cron source Cron Source

Provided by: "Apache Software Foundation"

Support Level for this Kamelet is: "Preview"

Send events at specific time.

Configuration Options

The following table summarizes the configuration options available for the cron-source Kamelet:

Property Name Description Type Default Example

message *

Message

The message to generate

string

"hello world"

schedule *

Cron Schedule

A cron expression that will be used to trigger events generation.

string

"0/3 10 * * * ?"

Fields marked with an asterisk (*) are mandatory.

Dependencies

At runtime, the cron-source Kamelet relies upon the presence of the following dependencies:

  • camel:quartz

  • camel:core

  • camel:cron

  • camel:kamelet

Usage

This section describes how you can use the cron-source.

Knative Source

You can use the cron-source Kamelet as a Knative source by binding it to a Knative object.

cron-source-binding.yaml
apiVersion: camel.apache.org/v1alpha1
kind: KameletBinding
metadata:
  name: cron-source-binding
spec:
  source:
    ref:
      kind: Kamelet
      apiVersion: camel.apache.org/v1alpha1
      name: cron-source
    properties:
      message: "hello world"
      schedule: "0/3 10 * * * ?"
  sink:
    ref:
      kind: Channel
      apiVersion: messaging.knative.dev/v1
      name: mychannel

Prerequisite

You have Camel K installed on the cluster.

Procedure for using the cluster CLI

  1. Save the cron-source-binding.yaml file to your local drive, and then edit it as needed for your configuration.

  2. Run the source by using the following command:

    kubectl apply -f cron-source-binding.yaml

Procedure for using the Kamel CLI

Configure and run the source by using the following command:

kamel bind cron-source -p "source.message=hello world" -p "source.schedule=0/3 10 * * * ?" channel:mychannel

This command creates the KameletBinding in the current namespace on the cluster.

Kafka Source

You can use the cron-source Kamelet as a Kafka source by binding it to a Kafka topic.

cron-source-binding.yaml
apiVersion: camel.apache.org/v1alpha1
kind: KameletBinding
metadata:
  name: cron-source-binding
spec:
  source:
    ref:
      kind: Kamelet
      apiVersion: camel.apache.org/v1alpha1
      name: cron-source
    properties:
      message: "hello world"
      schedule: "0/3 10 * * * ?"
  sink:
    ref:
      kind: KafkaTopic
      apiVersion: kafka.strimzi.io/v1beta1
      name: my-topic

Prerequisites

  • You’ve installed Strimzi.

  • You’ve created a topic named my-topic in the current namespace.

  • You have Camel K installed on the cluster.

Procedure for using the cluster CLI

  1. Save the cron-source-binding.yaml file to your local drive, and then edit it as needed for your configuration.

  2. Run the source by using the following command:

    kubectl apply -f cron-source-binding.yaml

Procedure for using the Kamel CLI

Configure and run the source by using the following command:

kamel bind cron-source -p "source.message=hello world" -p "source.schedule=0/3 10 * * * ?" kafka.strimzi.io/v1beta1:KafkaTopic:my-topic

This command creates the KameletBinding in the current namespace on the cluster.