counter source Counter Source

Provided by: "Apache Software Foundation"

Support Level for this Kamelet is: "Stable"

Generates sequential number events starting from a configurable value, incrementing by a specified step. Useful for testing, scheduled tasks, or creating ordered event sequences.

Configuration Options

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

Property Name Description Type Default Example

numbers

Numbers

How many numbers to generate.

integer

period

Period

The time interval between two numbers.

integer

1000

start

Starting Number

The starting number.

integer

1

Dependencies

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

  • camel:timer

  • camel:core

  • camel:bean

  • camel:kamelet

Camel JBang usage

Prerequisites

  • You’ve installed JBang.

  • You have executed the following command:

jbang app install camel@apache/camel

Supposing you have a file named route.yaml with this content:

- route:
    from:
      uri: "kamelet:counter-source"
      parameters:
        .
        .
        .
      steps:
        - to:
            uri: "kamelet:log-sink"

You can now run it directly through the following command

camel run route.yaml

Counter Source Kamelet Description

This Kamelet provides a simple counting source that generates sequential numbers at configurable intervals. It starts from a specified number and counts upward (1, 2, 3, …​) with each timer tick.

Output format

The Kamelet outputs each number as a plain text integer. Each message contains a single number that increments from the starting value.

Special headers

The Kamelet sets the following header:

  • Content-Type: text/plain

Configuration options

The Kamelet allows you to configure:

  • period: Time interval between numbers (default: 1000ms)

  • start: Starting number (default: 1)

  • numbers: Total count of numbers to generate (optional - if not set, runs indefinitely)

Usage examples

Basic counter starting from 1:

- route:
    from:
      uri: "kamelet:counter-source"
      steps:
        - to:
            uri: "kamelet:log-sink"

Counter with custom starting point and interval:

- route:
    from:
      uri: "kamelet:counter-source"
      parameters:
        start: 100
        period: 500
      steps:
        - to:
            uri: "kamelet:log-sink"

Generate exactly 10 numbers:

- route:
    from:
      uri: "kamelet:counter-source"
      parameters:
        start: 1
        numbers: 10
        period: 2000
      steps:
        - to:
            uri: "kamelet:log-sink"

Kamelet source file

https://github.com/apache/camel-kamelets/blob/main/kamelets/counter-source.kamelet.yaml

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