onPlaybackChanged(new PlaybackEvent(this, new PlaybackInfo(this.currentSong, mediaPlayer.status().time(), PlaybackStatus.FINISHED)))));
+        SwingUtilities.invokeLater(() -> this.listeners
+                .forEach(playbackListener -> playbackListener
+                        .onPlaybackChanged(new PlaybackEvent(this, new PlaybackInfo(this.currentSong, mediaPlayer
+                                .status().time(), PlaybackStatus.FINISHED)))));
     }
 
     /**
@@ -386,7 +429,9 @@ public class LocalPlayer implements Player<LocalSong>, MediaPlayerEventListener
     @Override
     public void timeChanged(MediaPlayer mediaPlayer, long newTime)
     {
-        SwingUtilities.invokeLater(() -> this.listeners.forEach(playbackListener -> playbackListener.onPlaybackChanged(new PlaybackEvent(this, new PlaybackInfo(this.currentSong, newTime / 1000F, PlaybackStatus.PLAYING)))));
+        SwingUtilities.invokeLater(() -> this.listeners
+                .forEach(playbackListener -> playbackListener
+                        .onPlaybackChanged(new PlaybackEvent(this, new PlaybackInfo(this.currentSong, newTime / 1000F, PlaybackStatus.PLAYING)))));
     }
 
     /**
@@ -531,7 +576,8 @@ public class LocalPlayer implements Player<LocalSong>, MediaPlayerEventListener
      * other application) starts/stops playing media.
      *
      * @param mediaPlayer media player that raised the event
-     * @param corked      <code>true</code> if corked; otherwise <code>false</code>
+     * @param corked      <code>true</code> if corked; otherwise
+     *                    <code>false</code>
      */
     @Override
     public void corked(MediaPlayer mediaPlayer, boolean corked)
@@ -543,7 +589,8 @@ public class LocalPlayer implements Player<LocalSong>, MediaPlayerEventListener
      * The audio was muted/un-muted.
      *
      * @param mediaPlayer media player that raised the event
-     * @param muted       <code>true</code> if muted; otherwise <code>false</code>
+     * @param muted       <code>true</code> if muted; otherwise
+     *                    <code>false</code>
      */
     @Override
     public void muted(MediaPlayer mediaPlayer, boolean muted)
@@ -609,9 +656,10 @@ public class LocalPlayer implements Player<LocalSong>, MediaPlayerEventListener
      * The event will be fired again if the media is played again after a native
      * stopped or finished event is received.
      * <p>
-     * Waiting for this event may be more reliable than using {@link #playing(MediaPlayer)}
+     * Waiting for this event may be more reliable than using {@link
-     * or {@link #videoOutput(MediaPlayer, int)} in some cases (logo and marquee
+     * #playing(MediaPlayer)} or {@link #videoOutput(MediaPlayer, int)} in some
-     * already mentioned, also setting audio tracks, sub-title tracks and so on).
+     * cases (logo and marquee already mentioned, also setting audio tracks,
+     * sub-title tracks and so on).
      *
      * @param mediaPlayer media player that raised the event
      */
@@ -692,27 +740,40 @@ public class LocalPlayer implements Player<LocalSong>, MediaPlayerEventListener
     private static class NullFuture<T> implements QueryFuture<T>
     {
         private final T value;
+        private final CommandConfirmation confirmation;
 
         NullFuture()
         {
-            this(null);
+            this((T) null);
         }
 
         NullFuture(T returnVal)
         {
             this.value = returnVal;
+            this.confirmation = new CommandConfirmation();
+        }
+
+        NullFuture(Throwable error)
+        {
+            this(error, null);
+        }
+
+        NullFuture(Throwable error, T returnVal)
+        {
+            this.value = returnVal;
+            this.confirmation = new CommandConfirmation(error);
         }
 
         @Override
         public CommandConfirmation getConfirmation() throws CancellationException
         {
-            return new CommandConfirmation();
+            return this.confirmation;
         }
 
         @Override
         public CommandConfirmation getConfirmation(long timeout, TimeUnit unit)
         {
-            return new CommandConfirmation();
+            return this.getConfirmation();
         }
 
         @Override
@@ -742,7 +803,7 @@ public class LocalPlayer implements Player<LocalSong>, MediaPlayerEventListener
         @Override
         public T get(long timeout, TimeUnit unit) throws InterruptedException, ExecutionException, TimeoutException
         {
-            return this.value;
+            return get();
         }
     }
 

interface/src/main/java/edu/regis/universeplayer/player/Player.java

@@ -2,8 +2,10 @@
  * Copyright (c) 2021 William Hubbard. All Rights Reserved.
  */
 
