Downloader: keep track of download queue.

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

@@ -8,6 +8,9 @@ package moe.nekojimi.chords;
 import java.io.File;
 import java.io.InputStream;
 import java.nio.charset.Charset;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Queue;
 import java.util.concurrent.LinkedBlockingDeque;
 import java.util.concurrent.ThreadPoolExecutor;
 import java.util.concurrent.TimeUnit;
@@ -24,9 +27,9 @@ import java.util.regex.Pattern;
  */
 public class Downloader implements Consumer<Song>
 {
-//    private final Queue<Song> downloadQueue = new LinkedBlockingDeque<>();
+    private final List<Song> downloadQueue = new LinkedList<>();
     private final LinkedBlockingDeque<Runnable> workQueue = new LinkedBlockingDeque<>();
-    private final ThreadPoolExecutor exec = new ThreadPoolExecutor(1, 4, 30, TimeUnit.SECONDS, workQueue);
+    private final ThreadPoolExecutor exec = new ThreadPoolExecutor(2, 4, 30, TimeUnit.SECONDS, workQueue);
     private Consumer<Song> next;
     private BiConsumer<Song, Exception> messageHandler;
 
@@ -38,9 +41,14 @@ public class Downloader implements Consumer<Song>
     @Override
     public void accept(Song song)
     {
-        exec.submit(() ->
+        downloadQueue.add(song);
+        exec.submit(new Runnable()
+        {
+            @Override
+            public void run()
             {
                 download(song);
+            }
         });
     }
 
@@ -76,12 +84,14 @@ public class Downloader implements Consumer<Song>
 
             if (next != null)
                 next.accept(song);
+            downloadQueue.remove(song);
             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);
         }
     }
 
@@ -95,4 +105,9 @@ public class Downloader implements Consumer<Song>
         this.messageHandler = messageHandler;
     }
 
+    public List<Song> getDownloadQueue()
+    {
+        return downloadQueue;
+    }
+
 }