TopicUnsubRequest¶

Purpose¶

Unsubscription request for a pub/sub topic.

Type¶

Reception:

TopicUnsubRequestV1

Record with fields:

topic: TopicIdentity

Pub/sub topic identity

scope: RoutingScope

Whether the unsubscription request is local-only or should be also sent to the network

Triggers:

TopicUnsubResponseV1

Result

Structure¶

Field	Type	Description
`topic`	TopicIdentity	Topic ID to unsubscribe
`scope`	RoutingScope	Whether the unsubscription request should be sent to the network

Behaviour¶

If the topic does not exist yet in the RoutingTable, the EngineIdentity of the requesting engine is added to the RoutingTable, and a TopicSubResponse is returned with a success result.

Otherwise, if the topic does not exist yet:

when the scope is LocalOnly, an error is returned
when the scope is Any, the Router sends a SubscribeRequest to PubSub

Message flow¶

sequenceDiagram

%% --8<-- [start:sequence]
Any Local Engine ->>+ Router: TopicUnsubRequest
Router ->>+ PubSub: UnsubscribeRequest
PubSub -->>- Router: UnsubscribeResponse
Router -->>- Any Local Engine: TopicUnsubResponse
%% --8<-- [end:sequence]