reactivePoll2: Reactive Polling

In misha-lisovich/laminar: An Improved Real-Time UI for Apache Airflow

Description

Specialization of shiny::reactivePoll where checkFunc is reused as valueFunc. Useful making database table sources reactive without querying twice.

Usage

reactivePoll2(intervalMillis, session, checkFunc)

Arguments

intervalMillis	Approximate number of milliseconds to wait between calls to checkFunc. This can be either a numeric value, or a function that returns a numeric value.
session	The user session to associate this file reader with, or NULL if none. If non-null, the reader will automatically stop when the session ends.
checkFunc	A relatively cheap function whose values over time will be tested for equality; inequality indicates that the underlying value has changed and needs to be invalidated and re-read using valueFunc. See Details.

Examples

 ## Not run: cars <- reactivePoll(1000, session, collect(tbl(db, sql('select * from cars'))) )

misha-lisovich/laminar documentation built on May 23, 2019, 9:51 a.m.