Package com.pushtechnology.diffusion.client.topics.details

Enum Class TopicType

java.lang.Object

java.lang.Enum<TopicType>

com.pushtechnology.diffusion.client.topics.details.TopicType

All Implemented Interfaces:

Serializable, Comparable<TopicType>, Constable

public enum TopicType
extends Enum<TopicType>

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

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.	String.
INT64	Single scalar value.	64-bit integer.
DOUBLE	Single scalar value.	Double precision floating point number.
BINARY	Single scalar value.	Arbitrary binary data.
RECORD_V2	Single composite value.	RecordV2 – Diffusion-specific data type. A list of records, each composed of field values, with an optional schema.
JSON	Single composite value.	JSON, backed by CBOR-format binary.
TIME_SERIES	Append-only log of events.	TimeSeries.Event containing a value of a well-known data type.

Since:

5.0

Author:

DiffusionData Limited

See Also:

• TopicSpecification

Nested Class Summary

Nested classes/interfaces inherited from class java.lang.Enum

Enum.EnumDesc<E extends Enum<E>>

Enum Constant Summary

Enum Constants

Enum Constant	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_TOPIC_TYPE	A topic type that is unsupported by the session.

Method Summary

Modifier and Type	Method	Description
static TopicType	valueOf(String name)	Returns the enum constant of this class with the specified name.
static TopicType[]	values()	Returns an array containing the constants of this enum class, in the order they are declared.

Methods inherited from class java.lang.Enum

clone, compareTo, describeConstable, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Details

JSON

public static final TopicType JSON

Topic that stores and publishes JSON (JavaScript Object Notation) values. Based on the JSON data type.

Supports delta-streams.

Since:

5.7

BINARY

public static final TopicType BINARY

Topic that stores and publishes binary values. Based on the binary data type.

Supports delta-streams.

Since:

5.7

RECORD_V2

public static final TopicType RECORD_V2

Topic that stores and publishes data in the form of records and fields. Based on the RecordV2 data type.

Supports delta-streams.

Since:

6.0

DOUBLE

public static final TopicType DOUBLE

Topic that stores and publishes IEEE 754 double-precision floating point numbers. Based on the double data type.

Supports null Double values.

The topic does not support delta-streams — only complete values are transmitted.

Since:

6.0

INT64

public static final TopicType INT64

Topic that stores and publishes 64-bit integer values. Based on the int64 data type.

Supports null Long values.

The topic does not support delta-streams — only complete values are transmitted.

Since:

6.0

STRING

public static final TopicType STRING

Topic that stores and publishes String values. Based on the string data type.

Supports null String values.

Supports delta-streams.

Since:

6.0

TIME_SERIES

public static final TopicType TIME_SERIES

Time Series Topic.

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 event data type, such as Binary, String, or JSON, that determines the type of value associated with each event.

Retained range

The TIME_SERIES_SUBSCRIPTION_RANGE 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.

Subscription range

The TIME_SERIES_SUBSCRIPTION_RANGE 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 range query.

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 time series feature documentation.

Mandatory properties

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

Since:

6.0

See Also:

• TimeSeries

UNKNOWN_TOPIC_TYPE

public static final TopicType UNKNOWN_TOPIC_TYPE

A topic type that is unsupported by the session.

Since:

6.1

Method Details

values

public static TopicType[] values()

Returns an array containing the constants of this enum class, in the order they are declared.

Returns:

an array containing the constants of this enum class, in the order they are declared

valueOf

public static TopicType valueOf(String name)

Returns the enum constant of this class with the specified name. The string must match exactly an identifier used to declare an enum constant in this class. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

IllegalArgumentException - if this enum class has no constant with the specified name

NullPointerException - if the argument is null