Generate a new Handle when this one is loaded
Return the Handle's value (will block the task if that handle isn't loaded yet)
Set the value of the Handle (will reschedule all tasks waiting on it)
Set the value of the Handle (will reschedule all tasks waiting on it)
Generate a new Handle when this one is loaded
Specify in advance that the task creating this Handle's value will use the provided handle(s)
(Since version ) see corresponding Javadoc for more information.