cache_filesystem2: Filesystem Cache with last access timestamp recorded for each...

In coolbutuseless/memoisetools: Additional Caches and Helper Functions for the Memoise Package

Description

Use a cache on the local filesystem that will persist between R sessions.

Usage

cache_filesystem2(path = tempdir(), algo = "xxhash64",
  compress = TRUE)

Arguments

path	Directory in which to store cached items.
algo	The hashing algorithm used for the cache, see digest for available algorithms.
compress	option passed to saveRDS i.e. TRUE, FALSE, 'gzip', 'bzip2', 'xz', default: FALSE.

Details

This function differs from memoise::cache_filesystem in a number of ways:

• use a tempdir if none specified

• absolute path Full absolute path to cache is stored, even if initialised with a relative path

• compression By default objects are compressed using gzip compression. See the compress argument

• timestamping Each get/set to the cache is timestamped so that the last access time for every cached object is known

• expiry The addition of timestamps allows for expiring objects older than a certain age. See the function memoisetools::expire_cache

• faster key lookup the has_key method now uses the timestamp cache to determine if a given key exists or not. This makes it faster to check if a key exists, but will cause an error if they file doesn't actually exist on the filesystem (e.g. if you've deleted the file manually)

coolbutuseless/memoisetools documentation built on May 31, 2019, 12:45 a.m.