## Used in the Pool class. This function builds on top of `scheduleTask`
## to schedule recurring tasks. It uses the same mechanics: the return
## value is a function that cancels the scheduling of future tasks.
scheduleTaskRecurring <- function(func, delay) {
force(func)
cancelled <- FALSE
func2 <- function() {
func()
if (!cancelled)
handle <<- later::later(func2, delay)
}
handle <- later::later(func2, delay)
function() {
cancelled <<- TRUE
handle()
}
}
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