kirillseva / cacher

In memory cache interface for R

cacher

In memory caches for R. Currently implements LRU cache with size parameter.

Create a cache...

cache <- LRUcache("150mb")  # cache with 150mb of size
cache2 <- LRUcache("1GB")   # cache with 1GB of size
cache3 <- LRUcache(3)       # cache that can hold three items of any size (that fits in RAM)

Then use it...

cache3$set("key", "this is your value")  # set a value at a particular key...
cache3$get("key")                        # ...and get that value back!
[1] "this is your value"

cache3$peek("key")                       # doesn't alter the key's timestamp
[1] "this is your value"

cache3$exists("key")                     # ...see if your key exists
[1] TRUE

cache3$set("key2", "hi")                 # but if you go over your size...
cache3$set("key3", "hello")
cache3$set("key4", "yo")
cache3$exists("key")                     # ...the oldest key will automatically go away.
[1] FALSE                                # oldness is determined on when the key was most
                                         # recently accessed, not when it was set.

cache3$exists("key4")
[1] TRUE
cache3$forget("key4")                    # you can also explicitly forget a certain key.
cache3$exists("key4")
[1] FALSE

Installation

Install with devtools.

install.packages("devtools")
library(devtools)
install_github("kirillseva/cacher")

cacher's Issues

Installation Error

Trying to install this, and I get the error:

"Error : package 'cacher' is not installed for 'arch = i386'
Error: loading failed"

Can you clarify what this means?

Define operators

Define [ etc operators

Can you document how to use this package?

New caches still have access to old data

cache <- cacher::LRUcache("1000B")
cache$set("test", "test value")
cache$exists("test")
[1] TRUE
cache$get("test")
[1] "test value"

new_cache <- cacher::LRUcache("1000B")
# Without setting anything, it exists in the new cache
new_cache$exists("test")
[1] TRUE
new_cache$get("test")
[1] "test value"

# It even still exists in a new cache where it is too large to actually be stored there.
tiny_cache <- cacher::LRUcache("1B")
tiny_cache$get("test")
[1] "test value"
tiny_cache$set("test", "test")
Warning message:
'test' is too large (96B) to fit in the cache (1B) and will not be cached. Consider creating a larger cache.

MIT License

Hello

Was wondering if we could get an MIT License added to this Repo. Avant is looking to fork this repo and we'd like to have this added before doing so.