Time-based observers observe time-based events based on the internal timer of the complex event processing engine.
Two observers, TIMER:INTERVAL and TIMER:AT, are available.
Observer | Syntax | Explanation |
|---|---|---|
TIMER:INTERVAL | timer:interval(timeExpression) | Waits the specified time. In the timeExpression, specify either a time representation or an expression providing the number of seconds. |
TIMER:AT | timer:at(minuteSpecification, hourSpecification, daySpecification, monthSpecification, dayOfWeekSpecification [,secondsSpecification]) | Has a function like the Unix crontab command. The expression becomes TRUE at the specified time. An asterisk (*) can be specified as a wild card in each specification. A range can be specified by using a colon (:) to tie together a lower limit and an upper limit. The division expression */x indicates that the value is enabled after every x. Specifications in accordance with combinations are possible by enclosing specifications in square brackets, "[" and "]", and by comma (,) separation. |
The table below shows the values that can be specified for each TIMER:AT specification.
Specification location | Specifiable value | Specifiable keyword |
|---|---|---|
minuteSpecification | 0-59 | |
hourSpecification | 0-23 | |
daySpecification | 1-31 | last: Indicates the last day of the target month. weekday: Indicates the nearest working day (Monday to Friday) to the specified date. lastweekday: Indicates the last working day of the target month. |
monthSpecification | 1-12 | |
dayOfWeekSpecification | 0 (Sunday) - 6 (Saturday) | last: If only this specification is used, this simply indicates Saturday. If last is used together with a numeric indicating a day of the week, indicates the last occurrence of that day of the week in the target month. |
secondsSpecification (optional) | 0-59 |
