basic skeleton for executing tasks in parallel in jruby

load-test.rb

require 'java'

java_import 'java.util.concurrent.ThreadPoolExecutor'
java_import 'java.util.concurrent.TimeUnit'
java_import 'java.util.concurrent.LinkedBlockingQueue'
java_import 'java.util.concurrent.FutureTask'
java_import 'java.util.concurrent.Callable'
java_import 'java.util.concurrent.Executors'

### SETTINGS
concurrency = 80
times = concurrency * 100
### END SETTINGS

executor = Executors.newFixedThreadPool(concurrency)

class ThreadTest
  include Callable

  def call
    sleep 5
    print "."
  end
end

puts "starting"
tasks = []
times.times { tasks << ThreadTest.new }
executor.invokeAll(tasks)
puts "ending"

executor.shutdown
executor.awaitTermination(2, TimeUnit::MINUTES)