| taskCallbackNames | R Documentation |
This provides a way to get the names (or identifiers) for the currently registered task callbacks that are invoked at the conclusion of each top-level task. These identifiers can be used to remove a callback.
getTaskCallbackNames()
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.
One can use taskCallbackManager
to manage user-level task callbacks,
i.e., S-language functions, entirely within
the S language and access the names
more directly.
addTaskCallback,
removeTaskCallback,
taskCallbackManager\
https://developer.r-project.org/TaskHandlers.pdf
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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