Interface: QueryProcessor

A QueryProcessor runs queries -- this interface is very simple since our only query processor (TupleRouterM) generates and processes queries all by itself (it doesn't currently provide a non-am based interface for receiving queries from neighbors.)

See uses portion of the Network interface in TupleRouterM to understand how queries are submitted to a query processor.

For now, this interface simply allows clients to know when a query has ended and get information about currently running queries.

Author:

Sam Madden (madden@cs.berkeley.edu)

Components providing this interface:

tos.lib.TinyDB.TupleRouter
tos.lib.TinyDB.TupleRouterM

Components requiring this interface:

tos.lib.TinyDB.AggOperator
tos.lib.TinyDB.DBBufferC
tos.lib.TinyDB.NetworkC
tos.lib.TinyDB.Tuple

Commands

• ParsedQueryPtr getQueryCmd (uint8_t qid) Return information about a currently running query

• short msgToQueryRoot (TOS_Msg *msg) Given a processor message return the owner (origninating node) of the query, or -1 if the query is unknown or the message is a query processor message.

• result_t queryComplete(ParsedQueryPtr q) Signalled when a query ends

  Parameters:

  q - The query that ended

getQueryCmd

msgToQueryRoot