Delay async computation for the specified time

Since R is single-threaded, the deferred value might be resolved (much) later than the specified time period.

delay(delay)

Arguments

delay

Time interval in seconds, the amount of time to delay to delay the execution. It can be a fraction of a second.

Value

A deferred object.

Examples

# \donttest{
## Two HEAD requests with 1/2 sec delay between them
resp <- list()
afun <- async(function() {
  http_head("https://eu.httpbin.org?q=2")$
    then(function(value) resp[[1]] <<- value$status_code)$
    then(function(...) delay(1/2))$
    then(function(...) http_head("https://eu.httpbin.org?q=2"))$
    then(function(value) resp[[2]] <<- value$status_code)
})
synchronise(afun())
#> [1] 200
resp
#> [[1]]
#> [1] 200
#> 
#> [[2]]
#> [1] 200
#> 
# }