Using RcppMsgPack

RcppMsgPack

Convert to and from msgpack objects in R using the official msgpack-c API through Rcpp.

flowchart A flowchart describing the conversion of R objects into msgpack objects and back.

Msgpack EXT types are converted to raw vectors with EXT attributes containing the extension type. The extension type must be an integer from 0 to 127.

Maps are converted to data.frames with additional class “map”. Map objects in R contain key and value list columns and can be simplified to named lists or named vectors. The helper function msgpack_map creates map objects that can be serialized into msgpack.

For more information on msgpack types, see here.

Installation:

  1. On Windows, install Rtools (https://cran.r-project.org/bin/windows/Rtools/)
  2. In R, install devtools: install.packages("devtools")
  3. library(devtools)
  4. install_github("traversc/msgpack2R")

Example:

See tests/tests.r for more examples.

library(RcppMsgPack)
library(microbenchmark)

x <- as.list(1:1e6)
microbenchmark(xpk <- msgpack_pack(x), times=3)
## Unit: milliseconds
##                    expr      min       lq     mean   median       uq
##  xpk <- msgpack_pack(x) 96.96307 100.0263 103.2186 103.0895 106.3463
##       max neval
##  109.6031     3
microbenchmark(xu <- msgpack_unpack(xpk), times=3)
## Unit: milliseconds
##                       expr      min       lq     mean   median       uq
##  xu <- msgpack_unpack(xpk) 789.1947 808.5951 844.7374 827.9954 872.5087
##       max neval
##  917.0219     3