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# -*- coding: utf-8 -*-
require 'securerandom'
require 'set'
class Pluggaloid::StreamGenerator < Pluggaloid::Handler
attr_reader :accepted_hash
def initialize(event, *specs, plugin:, **kwrest, &callback)
raise Pluggaloid::UndefinedStreamIndexError, 'To call generate(%{event}), it must define prototype arguments include `Pluggaloid::STREAM\'.' % {event: event.name} unless event.stream_index
super(event, **kwrest)
@callback = callback
@specs = specs.freeze
@accepted_hash = @event.argument_hash(specs, nil)
@last_subscribe_state = @event.subscribe?(*@specs)
@plugin = plugin
subscribe_start if @last_subscribe_state
@event.register_stream_generator(self)
end
def on_subscribed
if !@last_subscribe_state
@last_subscribe_state = true
subscribe_start
end
end
def on_unsubscribed
subscribe_state = @event.subscribe_hash?(@accepted_hash)
if @last_subscribe_state && !subscribe_state
@last_subscribe_state = false
subscribe_stop
end
end
# このリスナを削除する
# ==== Return
# self
def detach
@event.delete_stream_generator(self)
@yielder&.die
@yielder = nil
self
end
private
def subscribe_start
@tag = @plugin.handler_tag do
@yielder = Yielder.new(@event, args: @specs)
@callback.call(@yielder)
end
end
def subscribe_stop
@plugin.detach(@tag)
@yielder.die
@yielder = nil
end
class Yielder
def initialize(event, args:)
@event = event
@args = args.freeze
@alive = true
end
def bulk_add(lst)
raise Pluggaloid::NoReceiverError, "All event listener of #{self.class} already detached." if die?
args = @args.dup
args.insert(@event.stream_index, lst)
@event.call(*args)
end
def add(value)
bulk_add([value])
end
alias_method :<<, :add
def die?
!@alive
end
def die
@alive = false
freeze
end
end
end
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