Abstract read-only reader class.

Usage

DafReadOnly(
  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

d <- memory_daf()
ro <- read_only(d)
inherits(ro, "dafr::DafReadOnly")
#> [1] TRUE