Class CronTrigger
- All Implemented Interfaces:
Trigger
,ZonedTrigger
Cron-based Trigger
implementation, which supports 5 or 6 fields
delimited by a single space character, plus a ZoneId
.
Basic cron syntax is supported. For more advanced scenarios, you can
subclass this implementation or combine multiple CronTrigger
instances in a Trigger
implementation of your own.
seconds (optional) | 0-59, *. When absent, 0 is assumed |
minutes | 0-59, * |
hours | 0-23, * |
dayOfMonth | 0-31, *, L |
month | 1-12, JAN-DEC, January-December, * |
dayOfWeek | SUN-SAT, Sunday-Saturday, 0-7, *.
0 and 7 both represent Sunday: 0 to designate the first day of the week,
and 7 for consistency with DayOfWeek . |
, |
delimits lists for all fields. For example, MON,WED,FRI or MAY,SEP |
- |
delimits ranges for all fields. For example, MON-FRI or 9-17 |
/ |
specifies a repeating increment for all fields except dayOfWeek.
For example, 6/7 for the hours field equates to 6,13,20 . |
# |
specifies an ordinal day of week. For example,
FRI#1,SAT#L is the first Friday and last Saturday of the month.
# cannot be used within ranges (- ) and increments (/ ). |
* |
indicates any value is permitted. |
L |
indicates the last day of the month.
2L indicates the second-to-last day, and so forth. |
0 * * * * |
every hour at the top of the hour |
0 9-17 * * MON-FRI |
weekdays from 9am to 5pm, at the top of each hour |
0 13/3 * MAY-SEP SAT,SUN |
weekends from May to September, every 3 hours, starting at 1pm |
30 10 * APR,AUG TUE#2,TUE#L |
second and last Tuesdays of April and August at 10:30am |
15 22 4 10,20,L * * |
4:22:15 AM on the 10th, 20th, and last day of every month |
0 8-11,13-16 2L JAN-MAR * |
8AM-11AM and 1PM-4PM on the second-to-last day of January, February, and March |
A constructor is provided that accepts a cron expression such as the above and a timezone id. For example,
trigger = new CronTrigger("0 7 * SEP-MAY MON-FRI", ZoneId.of("America/New_York"));
Another constructor allows cron fields to be specified in a fluent manner, in any order. For example,
trigger = new CronTrigger(ZoneId.of("America/Los_Angeles")) .months(Month.DECEMBER) .daysOfMonth(24) .hours(16, 18);
The getNextRunTime
method of this trigger
determines the next run time based on the cron schedule.
The skipRun
method always returns false
unless overridden by a subclass.
Methods of this class that configure the cron expression fields are not thread safe. It is the
responsibility of the caller to ensure that initialization of the CronTrigger
happens before it is supplied to a ManagedScheduledExecutorService
and that the
CronTrigger
is not subsequently modified.
You can subclass CronTrigger
to provide for more complex logic, such as in the following
example of combining two triggers to schedule twice-a-month payroll on the 15th and last day of month
or the prior Fridays when the former fall on a weekend:
public class PayrollTrigger extends CronTrigger { private final CronTrigger fridaysBeforeWeekendPayrollDay; PayrollTrigger() { // Every 15th and last day of the month that is a weekday, super("0 10 15,L * MON-FRI", ZoneId.of("America/Chicago")); // Every 13th, 14th, third-to-last, and second-to-last day of the month that is a Friday, fridaysBeforeWeekendPayrollDay = new CronTrigger( "0 10 13,14,3L,2L * FRI", getZoneId()); } public ZonedDateTime getNextRunTime(LastExecution lastExec, ZonedDateTime scheduledAt) { ZonedDateTime time1 = super.getNextRunTime(lastExec, scheduledAt); ZonedDateTime time2 = fridaysBeforeWeekendPayrollDay.getNextRunTime(lastExec, scheduledAt); return time1.isBefore(time2) ? time1 : time2; } }
- Since:
- 3.0
-
Constructor Summary
ConstructorDescriptionCronTrigger
(String cron, ZoneId zone) Constructor that accepts a cron expression.CronTrigger
(ZoneId zone) Constructor for the fluent configuration pattern. -
Method Summary
Modifier and TypeMethodDescriptiondaysOfMonth
(int... d) Configure the day-of-month cron field, overwriting any previous value for day-of-month.Configure the day-of-month cron field, overwriting any previous value for day-of-month.daysOfWeek
(String d) Configure the day-of-week cron field, overwriting any previous value for day-of-week.daysOfWeek
(DayOfWeek... d) Configure the day-of-week cron field, overwriting any previous value for day-of-week.getNextRunTime
(LastExecution lastExecutionInfo, ZonedDateTime taskScheduledTime) Using the cron schedule, and based on the end of the most recent execution (or absent that, the initial scheduling time), retrieve the next time that the task should run after.final ZoneId
Returns the timezone to use forZonedDateTime
that is supplied to thegetNextRunTime
andskipRun
methods.hours
(int... h) Configure the hours cron field, overwriting any previous value for hours.Configure the hours cron field, overwriting any previous value for hours.minutes
(int... m) Configure the minutes cron field, overwriting any previous value for minutes.Configure the minutes cron field, overwriting any previous value for minutes.Configure the months cron field, overwriting any previous value for months.Configure the month cron field, overwriting any previous value for month.protected ZonedDateTime
next
(ZonedDateTime from) Advance to the next date/time according to the cron schedule.seconds
(int... s) Configure the seconds cron field, overwriting any previous value for seconds.Configure the seconds cron field, overwriting any previous value for seconds.toString()
Readable representation of the CronTrigger, which displays fields in list form or with the * character for brevity.Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
Methods inherited from interface jakarta.enterprise.concurrent.ZonedTrigger
getNextRunTime, skipRun, skipRun
-
Constructor Details
-
CronTrigger
Constructor that accepts a cron expression.- Parameters:
cron
- cron expression.zone
- timezone ID to use forZonedDateTime
that is supplied togetNextRunTime
andskipRun
methods. Null indicates to use the system default.
