Connectors
Schedule Connectors Using Cron Expressions
As an alternative to specifying a simple interval on the Schedule tab, you can schedule Connectors using sophisticated Cron expressions. To specify a Cron expression, complete the Schedule tab by entering a proper Cron expression in the provided field and select the Use Cron Expression checkbox to confirm the choice. Web Central uses Quartz Cron implementation.
When the schedule is saved, the Cron Expression provided is validated by the server to ensure the definition is a valid Cron expression.
Note that an invalid expression can prevent the server from starting. There is no guarantee that the validation check will catch every invalid expression.
Cron Expressions
There are several special predefined values which can be used to substitute the CRON expression.
| Entry | Description | Equivalent To |
|---|---|---|
|
@yearly (or @annually) |
Run once a year, midnight, Jan. 1st |
0 0 12 1 1 ? * |
|
@monthly |
Run once a month, midnight, first of month |
0 0 1 * * |
|
@weekly |
Run once a week, midnight on Sunday |
0 0 * * 0 |
|
@daily |
Run once a day, midnight |
0 0 * * * |
|
@hourly |
Run once an hour, beginning of hour |
0 * * * * |
|
@reboot |
Run at startup |
@reboot |
* * * * * *
┬ ┬ ┬ ┬ ┬ ┬
│ │ │ │ │ │
│ │ │ │ │ │
│ │ │ │ │ └───── day of week (0 - 6) (0 is Sunday, or use names)
│ │ │ │ └────────── month (1 - 12)
│ │ │ └─────────────── day of month (1 - 31)
│ │ └──────────────────── hour (0 - 23)
│ └───────────────────────── minutes (0 - 59)
└────────────────────────────── seconds (0 - 59)
For Cron expression configuration. see: