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Chapter 69. Throttle Action

The Throttle action allows you to ensure that a specific sink does not get overloaded.

69.1. Configuration Options

The following table summarizes the configuration options available for the throttle-action Kamelet:

Property	Name	Description	Type	Default	Example
messages *	Messages Number	The number of messages to send in the time period set	integer		`10`
timePeriod	Time Period	Sets the time period during which the maximum request count is valid for, in milliseconds	string	`"1000"`

Note

Fields marked with an asterisk (*) are mandatory.

69.2. Dependencies

At runtime, the throttle-action Kamelet relies upon the presence of the following dependencies:

camel:core
camel:kamelet

69.3. Usage

This section describes how you can use the throttle-action.

69.3.1. Knative Action

You can use the throttle-action Kamelet as an intermediate step in a Knative binding.

throttle-action-binding.yaml

apiVersion: camel.apache.org/v1alpha1
kind: KameletBinding
metadata:
  name: throttle-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: throttle-action
    properties:
      messages: 1
  sink:
    ref:
      kind: Channel
      apiVersion: messaging.knative.dev/v1
      name: mychannel

69.3.1.1. Prerequisite

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

Save the throttle-action-binding.yaml file to your local drive, and then edit it as needed for your configuration.
Run the action by using the following command:
```
oc apply -f throttle-action-binding.yaml
```

69.3.1.3. Procedure for using the Kamel CLI

Configure and run the action by using the following command:

kamel bind timer-source?message=Hello --step throttle-action -p "step-0.messages=10" channel:mychannel

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

69.3.2. Kafka Action

You can use the throttle-action Kamelet as an intermediate step in a Kafka binding.

throttle-action-binding.yaml

apiVersion: camel.apache.org/v1alpha1
kind: KameletBinding
metadata:
  name: throttle-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: throttle-action
    properties:
      messages: 1
  sink:
    ref:
      kind: KafkaTopic
      apiVersion: kafka.strimzi.io/v1beta1
      name: my-topic

69.3.2.1. 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.

69.3.2.2. Procedure for using the cluster CLI

Save the throttle-action-binding.yaml file to your local drive, and then edit it as needed for your configuration.
Run the action by using the following command:
```
oc apply -f throttle-action-binding.yaml
```

69.3.2.3. Procedure for using the Kamel CLI

Configure and run the action by using the following command:

kamel bind timer-source?message=Hello --step throttle-action -p "step-0.messages=1" kafka.strimzi.io/v1beta1:KafkaTopic:my-topic

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

69.4. Kamelet source file

https://github.com/openshift-integration/kamelet-catalog/throttle-action.kamelet.yaml