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

   1 /* ownCloud Android client application
   2  *   Copyright (C) 2012-2014 ownCloud Inc.
   3  *
   4  *   This program is free software: you can redistribute it and/or modify
   5  *   it under the terms of the GNU General Public License version 2,
   6  *   as published by the Free Software Foundation.
   7  *
   8  *   This program is distributed in the hope that it will be useful,
   9  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  *   GNU General Public License for more details.
  12  *
  13  *   You should have received a copy of the GNU General Public License
  14  *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
  15  *
  16  */
  17
  18 package com.owncloud.android.datamodel;
  19
  20 import java.io.File;
  21 import java.lang.ref.WeakReference;
  22
  23 import org.apache.commons.httpclient.HttpStatus;
  24 import org.apache.commons.httpclient.methods.GetMethod;
  25
  26 import android.accounts.Account;
  27 import android.accounts.AccountManager;
  28 import android.content.res.Resources;
  29 import android.graphics.Bitmap;
  30 import android.graphics.Bitmap.CompressFormat;
  31 import android.graphics.BitmapFactory;
  32 import android.graphics.drawable.BitmapDrawable;
  33 import android.graphics.drawable.Drawable;
  34 import android.media.ThumbnailUtils;
  35 import android.net.Uri;
  36 import android.os.AsyncTask;
  37 import android.widget.ImageView;
  38
  39 import com.owncloud.android.MainApp;
  40 import com.owncloud.android.R;
  41 import com.owncloud.android.lib.common.OwnCloudAccount;
  42 import com.owncloud.android.lib.common.OwnCloudClient;
  43 import com.owncloud.android.lib.common.OwnCloudClientManagerFactory;
  44 import com.owncloud.android.lib.common.accounts.AccountUtils.Constants;
  45 import com.owncloud.android.lib.common.utils.Log_OC;
  46 import com.owncloud.android.lib.resources.status.OwnCloudVersion;
  47 import com.owncloud.android.ui.adapter.DiskLruImageCache;
  48 import com.owncloud.android.utils.BitmapUtils;
  49 import com.owncloud.android.utils.DisplayUtils;
  50
  51 /**
  52  * Manager for concurrent access to thumbnails cache.
  53  *
  54  * @author Tobias Kaminsky
  55  * @author David A. Velasco
  56  */
  57 public class ThumbnailsCacheManager {
  58
  59     private static final String TAG = ThumbnailsCacheManager.class.getSimpleName();
  60
  61     private static final String CACHE_FOLDER = "thumbnailCache";
  62     private static final String MINOR_SERVER_VERSION_FOR_THUMBS = "7.8.0";
  63
  64     private static final Object mThumbnailsDiskCacheLock = new Object();
  65     private static DiskLruImageCache mThumbnailCache = null;
  66     private static boolean mThumbnailCacheStarting = true;
  67
  68     private static final int DISK_CACHE_SIZE = 1024 * 1024 * 10; // 10MB
  69     private static final CompressFormat mCompressFormat = CompressFormat.JPEG;
  70     private static final int mCompressQuality = 70;
  71     private static OwnCloudClient mClient = null;
  72     private static String mServerVersion = null;
  73
  74     public static Bitmap mDefaultImg =
  75             BitmapFactory.decodeResource(
  76                     MainApp.getAppContext().getResources(),
  77                     DisplayUtils.getFileTypeIconId("image/png", "default.png")
  78             );
  79
  80
  81     public static class InitDiskCacheTask extends AsyncTask<File, Void, Void> {
  82
  83         @Override
  84         protected Void doInBackground(File... params) {
  85             synchronized (mThumbnailsDiskCacheLock) {
  86                 mThumbnailCacheStarting = true;
  87
  88                 if (mThumbnailCache == null) {
  89                     try {
  90                         // Check if media is mounted or storage is built-in, if so,
  91                         // try and use external cache dir; otherwise use internal cache dir
  92                         final String cachePath =
  93                                 MainApp.getAppContext().getExternalCacheDir().getPath() +
  94                                 File.separator + CACHE_FOLDER;
  95                         Log_OC.d(TAG, "create dir: " + cachePath);
  96                         final File diskCacheDir = new File(cachePath);
  97                         mThumbnailCache = new DiskLruImageCache(
  98                                 diskCacheDir,
  99                                 DISK_CACHE_SIZE,
 100                                 mCompressFormat,
 101                                 mCompressQuality
 102                         );
 103                     } catch (Exception e) {
 104                         Log_OC.d(TAG, "Thumbnail cache could not be opened ", e);
 105                         mThumbnailCache = null;
 106                     }
 107                 }
 108                 mThumbnailCacheStarting = false; // Finished initialization
 109                 mThumbnailsDiskCacheLock.notifyAll(); // Wake any waiting threads
 110             }
 111             return null;
 112         }
 113     }
 114
 115
 116     public static void addBitmapToCache(String key, Bitmap bitmap) {
 117         synchronized (mThumbnailsDiskCacheLock) {
 118             if (mThumbnailCache != null) {
 119                 mThumbnailCache.put(key, bitmap);
 120             }
 121         }
 122     }
 123
 124
 125     public static Bitmap getBitmapFromDiskCache(String key) {
 126         synchronized (mThumbnailsDiskCacheLock) {
 127             // Wait while disk cache is started from background thread
