src/com/owncloud/android/datamodel/ThumbnailsCacheManager.java

   1 /**
   2  *   ownCloud Android client application
   3  *
   4  *   @author Tobias Kaminsky
   5  *   @author David A. Velasco
   6  *   Copyright (C) 2015 ownCloud Inc.
   7  *
   8  *   This program is free software: you can redistribute it and/or modify
   9  *   it under the terms of the GNU General Public License version 2,
  10  *   as published by the Free Software Foundation.
  11  *
  12  *   This program is distributed in the hope that it will be useful,
  13  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *   GNU General Public License for more details.
  16  *
  17  *   You should have received a copy of the GNU General Public License
  18  *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19  *
  20  */
  21
  22 package com.owncloud.android.datamodel;
  23
  24 import java.io.File;
  25 import java.lang.ref.WeakReference;
  26
  27 import org.apache.commons.httpclient.HttpStatus;
  28 import org.apache.commons.httpclient.methods.GetMethod;
  29
  30 import android.accounts.Account;
  31 import android.accounts.AccountManager;
  32 import android.content.res.Resources;
  33 import android.graphics.Bitmap;
  34 import android.graphics.Bitmap.CompressFormat;
  35 import android.graphics.BitmapFactory;
  36 import android.graphics.drawable.BitmapDrawable;
  37 import android.graphics.drawable.Drawable;
  38 import android.media.ThumbnailUtils;
  39 import android.net.Uri;
  40 import android.os.AsyncTask;
  41 import android.widget.ImageView;
  42
  43 import com.owncloud.android.MainApp;
  44 import com.owncloud.android.R;
  45 import com.owncloud.android.lib.common.OwnCloudAccount;
  46 import com.owncloud.android.lib.common.OwnCloudClient;
  47 import com.owncloud.android.lib.common.OwnCloudClientManagerFactory;
  48 import com.owncloud.android.lib.common.accounts.AccountUtils.Constants;
  49 import com.owncloud.android.lib.common.utils.Log_OC;
  50 import com.owncloud.android.lib.resources.status.OwnCloudVersion;
  51 import com.owncloud.android.ui.adapter.DiskLruImageCache;
  52 import com.owncloud.android.utils.BitmapUtils;
  53 import com.owncloud.android.utils.DisplayUtils;
  54
  55 /**
  56  * Manager for concurrent access to thumbnails cache.
  57  */
  58 public class ThumbnailsCacheManager {
  59
  60     private static final String TAG = ThumbnailsCacheManager.class.getSimpleName();
  61
  62     private static final String CACHE_FOLDER = "thumbnailCache";
  63     private static final String MINOR_SERVER_VERSION_FOR_THUMBS = "7.8.0";
  64
  65     private static final Object mThumbnailsDiskCacheLock = new Object();
  66     private static DiskLruImageCache mThumbnailCache = null;
  67     private static boolean mThumbnailCacheStarting = true;
  68
  69     private static final int DISK_CACHE_SIZE = 1024 * 1024 * 10; // 10MB
  70     private static final CompressFormat mCompressFormat = CompressFormat.JPEG;
  71     private static final int mCompressQuality = 70;
  72     private static OwnCloudClient mClient = null;
  73     private static String mServerVersion = null;
  74
  75     public static Bitmap mDefaultImg =
  76             BitmapFactory.decodeResource(
  77                     MainApp.getAppContext().getResources(),
  78                     DisplayUtils.getFileTypeIconId("image/png", "default.png")
  79             );
  80
  81
  82     public static class InitDiskCacheTask extends AsyncTask<File, Void, Void> {
  83
  84         @Override
  85         protected Void doInBackground(File... params) {
  86             synchronized (mThumbnailsDiskCacheLock) {
  87                 mThumbnailCacheStarting = true;
  88
  89                 if (mThumbnailCache == null) {
  90                     try {
  91                         // Check if media is mounted or storage is built-in, if so,
