src/com/owncloud/android/files/services/FileObserverService.java

   1 /* ownCloud Android client application
   2  *   Copyright (C) 2012 Bartek Przybylski
   3  *   Copyright (C) 2012-2013 ownCloud Inc.
   4  *
   5  *   This program is free software: you can redistribute it and/or modify
   6  *   it under the terms of the GNU General Public License version 2,
   7  *   as published by the Free Software Foundation.
   8  *
   9  *   This program is distributed in the hope that it will be useful,
  10  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  *   GNU General Public License for more details.
  13  *
  14  *   You should have received a copy of the GNU General Public License
  15  *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  *
  17  */
  18
  19 package com.owncloud.android.files.services;
  20
  21 import java.io.File;
  22 import java.util.HashMap;
  23 import java.util.Map;
  24
  25 import com.owncloud.android.datamodel.FileDataStorageManager;
  26 import com.owncloud.android.datamodel.OCFile;
  27 import com.owncloud.android.db.ProviderMeta.ProviderTableMeta;
  28 import com.owncloud.android.files.OwnCloudFileObserver;
  29 import com.owncloud.android.operations.SynchronizeFileOperation;
  30 import com.owncloud.android.utils.FileStorageUtils;
  31 import com.owncloud.android.utils.Log_OC;
  32
  33
  34 import android.accounts.Account;
  35 import android.accounts.AccountManager;
  36 import android.app.Service;
  37 import android.content.BroadcastReceiver;
  38 import android.content.Context;
  39 import android.content.Intent;
  40 import android.content.IntentFilter;
  41 import android.database.Cursor;
  42 import android.os.Binder;
  43 import android.os.IBinder;
  44
  45 public class FileObserverService extends Service {
  46
  47     public final static int CMD_INIT_OBSERVED_LIST = 1;
  48     public final static int CMD_ADD_OBSERVED_FILE = 2;
  49     public final static int CMD_DEL_OBSERVED_FILE = 3;
  50
  51     public final static String KEY_FILE_CMD = "KEY_FILE_CMD";
  52     public final static String KEY_CMD_ARG_FILE = "KEY_CMD_ARG_FILE";
  53     public final static String KEY_CMD_ARG_ACCOUNT = "KEY_CMD_ARG_ACCOUNT";
  54
  55     private static String TAG = FileObserverService.class.getSimpleName();
  56
  57     private static Map<String, OwnCloudFileObserver> mObserversMap;
  58     private static DownloadCompletedReceiverBis mDownloadReceiver;
  59     private IBinder mBinder = new LocalBinder();
  60
  61     public class LocalBinder extends Binder {
  62         FileObserverService getService() {
  63             return FileObserverService.this;
  64         }
  65     }
  66
  67     @Override
  68     public void onCreate() {
  69         super.onCreate();
  70         mDownloadReceiver = new DownloadCompletedReceiverBis();
  71
  72         IntentFilter filter = new IntentFilter();
  73         filter.addAction(FileDownloader.getDownloadAddedMessage());
  74         filter.addAction(FileDownloader.getDownloadFinishMessage());
  75         registerReceiver(mDownloadReceiver, filter);
  76
  77         mObserversMap = new HashMap<String, OwnCloudFileObserver>();
  78         //initializeObservedList();
  79     }
  80
  81
  82     @Override
  83     public void onDestroy() {
  84         super.onDestroy();
  85         unregisterReceiver(mDownloadReceiver);
  86         mObserversMap = null;   // TODO study carefully the life cycle of Services to grant the best possible observance
  87         Log_OC.d(TAG, "Bye, bye");
  88     }
  89
  90
  91     @Override
  92     public IBinder onBind(Intent intent) {
  93         return mBinder;
  94     }
  95
  96     @Override
  97     public int onStartCommand(Intent intent, int flags, int startId) {
  98         // this occurs when system tries to restart
  99         // service, so we need to reinitialize observers
 100         if (intent == null) {
 101             initializeObservedList();
 102             return Service.START_STICKY;
 103         }
 104
 105         if (!intent.hasExtra(KEY_FILE_CMD)) {
 106             Log_OC.e(TAG, "No KEY_FILE_CMD argument given");
 107             return Service.START_STICKY;
 108         }
 109
 110         switch (intent.getIntExtra(KEY_FILE_CMD, -1)) {
 111             case CMD_INIT_OBSERVED_LIST:
 112                 initializeObservedList();
 113                 break;
 114             case CMD_ADD_OBSERVED_FILE:
 115                 addObservedFile( (OCFile)intent.getParcelableExtra(KEY_CMD_ARG_FILE),
 116                                  (Account)intent.getParcelableExtra(KEY_CMD_ARG_ACCOUNT));
 117                 break;
 118             case CMD_DEL_OBSERVED_FILE:
 119                 removeObservedFile( (OCFile)intent.getParcelableExtra(KEY_CMD_ARG_FILE),
 120                                     (Account)intent.getParcelableExtra(KEY_CMD_ARG_ACCOUNT));
 121                 break;
 122             default:
 123                 Log_OC.wtf(TAG, "Incorrect key given");
 124         }
 125
 126         return Service.START_STICKY;
 127     }
 128
 129
 130     /**
 131      * Read from the local database the list of files that must to be kept synchronized and
 132      * starts file observers to monitor local changes on them
 133      */
 134     private void initializeObservedList() {
 135         mObserversMap.clear();
 136         Cursor c = getContentResolver().query(
 137                 ProviderTableMeta.CONTENT_URI,
 138                 null,
 139                 ProviderTableMeta.FILE_KEEP_IN_SYNC + " = ?",
 140                 new String[] {String.valueOf(1)},
 141                 null);
 142         if (c == null || !c.moveToFirst()) return;
 143         AccountManager acm = AccountManager.get(this);
 144         Account[] accounts = acm.getAccounts();
 145         do {
 146             Account account = null;
 147             for (Account a : accounts)
 148                 if (a.name.equals(c.getString(c.getColumnIndex(ProviderTableMeta.FILE_ACCOUNT_OWNER)))) {
 149                     account = a;
 150                     break;
 151                 }
 152
 153             if (account == null) continue;
 154             FileDataStorageManager storage =
 155                     new FileDataStorageManager(account, getContentResolver());
 156             if (!storage.fileExists(c.getString(c.getColumnIndex(ProviderTableMeta.FILE_PATH))))
 157                 continue;
 158
 159             String path = c.getString(c.getColumnIndex(ProviderTableMeta.FILE_STORAGE_PATH));
 160             if (path == null || path.length() <= 0)
 161                 continue;
 162             OwnCloudFileObserver observer =
 163                     new OwnCloudFileObserver(   path,
 164                                                 account,
 165                                                 getApplicationContext());
 166             mObserversMap.put(path, observer);
 167             if (new File(path).exists()) {
 168                 observer.startWatching();
 169                 Log_OC.d(TAG, "Started watching file " + path);
 170             }
 171
 172         } while (c.moveToNext());
 173         c.close();
 174     }
 175
 176
 177     /**
 178      * Registers the local copy of a remote file to be observed for local changes,
 179      * an automatically updated in the ownCloud server.
