Call finalizer

This calls the currently assigned finalizer, either via R's finalization mechanism or manually.

finalize(x, ...)
# S3 method for class 'ff_pointer'
finalize(x, ...)
# S3 method for class 'ff'
finalize(x, ...)
# S3 method for class 'ffdf'
finalize(x, ...)

Arguments

x

either an ff or ffdf object or an ff_pointer, see details

...

currently ignored

Details

The finalize.ff_pointer method is called from R after it had been passed to reg.finalizer. It will set the finalizer name to NULL and call the finalizer.
The finalize generic can be called manually on ff or ffdf objects. It will call the finalizer but not touch the finalizer name.
For more details see finalizer

Note

finalize.ff_pointer MUST NEVER be called manually - neither directly nor by calling the generic on an ff_pointer (could erroneously signal that there is no pending finalization lurking around)

Value

returns whatever the called finalizer returns, for ffdf a list with the finalization returns of each physical component is returned.

Author

Jens Oehlschlägel

See also

finalizer

Examples

  x <- ff(1:12, pattern="./finalizerdemo")
  fnam <- filename(x)
  finalizer(x)
#> [1] "close"
  is.open(x)
#> [1] TRUE
  file.exists(fnam)
#> [1] TRUE

  finalize(x)
#> [1] TRUE

  finalizer(x)
#> [1] "close"
  is.open(x)
#> [1] FALSE
  file.exists(fnam)
#> [1] TRUE

  delete(x)
#> [1] TRUE
  finalizer(x)
#> [1] "close"
  is.open(x)
#> [1] FALSE
  file.exists(fnam)
#> [1] FALSE

  rm(x)
  gc()
#>           used (Mb) gc trigger  (Mb) max used  (Mb)
#> Ncells 1158834 61.9    1994352 106.6  1994352 106.6
#> Vcells 2157901 16.5    8790397  67.1  8790397  67.1