taskCallbackNames {base}

R Documentation

Query the names of the current internal top-level task callbacks

Usage

getTaskCallbackNames()

Value

A character vector giving the name for each of the registered callbacks which are invoked when a top-level task is completed successfully. Each name is the one used when registering the callbacks and returned as the in the call to addTaskCallback.

Note

This is an experimental feature and the interface may be changed in the future.

See Also

addTaskCallback removeTaskCallback taskCallbackManager http://developer.r-project.org/TaskHandlers.pdf

Examples

  n <- addTaskCallback(function(expr, value, ok, visible) {
                         cat("In handler\n")
                         return(TRUE)
                       }, name = "simpleHandler")

  getTaskCallbackNames()

    # now remove it by name
  removeTaskCallback("simpleHandler")


  h <- taskCallbackManager()
  h$add(function(expr, value, ok, visible) {
                         cat("In handler\n")
                         return(TRUE)
                       }, name = "simpleHandler")
  getTaskCallbackNames()
  removeTaskCallback("R-taskCallbackManager")

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