# Session Tracking

Some plugins may want to save state when the user closes Builder. The Ide.SessionAddin allows for saving and restoring state when a project is closed or re-opened.

    # my_plugin.py

    import gi

    from gi.repository import GObject
    from gi.repository import Gio
    from gi.repository import Ide

    class MySessionAddin(Ide.Object, Ide.SessionAddin):

        def do_save_async(self, cancellable, callback, data):
            # Create our async task
            task = Ide.Task.new(sel, cancellable, callback)

            # State is saved as a variant
            task.result = GLib.Variant.new_int(123)

            # Now complete task
            task.return_boolean(True)

        def do_save_finish(self, task):
            if task.propagate_boolean():
                return task.result

        def do_restore_async(self, state, cancellable, callback, data):
            # Create our async task
            task = Ide.Task.new(sel, cancellable, callback)

            # state is a GLib.Variant matching what we saved

            # Now complete task
            task.return_boolean(True)

        def do_restore_finish(self, task):
            return task.propagate_boolean()