  92                         // try and use external cache dir; otherwise use internal cache dir
  93                         final String cachePath =
  94                                 MainApp.getAppContext().getExternalCacheDir().getPath() +
  95                                 File.separator + CACHE_FOLDER;
  96                         Log_OC.d(TAG, "create dir: " + cachePath);
  97                         final File diskCacheDir = new File(cachePath);
  98                         mThumbnailCache = new DiskLruImageCache(
  99                                 diskCacheDir,
 100                                 DISK_CACHE_SIZE,
 101                                 mCompressFormat,
 102                                 mCompressQuality
 103                         );
 104                     } catch (Exception e) {
 105                         Log_OC.d(TAG, "Thumbnail cache could not be opened ", e);
 106                         mThumbnailCache = null;
 107                     }
 108                 }
 109                 mThumbnailCacheStarting = false; // Finished initialization
 110                 mThumbnailsDiskCacheLock.notifyAll(); // Wake any waiting threads
 111             }
 112             return null;
 113         }
 114     }
 115
 116
 117     public static void addBitmapToCache(String key, Bitmap bitmap) {
 118         synchronized (mThumbnailsDiskCacheLock) {
 119             if (mThumbnailCache != null) {
 120                 mThumbnailCache.put(key, bitmap);
 121             }
 122         }
 123     }
 124
 125
 126     public static Bitmap getBitmapFromDiskCache(String key) {
 127         synchronized (mThumbnailsDiskCacheLock) {
 128             // Wait while disk cache is started from background thread
 129             while (mThumbnailCacheStarting) {
 130                 try {
 131                     mThumbnailsDiskCacheLock.wait();
 132                 } catch (InterruptedException e) {}
 133             }
 134             if (mThumbnailCache != null) {
 135                 return (Bitmap) mThumbnailCache.getBitmap(key);
 136             }
 137         }
 138         return null;
 139     }
 140
 141     public static class ThumbnailGenerationTask extends AsyncTask<Object, Void, Bitmap> {
 142         private final WeakReference<ImageView> mImageViewReference;
 143         private static Account mAccount;
 144         private Object mFile;
 145         private FileDataStorageManager mStorageManager;
 146
 147
 148         public ThumbnailGenerationTask(ImageView imageView, FileDataStorageManager storageManager, Account account) {
 149             // Use a WeakReference to ensure the ImageView can be garbage collected
 150             mImageViewReference = new WeakReference<ImageView>(imageView);
 151             if (storageManager == null)
 152                 throw new IllegalArgumentException("storageManager must not be NULL");
 153             mStorageManager = storageManager;
 154             mAccount = account;
 155         }
 156
 157         public ThumbnailGenerationTask(ImageView imageView) {
 158             // Use a WeakReference to ensure the ImageView can be garbage collected
 159             mImageViewReference = new WeakReference<ImageView>(imageView);
 160         }
 161
 162         @Override
 163         protected Bitmap doInBackground(Object... params) {
 164             Bitmap thumbnail = null;
 165
 166             try {
 167                 if (mAccount != null) {
 168                     AccountManager accountMgr = AccountManager.get(MainApp.getAppContext());
 169
 170                     mServerVersion = accountMgr.getUserData(mAccount, Constants.KEY_OC_VERSION);
 171                     OwnCloudAccount ocAccount = new OwnCloudAccount(mAccount, MainApp.getAppContext());
 172                     mClient = OwnCloudClientManagerFactory.getDefaultSingleton().
