private void ProcessAttention(TdsParserStateObject stateObj)
{
if (_state == TdsParserState.Closed || _state == TdsParserState.Broken)
{
return;
}
Debug.Assert(stateObj._attentionSent, "invalid attempt to ProcessAttention, attentionSent == false!");
// Attention processing scenarios:
// 1) EOM packet with header ST_AACK bit plus DONE with status DONE_ATTN
// 2) Packet without ST_AACK header bit but has DONE with status DONE_ATTN
// 3) Secondary timeout occurs while reading, break connection
// Since errors can occur and we need to cancel prior to throwing those errors, we
// cache away error state and then process TDS for the attention. We restore those
// errors after processing.
stateObj.StoreErrorAndWarningForAttention();
try
{
// Call run loop to process looking for attention ack.
Run(RunBehavior.Attention, null, null, null, stateObj);
}
catch (Exception e)
{
if (!ADP.IsCatchableExceptionType(e))
{
throw;
}
// If an exception occurs - break the connection.
// Attention error will not be thrown in this case by Run(), but other failures may.
_state = TdsParserState.Broken;
_connHandler.BreakConnection();
throw;
}
stateObj.RestoreErrorAndWarningAfterAttention();
Debug.Assert(!stateObj._attentionSent, "Invalid attentionSent state at end of ProcessAttention");
}