# Copyright (c) 2012 netzguerilla.net <iro@netzguerilla.net>

# 

# This file is part of Iro.

# 

# Permission is hereby granted, free of charge, to any person obtaining a copy of

# this software and associated documentation files (the "Software"), to deal in

# the Software without restriction, including without limitation the rights to use,

# copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the

# #Software, and to permit persons to whom the Software is furnished to do so,

# subject to the following conditions:

# 

# The above copyright notice and this permission notice shall be included in

# all copies or substantial portions of the Software.

# 

# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,

# INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A

# PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT

# HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION

# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE

# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

from twisted.python.threadpool import ThreadPool

from twisted.internet import threads

class Pool:

    """wrapper class to handles a twisted threadpool"""

    def __init__(self,name,maxthreads):

        """

        :param string name: name of the threadpool

        :param integer maxthreads: how many thread a allowed at maximum

        """

        self.maxthreads = maxthreads

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

        self.reactor = None

    def start(self, reactor):

        """stats the pool and adds the pool.stop function to the stop procedure.

        :param reactor: a valid twisted reactor

        """

        self.pool.start()

        self.reactor = reactor

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

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

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

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

taskPool = Pool('task',5)

"""taskpool to handle sending data"""

dbPool = Pool('database',5)

"""pool to handle database connection via sqlalchemy""" 

pools=[taskPool,dbPool]

"""all available pools"""

def startPool(reactor):

    '''run start function for all items in :attr:`pools`'''

    for pool in pools:

        pool.start(reactor)

__all__=["Pool", "startPool", "dbPool", "taskPool", "pools"]