 128             while (mThumbnailCacheStarting) {
 129                 try {
 130                     mThumbnailsDiskCacheLock.wait();
 131                 } catch (InterruptedException e) {}
 132             }
 133             if (mThumbnailCache != null) {
 134                 return (Bitmap) mThumbnailCache.getBitmap(key);
 135             }
 136         }
 137         return null;
 138     }
 139
 140     public static class ThumbnailGenerationTask extends AsyncTask<Object, Void, Bitmap> {
 141         private final WeakReference<ImageView> mImageViewReference;
 142         private static Account mAccount;
 143         private Object mFile;
 144         private FileDataStorageManager mStorageManager;
 145
 146
 147         public ThumbnailGenerationTask(ImageView imageView, FileDataStorageManager storageManager, Account account) {
 148             // Use a WeakReference to ensure the ImageView can be garbage collected
 149             mImageViewReference = new WeakReference<ImageView>(imageView);
 150             if (storageManager == null)
 151                 throw new IllegalArgumentException("storageManager must not be NULL");
 152             mStorageManager = storageManager;
 153             mAccount = account;
 154         }
 155
 156         public ThumbnailGenerationTask(ImageView imageView) {
 157             // Use a WeakReference to ensure the ImageView can be garbage collected
 158             mImageViewReference = new WeakReference<ImageView>(imageView);
 159         }
 160
 161         @Override
 162         protected Bitmap doInBackground(Object... params) {
 163             Bitmap thumbnail = null;
 164
 165             try {
 166                 if (mAccount != null) {
 167                     AccountManager accountMgr = AccountManager.get(MainApp.getAppContext());
 168
 169                     mServerVersion = accountMgr.getUserData(mAccount, Constants.KEY_OC_VERSION);
 170                     OwnCloudAccount ocAccount = new OwnCloudAccount(mAccount, MainApp.getAppContext());
 171                     mClient = OwnCloudClientManagerFactory.getDefaultSingleton().
 172                             getClientFor(ocAccount, MainApp.getAppContext());
 173                 }
 174
 175                 mFile = params[0];
 176
 177                 if (mFile instanceof OCFile) {
 178                     thumbnail = doOCFileInBackground();
 179                 }  else if (mFile instanceof File) {
 180                     thumbnail = doFileInBackground();
 181                 } else {
 182                     // do nothing
 183                 }
 184
 185                 }catch(Throwable t){
 186                     // the app should never break due to a problem with thumbnails
 187                     Log_OC.e(TAG, "Generation of thumbnail for " + mFile + " failed", t);
 188                     if (t instanceof OutOfMemoryError) {
 189                         System.gc();
 190                     }
 191                 }
 192
 193             return thumbnail;
 194         }
 195
 196         protected void onPostExecute(Bitmap bitmap){
 197             if (isCancelled()) {
 198                 bitmap = null;
 199             }
 200
 201             if (mImageViewReference != null && bitmap != null) {
 202                 final ImageView imageView = mImageViewReference.get();
 203                 final ThumbnailGenerationTask bitmapWorkerTask = getBitmapWorkerTask(imageView);
 204                 if (this == bitmapWorkerTask && imageView != null) {
 205                     String tagId = "";
 206                     if (mFile instanceof OCFile){
 207                         tagId = String.valueOf(((OCFile)mFile).getFileId());
 208                     } else if (mFile instanceof File){
 209                         tagId = String.valueOf(((File)mFile).hashCode());
 210                     }
 211                     if (String.valueOf(imageView.getTag()).equals(tagId)) {
 212                         imageView.setImageBitmap(bitmap);
 213                     }
 214                 }
 215             }
 216         }
 217
 218         /**
 219          * Add thumbnail to cache
 220          * @param imageKey: thumb key
 221          * @param bitmap:   image for extracting thumbnail
 222          * @param path:     image path
 223          * @param px:       thumbnail dp
 224          * @return Bitmap
 225          */
 226         private Bitmap addThumbnailToCache(String imageKey, Bitmap bitmap, String path, int px){
 227
 228             Bitmap thumbnail = ThumbnailUtils.extractThumbnail(bitmap, px, px);
 229
 230             // Rotate image, obeying exif tag
 231             thumbnail = BitmapUtils.rotateImage(thumbnail,path);
 232
 233             // Add thumbnail to cache
 234             addBitmapToCache(imageKey, thumbnail);
 235
 236             return thumbnail;
 237         }
 238
 239         /**
 240          * Converts size of file icon from dp to pixel
 241          * @return int
 242          */
 243         private int getThumbnailDimension(){
 244             // Converts dp to pixel
 245             Resources r = MainApp.getAppContext().getResources();
 246             return (int) Math.round(r.getDimension(R.dimen.file_icon_size_grid));
 247         }
 248
 249         private Bitmap doOCFileInBackground() {
 250             Bitmap thumbnail = null;
 251             OCFile file = (OCFile)mFile;
 252
 253             final String imageKey = String.valueOf(file.getRemoteId());
 254
 255             // Check disk cache in background thread
