queryprocessor.nc

nesC写的heed算法

// $Id: QueryProcessor.nc,v 1.3.8.3 2003/08/18 22:09:47 cssharp Exp $

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 */
includes TinyDB;

/** 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.)
    <p>
    See uses portion of the Network interface in  TupleRouterM to understand
    how queries are submitted to a query processor.
    <p>
    For now, this interface simply allows clients to know when a query has ended
    and get information about currently running queries.
    @author Sam Madden ([e-mail])
*/
    
    
interface QueryProcessor {
  /** Signalled when a query ends
      @param q The query that ended
  */
  event result_t queryComplete(ParsedQueryPtr q);

  /** Return information about a currently running query
      @param qid The query for which information is sought
      @return A pointer to the query data structure, or NULL if no such query exists.
  */
  command ParsedQueryPtr getQueryCmd(uint8_t qid);

  /** 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.

      @param msg The query for which the root is sought
  */
  command short msgToQueryRoot(TOS_Msg *msg);

  command short numQueries();
  command ParsedQueryPtr getQueryIdx(short i);

  command bool queryProcessorWantsData(QueryResult *qr);

}