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require 'concurrent/executor/immediate_executor'
require 'concurrent/executor/simple_executor_service'
module Concurrent
# An executor service which runs all operations on a new thread, blocking
# until it completes. Operations are performed in the order they are received
# and no two operations can be performed simultaneously.
#
# This executor service exists mainly for testing an debugging. When used it
# immediately runs every `#post` operation on a new thread, blocking the
# current thread until the operation is complete. This is similar to how the
# ImmediateExecutor works, but the operation has the full stack of the new
# thread at its disposal. This can be helpful when the operations will spawn
# more operations on the same executor and so on - such a situation might
# overflow the single stack in case of an ImmediateExecutor, which is
# inconsistent with how it would behave for a threaded executor.
#
# @note Intended for use primarily in testing and debugging.
class IndirectImmediateExecutor < ImmediateExecutor
# Creates a new executor
def initialize
super
@internal_executor = SimpleExecutorService.new
end
# @!macro executor_service_method_post
def post(*args, &task)
raise ArgumentError.new("no block given") unless block_given?
return false unless running?
event = Concurrent::Event.new
@internal_executor.post do
begin
task.call(*args)
ensure
event.set
end
end
event.wait
true
end
end
end
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