RabbitMQ

RabbitMQ is an open-source message-broker software (sometimes called message-oriented middleware) that originally implemented the Advanced Message Queuing Protocol (AMQP) and has since been extended with a plug-in architecture to support Streaming Text Oriented Messaging Protocol (STOMP), MQ Telemetry Transport (MQTT), and other protocols.[1]

RabbitMQ
Developer(s)Pivotal Software
Stable release
3.8.11 / January 22, 2021 (2021-01-22)
Repositorygithub.com/rabbitmq
Written inErlang
Operating systemCross-platform
TypeAMQP, message-oriented middleware
LicenseMozilla Public License
Websitewww.rabbitmq.com

The RabbitMQ server program is written in the Erlang programming language and is built on the Open Telecom Platform framework for clustering and failover. Client libraries to interface with the broker are available for all major programming languages.

History

Rabbit Technologies Ltd. originally developed RabbitMQ. Rabbit Technologies started as a joint venture between LShift and CohesiveFT in 2007,[2] and was acquired in April 2010 by SpringSource, a division of VMware.[3] The project became part of Pivotal Software in May 2013.[4]

The source code is released under the Mozilla Public License. The project consists of:

  • The RabbitMQ exchange server itself
  • Gateways for AMQP, HTTP, STOMP, and MQTT protocols
  • AMQP client libraries for Java, .NET Framework, and Erlang. (AMQP clients for other languages are available from other vendors.)
  • A plug-in platform for custom additions, with a pre-defined collection of supported plug-ins, including:
    • A "Shovel" plug-in that takes care of moving or copying (replicating) messages from one broker to another.
    • A "Federation" plug-in that enables efficient sharing of messages between brokers (at the exchange level).
    • A "Management" plug-in that enables monitoring and control of brokers and clusters of brokers.

Examples

This section gives sample programs written in Python (using the pika package) for sending and receiving messages using a queue.

Sending

The following code fragment establishes a connection, makes sure the recipient queue exists, then sends a message and finally closes the connection.

#!/usr/bin/env python3
import pika

connection = pika.BlockingConnection(pika.ConnectionParameters(host="localhost"))
channel = connection.channel()
channel.queue_declare(queue="hello")
channel.basic_publish(exchange="", routing_key="hello", body="Hello World!")
print(" [x] Sent 'Hello World!'")
connection.close()

Receiving

Similarly, the following program receives messages from the queue and prints them on the screen: (Note: This example does not acknowledge receipt of the message.)

#!/usr/bin/env python3
import pika

connection = pika.BlockingConnection(pika.ConnectionParameters(host="localhost"))
channel = connection.channel()
channel.queue_declare(queue="hello")
print(" [*] Waiting for messages. To exit press Ctrl+C")


def callback(ch, method, properties, body):
    print(" [x] Received %r" % body)


channel.basic_consume(queue="hello", on_message_callback=callback)
channel.start_consuming()

See also

References
  1. Which protocols does RabbitMQ support?
  2. "Launch of RabbitMQ Open Source Enterprise Messaging" (PDF). Press release. February 8, 2007. Retrieved October 23, 2013.
  3. "Rabbit Technologies announce acquisition by SpringSource". Press release. April 13, 2010. Archived from the original on April 18, 2010. Retrieved October 3, 2013.
  4. "Proudly part of Pivotal". Press release. May 14, 2010. Archived from the original on June 2, 2013. Retrieved October 3, 2013.

Further reading
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