 173                             getClientFor(ocAccount, MainApp.getAppContext());
 174                 }
 175
 176                 mFile = params[0];
 177
 178                 if (mFile instanceof OCFile) {
 179                     thumbnail = doOCFileInBackground();
 180                 }  else if (mFile instanceof File) {
 181                     thumbnail = doFileInBackground();
 182                 } else {
 183                     // do nothing
 184                 }
 185
 186                 }catch(Throwable t){
 187                     // the app should never break due to a problem with thumbnails
 188                     Log_OC.e(TAG, "Generation of thumbnail for " + mFile + " failed", t);
 189                     if (t instanceof OutOfMemoryError) {
 190                         System.gc();
 191                     }
 192                 }
 193
 194             return thumbnail;
 195         }
 196
 197         protected void onPostExecute(Bitmap bitmap){
 198             if (isCancelled()) {
 199                 bitmap = null;
 200             }
 201
 202             if (mImageViewReference != null && bitmap != null) {
 203                 final ImageView imageView = mImageViewReference.get();
 204                 final ThumbnailGenerationTask bitmapWorkerTask = getBitmapWorkerTask(imageView);
 205                 if (this == bitmapWorkerTask && imageView != null) {
 206                     String tagId = "";
 207                     if (mFile instanceof OCFile){
 208                         tagId = String.valueOf(((OCFile)mFile).getFileId());
 209                     } else if (mFile instanceof File){
 210                         tagId = String.valueOf(((File)mFile).hashCode());
 211                     }
 212                     if (String.valueOf(imageView.getTag()).equals(tagId)) {
 213                         imageView.setImageBitmap(bitmap);
 214                     }
 215                 }
 216             }
 217         }
 218
 219         /**
 220          * Add thumbnail to cache
 221          * @param imageKey: thumb key
 222          * @param bitmap:   image for extracting thumbnail
 223          * @param path:     image path
 224          * @param px:       thumbnail dp
 225          * @return Bitmap
 226          */
 227         private Bitmap addThumbnailToCache(String imageKey, Bitmap bitmap, String path, int px){
 228
 229             Bitmap thumbnail = ThumbnailUtils.extractThumbnail(bitmap, px, px);
 230
 231             // Rotate image, obeying exif tag
 232             thumbnail = BitmapUtils.rotateImage(thumbnail,path);
 233
 234             // Add thumbnail to cache
 235             addBitmapToCache(imageKey, thumbnail);
 236
 237             return thumbnail;
 238         }
 239
 240         /**
 241          * Converts size of file icon from dp to pixel
 242          * @return int
 243          */
 244         private int getThumbnailDimension(){
 245             // Converts dp to pixel
 246             Resources r = MainApp.getAppContext().getResources();
 247             return (int) Math.round(r.getDimension(R.dimen.file_icon_size_grid));
 248         }
 249
 250         private Bitmap doOCFileInBackground() {
 251             Bitmap thumbnail = null;
 252             OCFile file = (OCFile)mFile;
 253
 254             final String imageKey = String.valueOf(file.getRemoteId());
 255
 256             // Check disk cache in background thread
 257             thumbnail = getBitmapFromDiskCache(imageKey);
 258
 259             // Not found in disk cache
 260             if (thumbnail == null || file.needsUpdateThumbnail()) {
 261
 262                 int px = getThumbnailDimension();
 263
 264                 if (file.isDown()) {
 265                     Bitmap bitmap = BitmapUtils.decodeSampledBitmapFromFile(
 266                             file.getStoragePath(), px, px);
 267
 268                     if (bitmap != null) {
 269                         thumbnail = addThumbnailToCache(imageKey, bitmap, file.getStoragePath(), px);
 270
 271                         file.setNeedsUpdateThumbnail(false);
 272                         mStorageManager.saveFile(file);
 273                     }
 274
 275                 } else {
 276                     // Download thumbnail from server
 277                     if (mClient != null && mServerVersion != null) {
 278                         OwnCloudVersion serverOCVersion = new OwnCloudVersion(mServerVersion);
 279                         if (serverOCVersion.compareTo(new OwnCloudVersion(MINOR_SERVER_VERSION_FOR_THUMBS)) >= 0) {
