Interface which allows a controlling thread to cancel the processing of another thread in a controlled manner.
Helper class used to run database queries in the background and provide the user with a cancellable "wait" dialog.
A dialog which will indicate to the user that an operation is being performed and will provide them an opportunity to try and cancel that operation.
Class which will close the wait dialog once the worker thread has completed processing (or exited early due to a cancel being issued).
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