Class: AceMQ::AMQP::Patterns::Replay Private

Inherits:
Object
  • Object
show all
Defined in:
lib/acemq/amqp/patterns/replay.rb

Overview

This class is part of a private API. You should avoid using this class if possible, as it may be removed or be changed in the future.

One pass over a queue.

Instance Method Summary collapse

Constructor Details

#initialize(connection, from:, exchange:, routing_key:, limit:, deadline:, restart:, filter:) ⇒ Replay

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns a new instance of Replay.



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# File 'lib/acemq/amqp/patterns/replay.rb', line 134

def initialize(connection, from:, exchange:, routing_key:, limit:, deadline:, restart:,
               filter:)
  # The raw publish, because a replayed message keeps the bytes and the
  # envelope it already had; re-encoding it would be inventing a new
  # message with an old one's identity.
  @transport = connection.respond_to?(:transport) ? connection.transport : connection
  @from = from
  @exchange = exchange
  @routing_key = routing_key
  @limit = limit.to_i
  @deadline = deadline.to_f
  @restart = restart
  @filter = filter
  @result = ReplayResult.new(moved: 0, skipped: 0, reason: :drained)
  # Messages the filter declines are held unacknowledged, not returned
  # one at a time. Returning one immediately does not work: the broker
  # puts it back where it was, at the head of the queue, so the next
  # read hands over the same message and everything behind it is never
  # looked at. Holding them takes them out of the way for the length of
  # the pass, and the broker still has them, so a crash half way through
  # returns them rather than losing them.
  @declined = []
end

Instance Method Details

#run ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/acemq/amqp/patterns/replay.rb', line 158

def run
  ends_at = @deadline.positive? ? monotonic + @deadline : nil
  loop do
    break @result.reason = :deadline if ends_at && monotonic >= ends_at
    break @result.reason = :limit if @limit.positive? && @result.moved >= @limit

    delivery = @transport.pull(@from)
    break @result.reason = :drained if delivery.nil?

    consider(delivery)
  end
  @result
ensure
  release
end