Plugin: Scheduler

Timers and scheduled jobs

Scheduled Jobs

A scheduled job triggers periodically using a cron expression.

Cron Expression

Comma separated values such as 5,8,10 represent more than one time value. So for example, a schedule of 0 2,14,26 * * * * would execute on the 2nd, 14th, and 26th minute of every hour.

Ranges can be specified with a dash. A schedule of 0 0 * 5-10 * * would execute once per hour but only on day 5 through 10 of the month.

Day of the week can be specified as an abbreviation or the full name. A schedule of 0 0 6 * * Sun,Sat would execute at 6am on Sunday and Saturday.

Note that the year may be omitted.

Examples

Cron Expression	sec	min	hour	day of month	month	day of week	year	Description
`* * * * * * *`	*	*	*	*	*	*	*	Runs every second
`0 2,14,26 * * * *`	0	2,14,26	*	*	*	*		Run once per hour but only on day 5 through 10 of the month
`0 0 * 5-10 * *`	0	0	*	5-10	*	*		Run at 6am on Sunday and Saturday

Timers

A timer triggers after a given duration. The duration can be specified either as a number in milliseconds or as a string in ISO 8601 Duration Format.

Durations define the amount of intervening time in a time interval and are represented by the format P[n]Y[n]M[n]DT[n]H[n]M[n]S or P[n]W. In these representations, the [n] is replaced by the value for each of the date and time elements that follow the [n]. Leading zeros are not required, but the maximum number of digits for each element should be agreed to by the communicating parties. The capital letters P, Y, M, W, D, T, H, M, and S are designators for each of the date and time elements and are not replaced.

https://en.wikipedia.org/wiki/ISO_8601#Durations

Designators

Designator	Description
`P`	`P` is the duration designator (for period) placed at the start of the duration representation.
`Y`	`Y` is the year designator that follows the value for the number of years.
`M`	`M` is the month designator that follows the value for the number of months.
`W`	`W` is the week designator that follows the value for the number of weeks.
`D`	`D` is the day designator that follows the value for the number of days.
`T`	`T` is the time designator that precedes the time components of the representation.
`H`	`H` is the hour designator that follows the value for the number of hours.
`M`	`M` is the minute designator that follows the value for the number of minutes.
`S`	`S` is the second designator that follows the value for the number of seconds.

Examples

Duration	Description
`PT10S`	Represents a duration of ten seconds.
`PT1M30S`	Represents a duration of one minute and thirty seconds.
`PT1H`	Represents a duration of one hour.
`P1DT12H`	Represents a duration of one day and twelve hours.
`P3Y6M4DT12H30M5S`	Represents a duration of three years, six months, four days, twelve hours, thirty minutes, and five seconds.

Entity Types

Name	Component	Property	Data Type	Socket Type	Description

scheduled_job		schedule	string	input	Cron Expression
	generator	trigger	bool	output

timer		duration	number or string	input	Duration in milliseconds or as ISO8601 Duration Format
	generator	trigger	bool	output

Platform Compatibility

Platform	Compatibility
Linux	✓
MacOS	✓
Windows	✓

Repositories

Name	Repository
reactive-graph-plugin-scheduler	https://github.com/reactive-graph/plugins-core/tree/main/plugins/scheduler
tokio-cron-scheduler	https://github.com/mvniekerk/tokio-cron-scheduler
cron expression parser	https://github.com/zslayton/cron
ISO8601 duration parser	https://github.com/PoiScript/iso8601-duration

Usage

GraphQL: Create a new timer

mutation {
  instances {
    entities {
      create(
        type: "timer",
        id: "46e2ecd0-3e91-4205-99c9-d9543923a73a",
        properties: [
          {
            name: "duration",
            value: 1000
          }
        ]
      ) {
        id
        type {
          name
        }
        properties(
          names: [
            "duration",
            "trigger"
          ]
        ) {
          name
          value
        }
      }
    }
  }
}

GraphQL: Update duration of an existing timer

mutation {
  instances {
    entities {
      update(
        id: "46e2ecd0-3e91-4205-99c9-d9543923a73a",
        properties: [
          {
            name: "duration",
            value: 1500
          }
        ]
      ) {
        id
        type {
          name
        }
        properties(
          names: [
            "duration",
            "trigger"
          ]
        ) {
          name
          value
        }
      }
    }
  }
}

Reactive Graph