#!/usr/bin/env python
from threading import Timer
import sys
import time
import copy
import os
from subprocess import call

class EventLoopDelaySpawn(object):
    """An Event Loop Class That Spawns a Method in a Delayed Thread"""

    def __init__(self, poll=10,
                        wait=1,
                        verbose=True,
                        dir1="/tmp/dir1",
                        dir2="/tmp/dir3"):

        self.poll = int(poll)
        self.wait = int(wait)
        self.verbose = verbose
        self.dir1 = dir1
        self.dir2 = dir2

    def poller(self):
        """Creates Poll Interval"""
        time.sleep(self.poll)
        if self.verbose:
            print "Polling at %s sec interval" % self.poll

    def action(self):
        if self.verbose:
            print "waiting %s seconds to run Action" % self.wait
        ret = call("rsync -av --delete %s/ %s" % (self.dir1, self.dir2), shell=True)

    def eventHandler(self):
        #if two directories contain same file names
        if os.listdir(self.dir1) != os.listdir(self.dir2):
            print os.listdir(self.dir1)
            t = Timer(self.wait, self.action)
            t.start()
            if self.verbose:
                print "Event Registered"
        else:
            if self.verbose:
                print "No Event Registered"

    def run(self):
        """Runs an event loop with a delayed action"""
        try:
            while True:
                self.eventHandler()
                self.poller()

        except Exception, err:
            print "Error: %s " % err

        finally:
            sys.exit(0)

E = EventLoopDelaySpawn()
E.run()