3.3.16.6 Record: DataItem
| Topic Version | 1 | Published | 10/31/2016 | |
| For Standard | ETP v1.1 | |||
A single data point on a channel is the data record used in the Streaming protocol.
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Avro Schema |
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{ "type": "record", "namespace": "Energistics.Datatypes.ChannelData", "name": "DataItem", "fields": [ { "name": "indexes", "type": { "type": "array", "items": "long" } }, { "name": "channelId", "type": "long" }, { "name": "value", "type": "Energistics.Datatypes.DataValue" }, { "name": "valueAttributes", "type": { "type": "array", "items": "Energistics.Datatypes.DataAttribute" } } ] } |
|
Attribute |
Description |
Data Type |
Min |
Max |
|---|---|---|---|---|
|
indexes |
The value of the indexes for this data point. The array MUST be of length 0, or the length of the corresponding index metadata array for the channelId. If the length is 0, then the value is determined from the previous item in the array of DataItem, which MUST have identical index metadata as the channelId of this record. |
long |
0 |
n |
|
channelId |
The identifier of the channel for this point, as received in a ChannelMetadata record. |
long |
1 |
1 |
|
value |
The value of this data point. |
DataValue |
1 |
1 |
|
valueAttributes |
Any qualifiers, such as quality, accuracy, etc., attached to this data point. Array of ID-value pairs, where the IDs and the values are described as part of this specification. Release 1 of ETP does NOT specify any such value metadata. |
DataAttribute |
0 |
n |