cron source Cron Source

Provided by: "Apache Software Foundation"

Support Level for this Kamelet is: "Stable"

Send events at specific time.

Configuration Options

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

Property Name Description Type Default Example

message

Message

Required The message to generate.

string

hello world

schedule

Cron Schedule

Required A cron expression that is used to trigger events generation.

string

0/3 10 * * * ?

Dependencies

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

  • camel:quartz

  • camel:core

  • camel:cron

  • 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:cron-source"
      parameters:
        .
        .
        .
      steps:
        - to:
            uri: "kamelet:log-sink"

You can now run it directly through the following command

camel run route.yaml

Cron Source Kamelet Description

This Kamelet provides a cron-based scheduler that sends events at specific times defined by a cron expression. It allows you to generate custom messages according to a cron schedule.

Output format

The Kamelet outputs the configured message as plain text content at the times specified by the cron expression.

Configuration requirements

This Kamelet requires the following mandatory properties:

  • schedule: A cron expression that defines when events should be triggered

  • message: The text message to send when the schedule triggers

Cron expression format

The cron expression follows the standard format:

<seconds> <minutes> <hours> <day-of-month> <month> <day-of-week> [year]

Usage examples

Send a message every 3 seconds during the 10th hour:

- route:
    from:
      uri: "kamelet:cron-source"
      parameters:
        schedule: "0/3 10 * * * ?"
        message: "hello world"
      steps:
        - to:
            uri: "kamelet:log-sink"

Send a daily reminder at 9 AM:

- route:
    from:
      uri: "kamelet:cron-source"
      parameters:
        schedule: "0 0 9 * * ?"
        message: "Daily reminder: Check your tasks!"
      steps:
        - to:
            uri: "kamelet:log-sink"

Send a message every Monday at 8:30 AM:

- route:
    from:
      uri: "kamelet:cron-source"
      parameters:
        schedule: "0 30 8 ? * MON"
        message: "Weekly team meeting reminder"
      steps:
        - to:
            uri: "kamelet:log-sink"

Kamelet source file

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

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