Deep into the core

sarcachem.py

import memcache, time
 
HOST = "127.0.0.1"
PORT = "11211"
MC_CLIENT = memcache.Client(['%s:%s'%(HOST,PORT)], debug=0)
 
class sarcachem:
 
    class helper:
 
        def __init__(self, outer, fun):
            self.outer = outer
            self.fun = fun
 
        def __call__(self, *args, **kwargs):
            # If cached value does not exist
            # 1. Check to see if it is locked
            #    If it is, wait until it unlocks
            #    If it is not, lock and calculate value,
            #    unlock when finished
            # Return cached value
            key = "%s.%s->(%s,%s)"%(self.outer.salt,
                                   self.fun.func_name,
                                   repr(args),
                                   repr(kwargs))
            key_lock = "00_locked_%s"%(key)
 
            if MC_CLIENT.get(key) is None:
                if not MC_CLIENT.get(key_lock):
                    MC_CLIENT.set(key_lock,True)
                    result = self.fun(*args, **kwargs)
                    MC_CLIENT.set(key,result,time=self.outer.time)
                    print "Storing: ", key, ": ", MC_CLIENT.get(key)
                    MC_CLIENT.delete(key_lock)
                else:
                    while True:
                        time.sleep(1)
                        if not MC_CLIENT.get(key_lock):
                            break
                        else:
                            continue
 
            return MC_CLIENT.get(key)
 
    def __init__(self,time=3,salt="base"):
        """ In this function we set all our decorator's parameters """
        self.time = time
        self.salt = salt
 
    def __call__(self, fun):
        return sarcachem.helper(self, fun)

And here is the way you can use it:

from sarcachem import sarcachem
 
@sarcachem(10,__file__)
def fib(number=0):
 
    # Suck my life into the CPUHOLE
    for i in range(0,100000):
        i+100;
    # END OF LIFE SUCKER
 
    if number==0:
        return 0
    elif number==1:
        return 1
    else:
        return int(fib(number-1)) + int(fib(number-2))
 
if __name__=="__main__":
    print fib(100), fib(29)