Python 操作消息队列
阅读目录
- 图示
- 插入消息队列代码
- 读取消息队列数据
图示
其中P指producer，即生产者；C指consumer，即消费者。中间的红色表示消息队列，实例中表现为HELLO队列。
往队列里插入数据前，查看消息队列
$sudo rabbitmqctl list_queues Listing queues ... celeryev.db53a5e0-1e6a-4f06-a9f7-2c104c4612fb 0 ...done.
插入消息队列代码
#in_queue.py
#coding=utf8 import pika connection = pika.BlockingConnection(pika.ConnectionParameters('localhost')) channel = connection.channel() #声明队列，如果消息发送到不存在的队列，rabbitmq会自动清除这些消息 channel.queue_declare(queue='HELLO') for i in range(10): #exchange表示交换器，可以精确的制定消息应发到哪个队列，route_key设置队列的名称，body表示发送的内容 channel.basic_publish(exchange='', routing_key='HELLO', body='Hello World!' + str(i)) print " [%d] Sent 'Hello World!'" % i #关闭连接 connection.close()
执行结果
$python in_queue.py [0] Sent 'Hello World!' [1] Sent 'Hello World!' [2] Sent 'Hello World!' [3] Sent 'Hello World!' [4] Sent 'Hello World!' [5] Sent 'Hello World!' [6] Sent 'Hello World!' [7] Sent 'Hello World!' [8] Sent 'Hello World!' [9] Sent 'Hello World!'
此时查看消息队列
$sudo rabbitmqctl list_queues Listing queues ... HELLO 10 celeryev.db53a5e0-1e6a-4f06-a9f7-2c104c4612fb 0 ...done.
可以看到队列HELLO里面有10条数据。
读取消息队列数据
#out_queue.py
#coding=utf8 import pika connection = pika.BlockingConnection(pika.ConnectionParameters('localhost')) channel = connection.channel() channel.queue_declare(queue='HELLO') def callback(ch, method, properties, body): print "Received %r" % (body,) channel.basic_consume(callback, queue='HELLO', no_ack=True) print ' [*] Waiting for messages. To exit press CTRL+C' channel.start_consuming()
执行结果
$python out_queue.py [*] Waiting for messages. To exit press CTRL+C [x] Received 'Hello World!0'Received 'Hello World!1'Received 'Hello World!2'Received 'Hello World!3'Received 'Hello World!4'Received 'Hello World!5'Received 'Hello World!6'Received 'Hello World!7'Received 'Hello World!8'Received 'Hello World!9'
此时查看消息队列
$sudo rabbitmqctl list_queues Listing queues ... HELLO 0 celeryev.db53a5e0-1e6a-4f06-a9f7-2c104c4612fb 0 ...done.
可以看到队列HELLO中的数据被读走了，条数为0。
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