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         if (!intent.hasExtra(KEY_FILE_CMD)) {
  52             Log.e(TAG, "No KEY_FILE_CMD argument given");
  53             return Service.START_STICKY;
  54         }
  55
  56         switch (intent.getIntExtra(KEY_FILE_CMD, -1)) {
  57             case CMD_INIT_OBSERVED_LIST:
  58                 initializeObservedList();
  59                 break;
  60             case CMD_ADD_OBSERVED_FILE:
  61                 addObservedFile(intent.getStringExtra(KEY_CMD_ARG));
  62                 break;
  63             case CMD_DEL_OBSERVED_FILE:
  64                 removeObservedFile(intent.getStringExtra(KEY_CMD_ARG));
  65                 break;
  66             default:
  67                 Log.wtf(TAG, "Incorrect key given");
  68         }
  69
  70         return Service.START_STICKY;
  71     }
  72
  73     private void initializeObservedList() {
  74         if (mObservers != null) return; // nothing to do here
  75         mObservers = new ArrayList<OwnCloudFileObserver>();
  76         mDownloadReceivers = new ArrayList<DownloadCompletedReceiver>();
  77         Cursor c = getContentResolver().query(
  78                 ProviderTableMeta.CONTENT_URI,
  79                 null,
  80                 ProviderTableMeta.FILE_KEEP_IN_SYNC + " = ?",
  81                 new String[] {String.valueOf(1)},
  82                 null);
  83         if (!c.moveToFirst()) return;
  84         AccountManager acm = AccountManager.get(this);
  85         Account[] accounts = acm.getAccounts();
  86         do {
  87             Account account = null;
  88             for (Account a : accounts)
  89                 if (a.name.equals(c.getString(c.getColumnIndex(ProviderTableMeta.FILE_ACCOUNT_OWNER)))) {
  90                     account = a;
  91                     break;
  92                 }
  93
  94             if (account == null) continue;
  95             FileDataStorageManager storage =
  96                     new FileDataStorageManager(account, getContentResolver());
  97             if (!storage.fileExists(c.getString(c.getColumnIndex(ProviderTableMeta.FILE_PATH))))
  98                 continue;
  99
 100             String path = c.getString(c.getColumnIndex(ProviderTableMeta.FILE_STORAGE_PATH));
 101             OwnCloudFileObserver observer =
 102                     new OwnCloudFileObserver(path, OwnCloudFileObserver.CHANGES_ONLY);
 103             observer.setContext(getBaseContext());
 104             observer.setAccount(account);
 105             observer.setStorageManager(storage);
 106             observer.setOCFile(storage.getFileByPath(c.getString(c.getColumnIndex(ProviderTableMeta.FILE_PATH))));
 107             observer.startWatching();
 108             mObservers.add(observer);
 109             Log.d(TAG, "Started watching file " + path);
 110
 111         } while (c.moveToNext());
 112         c.close();
 113     }
 114
 115     private void addObservedFile(String path) {
 116         if (path == null) return;
 117         if (mObservers == null) {
 118             // this is very rare case when service was killed by system
 119             // and observers list was deleted in that procedure
 120             initializeObservedList();
 121         }
 122         boolean duplicate = false;
 123         OwnCloudFileObserver observer = null;
 124         for (int i = 0; i < mObservers.size(); ++i) {
 125             observer = mObservers.get(i);
 126             if (observer.getPath().equals(path))
 127                 duplicate = true;
 128             observer.setContext(getBaseContext());
 129         }
 130         if (duplicate) return;
 131         observer = new OwnCloudFileObserver(path, OwnCloudFileObserver.CHANGES_ONLY);
 132         observer.setContext(getBaseContext());
 133         Account account = AccountUtils.getCurrentOwnCloudAccount(getBaseContext());
 134         observer.setAccount(account);
 135         FileDataStorageManager storage =
 136                 new FileDataStorageManager(account, getContentResolver());
 137         observer.setStorageManager(storage);
 138         observer.setOCFile(storage.getFileByLocalPath(path));
 139
 140         DownloadCompletedReceiver receiver = new DownloadCompletedReceiver(path, observer);
 141         registerReceiver(receiver, new IntentFilter(FileDownloader.DOWNLOAD_FINISH_MESSAGE));
 142
 143         mObservers.add(observer);
 144         Log.d(TAG, "Observer added for path " + path);
 145     }
 146
 147     private void removeObservedFile(String path) {
 148         if (path == null) return;
 149         if (mObservers == null) {
 150             initializeObservedList();
 151             return;
 152         }
 153         for (int i = 0; i < mObservers.size(); ++i) {
 154             OwnCloudFileObserver observer = mObservers.get(i);
 155             if (observer.getPath().equals(path)) {
 156                 observer.stopWatching();
 157                 mObservers.remove(i);
 158                 break;
 159             }
 160         }
 161         Log.d(TAG, "Stopped watching " + path);
 162     }
 163
 164     private static void addReceiverToList(DownloadCompletedReceiver r) {
 165         synchronized(mReceiverListLock) {
 166             mDownloadReceivers.add(r);
 167         }
 168     }
 169
 170     private static void removeReceiverFromList(DownloadCompletedReceiver r) {
 171         synchronized(mReceiverListLock) {
 172             mDownloadReceivers.remove(r);
 173         }
 174     }
 175
 176     private class DownloadCompletedReceiver extends BroadcastReceiver {
 177         String mPath;
 178         OwnCloudFileObserver mObserver;
 179
 180         public DownloadCompletedReceiver(String path, OwnCloudFileObserver observer) {
 181             mPath = path;
 182             mObserver = observer;
 183             addReceiverToList(this);
 184         }
 185
 186         @Override
 187         public void onReceive(Context context, Intent intent) {
 188             if (mPath.equals(intent.getStringExtra(FileDownloader.EXTRA_FILE_PATH))) {
 189                 context.unregisterReceiver(this);
 190                 removeReceiverFromList(this);
 191                 mObserver.startWatching();
 192                 Log.d(TAG, "Started watching " + mPath);
 193                 return;
 194             }
 195         }
 196
 197         @Override
 198         public boolean equals(Object o) {
 199             if (o instanceof DownloadCompletedReceiver)
 200                 return mPath.equals(((DownloadCompletedReceiver)o).mPath);
 201             return super.equals(o);
 202         }
 203     }
 204 }