Example usage of the ASAP library for JRuby

asap_example_1.rb

# ASAP example 1: fetch a list of users and then for each user, fetch their data in parallel
# For simplicity, the format of data returned by our "services" are just CSV strings

data = Asap do
  get "http://url/to/user/list" do |users|
    # this block of code does not execute until the above request is completed
    list = users.split(", ")
    list.each do |user|
      # all of these will execute in parallel
      get "http://url/to/#{user}/data"
    end
  end
end

asap_example_1_output.rb

# Sample output from ASAP example 1
# The data format matches the dependency tree structure

[["user_id_1, user_id_2, user_id3",
  ["user_data_1", "user_data_2", "user_data_3"]]]

asap_example_2.rb

# ASAP example 2: shows more complicated nesting and parallelism

data = Asap do
  get "http://root/" do |root|
    get "#{root}1" do |child|
      get "#{child}1"
      get "#{child}2"
      get "#{child}3"
    end
    get "#{root}2" do |child|
      get "#{child}1"
      get "#{child}2"
      get "#{child}3"
    end
  end
end

asap_example_2_output.rb

# Sample output from ASAP example 2

[["root",
  [["root1",
    ["child1", "child2", "child3"]],
   ["root2",
    ["child1", "child2", "child3"]]]]]

See "Introducing ASAP, an open source parallel assemble JRuby library" for more information.