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source("incl/start.R")
message("progress_aggregator() ...")
with_progress({
progress <- progressor(steps = 1 + 3 + 10 + 1)
relay_progress <- progress_aggregator(progress)
progress()
relay_progress(slow_sum(1:3))
relay_progress(slow_sum(1:10))
progress()
})
message("- Stray progressions from unknown sources")
slow_prod <- function(x, delay = getOption("progressr.demo.delay", 0.05)) {
progress <- progressor(2*length(x))
res <- 0
for (kk in seq_along(x)) {
progress(message = sprintf("Multiplying %g", kk))
Sys.sleep(0.8*delay)
res <- res * x[kk]
progress(message = "...")
Sys.sleep(0.2*delay)
}
res
}
## This will only show progress for the *first* of the three
## functions that report progress. Any progression updates from
## the second and third will be ignored, because they are from
## a different source
with_progress({
x <- 1:10
a <- slow_sum(x)
b <- slow_prod(x)
c <- slow_sum(-x)
})
## To get progression from all of them, we need to know how many
## steps they report on and then use a gather-and-relay handler
with_progress({
x <- 1:10
progress <- progressor(3*length(x))
relay_progress <- progress_aggregator(progress)
relay_progress({
a <- slow_sum(x)
b <- slow_prod(x)
c <- slow_sum(-x)
})
})
message("progress_aggregator() ... done")
source("incl/end.R")
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