Source code for iro.model.pool

# Copyright (c) 2012 netzguerilla.net <iro@netzguerilla.net>
# 
# This file is part of Iro.
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# this software and associated documentation files (the "Software"), to deal in
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# 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:
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# INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
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from decorator import decorator
import sqlalchemy
class Data:
    """A very simple class to save the thread pool for database requests"""
    def __init__(self):
        self.pool =  None

data = Data()
"""holds connection to the actual thread pool for the database requests"""

def setPool(pool): 
    """setting the thread pool"""
    data.pool = pool

@decorator
def runInDBPool(f,*args,**kwargs):
    """Decorator to run DB queries in Twisted's thread pool.
    
    If last argument is a session object, the function is called directly.
    """
    if isinstance(args[-1],sqlalchemy.orm.session.Session):
        return f(*args,**kwargs)
    else:
        return data.pool.run(f, *args, **kwargs)