targets (version 0.7.0)

tar_process: Get main process info.

Description

Get info on the most recent main R process to orchestrate the targets of the current project.

Usage

tar_process(names = NULL, store = targets::tar_config_get("store"))

Arguments

names

Optional, names of the data points to return. If supplied, tar_process() returns only the rows of the names you select. You can supply symbols or tidyselect helpers like all_of() and starts_with(). If NULL, all names are selected.

store

Character of length 1, path to the targets data store. Defaults to tar_config_get("store"), which in turn defaults to _targets/. When you set this argument, the value of tar_config_get("store") is temporarily changed for the current function call. See tar_config_get() and tar_config_set() for details about how to set the data store path persistently for a project.

Value

A data frame with metadata on the most recent main R process to orchestrate the targets of the current project. The output includes the pid of the main process.

Details

The main process is the R process invoked by tar_make() or similar. If callr_function is not NULL, this is an external process, and the pid in the return value will not agree with Sys.getpid() in your current interactive session. The process may or may not be alive. You may want to check the status with tar_pid() %in% ps::ps_pids() before running another call to tar_make() for the same project.

See Also

Other data: tar_load_raw(), tar_load(), tar_meta(), tar_objects(), tar_pid(), tar_read_raw(), tar_read()

Examples

# NOT RUN {
if (identical(Sys.getenv("TAR_EXAMPLES"), "true")) {
tar_dir({ # tar_dir() runs code from a temporary directory.
tar_script({
  list(
    tar_target(x, seq_len(2)),
    tar_target(y, 2 * x, pattern = map(x))
  )
}, ask = FALSE)
tar_make()
tar_process()
tar_process(pid)
})
}
# }