This is an advanced scripting function. Invokes (calls) the given Python function on a different thread. This means that calls to invokeAsynchronous will return immediately, and then the given function will start executing asynchronously on a different thread. This is useful for long-running data intensive functions, where running them synchronously (in the GUI thread) would make the GUI non-responsive for an unacceptable amount of time.
Under no circumstances should you ever do anything in the function that is invoked asynchronously that interacts with the GUI. This means things like window navigation, setting and getting component properties, showing error/message popups, etc. If you need to do something with the GUI in this function, this must be achieved through a call tosystem.util.invokeLater.
PyObjectfunction- A Python function object that will get invoked with no arguments in a separate thread.
Iterable args - A list or tuple of Python objects that will be provided to the called function as arguments. Equivalent to the * operator. [optional]. Added in 8.0.15.
Dictionary kwargs - A dictionary of keyword argument names to Python object values that will be provided to the called function as keyword arguments. Equivalent to the ** operator. [optional]. Added in 8.0.15.
String description - A description to use for the asynchronous thread. Will be displayed on the current scope's diagnostic view for scripts. For Vision and the Designer, this would be the "Scripts" tab of the Diagnostics popup. For Perspective and the Gateway scope, this would be the Gateway's Running Scripts status page [optional]. Added in 8.0.15.
# This code would do some data-intensive processing, and then call
# back to the GUI to let it know that it is finished.
# We use default function parameters to pass the root container into these
# functions. (See a Python reference if you don't understand this)
def longProcess(rootContainer = event.source.parent):
# Do something here with the database that takes a long time
results = ...( something )
# Now we'll send our results back to the UI
def sendBack(results = results, rootContainer = rootContainer):
rootContainer.resultsProperty = results
system.util.invokeAsynchronous(longProcess) #Note that this is 'longProcess' instead of 'longProcess()'
system util invokeAsynchronous, util.invokeAsynchronous