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Ownership of simulation files

Source: R/own.R
ownership.Rd

Functions to check ownership or disown simulation output files on disk.

One situation where you need to take over ownership is when you are simulating in parallel, and the simulation happens in another R process. mrgsim.ds ownership is established when the simulation returns and the mrgsimsds object is created. When this happens in another R process (e.g., on a worker node), there is no way to transfer that information back to the parent process. In that case, a call to take_ownership() once the results are returned to the parent process would be appropriate. Typically, these results are returned as a list and a call to reduce_ds() will create a single object pointing to and owning multiple files. Therefore, it should be rare to call take_ownership() directly; if doing so, please make sure you understand what is going on.

Usage

ownership()

list_ownership(full.names = FALSE)

check_ownership(x)

disown(x)

take_ownership(x)

Arguments

full.names

if TRUE, include the directory path when listing file ownership.

x

an mrgsimsds object.

Value

  • check_ownership: TRUE if x owns the underlying files; FALSE otherwise.

  • list_ownership: a data.frame of ownership information.

  • ownership: nothing; used for side effects.

  • disown: x is returned invisibly; it is not modified.

  • take_ownership: x is returned invisibly after its hash and the package-level ownership maps are updated in place.

See also

reduce_ds(), copy_ds().

Examples

mod <- house_ds()

out <- mrgsim_ds(mod, id = 1)

check_ownership(out)
#> [1] TRUE

ownership()
#> > Objects: 5 | Files: 5 | Size: 385.7 Kb

list_ownership()
#>                              file        address
#> 1 mrgsims-ds-19173e2de442.parquet 0x55ad63cb1060
#> 2 mrgsims-ds-19174e9d507b.parquet 0x55ad640ff968
#> 3  mrgsims-ds-19177aa7a80.parquet 0x55ad63eb2df8
#> 4 mrgsims-ds-1917424a1f3a.parquet 0x55ad58617c88
#> 5  mrgsims-ds-1917c09c419.parquet 0x55ad634ebe70

e1 <- ev(amt = 100)
e2 <- ev(amt = 200)

out <- list(mrgsim_ds(mod, e1), mrgsim_ds(mod, e2))

sims <- reduce_ds(out)

ownership()
#> > Objects: 6 | Files: 7 | Size: 439 Kb

check_ownership(sims)
#> [1] TRUE

check_ownership(out[[1]])
#> [1] FALSE

check_ownership(out[[2]])
#> [1] FALSE