Enum TopicType

The topic type determines the type of the data values a topic publishes to subscribers.

Namespace: PushTechnology.ClientInterface.Client.Topics

Assembly: Diffusion.Client.dll

Syntax

public enum TopicType : byte

Remarks

Source Topics

Most topics are source topics. The characteristics of each type of source topic are summarized in the following table:

Topic Type	State	Data Type
STRING	Single scalar value	`System.String`. Supports delta-streams and `null` values.
INT64	Single scalar value	`System.Int64`. Supports `null` values.
DOUBLE	Single scalar value	`System.Double`. Supports `null` values.
BINARY	Single scalar value	Arbitrary binary data. Supports delta-streams.
RECORD_V2	Single composite value	IRecordV2. Supports delta-streams.
JSON	Single composite value	IJSON. Supports delta-streams.
TIME_SERIES	Append-only log of events	IEvent<TValue>.

Time Series Topics

A time series is a sequence of events. Each event contains a value and has server-assigned metadata comprised of a sequence number, timestamp, and author.

A time series topic allows sessions to access a time series that is maintained by the server. A time series topic has an associated IDataType, such as Binary, String, or JSON, that determines the type of value associated with each event.

The TimeSeriesRetainedRange property configures the range of historic events retained by a time series topic. If the property is not specified, a time series topic will retain the ten most recent events.

The TimeSeriesSubscriptionRange property configures a time series topic to send a range of historic events from the end of the time series to new subscribers. This is a convenient way to synchronize new subscribers without requiring the use of a IRangeQuery<TValue>.

By default, new subscribers will be sent the latest event if delta streams are enabled and no events if delta streams are disabled. See the description of Subscription range in the ITimeSeries documentation.

The TimeSeriesEventValueType property must be provided when creating a time series topic.

Fields

Name	Description
BINARY	Topic that stores and publishes binary values.
DOUBLE	Topic that stores and publishes IEEE 754 double-precision floating point numbers.
INT64	Topic that stores and publishes 64-bit integer values.
JSON	Topic that stores and publishes JSON (JavaScript Object Notation) values.
RECORD_V2	Topic that stores and publishes data in the form of records and fields.
STRING	Topic that stores and publishes String values.
TIME_SERIES	Time Series Topic.
UNKNOWN	A topic type that is unsupported by the session.