Use a stash through the cachem interface

Returns an object with the methods of a cachem cache — get(), set(), exists(), remove(), reset(), keys(), prune(), size() and info() — so code written for cachem, such as memoise::memoise() and Shiny's bindCache(), can store in a stash. Keys follow cachem's rule, lower-case letters, digits, _ and -, and are stored under prefix.

Usage

as_cachem(stash, ..., prefix = "cachem/", expire = NULL, codec = NULL)

Arguments

stash: A stash, from stash().
...: Must be empty.
prefix: Where in the stash the keys live.
expire, codec: Passed to stash_set() on every set().

Value

A list of functions with class c("dastash_cachem", "cachem").

Examples

s <- local_stash()
cache <- as_cachem(s)
#> Error in as_cachem(s): This stash has been closed.
cache$set("answer", 42)
#> Error: object 'cache' not found
cache$get("answer")
#> Error: object 'cache' not found
cache$keys()
#> Error: object 'cache' not found

slow_double <- function(x) x * 2
fast_double <- memoise::memoise(slow_double, cache = cache)
#> Error: object 'cache' not found
fast_double(21)
#> Error in fast_double(21): could not find function "fast_double"