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# frozen_string_literal: true
require_dependency "renalware/letters"
require "pdf/reader"
module Renalware
module Letters
# This class is both a Wisper listener (subscribing to ApproveLetter events) and an ActiveJob.
# Should be configured in the broadcast_subscription_map to listen to events from ApproveLetter
# and be invoked aysnchronously via a background queue ie delayed_job.
#
# We generate a PDF version of the letter (or retrieve it from the cache) and inspect it
# using a PDF tool to get the page count. We then save that away to the letters table.
#
# The page count is useful when printing letters; letters with the same page count can be
# printed together and fed into an envelope stuffer with the same page count setting eg 2
# (address cover sheet + duplex printed letter). Most of the time page count will be 1,
# but the page count setting on the printer will be 2 because of the additional address cover
# sheet.
class CalculatePageCountJob < ApplicationJob
pattr_initialize :letter
# This method is the name of an event raised elsewhere by a Wisper publisher.
# It needs to be a class method in order to be invoked asynchronously by delayed_job
def self.letter_approved(letter)
new(letter).call
end
def call
letter.update_column(:page_count, pdf_reader.page_count)
rescue StandardError => e
# In Wisper async jobs, rescue_from blocks defined on the ApplicationJob class
# do not seem to be called, so we need to invoke them ourselves with this call to a fn on
# ActiveSupport::Rescuable which is already mixed into ActiveJob::Base.
rescue_with_handler(e) || raise
end
private
def pdf_reader
PDF::Reader.new(pdf_data)
end
def pdf_data
letter_presenter = LetterPresenter.new(letter)
StringIO.new(PdfRenderer.call(letter_presenter))
end
end
end
end
Version data entries
10 entries across 10 versions & 1 rubygems