 180      *
 181      * This method does NOT perform a {@link SynchronizeFileOperation} over the file.
 182      *
 183      * TODO We are ignoring that, currently, a local file can be linked to different files
 184      * in ownCloud if it's uploaded several times. That's something pending to update: we
 185      * will avoid that the same local file is linked to different remote files.
 186      *
 187      * @param file      Object representing a remote file which local copy must be observed.
 188      * @param account   OwnCloud account containing file.
 189      */
 190     private void addObservedFile(OCFile file, Account account) {
 191         if (file == null) {
 192             Log_OC.e(TAG, "Trying to add a NULL file to observer");
 193             return;
 194         }
 195         String localPath = file.getStoragePath();
 196         if (localPath == null || localPath.length() <= 0) { // file downloading / to be download for the first time
 197             localPath = FileStorageUtils.getDefaultSavePathFor(account.name, file);
 198         }
 199         OwnCloudFileObserver observer = mObserversMap.get(localPath);
 200         if (observer == null) {
 201             /// the local file was never registered to observe before
 202             observer = new OwnCloudFileObserver(    localPath,
 203                                                     account,
 204                                                     getApplicationContext());
 205             mObserversMap.put(localPath, observer);
 206             Log_OC.d(TAG, "Observer added for path " + localPath);
 207
 208             if (file.isDown()) {
 209                 observer.startWatching();
 210                 Log_OC.d(TAG, "Started watching " + localPath);
 211             }   // else - the observance can't be started on a file not already down; mDownloadReceiver will get noticed when the download of the file finishes
 212         }
 213
 214     }
 215
 216
 217     /**
 218      * Unregisters the local copy of a remote file to be observed for local changes.
 219      *
 220      * Starts to watch it, if the file has a local copy to watch.
 221      *
 222      * TODO We are ignoring that, currently, a local file can be linked to different files
 223      * in ownCloud if it's uploaded several times. That's something pending to update: we
 224      * will avoid that the same local file is linked to different remote files.
 225      *
 226      * @param file      Object representing a remote file which local copy must be not observed longer.
 227      * @param account   OwnCloud account containing file.
 228      */
 229     private void removeObservedFile(OCFile file, Account account) {
 230         if (file == null) {
 231             Log_OC.e(TAG, "Trying to remove a NULL file");
 232             return;
 233         }
 234         String localPath = file.getStoragePath();
 235         if (localPath == null || localPath.length() <= 0) {
 236             localPath = FileStorageUtils.getDefaultSavePathFor(account.name, file);
 237         }
 238
 239         OwnCloudFileObserver observer = mObserversMap.get(localPath);
 240         if (observer != null) {
 241             observer.stopWatching();
 242             mObserversMap.remove(observer);
 243             Log_OC.d(TAG, "Stopped watching " + localPath);
 244         }
 245
 246     }
 247
 248
 249     /**
 250      *  Private receiver listening to events broadcast by the FileDownloader service.
 251      *
 252      *  Starts and stops the observance on registered files when they are being download,
 253      *  in order to avoid to start unnecessary synchronizations.
 254      */
 255     private class DownloadCompletedReceiverBis extends BroadcastReceiver {
 256
 257         @Override
 258         public void onReceive(Context context, Intent intent) {
 259             String downloadPath = intent.getStringExtra(FileDownloader.EXTRA_FILE_PATH);
 260             OwnCloudFileObserver observer = mObserversMap.get(downloadPath);
 261             if (observer != null) {
 262                 if (intent.getAction().equals(FileDownloader.getDownloadFinishMessage()) &&
 263                         new File(downloadPath).exists()) {  // the download could be successful. not; in both cases, the file could be down, due to a former download or upload
 264                     observer.startWatching();
 265                     Log_OC.d(TAG, "Watching again " + downloadPath);
 266
 267                 } else if (intent.getAction().equals(FileDownloader.getDownloadAddedMessage())) {
 268                     observer.stopWatching();
 269                     Log_OC.d(TAG, "Disabling observance of " + downloadPath);
 270                 }
 271             }
 272         }
 273
 274     }
 275
 276 }