refactor ListenableFutureTask and make saves async

// FREEBIE

library/src/org/whispersystems/textsecure/util/ListenableFutureTask.java

@@ -1,32 +1,30 @@
 package org.whispersystems.textsecure.util;
 
+import java.util.LinkedList;
+import java.util.List;
 import java.util.concurrent.Callable;
 import java.util.concurrent.ExecutionException;
 import java.util.concurrent.FutureTask;
 
 public class ListenableFutureTask<V> extends FutureTask<V> {
 
-//  private WeakReference<FutureTaskListener<V>> listener;
-  private FutureTaskListener<V> listener;
+  private final List<FutureTaskListener<V>> listeners;
 
-  public ListenableFutureTask(Callable<V> callable, FutureTaskListener<V> listener) {
+  public ListenableFutureTask(Callable<V> callable) {
     super(callable);
-    this.listener = listener;
-//    if (listener == null) {
-//      this.listener = null;
-//    } else {
-//      this.listener = new WeakReference<FutureTaskListener<V>>(listener);
-//    }
+    this.listeners = new LinkedList<>();
   }
 
-  public synchronized void setListener(FutureTaskListener<V> listener) {
-//    if (listener != null) this.listener = new WeakReference<FutureTaskListener<V>>(listener);
-//    else                  this.listener = null;
-    this.listener = listener;
-
+  public synchronized void addListener(FutureTaskListener<V> listener) {
     if (this.isDone()) {
-      callback();
+      callback(listener);
+      return;
     }
+    listeners.add(listener);
+  }
+
+  public synchronized boolean removeListener(FutureTaskListener<V> listener) {
+    return listeners.remove(listener);
   }
 
   @Override
@@ -35,17 +33,19 @@ public class ListenableFutureTask<V> extends FutureTask<V> {
   }
 
   private void callback() {
-    if (this.listener != null) {
-      FutureTaskListener<V> nestedListener = this.listener;
-//      FutureTaskListener<V> nestedListener = this.listener.get();
-      if (nestedListener != null) {
-        try {
-          nestedListener.onSuccess(get());
-        } catch (ExecutionException ee) {
-          nestedListener.onFailure(ee);
-        } catch (InterruptedException e) {
-          throw new AssertionError(e);
-        }
+    for (FutureTaskListener<V> listener : listeners) {
+      callback(listener);
+    }
+  }
+
+  private void callback(FutureTaskListener<V> listener) {
+    if (listener != null) {
+      try {
+        listener.onSuccess(get());
+      } catch (ExecutionException ee) {
+        listener.onFailure(ee);
+      } catch (InterruptedException e) {
+        throw new AssertionError(e);
       }
     }
   }

src/org/thoughtcrime/securesms/ConversationFragment.java

@@ -39,6 +39,7 @@ import org.thoughtcrime.securesms.util.DirectoryHelper;
 import org.thoughtcrime.securesms.util.SaveAttachmentTask;
 import org.thoughtcrime.securesms.util.SaveAttachmentTask.Attachment;
 import org.whispersystems.textsecure.crypto.MasterSecret;
+import org.whispersystems.textsecure.util.FutureTaskListener;
 
 import java.sql.Date;
 import java.text.SimpleDateFormat;
@@ -242,14 +243,20 @@ public class ConversationFragment extends SherlockListFragment
     SaveAttachmentTask.showWarningDialog(getActivity(), new DialogInterface.OnClickListener() {
       public void onClick(DialogInterface dialog, int which) {
 
-        final Slide slide = message.getMediaSlideSync();
-        if (slide == null) {
-          Log.w(TAG, "No slide with attachable media found, failing nicely.");
-          Toast.makeText(getActivity(), R.string.ConversationFragment_error_while_saving_attachment_to_sd_card, Toast.LENGTH_LONG).show();
-          return;
-        }
-        SaveAttachmentTask saveTask = new SaveAttachmentTask(getActivity(), masterSecret);
-        saveTask.execute(new Attachment(slide.getUri(), slide.getContentType(), message.getDateReceived()));
+        message.fetchMediaSlide(new FutureTaskListener<Slide>() {
+          @Override
+          public void onSuccess(Slide slide) {
+            SaveAttachmentTask saveTask = new SaveAttachmentTask(getActivity(), masterSecret);
+            saveTask.execute(new Attachment(slide.getUri(), slide.getContentType(), message.getDateReceived()));
+          }
+
+          @Override
+          public void onFailure(Throwable error) {
+            Log.w(TAG, "No slide with attachable media found, failing nicely.");
+            Log.w(TAG, error);
+            Toast.makeText(getActivity(), R.string.ConversationFragment_error_while_saving_attachment_to_sd_card, Toast.LENGTH_LONG).show();
+          }
+        });
       }
     });
   }

src/org/thoughtcrime/securesms/ConversationItem.java

@@ -107,6 +107,7 @@ public class ConversationItem extends LinearLayout {
   private  Button    mmsDownloadButton;
   private  TextView  mmsDownloadingLabel;
   private  ListenableFutureTask<SlideDeck> slideDeck;
+  private  FutureTaskListener<SlideDeck> slideDeckListener;
   private  TypedArray backgroundDrawables;
 
   private final FailedIconClickListener failedIconClickListener         = new FailedIconClickListener();
@@ -181,8 +182,8 @@ public class ConversationItem extends LinearLayout {
   }
 
   public void unbind() {
-    if (slideDeck != null)
-      slideDeck.setListener(null);
+    if (slideDeck != null && slideDeckListener != null)
+      slideDeck.removeListener(slideDeckListener);
   }
 
   public MessageRecord getMessageRecord() {
@@ -345,7 +346,7 @@ public class ConversationItem extends LinearLayout {
     }
 
     slideDeck = messageRecord.getSlideDeckFuture();
-    slideDeck.setListener(new FutureTaskListener<SlideDeck>() {
+    slideDeckListener = new FutureTaskListener<SlideDeck>() {
       @Override
       public void onSuccess(final SlideDeck result) {
         if (result == null)
@@ -376,7 +377,8 @@ public class ConversationItem extends LinearLayout {
 