-
CronTrigger
Constructor for the fluent configuration pattern. Seconds, minutes, and hours default to 0. The remaining fields default to *.- Parameters:
zone
- timezone ID to use forZonedDateTime
that is supplied togetNextRunTime
andskipRun
methods. Null indicates to use the system default.
-
-
Method Details
-
getNextRunTime
public ZonedDateTime getNextRunTime(LastExecution lastExecutionInfo, ZonedDateTime taskScheduledTime) Using the cron schedule, and based on the end of the most recent execution (or absent that, the initial scheduling time), retrieve the next time that the task should run after.- Specified by:
getNextRunTime
in interfaceZonedTrigger
- Parameters:
lastExecutionInfo
- information about the last execution of the task. This value will be null if the task has not yet run.taskScheduledTime
- the date/time at which theManagedScheduledExecutorService.schedule
method was invoked to schedule the task.- Returns:
- the date/time after which the next execution of the task should start.
- Throws:
DateTimeException
- if a next time cannot be determined from the cron expression.
-
getZoneId
Returns the timezone to use forZonedDateTime
that is supplied to thegetNextRunTime
andskipRun
methods.- Specified by:
getZoneId
in interfaceZonedTrigger
- Returns:
- timezone to use for operations on this trigger.
-
daysOfMonth
Configure the day-of-month cron field, overwriting any previous value for day-of-month.- Parameters:
d
- one or more day numbers ranging from 1 to 31.- Returns:
- this instance.
-
daysOfMonth
Configure the day-of-month cron field, overwriting any previous value for day-of-month.- Parameters:
d
- dayOfMonth cron field. For example,15,L
.- Returns:
- this instance.
-
daysOfWeek
Configure the day-of-week cron field, overwriting any previous value for day-of-week.- Parameters:
d
- one or more days of the week.- Returns:
- this instance.
-
daysOfWeek
Configure the day-of-week cron field, overwriting any previous value for day-of-week.- Parameters:
d
- dayOfWeek cron field. For example,MON-FRI,SAT#L
.- Returns:
- this instance.
-
hours
Configure the hours cron field, overwriting any previous value for hours.- Parameters:
h
- one or more hour values ranging from 0 to 23.- Returns:
- this instance.
-
hours
Configure the hours cron field, overwriting any previous value for hours.- Parameters:
h
- hours cron field. For example,9-17
for 9am to 5pm.- Returns:
- this instance.
-
minutes
Configure the minutes cron field, overwriting any previous value for minutes.- Parameters:
m
- one or more minute values ranging from 0 to 59.- Returns:
- this instance.
-
minutes
Configure the minutes cron field, overwriting any previous value for minutes.- Parameters:
m
- minutes cron field. For example,5/10
for 10 minute intervals starting at 5 minutes after the hour (:05, :15, :25, :35, :45, :55).- Returns:
- this instance.
-
months
Configure the month cron field, overwriting any previous value for month.- Parameters:
m
- one or more months.- Returns:
- this instance.
-
months
Configure the months cron field, overwriting any previous value for months.- Parameters:
m
- months cron field. For example,SEP-NOV,FEB-MAY
.- Returns:
- this instance.
-
seconds
Configure the seconds cron field, overwriting any previous value for seconds.- Parameters:
s
- one or more seconds values ranging from 0 to 59.- Returns:
- this instance.
-
seconds
Configure the seconds cron field, overwriting any previous value for seconds.- Parameters:
s
- seconds cron field. For example,30
.- Returns:
- this instance.
-
toString
Readable representation of the CronTrigger, which displays fields in list form or with the * character for brevity.For example,
CronTrigger@89abcdef seconds 0, minutes 0, hours 9, *, months 3,6,9,12, SAT#2,SAT#4
-
next
Advance to the next date/time according to the cron schedule.- Parameters:
from
- the date/time from which to compute the next time.- Returns:
- next date/time according to the cron schedule, or the original time if it matches.
-