/**
* Starts a new transaction on the database. Note, that transaction can also be nested. So in
* order to work properly ALWAYS acquire a {@link DatabaseAdapter} instance via the {@link
* DatabaseAdapter#getInstance(Context)} method.
*
* @return Current {@link DatabaseAdapter} instance.
*/
public DatabaseAdapter beginTransaction() {
open();
mDb.beginTransactionWithListener(TransactionListener.getFor(this));
return this;
}
@Override
public Uri insert(Uri uri, ContentValues values) {
Uri result = null;
boolean applyingBatch = applyingBatch();
if (!applyingBatch) {
mDb = mOpenHelper.getWritableDatabase();
mDb.beginTransactionWithListener(this);
try {
result = insertInTransaction(uri, values);
if (result != null) {
mNotifyChange = true;
}
mDb.setTransactionSuccessful();
} finally {
mDb.endTransaction();
}
onEndTransaction();
} else {
result = insertInTransaction(uri, values);
if (result != null) {
mNotifyChange = true;
}
}
return result;
}
@Override
public int delete(Uri uri, String selection, String[] selectionArgs) {
int count = 0;
boolean applyingBatch = applyingBatch();
if (!applyingBatch) {
mDb = mOpenHelper.getWritableDatabase();
mDb.beginTransactionWithListener(this);
try {
count = deleteInTransaction(uri, selection, selectionArgs);
if (count > 0) {
mNotifyChange = true;
}
mDb.setTransactionSuccessful();
} finally {
mDb.endTransaction();
}
onEndTransaction();
} else {
count = deleteInTransaction(uri, selection, selectionArgs);
if (count > 0) {
mNotifyChange = true;
}
}
return count;
}
@Override
public int bulkInsert(Uri uri, ContentValues[] values) {
int numValues = values.length;
mDb = mOpenHelper.getWritableDatabase();
mDb.beginTransactionWithListener(this);
try {
for (int i = 0; i < numValues; i++) {
Uri result = insertInTransaction(uri, values[i]);
if (result != null) {
mNotifyChange = true;
}
mDb.yieldIfContendedSafely();
}
mDb.setTransactionSuccessful();
} finally {
mDb.endTransaction();
}
onEndTransaction();
return numValues;
}
@Override
public ContentProviderResult[] applyBatch(ArrayList<ContentProviderOperation> operations)
throws OperationApplicationException {
int ypCount = 0;
int opCount = 0;
mDb = mOpenHelper.getWritableDatabase();
mDb.beginTransactionWithListener(this);
try {
mApplyingBatch.set(true);
final int numOperations = operations.size();
final ContentProviderResult[] results = new ContentProviderResult[numOperations];
for (int i = 0; i < numOperations; i++) {
if (++opCount >= MAX_OPERATIONS_PER_YIELD_POINT) {
throw new OperationApplicationException(
"Too many content provider operations between yield points. "
+ "The maximum number of operations per yield point is "
+ MAX_OPERATIONS_PER_YIELD_POINT,
ypCount);
}
final ContentProviderOperation operation = operations.get(i);
if (i > 0 && operation.isYieldAllowed()) {
opCount = 0;
if (mDb.yieldIfContendedSafely(SLEEP_AFTER_YIELD_DELAY)) {
ypCount++;
}
}
results[i] = operation.apply(this, results, i);
}
mDb.setTransactionSuccessful();
return results;
} finally {
mApplyingBatch.set(false);
mDb.endTransaction();
onEndTransaction();
}
}