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.MainApp;
  26 import com.owncloud.android.datamodel.FileDataStorageManager;
  27 import com.owncloud.android.datamodel.OCFile;
  28 import com.owncloud.android.db.ProviderMeta.ProviderTableMeta;
  29 import com.owncloud.android.files.OwnCloudFileObserver;
  30 import com.owncloud.android.operations.SynchronizeFileOperation;
  31 import com.owncloud.android.utils.FileStorageUtils;
  32 import com.owncloud.android.utils.Log_OC;
  33
  34
  35 import android.accounts.Account;
  36 import android.accounts.AccountManager;
  37 import android.app.Service;
  38 import android.content.BroadcastReceiver;
  39 import android.content.Context;
  40 import android.content.Intent;
  41 import android.content.IntentFilter;
  42 import android.database.Cursor;
  43 import android.os.Binder;
  44 import android.os.IBinder;
  45
  46 public class FileObserverService extends Service {
  47
  48     public final static int CMD_INIT_OBSERVED_LIST = 1;
  49     public final static int CMD_ADD_OBSERVED_FILE = 2;
  50     public final static int CMD_DEL_OBSERVED_FILE = 3;
  51
  52     public final static String KEY_FILE_CMD = "KEY_FILE_CMD";
  53     public final static String KEY_CMD_ARG_FILE = "KEY_CMD_ARG_FILE";
  54     public final static String KEY_CMD_ARG_ACCOUNT = "KEY_CMD_ARG_ACCOUNT";
  55
  56     private static String TAG = FileObserverService.class.getSimpleName();
  57
  58     private static Map<String, OwnCloudFileObserver> mObserversMap;
  59     private static DownloadCompletedReceiverBis mDownloadReceiver;
  60     private IBinder mBinder = new LocalBinder();
  61
  62     public class LocalBinder extends Binder {
  63         FileObserverService getService() {
  64             return FileObserverService.this;
  65         }
  66     }
  67
  68     @Override
  69     public void onCreate() {
  70         super.onCreate();
  71         mDownloadReceiver = new DownloadCompletedReceiverBis();
  72
  73         IntentFilter filter = new IntentFilter();
  74         filter.addAction(FileDownloader.getDownloadAddedMessage());
  75         filter.addAction(FileDownloader.getDownloadFinishMessage());
  76         registerReceiver(mDownloadReceiver, filter);
  77
  78         mObserversMap = new HashMap<String, OwnCloudFileObserver>();
  79         //initializeObservedList();
  80     }
  81
  82
  83     @Override
  84     public void onDestroy() {
  85         super.onDestroy();
  86         unregisterReceiver(mDownloadReceiver);
  87         mObserversMap = null;   // TODO study carefully the life cycle of Services to grant the best possible observance
  88         Log_OC.d(TAG, "Bye, bye");
  89     }
  90
  91
  92     @Override
  93     public IBinder onBind(Intent intent) {
  94         return mBinder;
  95     }
  96
  97     @Override
  98     public int onStartCommand(Intent intent, int flags, int startId) {
  99         // this occurs when system tries to restart
 100         // service, so we need to reinitialize observers
 101         if (intent == null) {
 102             initializeObservedList();
 103             return Service.START_STICKY;
 104         }
 105
 106         if (!intent.hasExtra(KEY_FILE_CMD)) {
 107             Log_OC.e(TAG, "No KEY_FILE_CMD argument given");
 108             return Service.START_STICKY;
 109         }
 110
 111         switch (intent.getIntExtra(KEY_FILE_CMD, -1)) {
 112             case CMD_INIT_OBSERVED_LIST:
 113                 initializeObservedList();
 114                 break;
 115             case CMD_ADD_OBSERVED_FILE:
 116                 addObservedFile( (OCFile)intent.getParcelableExtra(KEY_CMD_ARG_FILE),
 117                                  (Account)intent.getParcelableExtra(KEY_CMD_ARG_ACCOUNT));
 118                 break;
 119             case CMD_DEL_OBSERVED_FILE:
 120                 removeObservedFile( (OCFile)intent.getParcelableExtra(KEY_CMD_ARG_FILE),
 121                                     (Account)intent.getParcelableExtra(KEY_CMD_ARG_ACCOUNT));
 122                 break;
 123             default:
 124                 Log_OC.wtf(TAG, "Incorrect key given");
 125         }
 126
 127         return Service.START_STICKY;
 128     }
 129
 130
 131     /**
 132      * Read from the local database the list of files that must to be kept synchronized and
 133      * starts file observers to monitor local changes on them
 134      */
 135     private void initializeObservedList() {
 136         mObserversMap.clear();
 137         Cursor c = getContentResolver().query(
 138                 ProviderTableMeta.CONTENT_URI,
 139                 null,
 140                 ProviderTableMeta.FILE_KEEP_IN_SYNC + " = ?",
 141                 new String[] {String.valueOf(1)},
 142                 null);
 143         if (c == null || !c.moveToFirst()) return;
 144         AccountManager acm = AccountManager.get(this);
 145         Account[] accounts = acm.getAccountsByType(MainApp.getAccountType());
 146         do {
 147             Account account = null;
 148             for (Account a : accounts)
 149                 if (a.name.equals(c.getString(c.getColumnIndex(ProviderTableMeta.FILE_ACCOUNT_OWNER)))) {
 150                     account = a;
 151                     break;
 152                 }
 153
 154             if (account == null) continue;
 155             FileDataStorageManager storage =
 156                     new FileDataStorageManager(account, getContentResolver());
 157             if (!storage.fileExists(c.getString(c.getColumnIndex(ProviderTableMeta.FILE_PATH))))
 158                 continue;
 159
 160             String path = c.getString(c.getColumnIndex(ProviderTableMeta.FILE_STORAGE_PATH));
 161             if (path == null || path.length() <= 0)
 162                 continue;
 163             OwnCloudFileObserver observer =
 164                     new OwnCloudFileObserver(   path,
 165                                                 account,
 166                                                 getApplicationContext());
 167             mObserversMap.put(path, observer);
 168             if (new File(path).exists()) {
 169                 observer.startWatching();
 170                 Log_OC.d(TAG, "Started watching file " + path);
 171             }
 172
 173         } while (c.moveToNext());
 174         c.close();
 175     }
 176
 177
 178     /**
 179      * Registers the local copy of a remote file to be observed for local changes,
 180      * an automatically updated in the ownCloud server.
