final TransactionFutureCallback newTxFutureCallback = new TransactionFutureCallback(this, shardName);
txFutureCallback = newTxFutureCallback;
txFutureCallbackMap.put(shardName, txFutureCallback);
final TransactionFutureCallback newTxFutureCallback = new TransactionFutureCallback(this, shardName);
txFutureCallback = newTxFutureCallback;
txFutureCallbackMap.put(shardName, txFutureCallback);