from threading import Thread, Condition
from queue import Queue


class WriterConsumerEx(Thread):
    def __init__(self, handler):
        Thread.__init__(self)
        self._cond = Condition()
        self._messages = Queue()
        self._stopped = False
        self._handler = handler

    def run(self):
        while True:
            with self._cond:
                while self._messages.empty():
                    self._cond.wait()
                while self._messages.empty() is False:
                    method, params = self._messages.get()
                    self._handler.write(method, params)
                    self._messages.task_done()
                if self._stopped == True:
                    break

    def put(self, method,params):
        with self._cond:
            self._messages.put((method, params))
            self._cond.notify()

    def quit(self):
        with self._cond:
            self._stopped = True
            self._cond.notify()