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Chapter 80. Value to Key Action

Replace the Kafka record key with a new key formed from a fields subset coming from the message body.

80.1. Configuration Options
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The following table summarizes the configuration options available for the value-to-key-action Kamelet:

Expand
PropertyNameDescriptionTypeDefaultExample

fields *

Fields

Comma separated list of fields to be used to form the new key.

string

  

* = Fields marked with an asterisk are mandatory.

80.2. Dependencies
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80.2.1. Quarkus dependencies
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<dependencies>
  <dependency>
    <groupId>org.apache.camel.quarkus</groupId>
    <artifact>camel-quarkus-core</artifact>
  </dependency>
  <dependency>
    <groupId>org.apache.camel.quarkus</groupId>
    <artifact>camel-quarkus-jackson</artifact>
  </dependency>
  <dependency>
    <groupId>org.apache.camel.quarkus</groupId>
    <artifact>camel-quarkus-kafka</artifact>
  </dependency>
  <dependency>
    <groupId>org.apache.camel.quarkus</groupId>
    <artifact>camel-quarkus-kamelet</artifact>
  </dependency>
  <dependency>
    <groupId>org.apache.camel.kamelets</groupId>
    <artifact>camel-kamelets-utils</artifact>
    <version>4.8.5</version>
  </dependency>
</dependencies>
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80.3. Usage
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80.3.1. Camel JBang usage
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80.3.1.1. Prerequisites for JBang
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  • Install JBang.

  • You have executed the following command: 

    jbang app install camel@apache/camel
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80.3.1.2. Running a route with JBang
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Suppose you have a file named route.yaml with this content: 

- route:
    from:
      uri: "kamelet:timer-source"
      parameters:
        period: 10000
        message: 'test'
      steps:
        - to:
            uri: "kamelet:log-sink"
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You can now run it directly through the following command. 

camel run route.yaml
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80.3.2. Knative Action
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You can use the value-to-key-action Kamelet as an intermediate step in a Knative binding.

value-to-key-action-binding.yaml

apiVersion: camel.apache.org/v1
kind: Pipe
metadata:
  name: value-to-key-action-binding
spec:
  source:
    ref:
      kind: Kamelet
      apiVersion: camel.apache.org/v1
      name: timer-source
    properties:
      message: "Hello"
  steps:
  - ref:
      kind: Kamelet
      apiVersion: camel.apache.org/v1
      name: value-to-key-action
    properties:
      fields: "The Fields"
  sink:
    ref:
      kind: Channel
      apiVersion: messaging.knative.dev/v1
      name: mychannel
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80.3.3. Kafka Action
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You can use the value-to-key-action Kamelet as an intermediate step in a Kafka binding.

value-to-key-action-binding.yaml

apiVersion: camel.apache.org/v1
kind: Pipe
metadata:
  name: value-to-key-action-binding
spec:
  source:
    ref:
      kind: Kamelet
      apiVersion: camel.apache.org/v1
      name: timer-source
    properties:
      message: "Hello"
  steps:
  - ref:
      kind: Kamelet
      apiVersion: camel.apache.org/v1
      name: value-to-key-action
    properties:
      fields: "The Fields"
  sink:
    ref:
      kind: KafkaTopic
      apiVersion: kafka.strimzi.io/v1beta1
      name: my-topic
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80.4. Kamelets source file
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https://github.com/jboss-fuse/camel-kamelets/blob/camel-kamelets-4.10.3-branch/kamelets/value-to-key-action.kamelet.yaml

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