Global reactivePoll data on RStudio Connect caching

[ismirsehregal]

An old topic (stumbled across this via google) but anyway:

@cole - it's absolutely possible to use a "global" reactivePoll outside of the server function. This is done to share data across sessions and it is still "firing".

The same goes for reactiveFileReader, reactiveVal and reactiveValues.

Looking at ?reactiveFileReader there even is an example available for the global use case.

Please check my related question here:

Cross-session / global reactive / reactivePoll

I was hoping to create a cross-session reactivePoll which provides all shiny sessions with the same (expensive) DB query result by setting it's session argument to NULL. The example "Cross-session reactive file reader" given in ?reactiveFileReader mentions: In this example, all sessions share the same reader, so read.csv only gets executed once no matter how many user sessions are connected. reactiveFileReader is based on reactivePoll so I thought the behaviour should be the same when setting session = NULL. However it seems reactivePoll's valueFunc still is executed for each session. Please see the following example: library(shiny) ui <- fluidPage(textOutput("time")) server <- fun…