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Chapter 77. Throttle Action

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

77.1. Configuration Options
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The following table summarizes the configuration options available for the throttle-action Kamelet:

Expand
PropertyNameDescriptionTypeDefaultExample

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

 

* = Fields marked with an asterisk are mandatory.

77.2. Dependencies
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77.2.1. Quarkus dependencies
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<dependencies>
  <dependency>
    <groupId>org.apache.camel.quarkus</groupId>
    <artifact>camel-quarkus-core</artifact>
  </dependency>
  <dependency>
    <groupId>org.apache.camel.quarkus</groupId>
    <artifact>camel-quarkus-kamelet</artifact>
  </dependency>
  <dependency>
    <groupId>org.apache.camel.kamelets</groupId>
    <artifact>camel-kamelets-utils</artifact>
    <version>4.8.5</version>
  </dependency>
</dependencies>

77.3. Usage
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77.3.1. Camel JBang usage
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77.3.1.1. Prerequisites for JBang
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  • Install JBang.

  • You have executed the following command: 

    jbang app install camel@apache/camel

77.3.1.2. Running a route with JBang
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Suppose you have a file named route.yaml with this content: 

- route:
    from:
      uri: "kamelet:timer-source"
      parameters:
        period: 10000
        message: 'test'
      steps:
        - to:
            uri: "kamelet:log-sink"

You can now run it directly through the following command. 

camel run route.yaml

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

throttle-action-binding.yaml

apiVersion: camel.apache.org/v1
kind: Pipe
metadata:
  name: throttle-action-binding
spec:
  source:
    ref:
      kind: Kamelet
      apiVersion: camel.apache.org/v1
      name: timer-source
    properties:
      message: "Hello"
  steps:
  - ref:
      kind: Kamelet
      apiVersion: camel.apache.org/v1
      name: throttle-action
    properties:
      messages: 1
  sink:
    ref:
      kind: Channel
      apiVersion: messaging.knative.dev/v1
      name: mychannel

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

throttle-action-binding.yaml

apiVersion: camel.apache.org/v1
kind: Pipe
metadata:
  name: throttle-action-binding
spec:
  source:
    ref:
      kind: Kamelet
      apiVersion: camel.apache.org/v1
      name: timer-source
    properties:
      message: "Hello"
  steps:
  - ref:
      kind: Kamelet
      apiVersion: camel.apache.org/v1
      name: throttle-action
    properties:
      messages: 1
  sink:
    ref:
      kind: KafkaTopic
      apiVersion: kafka.strimzi.io/v1beta1
      name: my-topic

77.4. Kamelets source file
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https://github.com/jboss-fuse/camel-kamelets/blob/camel-kamelets-4.10.3-branch/kamelets/throttle-action.kamelet.yaml

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