 256             thumbnail = getBitmapFromDiskCache(imageKey);
 257
 258             // Not found in disk cache
 259             if (thumbnail == null || file.needsUpdateThumbnail()) {
 260
 261                 int px = getThumbnailDimension();
 262
 263                 if (file.isDown()) {
 264                     Bitmap bitmap = BitmapUtils.decodeSampledBitmapFromFile(
 265                             file.getStoragePath(), px, px);
 266
 267                     if (bitmap != null) {
 268                         thumbnail = addThumbnailToCache(imageKey, bitmap, file.getStoragePath(), px);
 269
 270                         file.setNeedsUpdateThumbnail(false);
 271                         mStorageManager.saveFile(file);
 272                     }
 273
 274                 } else {
 275                     // Download thumbnail from server
 276                     if (mClient != null && mServerVersion != null) {
 277                         OwnCloudVersion serverOCVersion = new OwnCloudVersion(mServerVersion);
 278                         if (serverOCVersion.compareTo(new OwnCloudVersion(MINOR_SERVER_VERSION_FOR_THUMBS)) >= 0) {
 279                             try {
 280                                 int status = -1;
 281
 282                                 String uri = mClient.getBaseUri() + "/index.php/apps/files/api/v1/thumbnail/" +
 283                                         px + "/" + px + Uri.encode(file.getRemotePath(), "/");
 284                                 Log_OC.d("Thumbnail", "URI: " + uri);
 285                                 GetMethod get = new GetMethod(uri);
 286                                 status = mClient.executeMethod(get);
 287                                 if (status == HttpStatus.SC_OK) {
 288                                     byte[] bytes = get.getResponseBody();
 289                                     Bitmap bitmap = BitmapFactory.decodeByteArray(bytes, 0, bytes.length);
 290                                     thumbnail = ThumbnailUtils.extractThumbnail(bitmap, px, px);
 291
 292                                     // Add thumbnail to cache
 293                                     if (thumbnail != null) {
 294                                         addBitmapToCache(imageKey, thumbnail);
 295                                     }
 296                                 }
 297                             } catch (Exception e) {
 298                                 e.printStackTrace();
 299                             }
 300                         } else {
 301                             Log_OC.d(TAG, "Server too old");
 302                         }
 303                     }
 304                 }
 305             }
 306
 307             return thumbnail;
 308
 309         }
 310
 311         private Bitmap doFileInBackground() {
 312             Bitmap thumbnail = null;
 313             File file = (File)mFile;
 314
 315             final String imageKey = String.valueOf(file.hashCode());
 316
 317             // Check disk cache in background thread
 318             thumbnail = getBitmapFromDiskCache(imageKey);
 319
 320             // Not found in disk cache
 321             if (thumbnail == null) {
 322
 323                 int px = getThumbnailDimension();
 324
 325                 Bitmap bitmap = BitmapUtils.decodeSampledBitmapFromFile(
 326                         file.getAbsolutePath(), px, px);
 327
 328                 if (bitmap != null) {
 329                     thumbnail = addThumbnailToCache(imageKey, bitmap, file.getPath(), px);
 330                 }
 331             }
 332             return thumbnail;
 333         }
 334
 335     }
 336
 337     public static boolean cancelPotentialWork(Object file, ImageView imageView) {
 338         final ThumbnailGenerationTask bitmapWorkerTask = getBitmapWorkerTask(imageView);
 339
 340         if (bitmapWorkerTask != null) {
 341             final Object bitmapData = bitmapWorkerTask.mFile;
 342             // If bitmapData is not yet set or it differs from the new data
 343             if (bitmapData == null || bitmapData != file) {
 344                 // Cancel previous task
 345                 bitmapWorkerTask.cancel(true);
 346             } else {
 347                 // The same work is already in progress
 348                 return false;
 349             }
 350         }
 351         // No task associated with the ImageView, or an existing task was cancelled
 352         return true;
 353     }
 354
 355     public static ThumbnailGenerationTask getBitmapWorkerTask(ImageView imageView) {
 356         if (imageView != null) {
 357             final Drawable drawable = imageView.getDrawable();
 358             if (drawable instanceof AsyncDrawable) {
 359                 final AsyncDrawable asyncDrawable = (AsyncDrawable) drawable;
 360                 return asyncDrawable.getBitmapWorkerTask();
 361             }
 362         }
 363         return null;
 364     }
 365
 366     public static class AsyncDrawable extends BitmapDrawable {
 367         private final WeakReference<ThumbnailGenerationTask> bitmapWorkerTaskReference;
 368
 369         public AsyncDrawable(
 370                 Resources res, Bitmap bitmap, ThumbnailGenerationTask bitmapWorkerTask
 371         ) {
 372
 373             super(res, bitmap);
 374             bitmapWorkerTaskReference =
 375                     new WeakReference<ThumbnailGenerationTask>(bitmapWorkerTask);
 376         }
 377
 378         public ThumbnailGenerationTask getBitmapWorkerTask() {
 379             return bitmapWorkerTaskReference.get();
 380         }
 381     }
 382 }