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File-backed Daf writer class.

Source: R/files_daf.R
FilesDaf.Rd

Concrete DafWriter subclass instantiated by files_daf() when opened for writing (modes "r+", "w", or "w+"). Use files_daf() to construct instances.

Usage

FilesDaf(
  name = character(0),
  internal = new.env(parent = emptyenv()),
  cache = new.env(parent = emptyenv()),
  axis_version_counter = new.env(parent = emptyenv()),
  vector_version_counter = new.env(parent = emptyenv()),
  matrix_version_counter = new.env(parent = emptyenv())
)

Arguments

name

Human-readable identifier for the Daf store.

internal

Internal per-store environment used by format backends to stash backend-specific state; reserved for package use.

cache

Three-tier cache environment (mapped / memory / query). See new_cache_env().

axis_version_counter

Environment tracking per-axis mutation counters; invalidates cached reads when an axis is modified.

vector_version_counter

Environment tracking per-vector mutation counters.

matrix_version_counter

Environment tracking per-matrix mutation counters.

Examples

if (FALSE) { # \dontrun{
d <- files_daf(tempfile("dafr-"), mode = "w")
inherits(d, "dafr::FilesDaf")
} # }