Direct exchange
在此設置中，我們可以看到綁定了兩個隊列的直接交換X。第一個隊列由綁定鍵orange綁定，第二個隊列有兩個綁定，一個綁定鍵爲black，另一個綁定爲green。
在這樣的設置中，使用路由鍵orange發佈到交換機的消息 將被路由到隊列Q1。路由鍵爲black 或green的消息將轉到Q2。所有其他消息將被丟棄。
Multiple bindings
用相同的routing_key綁定多個隊列是完全合法的。在我們的示例中，我們可以使用綁定鍵black在X和Q1之間添加綁定。
在這種情況下，直接交換的行爲將類似於fanout，並將消息廣播到所有匹配的隊列。帶有black路由鍵的消息將同時傳遞到 Q1和Q2。
Putting it all together
send.py
#!/usr/bin/env python
import pika
import sys
connection = pika.BlockingConnection(
pika.ConnectionParameters(host='localhost'))
channel = connection.channel()
channel.exchange_declare(exchange='direct_logs', exchange_type='direct')
severity = sys.argv[1] if len(sys.argv) > 1 else 'info'
message = ' '.join(sys.argv[2:]) or 'Hello World!'
channel.basic_publish(
exchange='direct_logs', routing_key=severity, body=message)
print(" [x] Sent %r:%r" % (severity, message))
connection.close()
receive.py
#!/usr/bin/env python
import pika
import sys
connection = pika.BlockingConnection(
pika.ConnectionParameters(host='localhost'))
channel = connection.channel()
channel.exchange_declare(exchange='direct_logs', exchange_type='direct')
result = channel.queue_declare(queue='', exclusive=True)
queue_name = result.method.queue
severities = sys.argv[1:]
if not severities:
sys.stderr.write("Usage: %s [info] [warning] [error]\n" % sys.argv[0])
sys.exit(1)
for severity in severities:
channel.queue_bind(
exchange='direct_logs', queue=queue_name, routing_key=severity)
print(' [*] Waiting for logs. To exit press CTRL+C')
def callback(ch, method, properties, body):
print(" [x] %r:%r" % (method.routing_key, body))
channel.basic_consume(
queue=queue_name, on_message_callback=callback, auto_ack=True)
channel.start_consuming()