Event¶

Purpose¶

An event sent to a topic.

Type¶

Reception:

EventV1

Record with fields:

topic: TopicIdentity

Topic the event is published to

publisher: EngineIdentity

PubSub engine identity of pulisher

seq: u32

Sequence number of publisher

deps: Vec

Events this event depends on

seen: Vec

Independent events recently seen

body: Vec

Encapsulated EngineMessage

sig: Signature

Signature by publisher over the above fields

Triggers:

Event

EngineMessage

Behaviour¶

The Event is forwarded in the network along topic dissemination paths. It contains an encapsulated EngineMessage addressed from an engine to the topic.

The PubSub engine delivers the encapsulated EngineMessage to local engines by sending it to the Router, which forwards it to local engines subscribed to the topic.

Message flow¶

sequenceDiagram

%% --8<-- [start:sequence]
Router -) PubSub: EngineMessage
PubSub -) PubSub: Event
PubSub -) Router: EngineMessage
Router -) Any Local Engine: EngineMessage
%% --8<-- [end:sequence]