redis实战 -- python知识散记

#!/usr/bin/env python

import time

def schedule_row_cache(conn,row_id, delay) : 
    conn.zadd(‘delay:‘, row_id, delay)
    conn.zadd(‘schedule:‘, row_id, time.time())


def cache_rows(conn) : 
    while not QUIT : 
        next = conn.zrange(‘schedule:‘, 0, 0, withscores=True)
        now = time.time()
        if not next or next[0][1] > now :
            time.sleep(.05)
            continue
        row_id = next[0][0]
        
        delay = conn.zscore(‘delay:‘, row_id)
        if delay <= 0 : 
            conn.zdel(‘delay:‘, row_id)
            conn.zdel(‘schedule:‘, row_id)
            conn.delete(‘inv:‘ + row_id)
        row = Inventory.get(row_id)
        conn.zadd(‘schedule:‘, row_id, now + delay)
        conn.set(‘inv:‘ + row_id, json.dumps(row.to_dict()))