interesting.rb

# -*- encoding : utf-8 -*-
Encoding.default_external = 'utf-8' # why did a Ruby programmer in 2022 feel these to be necessary?

require "multi_json"
require "sinatra"
require "sinatra-contrib", require: "sinatra/multi_route"
require "puma"

require "lock_jar"
LockJar.register_jarfile "Jarfile"
LockJar.lock # haha...
LockJar.load # haaa...

STORE = Java::OrgH2Mvstore::MVstore::Builder.new.file_name("data.db").compress.open
MAP = STORE.open_map "data" # MAP.class => Java::OrgH2Mvstore::MVMap; '"OrgH2Mvstore" "MVMap"' is ungooglable though...
                            # but it seems to be this: https://www.h2database.com/html/mvstore.html

class Server < Sinatra::Base
register Sinatra::MultiRoute

# ...

route :get, :post, "/all" do
  MultiJson.dump entries:MAP.to_a # where does entries come from and how does it interact with :MAP here?
end

# ...