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# frozen_string_literal: true
# An Event object represents a domain event that occurred in a bounded context.
# By publishing events we notify other bounded contexts about something
# that happened, so that they can react to it.
#
# Define new event classes under `app/events/<namespace>/` with a name
# representing something that happened in the past:
#
# class Projects::ProjectCreatedEvent < Gitlab::EventStore::Event
# def schema
# {
# 'type' => 'object',
# 'properties' => {
# 'project_id' => { 'type' => 'integer' }
# }
# }
# end
# end
#
# To publish it:
#
# Gitlab::EventStore.publish(
# Projects::ProjectCreatedEvent.new(data: { project_id: project.id })
# )
#
module Gitlab
module EventStore
class Event
attr_reader :data
def initialize(data:)
validate_schema!(data)
@data = data
end
def schema
raise NotImplementedError, 'must specify schema to validate the event'
end
private
def validate_schema!(data)
unless data.is_a?(Hash)
raise Gitlab::EventStore::InvalidEvent, "Event data must be a Hash"
end
unless JSONSchemer.schema(schema).valid?(data.deep_stringify_keys)
raise Gitlab::EventStore::InvalidEvent, "Data for event #{self.class} does not match the defined schema: #{schema}"
end
end
end
end
end
|
