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Chapter 69. Timer Source

Produces periodic events with a custom payload.

69.1. Configuration Options
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The following table summarizes the configuration options available for the timer-source Kamelet:

Expand
PropertyNameDescriptionTypeDefaultExample

message *

Message

The message to generate

string

 

"hello world"

contentType

Content Type

The content type of the message being generated

string

"text/plain"

 

period

Period

The interval between two events in milliseconds

integer

1000

 

repeatCount

Repeat Count

Specifies the maximum limit of the number of fires

integer

  
Note

Fields marked with an asterisk (*) are mandatory.

69.2. Dependencies
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At runtime, the timer-source Kamelet relies upon the presence of the following dependencies:

  • camel:core
  • camel:timer
  • camel:kamelet

69.3. Usage
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This section describes how you can use the timer-source.

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

timer-source-binding.yaml

apiVersion: camel.apache.org/v1alpha1
kind: KameletBinding
metadata:
  name: timer-source-binding
spec:
  source:
    ref:
      kind: Kamelet
      apiVersion: camel.apache.org/v1alpha1
      name: timer-source
    properties:
      message: "hello world"
  sink:
    ref:
      kind: Channel
      apiVersion: messaging.knative.dev/v1
      name: mychannel
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69.3.1.1. Prerequisite
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Make sure you have "Red Hat Integration - Camel K" installed into the OpenShift cluster you’re connected to.

69.3.1.2. Procedure for using the cluster CLI
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  1. Save the timer-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: 

    oc apply -f timer-source-binding.yaml
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69.3.1.3. Procedure for using the Kamel CLI
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Configure and run the source by using the following command: 

kamel bind timer-source -p "source.message=hello world" channel:mychannel
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This command creates the KameletBinding in the current namespace on the cluster.

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

timer-source-binding.yaml

apiVersion: camel.apache.org/v1alpha1
kind: KameletBinding
metadata:
  name: timer-source-binding
spec:
  source:
    ref:
      kind: Kamelet
      apiVersion: camel.apache.org/v1alpha1
      name: timer-source
    properties:
      message: "hello world"
  sink:
    ref:
      kind: KafkaTopic
      apiVersion: kafka.strimzi.io/v1beta1
      name: my-topic
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69.3.2.1. Prerequisites
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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.

69.3.2.2. Procedure for using the cluster CLI
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  1. Save the timer-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: 

    oc apply -f timer-source-binding.yaml
    Copy to Clipboard Toggle word wrap

69.3.2.3. Procedure for using the Kamel CLI
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Configure and run the source by using the following command: 

kamel bind timer-source -p "source.message=hello world" kafka.strimzi.io/v1beta1:KafkaTopic:my-topic
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This command creates the KameletBinding in the current namespace on the cluster.

69.4. Kamelet source file
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https://github.com/openshift-integration/kamelet-catalog/timer-source.kamelet.yaml

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