tests/globals,tricky.R

In HenrikBengtsson/future.BatchJobs: A Future API for Parallel and Distributed Processing using BatchJobs

source("incl/start.R")
library("listenv")

plan(batchjobs_local)

## CRAN processing times:
## On Windows 32-bit, don't run these tests
if (!fullTest && isWin32) plan(sequential)

message("*** Tricky use cases related to globals ...")

message("- Globals with the same name as 'base' objects ...")

## 'col' is masked by 'base::col' (Issue #55)

col <- 3
x %<-% { stopifnot(is.numeric(col)); col }
print(x)
stopifnot(x == col)


message("- Globals that needs to be encoded ...")
.a <- 42L
x %<-% { .a }
print(x)
stopifnot(x == .a)

`$foo` <- 42L
x %<-% { `$foo` }
print(x)
stopifnot(x == `$foo`)


## 'col' is masked by 'base::col' (Issue #55)

col <- 3
x %<-% { stopifnot(is.numeric(col)); col }
stopifnot(x == col)


message("- flapply(x, FUN=base::vector, ...) ...")

flapply <- function(x, FUN, ...) {
  res <- listenv()
  for (ii in seq_along(x)) {
    res[[ii]] %<-% FUN(x[[ii]], ...)
  }
  names(res) <- names(x)

  ## Make sure 'x', 'FUN' and 'ii' are truly
  ## exported to the future environment
  rm(list=c("x", "FUN", "ii"))

  as.list(res)
}

x <- list(a="integer", c="character", c="list")
str(list(x=x))

y0 <- lapply(x, FUN=base::vector, length=2L)
str(list(y0=y0))

y <- flapply(x, FUN=base::vector, length=2L)
str(list(y=y))
stopifnot(identical(y, y0))


message("- flapply(x, FUN=future:::hpaste, ...) ...")

x <- list(a=c("hello", b=1:100))
str(list(x=x))

y0 <- lapply(x, FUN=future:::hpaste, collapse="; ", maxHead=3L)
str(list(y0=y0))

y <- flapply(x, FUN=future:::hpaste, collapse="; ", maxHead=3L)
str(list(y=y))
stopifnot(identical(y, y0))


message("- flapply(x, FUN=listenv::listenv, ...) ...")

x <- list()

y <- listenv()
y$B <- c("hello", b=1:100)
x$b <- y

print(x)

y0 <- lapply(x, FUN=listenv::map)
str(list(y0=y0))

y <- flapply(x, FUN=listenv::map)
str(list(y=y))
stopifnot(identical(y, y0))


message("*** Tricky use cases related to globals ... DONE")

source("incl/end.R")