https://github.com/kostya/cron_scheduler

Simple job scheduler with crontab patterns for Crystal Language.
https://github.com/kostya/cron_scheduler

Last synced: about 1 month ago
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Simple job scheduler with crontab patterns for Crystal Language.

• Host: GitHub
• URL: https://github.com/kostya/cron_scheduler
• Owner: kostya
• License: mit
• Created: 2015-10-31T21:08:22.000Z (about 9 years ago)
• Default Branch: master
• Last Pushed: 2023-04-08T09:13:33.000Z (over 1 year ago)
• Last Synced: 2024-10-25T01:30:24.322Z (about 2 months ago)
• Language: Crystal
• Homepage:
• Size: 14.6 KB
• Stars: 47
• Watchers: 6
• Forks: 5
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

Awesome Lists containing this project

• awesome-crystal - cron_scheduler - Job scheduler with crontab patterns (Scheduling)

README

        
# CronScheduler

Simple job scheduler with crontab patterns for Crystal Language.

## Installation

Add this to your application's `shard.yml`:

```yaml

dependencies:

  cron_scheduler:

    github: kostya/cron_scheduler

```

## Usage

```crystal

require "cron_scheduler"

require "log"

CronScheduler.define do

  # normal crontab syntax, 5 tokens (minute, hour, day, month, wday)

  at("* * * * *") { Log.info { "every 1 minute" } }

  at("*/5 20-23 * * *") { Log.info { "every 5 minutes between 20-23 hours" } }

  at("*/2 */3 * * *") { Log.info { "every 2 minute every 3 hours" } }

  at("45 * * * *") { Log.info { "every hour at :45" } }

  at("* * * * SUN") { Log.info { "every 1 minute in sunday" } }

  # I added extra syntax, when 6 tokens, first one parsed as seconds

  # (second, minute, hour, day, month, wday)

  at("*/3 * * * * *") { Log.info { "every 3.seconds" } }

  at("20-45/5 * * * * *") { Log.info { "every 5.seconds between 20-45" } }

  at("11,22,33,44-60/2 * * * * *") { Log.info { "every 11,22,33,44-60/2 seconds" } }

end

Log.info {  "Scheduler started" }

# sleep will prevent exiting at the end of the script

sleep

```

## Crontab Format

![Eye](http://www.webenabled.com/sites/default/files/crontab-syntax.gif)