-package edu.regis.universeplayer;
+package edu.regis.universeplayer.player;
 
+import edu.regis.universeplayer.PlaybackListener;
+import edu.regis.universeplayer.PlaybackStatus;
 import edu.regis.universeplayer.browserCommands.QueryFuture;
 import edu.regis.universeplayer.data.Song;
 
@@ -19,31 +21,6 @@ import java.util.HashMap;
  */
 public interface Player<T extends Song>
 {
-    HashMap<Class<? extends Song>, Player<?>> REGISTERED_PLAYERS = new HashMap<>();
-    
-    /**
-     * Obtains a song player that can play the provided song.
-     *
-     * @param song - The song to play.
-     * @return A compatible player, or null if none is found.
-     */
-    static Player<?> getCompatiblePlayer(Song song)
-    {
-        Player<?> player = REGISTERED_PLAYERS.get(song.getClass());
-        if (player == null)
-        {
-            for (Class<? extends Song> songClass : REGISTERED_PLAYERS.keySet())
-            {
-                if (songClass.isAssignableFrom(song.getClass()))
-                {
-                    player = REGISTERED_PLAYERS.get(songClass);
-                    break;
-                }
-            }
-        }
-        return player;
-    }
-    
     /**
      * Obtains the song currently playing.
      *

interface/src/main/java/edu/regis/universeplayer/player/PlayerManager.java

@@ -0,0 +1,380 @@
+package edu.regis.universeplayer.player;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.HashMap;
+import java.util.LinkedList;
+import java.util.concurrent.CancellationException;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.TimeoutException;
+
+import javax.swing.JOptionPane;
+
+import edu.regis.universeplayer.PlaybackListener;
+import edu.regis.universeplayer.PlaybackStatus;
+import edu.regis.universeplayer.browserCommands.CommandConfirmation;
+import edu.regis.universeplayer.browserCommands.QueryFuture;
+import edu.regis.universeplayer.data.InternetSong;
+import edu.regis.universeplayer.data.LocalSong;
+import edu.regis.universeplayer.data.PlaybackEvent;
+import edu.regis.universeplayer.data.Queue;
+import edu.regis.universeplayer.data.Song;
+import edu.regis.universeplayer.gui.Interface;
+
+/**
+ * The PlayerManager serves as the central access point for playing songs of any
+ * type.
+ *
+ * @author William Hubbard
+ * @version 0.1
+ */
+public class PlayerManager implements PlaybackListener
+{
+    private static final Logger logger =
+            LoggerFactory.getLogger(PlayerManager.class);
+    private static PlayerManager INSTANCE;
+    private LinkedList<PlaybackListener> listeners = new LinkedList<>();
+
+    public static PlayerManager getPlayers()
+    {
+        if (INSTANCE == null)
+        {
+            INSTANCE = new PlayerManager();
+        }
+        return INSTANCE;
+    }
+
+    /**
+     * Links to other players.
+     */
+    private final HashMap<Class<? extends Song>, Player> players =
+            new HashMap<>();
+
+    /**
+     * A reference to the player currently playing a song.
+     */
+    private Player currentPlayer;
+
+    /**
+     * A reference to the song currently being played.
+     */
+    private Song currentSong;
+
+    public PlayerManager()
+    {
+        this.initPlayers();
+    }
+
+    /**
+     * Obtains a song player that can play the provided song.
+     *
+     * @param song - The song to play.
+     * @return A compatible player, or null if none is found.
+     */
+    public Player<?> getCompatiblePlayer(Song song)
+    {
+        Player<?> player = this.players.get(song.getClass());
+        if (player == null)
+        {
+            for (Class<? extends Song> songClass : this.players.keySet())
+            {
+                if (songClass.isAssignableFrom(song.getClass()))
+                {
+                    player = this.players.get(songClass);
+                    break;
+                }
+            }
+        }
+        return player;
+    }
+
+    /**
+     * Initializes the default players.
+     */
+    private void initPlayers()
+    {
+        this.initPlayer(LocalSong.class, new LocalPlayer());
+        this.initPlayer(InternetSong.class, new BrowserPlayer());
+    }
+
+    private <T extends Song> void initPlayer(Class<T> songType,
+                                             Player<T> player)
+    {
+        boolean playerRegistered = this.players.containsValue(player);
+        this.players.put(songType, player);
+        if (!playerRegistered)
+        {
+            player.addPlaybackListener(this);
+        }
+    }
+
+    /**
+     * Performs the necessary shutdown procedures for all players.
+     */
+    public void shutdownPlayers()
+    {
+        this.players.values().forEach(Player::close);
+    }
+
+    /**
+     * Obtains the active song player.
+     *
+     * @return - The player currently playing a song.
+     */
+    protected Player getCurrentPlayer()
+    {
+        return this.currentPlayer;
+    }
+
+    /**
+     * Obtains the active song.
+     *
+     * @return - The song currently playing.
+     */
+    public Song getCurrentSong()
+    {
+        return this.currentSong;
+    }
+
+    /**
+     * Creates a QueryFuture response for if no player is found.
+     *
+     * @param message - The message to send.
+     * @return A new future to return.
+     */
+    private <T> QueryFuture<T> getNullPlayer(String message, T returnValue)
+    {
+        return new QueryFuture<T>()
+        {
+            @Override
+            public CommandConfirmation getConfirmation() throws CancellationException, ExecutionException, InterruptedException
+            {
+                if (returnValue instanceof Throwable)
+                {
+                    return new CommandConfirmation((Throwable) returnValue);
+                }
+                else
+                {
+                    return new CommandConfirmation(message);
+                }
+            }
+
+            @Override
