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

   1 package com.owncloud.android.files.services;
   2
   3 import java.util.ArrayList;
   4 import java.util.List;
   5
   6 import com.owncloud.android.AccountUtils;
   7 import com.owncloud.android.datamodel.FileDataStorageManager;
   8 import com.owncloud.android.db.ProviderMeta.ProviderTableMeta;
   9 import com.owncloud.android.files.OwnCloudFileObserver;
  10
  11 import android.accounts.Account;
  12 import android.accounts.AccountManager;
  13 import android.app.Service;
  14 import android.content.BroadcastReceiver;
  15 import android.content.Context;
  16 import android.content.Intent;
  17 import android.content.IntentFilter;
  18 import android.database.Cursor;
  19 import android.os.Binder;
  20 import android.os.IBinder;
  21 import android.util.Log;
  22
  23 public class FileObserverService extends Service {
  24
  25     public final static String KEY_FILE_CMD = "KEY_FILE_CMD";
  26     public final static String KEY_CMD_ARG = "KEY_CMD_ARG";
  27
  28     public final static int CMD_INIT_OBSERVED_LIST = 1;
  29     public final static int CMD_ADD_OBSERVED_FILE = 2;
  30     public final static int CMD_DEL_OBSERVED_FILE = 3;
  31
  32     private static String TAG = "FileObserverService";
  33     private static List<OwnCloudFileObserver> mObservers;
  34     private static List<DownloadCompletedReceiver> mDownloadReceivers;
  35     private static Object mReceiverListLock = new Object();
  36     private IBinder mBinder = new LocalBinder();
  37
  38     public class LocalBinder extends Binder {
  39         FileObserverService getService() {
  40             return FileObserverService.this;
  41         }
  42     }
  43
  44     @Override
  45     public IBinder onBind(Intent intent) {
  46         return mBinder;
  47     }
  48
  49     @Override
  50     public int onStartCommand(Intent intent, int flags, int startId) {
  51         // this occurs when system tries to restart
  52         // service, so we need to reinitialize observers
  53         if (intent == null) {
  54             initializeObservedList();
  55             return Service.START_STICKY;
  56         }
  57
  58         if (!intent.hasExtra(KEY_FILE_CMD)) {
  59             Log.e(TAG, "No KEY_FILE_CMD argument given");
  60             return Service.START_STICKY;
  61         }
  62
  63         switch (intent.getIntExtra(KEY_FILE_CMD, -1)) {
  64             case CMD_INIT_OBSERVED_LIST:
  65                 initializeObservedList();
  66                 break;
  67             case CMD_ADD_OBSERVED_FILE:
  68                 addObservedFile(intent.getStringExtra(KEY_CMD_ARG));
  69                 break;
  70             case CMD_DEL_OBSERVED_FILE:
  71                 removeObservedFile(intent.getStringExtra(KEY_CMD_ARG));
  72                 break;
  73             default:
  74                 Log.wtf(TAG, "Incorrect key given");
  75         }
  76
  77         return Service.START_STICKY;
  78     }
  79
  80     private void initializeObservedList() {
  81         if (mObservers != null) return; // nothing to do here
  82         mObservers = new ArrayList<OwnCloudFileObserver>();
  83         mDownloadReceivers = new ArrayList<DownloadCompletedReceiver>();
  84         Cursor c = getContentResolver().query(
  85                 ProviderTableMeta.CONTENT_URI,
  86                 null,
  87                 ProviderTableMeta.FILE_KEEP_IN_SYNC + " = ?",
  88                 new String[] {String.valueOf(1)},
  89                 null);
  90         if (!c.moveToFirst()) return;
  91         AccountManager acm = AccountManager.get(this);
  92         Account[] accounts = acm.getAccounts();
  93         do {
  94             Account account = null;
  95             for (Account a : accounts)
  96                 if (a.name.equals(c.getString(c.getColumnIndex(ProviderTableMeta.FILE_ACCOUNT_OWNER)))) {
  97                     account = a;
  98                     break;
  99                 }
 100
 101             if (account == null) continue;
 102             FileDataStorageManager storage =
 103                     new FileDataStorageManager(account, getContentResolver());
 104             if (!storage.fileExists(c.getString(c.getColumnIndex(ProviderTableMeta.FILE_PATH))))
 105                 continue;
 106
 107             String path = c.getString(c.getColumnIndex(ProviderTableMeta.FILE_STORAGE_PATH));
