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Chapter 95. RabbitMQ

RabbitMQ Component
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Available as of Camel 2.12
The rabbitmq: component allows you produce and consume messages from RabbitMQ instances. Using the RabbitMQ AMQP client, this component offers a pure RabbitMQ approach over the generic AMQP component.
Maven users will need to add the following dependency to their pom.xml for this component: 
<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-rabbitmq</artifactId>
    <version>x.x.x</version>
    <!-- use the same version as your Camel core version -->
</dependency>
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URI format
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rabbitmq://hostname[:port]/exchangeName?[options]
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Where hostname is the hostname of the running rabbitmq instance or cluster. Port is optional and if not specified then defaults to the RabbitMQ client default (5672). The exchange name determines which exchange produced messages will sent to. In the case of consumers, the exchange name determines which exchange the queue will bind to.

Options
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Expand
Property Default Description
autoAck true If messages should be auto acknowledged
autoDelete true If it is true, the message will be deleted when it is consumed
durable true If message is durable
queue random uuid The queue to receive messages from
routingKey null The routing key to use when binding a consumer queue to the exchange. For producer routing keys, you set the header (see header section)
threadPoolSize 10 The consumer uses a Thread Pool Executor with a fixed number of threads. This setting allows you to set that number of threads.
username null username in case of authenticated access
password null password for authenticated access
vhost / the vhost for the channel

Headers
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The following headers are set on exchanges when consuming messages.
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Property Value
rabbitmq.ROUTING_KEY The routing key that was used to receive the message, or the routing key that will be used when producing a message
rabbitmq.EXCHANGE_NAME The exchange the message was received from
rabbitmq.DELIVERY_TAG The rabbitmq delivery tag of the received message
The following headers are used by the producer. If these are set on the camel exchange then they will be set on the RabbitMQ message.
Expand
Property Value
rabbitmq.ROUTING_KEY The routing key that will be used when sending the message
rabbitmq.EXCHANGE_NAME The exchange the message was received from, or sent to
rabbitmq.CONTENT_TYPE The contentType to set on the RabbitMQ message
rabbitmq.PRIORITY The priority header to set on the RabbitMQ message
rabbitmq.CORRELATIONID The correlationId to set on the RabbitMQ message
rabbitmq.MESSAGE_ID The message id to set on the RabbitMQ message
rabbitmq.DELIVERY_MODE If the message should be persistent or not
rabbitmq.USERID The userId to set on the RabbitMQ message
rabbitmq.CLUSTERID The clusterId to set on the RabbitMQ message
rabbitmq.REPLY_TO The replyTo to set on the RabbitMQ message
rabbitmq.CONTENT_ENCODING The contentEncoding to set on the RabbitMQ message
rabbitmq.TYPE The type to set on the RabbitMQ message
rabbitmq.EXPIRATION The expiration to set on the RabbitMQ message
rabbitmq.TIMESTAMP The timestamp to set on the RabbitMQ message
rabbitmq.APP_ID The appId to set on the RabbitMQ message
Headers are set by the consumer once the message is received. The producer will also set the headers for downstream processors once the exchange has taken place. Any headers set prior to production that the producer sets will be overriden.

Message Body
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The component will use the camel exchange in body as the rabbit mq message body. The camel exchange in object must be convertible to a byte array. Otherwise the producer will throw an exception of unsupported body type.

Samples
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To receive messages from a queue that is bound to an exchange A with the routing key B, 
from("rabbitmq://localhost/A?routingKey=B")
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To receive messages from a queue with a single thread with auto acknowledge disabled. 
from("rabbitmq://localhost/A?routingKey=B&threadPoolSize=1&autoAck=false")
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To send messages to an exchange called C 
...to("rabbitmq://localhost/B")
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