Example - Object Pool in Python

python, pool, пул, шаблоны проектирования

Example of the design pattern An object pool in the Python programming language.

"""
Offer a significant performance boost; it is most effective in
situations where the cost of initializing a class instance is high, the
rate of instantiation of a class is high, and the number of
instantiations in use at any one time is low.
"""
 
 
class ReusablePool:
    """
    Manage Reusable objects for use by Client objects.
    """
 
    def __init__(self, size):
        self._reusables = [Reusable() for _ in range(size)]
 
    def acquire(self):
        return self._reusables.pop()
 
    def release(self, reusable):
        self._reusables.append(reusable)
 
 
class Reusable:
    """
    Collaborate with other objects for a limited amount of time, then
    they are no longer needed for that collaboration.
    """
 
    pass
 
 
def main():
    reusable_pool = ReusablePool(10)
    reusable = reusable_pool.acquire()
    reusable_pool.release(reusable)
 
 
if __name__ == "__main__":
    main()