Chapter 58. Throttle Action
The Throttle action allows you to ensure that a specific sink does not get overloaded.
58.1. 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 |
| |
| timePeriod | Time Period | Sets the time period during which the maximum request count is valid for, in milliseconds | string |
|
Fields marked with an asterisk (*) are mandatory.
58.2. Dependencies
At runtime, the throttle-action Kamelet relies upon the presence of the following dependencies:
- camel:core
- camel:kamelet
58.3. Usage
This section describes how you can use the throttle-action.
58.3.1. 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
58.3.1.1. Prerequisite
Make sure you have "Red Hat Integration - Camel K" installed into the OpenShift cluster you’re connected to.
58.3.1.2. Procedure for using the cluster CLI
-
Save the
throttle-action-binding.yamlfile 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
58.3.1.3. 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.
58.3.2. 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
58.3.2.1. 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.
58.3.2.2. Procedure for using the cluster CLI
-
Save the
throttle-action-binding.yamlfile 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
58.3.2.3. 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.