       @Override
       public void onFailure(Throwable error) {}
-    });
+    };
+    slideDeck.addListener(slideDeckListener);
   }
 
   /// Helper Methods

src/org/thoughtcrime/securesms/database/MmsDatabase.java

@@ -1064,7 +1064,7 @@ public class MmsDatabase extends Database implements MmsSmsColumns {
         }
       };
 
-      future = new ListenableFutureTask<SlideDeck>(task, null);
+      future = new ListenableFutureTask<SlideDeck>(task);
       slideResolver.execute(future);
 
       return future;
@@ -1084,7 +1084,7 @@ public class MmsDatabase extends Database implements MmsSmsColumns {
             }
           };
 
-          ListenableFutureTask<SlideDeck> future = new ListenableFutureTask<SlideDeck>(task, null);
+          ListenableFutureTask<SlideDeck> future = new ListenableFutureTask<SlideDeck>(task);
           future.run();
 
           return future;

src/org/thoughtcrime/securesms/database/model/MediaMmsMessageRecord.java

@@ -22,10 +22,13 @@ import android.util.Log;
 
 import org.thoughtcrime.securesms.R;
 import org.thoughtcrime.securesms.database.MmsDatabase;
+import org.thoughtcrime.securesms.mms.MediaNotFoundException;
 import org.thoughtcrime.securesms.mms.Slide;
 import org.thoughtcrime.securesms.mms.SlideDeck;
 import org.thoughtcrime.securesms.recipients.Recipient;
 import org.thoughtcrime.securesms.recipients.Recipients;
+import org.whispersystems.textsecure.push.exceptions.NotFoundException;
+import org.whispersystems.textsecure.util.FutureTaskListener;
 import org.whispersystems.textsecure.util.ListenableFutureTask;
 
 import java.util.List;
@@ -82,21 +85,26 @@ public class MediaMmsMessageRecord extends MessageRecord {
     return deck != null && deck.containsMediaSlide();
   }
 
-  public Slide getMediaSlideSync() {
-    SlideDeck deck = getSlideDeckSync();
-    if (deck == null) {
-      return null;
-    }
-    List<Slide> slides = deck.getSlides();
 
-    for (Slide slide : slides) {
-      if (slide.hasImage() || slide.hasVideo() || slide.hasAudio()) {
-        return slide;
+  public void fetchMediaSlide(final FutureTaskListener<Slide> listener) {
+    slideDeckFutureTask.addListener(new FutureTaskListener<SlideDeck>() {
+      @Override
+      public void onSuccess(SlideDeck deck) {
+        for (Slide slide : deck.getSlides()) {
+          if (slide.hasImage() || slide.hasVideo() || slide.hasAudio()) {
+            listener.onSuccess(slide);
+            return;
+          }
+        }
+        listener.onFailure(new MediaNotFoundException("no media slide found"));
       }
-    }
-    return null;
-  }
 
+      @Override
+      public void onFailure(Throwable error) {
+        listener.onFailure(error);
+      }
+    });
+  }
 
   public int getPartCount() {
     return partCount;

src/org/thoughtcrime/securesms/mms/MediaNotFoundException.java

@@ -0,0 +1,36 @@
+/** 
+ * Copyright (C) 2014 Open Whisper Systems
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package org.thoughtcrime.securesms.mms;
+
+public class MediaNotFoundException extends Exception {
+
+  public MediaNotFoundException() {
+  }
+
+  public MediaNotFoundException(String detailMessage) {
+    super(detailMessage);
+  }
+
+  public MediaNotFoundException(Throwable throwable) {
+    super(throwable);
+  }
+
+  public MediaNotFoundException(String detailMessage, Throwable throwable) {
+    super(detailMessage, throwable);
+  }
+
+}

src/org/thoughtcrime/securesms/recipients/Recipient.java

@@ -67,7 +67,7 @@ public class Recipient implements Parcelable, CanonicalRecipient {
     this.contactPhoto               = contactPhoto;
     this.recipientId                = recipientId;
 
-    future.setListener(new FutureTaskListener<RecipientDetails>() {
+    future.addListener(new FutureTaskListener<RecipientDetails>() {
       @Override
       public void onSuccess(RecipientDetails result) {
         if (result != null) {

src/org/thoughtcrime/securesms/recipients/RecipientProvider.java

@@ -105,7 +105,7 @@ public class RecipientProvider {
       }
     };
 
-    ListenableFutureTask<RecipientDetails> future = new ListenableFutureTask<RecipientDetails>(task, null);
+    ListenableFutureTask<RecipientDetails> future = new ListenableFutureTask<RecipientDetails>(task);
 
     asyncRecipientResolver.submit(future);