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Chapter 46. Kafka Topic Name Matches Filter Action


Filter based on kafka topic value compared to regex

46.1. Configuration Options

The following table summarizes the configuration options available for the topic-name-matches-filter-action Kamelet:

PropertyNameDescriptionTypeDefaultExample

regex *

Regex

The Regex to Evaluate against the Kafka topic name

string

  
Note

Fields marked with an asterisk (*) are mandatory.

46.2. Dependencies

At runtime, the topic-name-matches-filter-action Kamelet relies upon the presence of the following dependencies:

  • camel:core
  • camel:kamelet

46.3. Usage

This section describes how you can use the topic-name-matches-filter-action.

46.3.1. Kafka Action

You can use the topic-name-matches-filter-action Kamelet as an intermediate step in a Kafka binding.

topic-name-matches-filter-action-binding.yaml

apiVersion: camel.apache.org/v1alpha1
kind: KameletBinding
metadata:
  name: topic-name-matches-filter-action-binding
spec:
  source:
    ref:
      kind: Kamelet
      apiVersion: camel.apache.org/v1alpha1
      name: timer-source
    properties:
      message: "Hello"
  steps:
  - ref:
      kind: Kamelet
      apiVersion: camel.apache.org/v1alpha1
      name: topic-name-matches-filter-action
    properties:
      regex: "The Regex"
  sink:
    ref:
      kind: KafkaTopic
      apiVersion: kafka.strimzi.io/v1beta1
      name: my-topic
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46.3.1.1. Prerequisites

Ensure that you’ve installed the AMQ Streams operator in your OpenShift cluster and created a topic named my-topic in the current namespace. Make also sure you have "Red Hat Integration - Camel K" installed into the OpenShift cluster you’re connected to.

46.3.1.2. Procedure for using the cluster CLI

  1. Save the topic-name-matches-filter-action-binding.yaml file to your local drive, and then edit it as needed for your configuration.
  2. Run the action by using the following command:

    oc apply -f topic-name-matches-filter-action-binding.yaml
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46.3.1.3. Procedure for using the Kamel CLI

Configure and run the action by using the following command:

kamel bind timer-source?message=Hello --step topic-name-matches-filter-action -p "step-0.regex=The Regex" kafka.strimzi.io/v1beta1:KafkaTopic:my-topic
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This command creates the KameletBinding in the current namespace on the cluster.

46.4. Kamelet source file

https://github.com/openshift-integration/kamelet-catalog/topic-name-matches-filter-action.kamelet.yaml

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