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require 'thread'
require 'singleton'
module Mauve
class MauveThread
attr_reader :state, :poll_every
def initialize
@thread = nil
@state = :stopped
end
def logger
@logger ||= Log4r::Logger.new(self.class.to_s)
end
def poll_every=(i)
raise ArgumentError.new("poll_every must be numeric") unless i.is_a?(Numeric)
#
# Set the minimum poll frequency.
#
if i.to_f < 0.2
logger.debug "Increasing thread polling interval to 0.2s from #{i}"
i = 0.2
end
@poll_every = i
end
def run_thread(interval = 1.0)
#
# Good to go.
#
self.state = :starting
@poll_every ||= interval
sleep_loops = (@poll_every.to_f / 0.1).round.to_i
sleep_loops = 1 if sleep_loops.nil? or sleep_loops < 1
while self.state != :stopping do
self.state = :started if self.state == :starting
#
# Schtop!
#
if self.state == :freezing
self.state = :frozen
Thread.stop
self.state = :started
end
yield
#
# Ah-ha! Sleep with a break clause.
#
sleep_loops.times do
break if self.should_stop?
#
# This is a rate-limiting step
#
Kernel.sleep 0.1
end
end
self.state = :stopped
end
def should_stop?
[:freezing, :stopping].include?(self.state)
end
def state=(s)
raise "Bad state for mauve_thread #{s.inspect}" unless [:stopped, :starting, :started, :freezing, :frozen, :stopping, :killing, :killed].include?(s)
unless @state == s
@state = s
logger.debug(s.to_s.capitalize)
end
@state
end
def freeze
self.state = :freezing
20.times { Kernel.sleep 0.2 ; break if @thread.stop? }
logger.warn("Thread has not frozen!") unless @thread.stop?
end
def frozen?
self.stop? and self.state == :frozen
end
def run
if self.alive?
if self.stop?
@thread.wakeup
end
else
@logger = nil
self.state = :starting
@thread = Thread.new{ self.run_thread { self.main_loop } }
end
end
alias start run
alias thaw run
def alive?
@thread.is_a?(Thread) and @thread.alive?
end
def stop?
self.alive? and @thread.stop?
end
def join(ok_exceptions=[])
@thread.join if @thread.is_a?(Thread)
end
# def raise(ex)
# @thread.raise(ex)
# end
def backtrace
@thread.backtrace if @thread.is_a?(Thread)
end
def restart
self.stop
self.start
end
def stop
self.state = :stopping
10.times do
break unless self.alive?
Kernel.sleep 1 if self.alive?
end
#
# OK I've had enough now.
#
self.kill if self.alive?
self.join
end
alias exit stop
def kill
self.state = :killing
@thread.kill
self.state = :killed
end
def thread
@thread
end
end
end
|
