/** Verify the database exists and is open. */
/* package */ synchronized boolean ensureDatabase() {
if (mDb != null && mDb.isOpen()) {
return true;
}
// Sometimes retrieving the database fails. We do 2 retries: first without database deletion
// and then with deletion.
SQLiteException lastSQLiteException = null;
for (int tries = 0; tries < 2; tries++) {
try {
if (tries > 0) {
deleteDatabase();
}
mDb = getWritableDatabase();
break;
} catch (SQLiteException e) {
lastSQLiteException = e;
}
// Wait before retrying.
try {
Thread.sleep(SLEEP_TIME_MS);
} catch (InterruptedException ie) {
Thread.currentThread().interrupt();
}
}
if (mDb == null) {
throw lastSQLiteException;
}
// This is a sane limit to protect the user from the app storing too much data in the database.
// This also protects the database from filling up the disk cache and becoming malformed
// (endTransaction() calls will throw an exception, not rollback, and leave the db malformed).
mDb.setMaximumSize(DEFAULT_MAX_DB_SIZE);
return true;
}
