Allow CronTrigger to resume from specified timestamp [SPR-14909]

[spring-projects-issues]

Jean-Philippe Legault opened SPR-14909 and commented

Allowing ReschedulingRunnable to receive a TriggerContext on creation (instead of always creating a new one) and updating the TaskScheduler interface to add a new signature "ScheduledFuture<?> schedule(Runnable task, Trigger trigger, TriggerContext initialContext);" would allow me to resume a task that was created with a Trigger trough the TaskScheduler.

The current behavior is that a job scheduled with the TaskScheduler with the CronTrigger "0 0 0 */2 * *" task will run in 2 days from now, no matter what. Updating this would allow me to resume a task.

As an example, if I have the CronTrigger "0 0 0 */2 * *", and I know that the last time this task ran was yesterday, I could setup an initial TriggerContext to be passed along the TaskScheduler and used at the creation of the first ReschedulingRunnable instead of using a new one. The following ReschedulingRunnable that will be created would use the current Context, which mean the behavior would not change after the first pass.

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Issue Links:

• Add ListenableScheduledFuture support to TaskScheduler [SPR-13407] #17987 Add ListenableScheduledFuture support to TaskScheduler

[jhoeller]

I'm introducing static factory methods on CronTrigger with support for a resumptionTimestamp, coming with traditional semantics as resumeLenientExecution method (calculating the first trigger firing from the given timestamp but every subsequent firing on the previous completion time) and also with fixed-execution semantics as resumeFixedExecution (not missing any original trigger firing even on resumption, calculating subsequent firings from the previous scheduled time).