from twisted.python.threadpool import ThreadPool

from twisted.internet import threads

class Pool:

    def __init__(self,name,maxthreads):

        self.maxthreads = maxthreads

        self.pool =  ThreadPool(minthreads=1, maxthreads=maxthreads, name=name)

        self.reactor = None

    def start(self, reactor):

        self.pool.start()

        self.reactor = reactor

        self.reactor.addSystemEventTrigger('before', 'shutdown', self.pool.stop)

    def run(self,f,*args,**kwargs):

        """To run a function in Twisted's thread pool"""

        return threads.deferToThreadPool(self.reactor, self.pool, f, *args, **kwargs)

taskPool = Pool('task',5)

dbPool = Pool('database',5)

pools=[taskPool,dbPool]

def startPool(reactor):

    '''starting all pools'''

    for pool in pools:

        pool.start(reactor)