python使用連接池操作redis數據庫

環境準備

準備好ubntu18.04虛擬機，並且安裝redis，pyton等環境。
環境準備

概念

本示例採用單例模式，創建redis連接池。這樣可以在應用程序的任何地方使用相同的連接池，節省系統開銷

程序示例

'''
使用單例模式創建redis 鏈接池
'''
from redis import ConnectionPool
import threading
import time
class redis_pool(object):
    _instance_lock = threading.Lock()
    pool = ConnectionPool(host='localhost', port=6379, db=0)
    def __init__(self):
        time.sleep(1)

    @classmethod
    def instance(cls, *args, **kwargs):
        if not hasattr(redis_pool, "_instance"):
            with redis_pool._instance_lock:
                if not hasattr(redis_pool, "_instance"):
                    redis_pool._instance = redis_pool(*args, **kwargs)
        return redis_pool._instance

if __name__ == "__main__":
    def task(arg):
        obj = redis_pool.instance()
        print(obj)
        print(obj.pool)
    for i in range(10):
        t = threading.Thread(target=task,args=[i,])
        t.start()
        time.sleep(2)
    print('end')
    obj = redis_pool.instance()
    print(obj)
    print(obj.pool)    

運行結果

<__main__.redis_pool object at 0x7fdf6c0467f0>
ConnectionPool<Connection<host=localhost,port=6379,db=0>>
<__main__.redis_pool object at 0x7fdf6c0467f0>
ConnectionPool<Connection<host=localhost,port=6379,db=0>>
<__main__.redis_pool object at 0x7fdf6c0467f0>
ConnectionPool<Connection<host=localhost,port=6379,db=0>>
<__main__.redis_pool object at 0x7fdf6c0467f0>
ConnectionPool<Connection<host=localhost,port=6379,db=0>>
<__main__.redis_pool object at 0x7fdf6c0467f0>
ConnectionPool<Connection<host=localhost,port=6379,db=0>>
<__main__.redis_pool object at 0x7fdf6c0467f0>
ConnectionPool<Connection<host=localhost,port=6379,db=0>>
<__main__.redis_pool object at 0x7fdf6c0467f0>
ConnectionPool<Connection<host=localhost,port=6379,db=0>>
<__main__.redis_pool object at 0x7fdf6c0467f0>
ConnectionPool<Connection<host=localhost,port=6379,db=0>>
<__main__.redis_pool object at 0x7fdf6c0467f0>
ConnectionPool<Connection<host=localhost,port=6379,db=0>>
<__main__.redis_pool object at 0x7fdf6c0467f0>
ConnectionPool<Connection<host=localhost,port=6379,db=0>>