deferred class PERIODIC_JOB

Features exported to LOOP_ITEM

Pseudo periodic job. The timing is not exact : the time between two execution may be longer than the given period depending on time needed to execute ready tasks. There is no try to recover the time lost each time.

Direct parents

conformant parents

JOB

Known children

conformant children

REPEAT_JOB, SIMPLE_PERIODIC_JOB, TEXT_CURSOR_JOB

Summary

exported features

Details

period: REAL

unit is seconds

next_time: MICROSECOND_TIME
prepare (ready: READY_DESCRIPTION)

use ready to descibe condition that make this job ready to continue.

require

  • ready /= Void
  • not ready.queryable

is_ready (ready: READY_DESCRIPTION): BOOLEAN

check if this job is ready to continue his work

require

  • ready /= Void
  • ready.queryable

priority: INTEGER

Never change priority after job inserted in loop_item. Priority should only be set at creation time.

deferred continue

Continue to do the job The work to do has to be small work and non blocking, it will continue on next call

deferred done: BOOLEAN

done returns True when the job is finished. Then the job may be restart(ed) if it need to run again.

deferred restart

Configure the job like the initial state. Example: when some window dialog appears second time, all jobs from this window are restarted.

require

  • done

ensure

  • not done

< (other: JOB): BOOLEAN

Class invariant