 108             OwnCloudFileObserver observer =
 109                     new OwnCloudFileObserver(path, OwnCloudFileObserver.CHANGES_ONLY);
 110             observer.setContext(getBaseContext());
 111             observer.setAccount(account);
 112             observer.setStorageManager(storage);
 113             observer.setOCFile(storage.getFileByPath(c.getString(c.getColumnIndex(ProviderTableMeta.FILE_PATH))));
 114             observer.startWatching();
 115             mObservers.add(observer);
 116             Log.d(TAG, "Started watching file " + path);
 117
 118         } while (c.moveToNext());
 119         c.close();
 120     }
 121
 122     private void addObservedFile(String path) {
 123         if (path == null) return;
 124         if (mObservers == null) {
 125             // this is very rare case when service was killed by system
 126             // and observers list was deleted in that procedure
 127             initializeObservedList();
 128         }
 129         boolean duplicate = false;
 130         OwnCloudFileObserver observer = null;
 131         for (int i = 0; i < mObservers.size(); ++i) {
 132             observer = mObservers.get(i);
 133             if (observer.getPath().equals(path))
 134                 duplicate = true;
 135             observer.setContext(getBaseContext());
 136         }
 137         if (duplicate) return;
 138         observer = new OwnCloudFileObserver(path, OwnCloudFileObserver.CHANGES_ONLY);
 139         observer.setContext(getBaseContext());
 140         Account account = AccountUtils.getCurrentOwnCloudAccount(getBaseContext());
 141         observer.setAccount(account);
 142         FileDataStorageManager storage =
 143                 new FileDataStorageManager(account, getContentResolver());
 144         observer.setStorageManager(storage);
 145         observer.setOCFile(storage.getFileByLocalPath(path));
 146
 147         DownloadCompletedReceiver receiver = new DownloadCompletedReceiver(path, observer);
 148         registerReceiver(receiver, new IntentFilter(FileDownloader.DOWNLOAD_FINISH_MESSAGE));
 149
 150         mObservers.add(observer);
 151         Log.d(TAG, "Observer added for path " + path);
 152     }
 153
 154     private void removeObservedFile(String path) {
 155         if (path == null) return;
 156         if (mObservers == null) {
 157             initializeObservedList();
 158             return;
 159         }
 160         for (int i = 0; i < mObservers.size(); ++i) {
 161             OwnCloudFileObserver observer = mObservers.get(i);
 162             if (observer.getPath().equals(path)) {
 163                 observer.stopWatching();
 164                 mObservers.remove(i);
 165                 break;
 166             }
 167         }
 168         Log.d(TAG, "Stopped watching " + path);
 169     }
 170
 171     private static void addReceiverToList(DownloadCompletedReceiver r) {
 172         synchronized(mReceiverListLock) {
 173             mDownloadReceivers.add(r);
 174         }
 175     }
 176
 177     private static void removeReceiverFromList(DownloadCompletedReceiver r) {
 178         synchronized(mReceiverListLock) {
 179             mDownloadReceivers.remove(r);
 180         }
 181     }
 182
 183     private class DownloadCompletedReceiver extends BroadcastReceiver {
 184         String mPath;
 185         OwnCloudFileObserver mObserver;
 186
 187         public DownloadCompletedReceiver(String path, OwnCloudFileObserver observer) {
 188             mPath = path;
 189             mObserver = observer;
 190             addReceiverToList(this);
 191         }
 192
 193         @Override
 194         public void onReceive(Context context, Intent intent) {
 195             if (mPath.equals(intent.getStringExtra(FileDownloader.EXTRA_FILE_PATH))) {
 196                 context.unregisterReceiver(this);
 197                 removeReceiverFromList(this);
 198                 mObserver.startWatching();
 199                 Log.d(TAG, "Started watching " + mPath);
 200                 return;
 201             }
 202         }
 203
 204         @Override
 205         public boolean equals(Object o) {
 206             if (o instanceof DownloadCompletedReceiver)
 207                 return mPath.equals(((DownloadCompletedReceiver)o).mPath);
 208             return super.equals(o);
 209         }
 210     }
 211 }