Package org.yamcs.protobuf

Class ParameterArchiveApiClient

    • Constructor Detail

      • ParameterArchiveApiClient

        public ParameterArchiveApiClient​(MethodHandler handler)

    • Method Detail

      • rebuildRange

        public final void rebuildRange​(Void ctx,
                               RebuildRangeRequest request,
                               Observer<com.google.protobuf.Empty> observer)
          Rebuild range
 
  The back filler has to be enabled for this purpose. The back filling process does not
  remove data but just overwrites it. That means that if the parameter replay returns
  less parameters than originally stored in the archive, the old parameters will still
  be found in the archive.
 
  It also means that if a replay returns the parameter of a different type than
  originally stored, the old ones will still be stored. This is because the parameter
  archive treats parameter with the same name but different type as different parameters.
  Each of them is given an id and the id is stored in the archive.
        Specified by:
        rebuildRange in class AbstractParameterArchiveApi<Void>

      • getParameterSamples

        public final void getParameterSamples​(Void ctx,
                                      Archive.GetParameterSamplesRequest request,
                                      Observer<Pvalue.TimeSeries> observer)
          Get parameter samples
 
  This divides the query interval in a number of intervals and returns aggregated
  statistics (max,min,avg) about each interval.
 
  This operation is useful when making high-level overviews (such as plots) of a
  parameter's value over large time intervals without having to retrieve each
  and every individual parameter value.
 
  By default this operation fetches data from the parameter archive and/or
  parameter cache. If these services are not configured, you can still get
  correct results by specifying the option ``source=replay`` as detailed below.
        Specified by:
        getParameterSamples in class AbstractParameterArchiveApi<Void>

      • getParameterRanges

        public final void getParameterRanges​(Void ctx,
                                     GetParameterRangesRequest request,
                                     Observer<Pvalue.Ranges> observer)
          Get parameter ranges
 
  A range is a tuple ``(start, stop, value, count)`` that represents the time
  interval for which the parameter has been steadily coming in with the same
  value. This request is useful for retrieving an overview for parameters that
  change unfrequently in a large time interval. For example an on/off status
  of a device, or some operational status. Two consecutive ranges containing
  the same value will be returned if there was a gap in the data. The gap is
  determined according to the parameter expiration time configured in the
  Mission Database.
        Specified by:
        getParameterRanges in class AbstractParameterArchiveApi<Void>

      • getArchivedParametersInfo

        public final void getArchivedParametersInfo​(Void ctx,
                                            GetArchivedParametersInfoRequest request,
                                            Observer<ArchivedParametersInfoResponse> observer)
          Get information about the archived parameters.
 
  Each combination of (parameter name, raw type, enginnering type) is assigned a unique parameter id.
  
  The parameters are grouped such that the samples of all parameters from one group have the same timestamp.
  For example all parameters extracted from one TM packet have usually the same timestamp and are part of the same group.
 
  Each group is assigned a unique group id.
 
  A parameter can be part of multiple groups - for instance a parameter appearing in the header of a packet is part of all groups made
  by inherited containers (i.e. each packet with that header will compose another group).
 
  For each group, the parameter archive stores one common record for the timestamps and individual records for the raw and engineering
  values of each parameter. If a parameter appears in multiple groups, retrieving its value means combining (time based merge operation)
  the records beloging to the groups in which the parameter appears.
 
  The response to this method contains the parameter id, name, engineering type, raw type and the groups of which this parameter is part of.
        Specified by:
        getArchivedParametersInfo in class AbstractParameterArchiveApi<Void>