StreamTuple get()

Acquires a single tuple registered in the SDP server.

If there are no tuples in the output stream queue, null is returned.

If a stop notification has been issued to the query group when this method is called (a data transmission termination notification has been sent by a method, or a query group stop notification has been sent by a command), one of the following processes takes place:

• For the first method call after the stop notification
  null is returned.
  
• For the second or subsequent method call after the stop notification
  An exception is thrown.
  

This method is a polling method.

None.

The following table shows the exceptions and the conditions for their generation.

Exception	Generation condition
SDPClientCommunicationException	A communication exception occurred during RMI connection.
SDPClientEndOfStreamException	Processing of the transmitted data is finished.
SDPClientException	The output stream is already closed. A listener object for callback is already registered.
SDPClientQueryGroupHoldException	The query group is held.
SDPClientQueryGroupNotExistException	The query group was deleted.
SDPClientQueryGroupStateException	The query group is not being executed.
SDPClientQueryGroupStopException	There is no result data or the query group is stopped.

Acquired tuple (StreamTuple type object)