Class CronExpression
- java.lang.Object
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- org.redisson.executor.CronExpression
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public class CronExpression extends Object
This provides cron support for java8 using java-time.Parser for unix-like cron expressions: Cron expressions allow specifying combinations of criteria for time such as: "Each Monday-Friday at 08:00" or "Every last friday of the month at 01:30"
A cron expressions consists of 5 or 6 mandatory fields (seconds may be omitted) separated by space.
These are:Field Allowable values Special Characters Seconds (may be omitted)
0-59
, - * /
Minutes
0-59
, - * /
Hours
0-23
, - * /
Day of month
1-31
, - * ? / L W
Month
1-12 or JAN-DEC (note: english abbreviations)
, - * /
Day of week
1-7 or MON-SUN (note: english abbreviations)
, - * ? / L #
'*' Can be used in all fields and means 'for all values'. E.g. "*" in minutes, means 'for all minutes'
'?' Can be used in Day-of-month and Day-of-week fields. Used to signify 'no special value'. It is used when one want to specify something for one of those two fields, but not the other.
'-' Used to specify a time interval. E.g. "10-12" in Hours field means 'for hours 10, 11 and 12'
',' Used to specify multiple values for a field. E.g. "MON,WED,FRI" in Day-of-week field means "for monday, wednesday and friday"
'/' Used to specify increments. E.g. "0/15" in Seconds field means "for seconds 0, 15, 30, ad 45". And "5/15" in seconds field means "for seconds 5, 20, 35, and 50". If '*' s specified before '/' it is the same as saying it starts at 0. For every field there's a list of values that can be turned on or off. For Seconds and Minutes these range from 0-59. For Hours from 0 to 23, For Day-of-month it's 1 to 31, For Months 1 to 12. "/" character helsp turn some of these values back on. Thus "7/6" in Months field specify just Month 7. It doesn't turn on every 6 month following, since cron fields never roll over
'L' Can be used on Day-of-month and Day-of-week fields. It signifies last day of the set of allowed values. In Day-of-month field it's the last day of the month (e.g.. 31 jan, 28 feb (29 in leap years), 31 march, etc.). In Day-of-week field it's Sunday. If there's a prefix, this will be subtracted (5L in Day-of-month means 5 days before last day of Month: 26 jan, 23 feb, etc.)
'W' Can be specified in Day-of-Month field. It specifies closest weekday (monday-friday). Holidays are not accounted for. "15W" in Day-of-Month field means 'closest weekday to 15 i in given month'. If the 15th is a Saturday, it gives Friday. If 15th is a Sunday, the it gives following Monday.
'#' Can be used in Day-of-Week field. For example: "5#3" means 'third friday in month' (day 5 = friday, #3 - the third). If the day does not exist (e.g. "5#5" - 5th friday of month) and there aren't 5 fridays in the month, then it won't match until the next month with 5 fridays.
Case-sensitive No fields are case-sensitive
Dependencies between fields Fields are always evaluated independently, but the expression doesn't match until the constraints of each field are met. Overlap of intervals are not allowed. That is: for Day-of-week field "FRI-MON" is invalid,but "FRI-SUN,MON" is valid
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Constructor Summary
Constructors Constructor Description CronExpression(String expr)
CronExpression(String expr, boolean withSeconds)
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Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description static CronExpression
create(String expr)
static CronExpression
createWithoutSeconds(String expr)
String
getExpr()
LocalDateTime
nextLocalDateTimeAfter(LocalDateTime dateTime)
ZonedDateTime
nextTimeAfter(ZonedDateTime afterTime)
ZonedDateTime
nextTimeAfter(ZonedDateTime afterTime, long durationInMillis)
ZonedDateTime
nextTimeAfter(ZonedDateTime afterTime, ZonedDateTime dateTimeBarrier)
String
toString()
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Method Detail
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create
public static CronExpression create(String expr)
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createWithoutSeconds
public static CronExpression createWithoutSeconds(String expr)
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nextTimeAfter
public ZonedDateTime nextTimeAfter(ZonedDateTime afterTime)
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nextLocalDateTimeAfter
public LocalDateTime nextLocalDateTimeAfter(LocalDateTime dateTime)
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nextTimeAfter
public ZonedDateTime nextTimeAfter(ZonedDateTime afterTime, long durationInMillis)
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nextTimeAfter
public ZonedDateTime nextTimeAfter(ZonedDateTime afterTime, ZonedDateTime dateTimeBarrier)
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getExpr
public String getExpr()
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