I can answer one or two of those questions.
Faried Nawaz wrote:
How can I tell how long it takes to render pages? I have a SitePage parent class for all my pages (derived from WebKit.Page); should I store the current time in its awake() and print the difference between it and the current time in sleep() to the console?
Unless someone shod me a better way, that's probably what I would do.
I do something very similar to this. I have a class (storage_mod) that handles all of my read and writes to disk. The great thing is that I don't have to worry about how the data is stored (database, files, etc). My servlet pages simply import storage_mod and tell it to get data or save data. All of my data is keyed by a timestamp. I cache accessed data and make sure what I return is the most current piece of information. If there is something more recent than what is in the cache, I stick the new data in the cache. I use the threading module to handle locking the global cache variable (am I doing that correctly?)
Lastly, I'd like to cache some objects in memory.
The only thing I would caution you to keep in mind is that removing a performance hit for accessing data repeatedly can lead to ineffecient code (reading the same data multiple times on one page when it's not necessary). I have had to rewrite some of my code when I find myself doing that.
storage_mod.py is below (my tabs got messed up in the copy/paste. I hope I fixed them all). data_mod is what reads and writes the data.
If it doesn't make sense, just ask.
--John
--file storage_mod.py-- #$Date: 2004/11/30 16:01:21 $
import time import data_mod as data_mod
import threading
cache = {}class storage_mod(object):
def __init__(self,group_date='test_20040615'):
global cache
self.__group_date = group_date self.__l = threading.RLock()
if not cache.has_key(group_date):
self.__l.acquire()
cache[group_date] = {}
self.__l.release() # make data_mod's types available from storage_mod
types = data_mod.data_mod._type_list
for t in types.keys():
self.__dict__[t] = types[t] def saveData(self,type,meta,data):
d = data_mod.data_mod(self.__group_date)
ts = time.strftime("%Y%m%d%H%M%S")
small_part = 0
ts += ('%3d'%small_part).replace(' ','0')
while ts in self.getTimestamps(type,meta):
if small_part < 999:
small_part += 1
else:
break
ts = ts[:-3] + ('%3d'%small_part).replace(' ','0')
d.saveData(type,meta,data,ts)def getData(self,type,meta,allTimeStamps=0):
global cache
d = data_mod.data_mod(self.__group_date)
index = d.getIndex(type,meta)
index.sort()
ret = {}
if not allTimeStamps:
self.__l.acquire()
if cache[self.__group_date].get((type,meta),[None])[0] == index[-1]:
ret = cache[self.__group_date].get((type,meta))[1]
else:
ret = d.getData(type,meta,index[-1])
if not cache[self.__group_date].has_key((type,meta)):
cache[self.__group_date][(type,meta)] = None
cache[self.__group_date][(type,meta)] = (index[-1],ret)
self.__l.release()
else:
data = {}
for x in index:
data[x] = d.getData(type,meta,x)
ret = data
return ret
def getList(self,type):
d = data_mod.data_mod(self.__group_date)
return d.getIndex(type,'') def getTimestamps(self,type,meta):
d = data_mod.data_mod(self.__group_date)
return d.getIndex(type,meta)-------------------------------------------------------
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