+            public CommandConfirmation getConfirmation(long timeout, TimeUnit unit) throws InterruptedException, ExecutionException, TimeoutException
+            {
+                return this.getConfirmation();
+            }
+
+            @Override
+            public boolean cancel(boolean mayInterruptIfRunning)
+            {
+                return false;
+            }
+
+            @Override
+            public boolean isCancelled()
+            {
+                return false;
+            }
+
+            @Override
+            public boolean isDone()
+            {
+                return true;
+            }
+
+            @Override
+            public T get() throws InterruptedException, ExecutionException
+            {
+                return returnValue;
+            }
+
+            @Override
+            public T get(long timeout, TimeUnit unit) throws InterruptedException, ExecutionException, TimeoutException
+            {
+                return this.get();
+            }
+        };
+    }
+
+    /**
+     * Creates a QueryFuture response for if no player is found.
+     *
+     * @param message - The error to send.
+     * @return A new future to return.
+     */
+    private <T> QueryFuture<T> getNullPlayer(Throwable message, T returnValue)
+    {
+        return new QueryFuture<T>()
+        {
+            @Override
+            public CommandConfirmation getConfirmation() throws CancellationException, ExecutionException, InterruptedException
+            {
+                return new CommandConfirmation(message);
+            }
+
+            @Override
+            public CommandConfirmation getConfirmation(long timeout, TimeUnit unit) throws InterruptedException, ExecutionException, TimeoutException
+            {
+                return this.getConfirmation();
+            }
+
+            @Override
+            public boolean cancel(boolean mayInterruptIfRunning)
+            {
+                return false;
+            }
+
+            @Override
+            public boolean isCancelled()
+            {
+                return false;
+            }
+
+            @Override
+            public boolean isDone()
+            {
+                return true;
+            }
+
+            @Override
+            public T get() throws InterruptedException, ExecutionException
+            {
+                return returnValue;
+            }
+
+            @Override
+            public T get(long timeout, TimeUnit unit) throws InterruptedException, ExecutionException, TimeoutException
+            {
+                return this.get();
+            }
+        };
+    }
+
+    public QueryFuture<Void> playSong(Song song)
+    {
+        if (this.currentSong != null)
+        {
+            this.currentPlayer.stopSong();
+        }
+        this.currentSong = null;
+        this.currentPlayer = this.getCompatiblePlayer(song);
+        if (this.currentPlayer == null)
+        {
+            throw new IllegalArgumentException("Unknown song type " + song
+                    .getClass());
+        }
+        this.currentSong = song;
+        return this.currentPlayer.loadSong(song);
+    }
+
+    public QueryFuture<PlaybackStatus> getStatus()
+    {
+        if (this.currentPlayer != null)
+        {
+            return this.currentPlayer.getStatus();
+        }
+        return this.getNullPlayer("Command successful", PlaybackStatus.EMPTY);
+    }
+
+    public QueryFuture<Void> seek(float time)
+    {
+        if (this.currentPlayer != null)
+        {
+            return this.currentPlayer.seek(time);
+        }
+        return null;
+    }
+
+    public QueryFuture<Void> play()
+    {
+        if (this.currentPlayer != null && this.currentSong != null)
+        {
+            return this.currentPlayer.play();
+        }
+        return null;
+    }
+
+    public QueryFuture<Void> pause()
+    {
+        if (this.currentPlayer != null && this.currentSong != null)
+        {
+            return this.currentPlayer.pause();
+        }
+        return null;
+    }
+
+    public QueryFuture<Void> toggle()
+    {
+        if (this.currentPlayer != null && this.currentSong != null)
+        {
+            return this.currentPlayer.togglePlayback();
+        }
+        return null;
+    }
+
+    public QueryFuture<Void> stopSong()
+    {
+        if (this.currentPlayer != null && this.currentSong != null)
+        {
+            this.currentSong = null;
+            return this.currentPlayer.stopSong();
+        }
+        return null;
+    }
+
+    public void addPlaybackListener(PlaybackListener listener)
+    {
+        if (!this.hasPlaybackListener(listener))
+        {
+            this.listeners.add(listener);
+        }
+    }
+
+    public boolean hasPlaybackListener(PlaybackListener listener)
+    {
+        return this.listeners.contains(listener);
+    }
+
+    public void removePlaybackListener(PlaybackListener listener)
+    {
+        this.listeners.remove(listener);
+    }
+
+    /**
+     * Called when playback is changed.
+     *
+     * @param status - The playback status.
+     */
+    @Override
+    public void onPlaybackChanged(PlaybackEvent status)
+    {
+        if (status.getSource() == this.currentPlayer)
+        {
+            for (PlaybackListener l : this.listeners)
+            {
+                l.onPlaybackChanged(status);
+            }
+        }
+    }
+
+    /**
+     * Sends an error to the browser player.
+     * @param forward - Whether the error should be thrown in a foreground
+     *                script or a background script.
+     * @return The command future.
+     */
+    public QueryFuture<Void> throwError(boolean forward)
+    {
+        BrowserPlayer player =
+                (BrowserPlayer) this.players.get(InternetSong.class);
+        if (player == null)
+        {
+            return this.getNullPlayer(new NullPointerException(
+                    "No browser found"), null);
+        }
+        return player.throwError(forward);
+    }
+}

