https://github.com/jmrozanec/cron-utils-sisyphus

Scala scheduler. As Sisyphus, will execute the task again and again, repeating the action for eternity.
https://github.com/jmrozanec/cron-utils-sisyphus

Last synced: 8 months ago
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Scala scheduler. As Sisyphus, will execute the task again and again, repeating the action for eternity.

• Host: GitHub
• URL: https://github.com/jmrozanec/cron-utils-sisyphus
• Owner: jmrozanec
• License: apache-2.0
• Created: 2016-06-01T23:39:16.000Z (almost 10 years ago)
• Default Branch: master
• Last Pushed: 2022-08-01T16:19:24.000Z (over 3 years ago)
• Last Synced: 2025-05-18T00:40:01.253Z (11 months ago)
• Language: Scala
• Size: 11.7 KB
• Stars: 3
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
Sisyphus

===========

A Scala scheduler that supports multiple cron notations. The project follows the [Semantic Versioning Convention](http://semver.org/) and uses Apache 2.0 license.

## How to use it?

    import com.cronutils.model.CronType

    import com.cronutils.model.definition.CronDefinitionBuilder

    import com.cronutils.parser.CronParser

    import com.cronutils.sisyphus.model.{CronTask, Scheduler}

    import org.joda.time.DateTime

    

    val scheduler = new Scheduler()

    

    //declare parsers and crons. We support parsing multiple cron formats!

    val quartzparser = new CronParser(CronDefinitionBuilder.instanceDefinitionFor(CronType.QUARTZ))

    val unixcronparser = new CronParser(CronDefinitionBuilder.instanceDefinitionFor(CronType.UNIX))

    var qzcron = quartzparser.parse("*/5 * * * * ? *")

    var nixcron = unixcronparser.parse("* * * * *")

    

    //define tasks to be executed!

    val qzcrontask = new CronTask("qztimeprinter") {

      override def execute(): Unit = println(s"We got a Quartz match! ${DateTime.now()}")

    }

    val nixcrontask = new CronTask("nixtimeprinter") {

      override def execute(): Unit = println(s"We got a Unix match! ${DateTime.now()}")

    }

    

    //schedule and enjoy!

    scheduler.schedule(qzcron, qzcrontask)

    scheduler.schedule(nixcron, nixcrontask)

Sisyphus leverages [cron-utils](https://github.com/jmrozanec/cron-utils) library to parse cron expressions and find if a date matches it. You can use any cron-expression to schedule a task.

# Resources

 * [A list of papers published on this topic](http://stackoverflow.com/questions/6004978/what-is-a-calendar-queue)

 * [1977: An efficient data structure for the simulation event set](http://dl.acm.org/citation.cfm?id=359801)

 * [1979: A Simple and Robust Data Structure for the Simulation Event Set](http://technologists.com/sauer/RC8001.pdf)

 * [1988: Calendar Queues: A Fast O(1) Priority Queue Implementation for the Simulation Event Set Problem](http://pi4.informatik.uni-mannheim.de/pi4.data/content/courses/2004-ss/netsim/area51/Brown1988a.pdf)

 * [2000: Snoopy calendar queue](http://www.informs-sim.org/wsc00papers/068.PDF)

 * [Study of Optimised bucket widths in Calendar Queue for Discrete Event Simulator](http://pioneer.netserv.chula.ac.th/~achaodit/paper5.pdf)

 * [Ladder queue: An O(1) priority queue structure for large-scale discrete event simulation](http://dl.acm.org/citation.cfm?id=1103324)