Interface: Aggregate

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

Author:

Eugene Shvets

Components providing this interface:

tos.lib.TinyDB.Aggregates.AvgM
tos.lib.TinyDB.Aggregates.CountM
tos.lib.TinyDB.Aggregates.ExpAvgM
tos.lib.TinyDB.Aggregates.MaxM
tos.lib.TinyDB.Aggregates.MinM
tos.lib.TinyDB.Aggregates.SumM
tos.lib.TinyDB.Aggregates.WinAvgM
tos.lib.TinyDB.Aggregates.WinCountM
tos.lib.TinyDB.Aggregates.WinMaxM
tos.lib.TinyDB.Aggregates.WinMinM
tos.lib.TinyDB.Aggregates.WinSumM

Components requiring this interface:

tos.lib.TinyDB.Aggregates.AggregateUseM

Commands

• result_t merge(char *destdata, char *mergedata, ParamList *params, ParamVals *paramValues) Updates local partial state with another partial state

• result_t update(char *dest, char *value, ParamList *params, ParamVals *paramValues) Updates local state with a sensor reading

• result_t init(char *data, ParamList *params, ParamVals *paramValues, bool isFirstTime) Initializer Called in the beginning of each epoch

  Parameters:

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

• TinyDBError finalize(char *data, char *result_buf, ParamList *params, ParamVals *paramValues) Finalizer

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

• bool hasData(char *data, ParamList *params, ParamVals *paramValues) Called each epoch, returns true if aggregate has data to send out

• AggregateProperties getProperties(void) Returns aggregate properties, such as monotonic, etc