class Reacto::Operations::FlatMapLatest

Public Class Methods

new(transform) click to toggle source
# File lib/reacto/operations/flat_map_latest.rb, line 6
def initialize(transform)
  @transform = transform
  @last_active = nil
end

Public Instance Methods

call(tracker) click to toggle source
# File lib/reacto/operations/flat_map_latest.rb, line 11
def call(tracker)
  subscription = Subscriptions::FlatMapSubscription.new(tracker)
  value = lambda do |v|
    trackable = @transform.call(v)

    @last_active.unsubscribe if @last_active

    sub = subscription.subscription!
    trackable.do_track sub
    @last_active = sub
  end

  close = lambda do
    subscription.source_closed = true
    return unless subscription.closed?

    tracker.on_close
  end

  Subscriptions::OperationSubscription.new(
    tracker, value: value, close: close
  )
end