interface/src/test/java/DBTest.java

@@ -2,7 +2,8 @@
  * Copyright (c) 2021 William Hubbard. All Rights Reserved.
  */
 
-import edu.regis.universeplayer.player.Interface;
+import edu.regis.universeplayer.ConfigManager;
+
 import org.junit.Test;
 
 import java.io.File;
@@ -13,53 +14,4 @@ import static junit.framework.Assert.assertTrue;
 
 public class DBTest
 {
-    @Test
-    public void test() throws ClassNotFoundException, SQLException
-    {
-        try
-        {
-            Class.forName("org.sqlite.JDBC");
-            Connection db;
-            Statement stat;
-            ResultSet tableResult;
-//            db = DriverManager.getConnection("jdbc:sqlite:" + new File(Interface.getDataDir().getAbsolutePath(), "universalmusictest.db").getAbsolutePath());
-//            db.setAutoCommit(false);
-//            stat = db.createStatement();
-//            tableResult = stat.executeQuery("SELECT name FROM sqlite_master WHERE type='table' AND name='INFO';");
-//            if (!tableResult.next())
-//            {
-//                System.out.println("Creating song table");
-//                /*
-//                 * Create the table
-//                 */
-//                stat.executeUpdate("CREATE TABLE INFO" +
-//                        "(DATA INTEGER PRIMARY KEY NOT NULL);");
-//            }
-//            else
-//            {
-//                System.out.println("Clearing table");
-//                stat.executeUpdate("DELETE FROM INFO;");
-//            }
-//            tableResult.close();
-//            stat.executeUpdate("INSERT INTO INFO (DATA) VALUES (1);");
-//            stat.close();
-//            db.commit();
-//            db.close();
-    
-            db = DriverManager.getConnection("jdbc:sqlite:" + new File(Interface.getDataDir().getAbsolutePath(), "universalmusictest.db").getAbsolutePath());
-            db.setAutoCommit(false);
-            stat = db.createStatement();
-            tableResult = stat.executeQuery("SELECT (DATA) FROM INFO");
-            assertTrue(tableResult.next());
-            assertEquals(1, tableResult.getInt("DATA"));
-            tableResult.close();
-            stat.close();
-            db.close();
-        }
-        catch (SQLException e)
-        {
-            e.printStackTrace();
-            throw e;
-        }
-    }
 }