Caching with beaker

问题

I have a program that scrapes a website for data. I want to be able to cache that data instead of loading it if its only been a few minutes since it was last retrieved. I looked at beaker but I'm extremely new to cache and not sure if this is what i need. I also do not really understand what the Cachemanager is and why i only use "cache.get" instead of using both "cache.set" and "cache.get". I have included the script that i have been using to test with.

from beaker.cache import CacheManager
from beaker.util import parse_cache_config_options
import sched, time
from datetime import datetime

cache_opts = {
             'cache.type': 'file',
             'cache.data_dir': '../Beaker/tmp/cache/data',
             'cache.lock_dir': '../Beaker/tmp/cache/lock'
             }

cache = CacheManager(**parse_cache_config_options(cache_opts))
tmpl_cache = cache.get_cache('mytemplate', type='file', expire=5)

def get_results():
    # do something to retrieve data
    print 'hey'
    data = datetime.now()
    return data

def get_results2():
    return 'askdjfla;j'

s = sched.scheduler(time.time, time.sleep)
def get_time(sc):     
    results = tmpl_cache.get(key='gophers', createfunc=get_results)    
    results2 = tmpl_cache.get(key='hank', createfunc=get_results2)   
    print results,results2
    sc.enter(1, 1, get_time, (sc,))

s.enter(1, 1, get_time, (s,))
s.run()

Am i going about this the right way?

回答1:

You are using only cache.get, and that is correct, because if it isn't found in the cache, it will call the function to create it. This becomes clearer and easier if you instead use the decorator API:

@cache.cache('gophers', expire=3600)
def get_results():
    # do something to retrieve data
    print 'hey'
    data = datetime.now()
    return data

@cache.cache('hank', expire=3600)
def get_results2():
    return 'askdjfla;j'

s = sched.scheduler(time.time, time.sleep)
def get_time(sc):     
    results = get_results()
    results2 = get_results2()
    print results,results2
    sc.enter(1, 1, get_time, (sc,))

来源：https://stackoverflow.com/questions/16292082/caching-with-beaker