To determine the completion of an asynchronous call, the caller can query the non-blocking isReady() function of the returned object. Most of the other functions of the object potentially block until the object becomes ready. The ready status signals completion of the asynchronous call. Note that the change of state of the returned object from notReady to ready occurs if and only if the caller tries to access the future object. This is because the asynchronous support provided by the DB Interface Module is based on the polling paradigm. To determine asynchronous call completion, the DB Interface Module polls the underlying database vendor's API using the application thread; it doesn't spawn its own thread.

If the returned object is not in ready state, accessing the object will potentially block except for the following two functions:

bool RWDBResult::isReady()

This call will not block. Since this function checks the underlying API for asynchronous call completions, accessing this function can speed up the completion of an asynchronous call.

RWDBStatus RWDBResult::status()