TeaVent v0.1.0 TeaVent.Event View Source
The data-representation of the occurrence of an event that is forwarded through the TeaVent stack.
Fields:
topic
: An identification of the ‘logical context’ the event works on.
name
: The kind of event that is happening.
data
: More information that determines what this event is trying to change.
subject
: This field is filled in by the context_provider
(if you have one), based on the topic
, to contain a concrete representation of the logical context the event works on.
changed_subject
: This field is filled in by the result of calling the resolver
function. It is how the subject
will look like after it has been altered by the event.
changes
: This is automatically filled in by TeaVent
once subject
and changed_subject
are filled in (and if and only if both of them are maps or structs) to contain a map of changes between the two. This map contains all keys+values that are different in changed_subject
from subject
.
It is allowed to pattern-match on these fields, but subject
, changed_subject
and changes
will be filled-in automatically by TeaVent. (topic
, name
, data
and meta
are allowed to be accessed/altered directly.)