NATS

NATS Component

NATS is a fast and reliable messaging platform.

Maven users will need to add the following dependency to their pom.xml for this component.

<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-nats</artifactId>
    <!-- use the same version as your Camel core version -->
    <version>x.y.z</version>
</dependency>

URI format

nats:servers[?options]

Where servers represents the list of NATS servers.

Options

Name	Default Value	Description
`servers`	`null`	Defines the servers the component should connect to.
`topic`	`null`	The topic to subscribe/publish to.
`reconnect`	`true`	Whether or not to use the reconnection feature.
`pedantic`	`false`	Whether or not running in pedantic mode (this affects performance).
`verbose`	`false`	Whether or not running in verbose mode
`ssl`	`false`	Whether or not to use SSL
`reconnectTimeWait`	`2000`	Waiting time before attempts reconnection (in milliseconds)
`maxReconnectAttempts`	`3`	Set the maximum number of reconnection attempts in case the connection is lost.
`pingInterval`	`4000`	Ping interval to be aware if connection is still alive (in milliseconds)
`noRandomizeServers`	`false`	Whether or not to randomize the order of servers for the connection attempts
`queueName`	`null`	The Queue name if we are using NATS for a queue configuration (consumer).
`maxMessages`	`null`	Stop receiving messages from a topic we are subscribing to after maxMessages (consumer).
`poolSize`	`10`	Pool size for consumer workers (consumer).

Headers

Name	Type	Description
`CamelNatsMessageTimestamp`	`long`	The timestamp of a consumed message.
`CamelNatsSubscriptionId`	`Integer`	The subscription ID of a consumer.

Producer example:

from("direct:send").to("nats://localhost:4222?topic=test");

Consumer example:

from("nats://localhost:4222?topic=test&maxMessages=5&queueName=test").to("mock:result");