Change downloader to allow different destinations for downloaded songs.

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

@@ -26,22 +26,23 @@ import java.util.stream.Collectors;
 import javax.json.Json;
 import javax.json.JsonObject;
 import javax.json.JsonReader;
+import moe.nekojimi.chords.Downloader.DownloadTask;
 
 /**
  *
  * @author jimj316
  */
-public class Downloader implements Consumer<Song>
+public class Downloader implements Consumer<DownloadTask>
 {
 
     private static final int BITRATE_TARGET = 64_000;
     private static final Pattern FORMAT_PATTERN = Pattern.compile("^([\\w]+)\\s+([\\w]+)\\s+(\\w+ ?\\w*)\\s+(.*)$");
     public static final Pattern DESTINATION_PATTERN = Pattern.compile("Destination: (.*\\.wav)");
 
-    private final List<Song> downloadQueue = new LinkedList<>();
+    private final List<DownloadTask> downloadQueue = new LinkedList<>();
     private final LinkedBlockingDeque<Runnable> workQueue = new LinkedBlockingDeque<>();
     private final ThreadPoolExecutor exec = new ThreadPoolExecutor(2, 4, 30, TimeUnit.SECONDS, workQueue);
-    private Consumer<Song> next;
+//    private Consumer<Song> next;
     private BiConsumer<Song, Exception> messageHandler;
 
     private File downloadDir = null;
@@ -52,32 +53,30 @@ public class Downloader implements Consumer<Song>
     }
 
     @Override
-    public void accept(Song song)
+    public void accept(DownloadTask task)
     {
-        downloadQueue.add(song);
-        getInfo(song);
-        exec.submit(new Runnable()
+        // if already downloaded, just skip
+        if (task.getSong().isDownloaded())
         {
-            @Override
-            public void run()
+            task.getDestination().accept(task.getSong());
+            return;
+        }
+
+        downloadQueue.add(task);
+        getInfo(task.getSong());
+        exec.submit(() ->
+        {
+            try
             {
-                try
-                {
-                    getFormats(song);
-                    download(song);
-                } catch (Exception ex)
-                {
-                    ex.printStackTrace();
-                }
+                getFormats(task.getSong());
+                download(task);
+            } catch (Exception ex)
+            {
+                ex.printStackTrace();
             }
         });
     }
 
-    public void setNext(Consumer<Song> next)
-    {
-        this.next = next;
-    }
-
     private void chooseFormats(Song song)
     {
         List<Format> formats = song.getFormats();
@@ -195,8 +194,9 @@ public class Downloader implements Consumer<Song>
         return downloadDir;
     }
 
-    private void download(Song song)
+    private void download(DownloadTask task)
     {
+        Song song = task.song;
         chooseFormats(song);
         String formatCodes = "";
         final List<Format> formats = song.getFormats();
@@ -225,16 +225,16 @@ public class Downloader implements Consumer<Song>
                 throw new RuntimeException("youtube-dl failed with error " + exec.exitValue() + ", output:\n" + error);
 //            return true;
 
-            if (next != null)
-                next.accept(song);
-            downloadQueue.remove(song);
+            if (task.getDestination() != null)
+                task.getDestination().accept(song);
+            downloadQueue.remove(task);
             messageHandler.accept(song, null);
         } catch (Exception ex)
         {
             Logger.getLogger(Downloader.class.getName()).log(Level.SEVERE, null, ex);
             if (messageHandler != null)
                 messageHandler.accept(song, ex);
-            downloadQueue.remove(song);
+            downloadQueue.remove(task);
         }
     }
 
@@ -262,9 +262,33 @@ public class Downloader implements Consumer<Song>
         this.messageHandler = messageHandler;
     }
 
-    public List<Song> getDownloadQueue()
+    public List<DownloadTask> getDownloadQueue()
     {
         return downloadQueue;
     }
 
+    public static class DownloadTask
+    {
+
+        private final Song song;
+        private final Consumer<Song> destination;
+
+        public DownloadTask(Song song, Consumer<Song> destination)
+        {
+            this.song = song;
+            this.destination = destination;
+        }
+
+        public Song getSong()
+        {
+            return song;
+        }
+
+        public Consumer<Song> getDestination()
+        {
+            return destination;
+        }
+
+    }
+
 }

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

@@ -172,7 +172,7 @@ public class Main extends ListenerAdapter
         song.setRequestedIn(event.getChannel().getId());
         song.setNumber(trackNumber);
         trackNumber++;
-        downloader.accept(song);
+        downloader.accept(new Downloader.DownloadTask(song, musicHandler));
         return song;
     }
 
@@ -197,7 +197,6 @@ public class Main extends ListenerAdapter
         // Get an audio manager for this guild, this will be created upon first use for each guild
         AudioManager audioManager = guild.getAudioManager();
         musicHandler = new MusicHandler();
-        downloader.setNext(musicHandler);
         // Create our Send/Receive handler for the audio connection
 //        EchoHandler handler = new EchoHandler();
 

src/main/java/moe/nekojimi/chords/commands/QueueCommand.java

@@ -18,6 +18,7 @@ package moe.nekojimi.chords.commands;
 
 import java.util.List;
 import java.util.Queue;
+import moe.nekojimi.chords.Downloader;
 import moe.nekojimi.chords.Main;
 import moe.nekojimi.chords.Song;
 import net.dv8tion.jda.api.events.message.guild.GuildMessageReceivedEvent;
@@ -53,13 +54,13 @@ public class QueueCommand extends Command
             }
         }
 
-        final List<Song> downloadQueue = bot.getDownloader().getDownloadQueue();
+        final List<Downloader.DownloadTask> downloadQueue = bot.getDownloader().getDownloadQueue();
         if (!downloadQueue.isEmpty())
         {
             message += "__Downloading:__\n";
-            for (Song song : downloadQueue)
+            for (Downloader.DownloadTask task : downloadQueue)
             {
-                message += ":inbox_tray: **" + (i) + ":** " + song + "\n";
+                message += ":inbox_tray: **" + (i) + ":** " + task.getSong() + "\n";
                 i++;
             }
         }