#!/usr/bin/env python3
# -*- coding:-utf-8 -*-

import queue
import threading
import logging

_logger = logging.getLogger('dbus_threadPool')


class Thread(threading.Thread):
    '''
	定义一个能够处理任务的线程类，属于自定义线程类，自定义线程类就需要定义run()函数
	'''

    def __init__(self, taskQueue):
        threading.Thread.__init__(self)
        self.taskQueue = taskQueue
        self.stopFlag = False
        self.setDaemon(True)
        self.start()

    def enableStopFlag(self):
        self.stopFlag = True

    def run(self):
        '''
		重构run 方法
		'''
        while (True):
            if (True == self.stopFlag):
                break

            try:
                _logger.debug("")
                _logger.debug("getting ruleTask from dbusThreadPool queue...")
                func, kwargs = self.taskQueue.get(block=True, timeout=10)
                func(**kwargs)
            except queue.Empty:
                _logger.debug("dbusThreadPool Queue is empty and have no ruleTask in the queue")
            except:
                _logger.exception("dbusThreadPool: task exec err#####")


class ThreadPool(object):
    '''
	自定义线程池
	'''

    def __init__(self, threadNum, taskNum):
        self.threadList = []
        self.taskQueue = queue.Queue(maxsize=taskNum)
        self._init_threadPool(threadNum)

    def _init_threadPool(self, threadNum):
        for i in range(threadNum):
            thread = Thread(self.taskQueue)
            self.threadList.append(thread)

    def addTask(self, func, **kwargs):

        try:
            self.taskQueue.put((func, kwargs), block=False)
        except queue.Full:
            _logger.warning("dbusThreaPool Queue is overflowed")
            pass

    def releasThread(self):
        """
		关闭线程池中所有的线程
		"""
        for item in self.threadList:
            if (item.isAlive()):
                item.enableStopFlag()
                item.join()


# 函数名称： createThread
# 功能描述： 创建独立线程
# 输入参数：
# 	task： 任务
# 	args: 任务的参数
# 返 回 值： 无
def createThread(task, args=()):
    t = threading.Thread(target=task, args=args)
    t.setDaemon(True)
    t.start()