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Zarr-backed Daf class.

Source: R/zarr_format.R
ZarrDaf.Rd

Concrete DafWriter subclass instantiated by zarr_daf() when opened with mode "w" / "w+" / "r+". Operates against any ZarrStore; supported backends today: DirStore (filesystem), DictStore (in-memory), MmapZipStore (zip archive).

Usage

ZarrDaf(
  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()),
  store = ZarrStore()
)

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.

store

Internal ZarrStore instance (set by zarr_daf()); not intended for direct use.

Examples

tmp <- tempfile(fileext = ".daf.zarr")
d <- zarr_daf(tmp, mode = "w")
add_axis(d, "cell", c("c1", "c2"))