 280                             try {
 281                                 int status = -1;
 282
 283                                 String uri = mClient.getBaseUri() + "/index.php/apps/files/api/v1/thumbnail/" +
 284                                         px + "/" + px + Uri.encode(file.getRemotePath(), "/");
 285                                 Log_OC.d("Thumbnail", "URI: " + uri);
 286                                 GetMethod get = new GetMethod(uri);
 287                                 status = mClient.executeMethod(get);
 288                                 if (status == HttpStatus.SC_OK) {
 289                                     byte[] bytes = get.getResponseBody();
 290                                     Bitmap bitmap = BitmapFactory.decodeByteArray(bytes, 0, bytes.length);
 291                                     thumbnail = ThumbnailUtils.extractThumbnail(bitmap, px, px);
 292
 293                                     // Add thumbnail to cache
 294                                     if (thumbnail != null) {
 295                                         addBitmapToCache(imageKey, thumbnail);
 296                                     }
 297                                 }
 298                             } catch (Exception e) {
 299                                 e.printStackTrace();
 300                             }
 301                         } else {
 302                             Log_OC.d(TAG, "Server too old");
 303                         }
 304                     }
 305                 }
 306             }
 307
 308             return thumbnail;
 309
 310         }
 311
 312         private Bitmap doFileInBackground() {
 313             Bitmap thumbnail = null;
 314             File file = (File)mFile;
 315
 316             final String imageKey = String.valueOf(file.hashCode());
 317
 318             // Check disk cache in background thread
 319             thumbnail = getBitmapFromDiskCache(imageKey);
 320
 321             // Not found in disk cache
 322             if (thumbnail == null) {
 323
 324                 int px = getThumbnailDimension();
 325
 326                 Bitmap bitmap = BitmapUtils.decodeSampledBitmapFromFile(
 327                         file.getAbsolutePath(), px, px);
 328
 329                 if (bitmap != null) {
 330                     thumbnail = addThumbnailToCache(imageKey, bitmap, file.getPath(), px);
 331                 }
 332             }
 333             return thumbnail;
 334         }
 335
 336     }
 337
 338     public static boolean cancelPotentialWork(Object file, ImageView imageView) {
 339         final ThumbnailGenerationTask bitmapWorkerTask = getBitmapWorkerTask(imageView);
 340
 341         if (bitmapWorkerTask != null) {
 342             final Object bitmapData = bitmapWorkerTask.mFile;
 343             // If bitmapData is not yet set or it differs from the new data
 344             if (bitmapData == null || bitmapData != file) {
 345                 // Cancel previous task
 346                 bitmapWorkerTask.cancel(true);
 347             } else {
 348                 // The same work is already in progress
 349                 return false;
 350             }
 351         }
 352         // No task associated with the ImageView, or an existing task was cancelled
 353         return true;
 354     }
 355
 356     public static ThumbnailGenerationTask getBitmapWorkerTask(ImageView imageView) {
 357         if (imageView != null) {
 358             final Drawable drawable = imageView.getDrawable();
 359             if (drawable instanceof AsyncDrawable) {
 360                 final AsyncDrawable asyncDrawable = (AsyncDrawable) drawable;
 361                 return asyncDrawable.getBitmapWorkerTask();
 362             }
 363         }
 364         return null;
 365     }
 366
 367     public static class AsyncDrawable extends BitmapDrawable {
 368         private final WeakReference<ThumbnailGenerationTask> bitmapWorkerTaskReference;
 369
 370         public AsyncDrawable(
 371                 Resources res, Bitmap bitmap, ThumbnailGenerationTask bitmapWorkerTask
 372         ) {
 373
 374             super(res, bitmap);
 375             bitmapWorkerTaskReference =
 376                     new WeakReference<ThumbnailGenerationTask>(bitmapWorkerTask);
 377         }
 378
 379         public ThumbnailGenerationTask getBitmapWorkerTask() {
 380             return bitmapWorkerTaskReference.get();
 381         }
 382     }
 383 }