xml_promises.rb

require "nokogiri"
require "concurrent"

################################
# Methods
################################

def parse_data_into_chuncks(data)
  chunks = {}
  ccda.css("chunk section").each do |chunk|
    chunk_name = component.at_css("foo[bar='Chunk']")["chunkName"]
    chunks[chunk_name] = chunk
  end
  chunks
end

def scrape_chunk_a(xml) do
  #implement parsing
end

def scrape_chunk_b(xml) do
  #implement parsing
end

def scrape_chunk_b(xml) do
  #implement parsing
end

################################
# Important bits
################################

xml_data = Nokogiri::XML.parse(data_payload) { |config| config.noblanks }
xml_data.remove_namespaces! #note this bang method strips namespaces in place, so its faster, but unsafe
parsed_chunks = parse_data_into_chunck(xml_data)

promise_a = Concurrent::Promise.new do
  scrape_chunk_a(parsed_chunks["The Name of Chunk A from `parse_data_into_chuncks`"])
end

promise_b = Concurrent::Promise.new do
  scrape_chunk_b(parsed_chunks["The Name of Chunk B from `parse_data_into_chuncks`"])
end

promise_c = Concurrent::Promise.new do
  scrape_chunk_c(parsed_chunks["The Name of Chunk C from `parse_data_into_chuncks`"])
end

promises_hash = {
  a: promise_a,
  b: promise_b,
  c: promise_c
}

promises = promises_hash.values
all_promises = = Concurrent::Promise.all?(*promises).then do
    {
      a: a.value(1)[:some_thing],
      b: b.value(1)[:some_other_thing],
      c: d.value(1)[:the_last_thing]
    }
end

all_promises.execute
final_data = all_promises.value(3) #or however long you need to wait