shinyCache is a small R package that implements basic, yet fast caching for Shiny applications. This functionality is especially useful when building Shiny applications that fetch data that wont usually change during a single session. It is also useful when working with semi-long computations that could be repeated multiple times (such as returning to an initial state).
Inside the Shiny app, create a reactiveValues object to serve as the cache. Use the function cache_call to compute, fetch data externally or retrieve data from the cache. Each item in the cache is unique identified by a hash number created from the parameters cache_params, cache_depends and prefix. See ?cache_call for more information.
cache <- reactiveValues()
output$table <- renderDataTable({
cache_call(
fn = long_computation,
cache = cache,
cache_params = list(arg1 = user_input),
non_cache_params = list(data = mtcars),
prefix = "table"
)