在pika库中,AsyncioConnection
和SelectConnection
是两种不同的适配器,用于与不同的异步IO框架集成,分别是基于asyncio和基于select的。
它们的区别在于底层的异步IO机制不同。AsyncioConnection
是基于asyncio的异步IO框架,而SelectConnection
是基于select的异步IO框架。
下面是一个示例代码,演示了如何在pika中使用AsyncioConnection
和SelectConnection
适配器:
使用AsyncioConnection
适配器:
import asyncio
import pika
async def callback(ch, method, properties, body):
print("Received message:", body.decode())
await asyncio.sleep(1) # 模拟处理消息的耗时操作
ch.basic_ack(delivery_tag=method.delivery_tag)
async def consume():
connection = await pika.AsyncioConnection(pika.ConnectionParameters('localhost'))
channel = await connection.channel()
await channel.queue_declare(queue='my_queue')
await channel.basic_consume(queue='my_queue', on_message_callback=callback)
print('Waiting for messages...')
await asyncio.Future() # 持续等待消息
loop = asyncio.get_event_loop()
loop.run_until_complete(consume())
使用SelectConnection
适配器:
import select
import pika
def callback(ch, method, properties, body):
print("Received message:", body.decode())
ch.basic_ack(delivery_tag=method.delivery_tag)
def consume():
connection = pika.SelectConnection(pika.ConnectionParameters('localhost'), on_open_callback=on_open)
connection.ioloop.start()
def on_open(connection):
connection.channel(on_channel_open)
def on_channel_open(channel):
channel.queue_declare(queue='my_queue', callback=on_queue_declared)
def on_queue_declared(frame):
channel.basic_consume(queue='my_queue', on_message_callback=callback)
print('Waiting for messages...')
consume()
这两个示例代码分别演示了使用AsyncioConnection
和SelectConnection
适配器来消费来自RabbitMQ的消息。根据你的异步IO框架的选择,你可以选择适合的适配器来进行集成。