import datetime
from collections import deque
from functools import wraps
from django.core.cache import cache

def timed_task(f):
    @wraps(f)
    def wrapper(*args, **kwargs):
        """Simple decorator to cache previous 10 execution times

        """
        start = datetime.now()
        rslt = f(*args, **kwargs)
        diff = datetime.now() - start
        cache_key = '%s.timings' % args[0].__class__.__name__
        last_ten = cache.get(cache_key, deque([], 10))
        last_ten.append(diff.seconds + float(diff.microseconds)/1000000)
        if not cache.add(cache_key, last_ten, 86400):
            cache.set(cache_key, last_ten, 86400)
        return rslt
    return wrapper