Make MusicHandler track ending behaviour more constistent.

src/main/java/moe/nekojimi/chords/MusicHandler.java

@@ -38,7 +38,7 @@ public class MusicHandler implements AudioSendHandler, Closeable, Consumer<Track
         this.nowPlayingConsumer = nowPlayingConsumer;
     }
 
-    private Track currentTrack;
+//    private Track currentTrack;
 //    private TrackPlayer player;
     private final List<TrackPlayer> playingTracks = new ArrayList<>();
 
@@ -61,6 +61,16 @@ public class MusicHandler implements AudioSendHandler, Closeable, Consumer<Track
 
     public void playOver(Track track)
     {
+        if (!isPlaying())
+            play(track);
+        try
+        {
+            TrackPlayer player = new TrackPlayer(track);
+            playingTracks.add(player);
+        } catch (UnsupportedAudioFileException | IOException ex)
+        {
+            Logger.getLogger(Chords.class.getName()).log(Level.SEVERE, null, ex);
+        }
 
     }
 
@@ -71,7 +81,9 @@ public class MusicHandler implements AudioSendHandler, Closeable, Consumer<Track
 
     public boolean play(Track track, boolean immediate)
     {
-        if (track == currentTrack)
+        if (playingTracks.stream().anyMatch((t) -> t.getTrack() == track))
+            return false;
+        if (track == null)
             return false;
 
         if (immediate)
@@ -82,30 +94,19 @@ public class MusicHandler implements AudioSendHandler, Closeable, Consumer<Track
 
         try
         {
-            if (currentTrack != null)
-            {
-                if (!currentTrack.isKept())
-                    currentTrack.delete();
-                currentTrack = null;
-            }
-            currentTrack = track;
             if (nowPlayingConsumer != null)
-                nowPlayingConsumer.accept(currentTrack);
+                nowPlayingConsumer.accept(track);
-            if (currentTrack == null)
+
-            {
-                return false;
-            }
 //            System.out.println("Playing track " + currentTrack.getLocation().getAbsolutePath());
             arrayErr = false;
             byteCount = 3840;
-            TrackPlayer player = new TrackPlayer(currentTrack);
+            TrackPlayer player = new TrackPlayer(track);
             playingTracks.add(player);
 //            System.out.println("Queue filled to " + audioBuffer.getCurrentNumberOfBytes());
             return true;
         } catch (UnsupportedAudioFileException | IOException ex)
         {
             Logger.getLogger(Chords.class.getName()).log(Level.SEVERE, null, ex);
-            currentTrack = null;
             requestTrack();
         } finally
         {
@@ -179,6 +180,12 @@ public class MusicHandler implements AudioSendHandler, Closeable, Consumer<Track
                     //                outOfInput = true;
                 }
             }
+            for (TrackPlayer emptyPlayer : emptyPlayers)
+            {
+                if (!emptyPlayer.getTrack().isKept())
+                    emptyPlayer.getTrack().delete();
+                emptyPlayer.getTrack().clearInputStream();
+            }
             playingTracks.removeAll(emptyPlayers);
             ret.put(mixBuffers(mixes));
             if (outOfInput)
@@ -198,7 +205,9 @@ public class MusicHandler implements AudioSendHandler, Closeable, Consumer<Track
 
     public Track getCurrentTrack()
     {
-        return currentTrack;
+        if (playingTracks.isEmpty())
+            return null;
+        return playingTracks.get(0).getTrack();
     }
 
     @Override
@@ -251,7 +260,6 @@ public class MusicHandler implements AudioSendHandler, Closeable, Consumer<Track
         if (!isPlaying())
             return false;
         playingTracks.clear();
-        currentTrack = null;
         requestTrack();
         return true;
     }