Schedule (Tapestry API - 5.7.2)乐学网一站式学习平台

All Known Implementing Classes:

CronSchedule, IntervalSchedule
```
public interface Schedule
```
Used with PeriodicExecutor to control the schedule for when jobs execute.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`long`	`firstExecution()`	For a newly created job, what is the start time for the job.
`long`	`nextExecution(long previousExecution)`	Computes the next execution time for a job.

- Method Detail
  - firstExecution
```
long firstExecution()
```
    For a newly created job, what is the start time for the job. Often, the current clock time is returned, to start a job as soon as possible.
    
    Returns:
    
    start time for new job, in system clock millis
  - nextExecution
```
long nextExecution(long previousExecution)
```
    Computes the next execution time for a job.
    
    Parameters:
    
    previousExecution - time of previous execution (in system clock millis)
    
    Returns:
    
    time of next execution (in system clock millis) or a value <= 0 to cancel the job's execution