Module: Concurrent::Collection

case
when Concurrent.on_jruby?
  require 'concurrent/utility/native_extension_loader'
  # noinspection RubyResolve
  JRubyMapBackend
when Concurrent.on_cruby?
  require 'concurrent/collection/map/mri_map_backend'
  MriMapBackend
when Concurrent.on_truffleruby?
  if defined?(::TruffleRuby::ConcurrentMap)
    require 'concurrent/collection/map/truffleruby_map_backend'
    TruffleRubyMapBackend
  else
    require 'concurrent/collection/map/synchronized_map_backend'
    SynchronizedMapBackend
  end
else
  warn 'Concurrent::Map: unsupported Ruby engine, using a fully synchronized Concurrent::Map implementation'
  require 'concurrent/collection/map/synchronized_map_backend'
  SynchronizedMapBackend
end

case
when Concurrent.on_jruby?
  JavaNonConcurrentPriorityQueue
else
  RubyNonConcurrentPriorityQueue
end