Page History

...

{ 
    "signal"  :  "vehicle.body.cabin.temperature"
    "count"   : "132"  # Might be redundant information, optional.
    "values" : {
        { 
            "ts" : "2020-01-10T02:59:43.491751"
            "value" : "42.5"
        },
        { 
            "ts" : "2020-01-10T02:59:43.491751"
            "value" : "43.0"
        },
        ... 130 more records
    }
}

AVRO-schema example (not complete, and of course the "#comments" are not allowed to be there)

# First attempt at AVRO schema for TimeSeries

{
  "type": "record",
  "name": "TimeSeries",
  "fields" : [
# This is the AVRO meaning of record (i.e. kind {"name": "signal", "type": "string"}, 
    {of struct), not the Record type in our type hierarchy.
  "name": "countTimeSeries",  "type": "int" },
    {"name": "values", "type": "array"  "items" : 
        { "name" : "ts # We are defining the TimeSeries value format
  "fields" : [
    {"name": "signal", "type" : "string"},   # ISOFull formattedpath timestampVSS with }dot-notation,
 like in example above
    { "name" : "valuecount", "type": "unionint" {}, TODO: union of int/long/string/  # VSS types }
    }
} as above
    {"name": "values", "type": "array",
         "items" : {
            "type" : "record",              # ***
            "name" : "TimeStampedRecord",
            "fields" : [ 
              { "name" : "ts", "type" : "string"   # ISO formatted timestamp, maybe use int later for efficiency  },
              # "value" can be any VSS data type, so here we must define a "union" of types.  Also arrays are possible in that union.
              { "name" : "value", "type" : [ "int", "long", "float", "double", "string", "boolean", 
                 { "type" : "array", "items" :  
                    # This gets a bit complex because the array primitive type could also be any type (i.e. another union, except we don't do arrays in arrays)
                    [ "int", "long", "float", "double", "string", "boolean"
                    ] # End of union definition for the items in an array
                 } # End of the VSS Array type definition
               ] # End of union definition for the field "value" in the TimeStampedRecord
            ] # End of list of fields
         } # End of "items"
    } # end of "values"
  ] # end of "fields"
} # end of TimeSeries record

*** Note that we should define the TimeStampedRecord schema separately, and refer to it instead of having it inline like this...

Snapshot:

{ 
    "timeperiod" { 
        "start" : "2020-01-10T02:00:00Z",
        "end" : "2020-01-11T01:59:59Z"
    },
    "values" : {
     {
        "signal" : "vehicle.body.cabin.temperature",
        "value" : "22.0",
        "ts" : "2020-01-10T02:59:43.491751"
     },
     {
        "signal" : "vehicle.drivetrain.engine.rpm.average",
        "value" : "3200",
        "ts" : "2020-01-10T02:59:44.100403"
     }
}

...