Interface: AggregateUse

Author: Eugene Shvets Intention is to make addition of user-defined aggregates easy. Dispatch is based on aggregate id (AggregateID enum is Aggregates.h), which is the first argument for every command in this interface. No in-memory data structures is created to keep aggregate info, therefore we need to pass ParamList argument to each command

Author:

Eugene Shvets

Components providing this interface:

tos.lib.TinyDB.Aggregates.AggregateUseM

Components requiring this interface:

tos.lib.TinyDB.AggOperator

Commands

• result_t merge (uint8_t id, char *destdata, char *mergedata, ParamList *params, ParamVals *paramValues) dest, merge - raw data.

• result_t update(uint8_t id, char *dest, char *value, ParamList *params, ParamVals *paramValues)
• result_t init(uint8_t id, char *data, ParamList *params, ParamVals *paramValues, bool isFirstTime) Called in the beginning of each epoch

  Parameters:

  isFirstTime - true if this is the very first call for this aggregate

• uint16_t stateSize(uint8_t id, ParamList *params, ParamVals *paramValues)
• bool hasData(uint8_t id, char *data, ParamList *params, ParamVals *paramValues)
• TinyDBError finalize(uint8_t id, char *data, char *result_buf, ParamList *params, ParamVals *paramValues)
• AggregateProperties getProperties(uint8_t id)

merge