Apache Camel™ as a Kura cloud service

The default way to create a new cloud service instance backed by Camel is to use the new Web UI for cloud services. A new cloud service instance of the type org.eclipse.kura.camel.cloud.factory.CamelFactory has to be created. In addition to that a set of Camel routes have to be provided.

The interface with the Kura application is the Camel vm component. Information set "upstream" from the Kura application can be received by the Camel cloud service instance of the following endpoint vm:camel:example. Where camel is the application id and example is the topic.

The following code snippet writes out all of the Kura payload structure received on this topic to the logger system:

<?xml version="1.0" encoding="UTF-8"?>
<routes xmlns="http://camel.apache.org/schema/spring">

  <route id="camel-example-topic">
    <from uri="vm:camel:example"/>
    <split>
      <simple>${body.metrics().entrySet()}</simple>
      <setHeader headerName="item">
        <simple>${body.key()}</simple>
      </setHeader>
      <setBody>
        <simple>${body.value()}</simple>
      </setBody>
      <toD uri="log:kura.data.${header.item}"/>
    </split>
  </route>

</routes>

The snippet splits up the incoming KuraPayload structure and creates a logger called kura.data.<metric> for each metric and writes out the actual value to it. The output in the log file should look like:

2016-11-14 16:14:34,539 [Camel (camel-10) thread #18 - vm://camel:example] INFO  k.d.intValue - Exchange[ExchangePattern: InOnly, BodyType: Long, Body: 19]
2016-11-14 16:14:34,566 [Camel (camel-10) thread #18 - vm://camel:example] INFO  k.d.doubleValue - Exchange[ExchangePattern: InOnly, BodyType: Double, Body: 10.226808617581144]
2016-11-14 16:14:35,575 [Camel (camel-10) thread #18 - vm://camel:example] INFO  k.d.intValue - Exchange[ExchangePattern: InOnly, BodyType: Long, Body: 19]
2016-11-14 16:14:35,602 [Camel (camel-10) thread #18 - vm://camel:example] INFO  k.d.doubleValue - Exchange[ExchangePattern: InOnly, BodyType: Double, Body: 10.27218775669447]
2016-11-14 16:14:36,539 [Camel (camel-10) thread #18 - vm://camel:example] INFO  k.d.intValue - Exchange[ExchangePattern: InOnly, BodyType: Long, Body: 19]
2016-11-14 16:14:36,567 [Camel (camel-10) thread #18 - vm://camel:example] INFO  k.d.doubleValue - Exchange[ExchangePattern: InOnly, BodyType: Double, Body: 10.314456684208022]