A simple scheduler based on Akka.

    val stack = mutable.Stack[String]()

    val expression = CronExpression("0 0 2-3 * * * *")

    SimpleScheduler.start()
    
    SimpleScheduler.scheduleJob(expression, Job("Add to stack", Runnable {
      stack.push("Hi")
    }))
    

    CronExpression cronExpression = new CronExpression("* * * * * * *");
    
    SimpleScheduler.scheduleJob(cronExpression, new Job("A Job!", () -> System.out.println("run....")));
    
    SimpleScheduler.start();

• Pattern: "SM MH HD DM DW MY YY"

SM: Second of minute
MH: Minute of the hour
HD: Hour of the day
DM: Day of the Month
DW: Day of the week
MY: Month of the year
YY: Year

• Each Cron Item can take:

"*": Match any value of a given instance
"\d+(,\d+)*": Match one value or a list of values
"\d+/\d+": Match a starting value and a step
"\d+-\d+(/\d+)": Match a range and optionaly a step inside the range

 Possible values depends on the domain of the particular cron item (eg: to Seconds will be 0-59)

• Examples:

"* * * * * * *" -> Every second
"0 * * * * * *" -> Each 0 second of every minute
"* 0 * * * * *" -> Every second at minute 0 of every hour
"0 0 13 * 1 * *" -> Every monday at 1 PM