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#!/usr/local/bin/ruby
require 'drb'
require 'thread'
def message(s)
$stderr.puts "tracker: #{s}" if ENV && ENV["DEBUG_GATEWAY"]
end
class Tracker
include DRbUndumped
def initialize(instances, socket_path)
@instances = instances
@socket = File.expand_path(socket_path)
@active = false
@listeners = []
@instances.times { @listeners << Mutex.new }
message "using #{@listeners.length} listeners"
message "opening socket at #{@socket}"
@service = DRb.start_service("drbunix://#{@socket}", self)
end
def with_listener
message "listener requested"
mutex = has_lock = index = nil
3.times do
@listeners.each_with_index do |mutex, index|
has_lock = mutex.try_lock
break if has_lock
end
break if has_lock
sleep 0.05
end
if has_lock
message "obtained listener #{index}"
@active = true
begin yield index
ensure
mutex.unlock
message "released listener #{index}"
end
else
message "dropping request because no listeners are available!"
end
end
def background(check_interval = nil)
if check_interval
loop do
sleep check_interval
message "Idle for #{check_interval}, shutting down" unless @active
@active = false
Kernel.exit 0
end
else DRb.thread.join
end
end
end
socket_path = ARGV.shift
instances = ARGV.shift.to_i
t = Tracker.new(instances, socket_path)
t.background(ARGV.first ? ARGV.shift.to_i : 90)
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