 181      *
 182      * This method does NOT perform a {@link SynchronizeFileOperation} over the file.
 183      *
 184      * TODO We are ignoring that, currently, a local file can be linked to different files
 185      * in ownCloud if it's uploaded several times. That's something pending to update: we
 186      * will avoid that the same local file is linked to different remote files.
 187      *
 188      * @param file      Object representing a remote file which local copy must be observed.
 189      * @param account   OwnCloud account containing file.
 190      */
 191     private void addObservedFile(OCFile file, Account account) {
 192         if (file == null) {
 193             Log_OC.e(TAG, "Trying to add a NULL file to observer");
 194             return;
 195         }
 196         String localPath = file.getStoragePath();
 197         if (localPath == null || localPath.length() <= 0) { // file downloading / to be download for the first time
 198             localPath = FileStorageUtils.getDefaultSavePathFor(account.name, file);
 199         }
 200         OwnCloudFileObserver observer = mObserversMap.get(localPath);
 201         if (observer == null) {
 202             /// the local file was never registered to observe before
 203             observer = new OwnCloudFileObserver(    localPath,
 204                                                     account,
 205                                                     getApplicationContext());
 206             mObserversMap.put(localPath, observer);
 207             Log_OC.d(TAG, "Observer added for path " + localPath);
 208
 209             if (file.isDown()) {
 210                 observer.startWatching();
 211                 Log_OC.d(TAG, "Started watching " + localPath);
 212             }   // else - the observance can't be started on a file not already down; mDownloadReceiver will get noticed when the download of the file finishes
 213         }
 214
 215     }
 216
 217
 218     /**
 219      * Unregisters the local copy of a remote file to be observed for local changes.
 220      *
 221      * Starts to watch it, if the file has a local copy to watch.
 222      *
 223      * TODO We are ignoring that, currently, a local file can be linked to different files
 224      * in ownCloud if it's uploaded several times. That's something pending to update: we
 225      * will avoid that the same local file is linked to different remote files.
 226      *
 227      * @param file      Object representing a remote file which local copy must be not observed longer.
 228      * @param account   OwnCloud account containing file.
 229      */
 230     private void removeObservedFile(OCFile file, Account account) {
 231         if (file == null) {
 232             Log_OC.e(TAG, "Trying to remove a NULL file");
 233             return;
 234         }
 235         String localPath = file.getStoragePath();
 236         if (localPath == null || localPath.length() <= 0) {
 237             localPath = FileStorageUtils.getDefaultSavePathFor(account.name, file);
 238         }
 239
 240         OwnCloudFileObserver observer = mObserversMap.get(localPath);
 241         if (observer != null) {
 242             observer.stopWatching();
 243             mObserversMap.remove(observer);
 244             Log_OC.d(TAG, "Stopped watching " + localPath);
 245         }
 246
 247     }
 248
 249
 250     /**
 251      *  Private receiver listening to events broadcast by the FileDownloader service.
 252      *
 253      *  Starts and stops the observance on registered files when they are being download,
 254      *  in order to avoid to start unnecessary synchronizations.
 255      */
 256     private class DownloadCompletedReceiverBis extends BroadcastReceiver {
 257
 258         @Override
 259         public void onReceive(Context context, Intent intent) {
 260             String downloadPath = intent.getStringExtra(FileDownloader.EXTRA_FILE_PATH);
 261             OwnCloudFileObserver observer = mObserversMap.get(downloadPath);
 262             if (observer != null) {
 263                 if (intent.getAction().equals(FileDownloader.getDownloadFinishMessage()) &&
 264                         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
 265                     observer.startWatching();
 266                     Log_OC.d(TAG, "Watching again " + downloadPath);
 267
 268                 } else if (intent.getAction().equals(FileDownloader.getDownloadAddedMessage())) {
 269                     observer.stopWatching();
 270                     Log_OC.d(TAG, "Disabling observance of " + downloadPath);
 271                 }
 272             }
 273         }
 274
 275     }
 276
 277 }