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require 'concurrent/atomics'
require 'concurrent/executor/executor_service'
module Concurrent
# An executor service in which every operation spawns a new,
# independently operating thread.
#
# This is perhaps the most inefficient executor service in this
# library. It exists mainly for testing an debugging. Thread creation
# and management is expensive in Ruby and this executor performs no
# resource pooling. This can be very beneficial during testing and
# debugging because it decouples the using code from the underlying
# executor implementation. In production this executor will likely
# lead to suboptimal performance.
#
# @note Intended for use primarily in testing and debugging.
class SimpleExecutorService < RubyExecutorService
# @!macro executor_service_method_post
def self.post(*args)
raise ArgumentError.new('no block given') unless block_given?
Thread.new(*args) do
Thread.current.abort_on_exception = false
yield(*args)
end
true
end
# @!macro executor_service_method_left_shift
def self.<<(task)
post(&task)
self
end
# @!macro executor_service_method_post
def post(*args, &task)
raise ArgumentError.new('no block given') unless block_given?
return false unless running?
@count.increment
Thread.new(*args) do
Thread.current.abort_on_exception = false
begin
yield(*args)
ensure
@count.decrement
@stopped.set if @running.false? && @count.value == 0
end
end
end
# @!macro executor_service_method_left_shift
def <<(task)
post(&task)
self
end
# @!macro executor_service_method_running_question
def running?
@running.true?
end
# @!macro executor_service_method_shuttingdown_question
def shuttingdown?
@running.false? && ! @stopped.set?
end
# @!macro executor_service_method_shutdown_question
def shutdown?
@stopped.set?
end
# @!macro executor_service_method_shutdown
def shutdown
@running.make_false
@stopped.set if @count.value == 0
true
end
# @!macro executor_service_method_kill
def kill
@running.make_false
@stopped.set
true
end
# @!macro executor_service_method_wait_for_termination
def wait_for_termination(timeout = nil)
@stopped.wait(timeout)
end
private
def ns_initialize(*args)
@running = Concurrent::AtomicBoolean.new(true)
@stopped = Concurrent::Event.new
@count = Concurrent::AtomicFixnum.new(0)
end
end
end
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