aggregate.nc

nesC写的heed算法

// $Id: Aggregate.nc,v 1.4.4.3 2003/08/26 09:08:14 cssharp Exp $

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/**
 * Author: Eugene Shvets
 *
 * This interface allows users to create custom aggregates. All built-in
 * aggregates conform to this interface.
 * @author Eugene Shvets
 */

interface Aggregate {

  /**
   * Updates local partial state with another partial state
   */
  command result_t merge(char *destdata, char *mergedata, ParamList *params, ParamVals *paramValues);
  
  /**
   * Updates local state with a sensor reading
   */
  command result_t update(char *dest, char* value, ParamList *params, ParamVals *paramValues);

  /**
   * Initializer
   * Called in the beginning of each epoch
   * @param isFirstTime true if this is the very first call for this aggregate
   */
  command result_t init(char *data, ParamList *params, ParamVals *paramValues, bool isFirstTime);
  
  /**
   * Finalizer
   */
  command TinyDBError finalize(char *data, char *result_buf, ParamList *params, ParamVals *paramValues);

  /**
   * Returns the size of aggregate's state, in bytes
   */
  command uint16_t stateSize(ParamList *params, ParamVals *paramValues);

  /**
   * Called each epoch, returns true if aggregate has data to send out
   */
  command bool hasData(char *data, ParamList *params, ParamVals *paramValues);
  
  /**
   * Returns aggregate properties, such as monotonic, etc
   */
   
   command AggregateProperties getProperties();
}