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Proposal for the loading state machines
ViewFrame state machine
States are:
E: Empty (the initial state right after construction)
A: Activating (waiting for component to be activated)
N: No load_location request (a view component has been loaded, but no load_location request has been sent yet)
W: Waiting (waiting for a response after a load request)
U: Underway (the component has responded and the load is assumed underway)
L: Loaded (the component has finished loading successfully)
F: Failed (there was a fatal error somewhere)
X: this stimulus is guaranteed impossible in this state
Things I was unsure about:
?2: Once a load has failed at some stage, should it be OK for Nautilus
to try to make further calls of any kind?
Missing:
1) "Component stops responding" stimulus.
2) Distinction of failure loading vs. crash of the component.
Note:
A "*" means that this is illegal but non-fatal, so we want to use g_warning.
State Transition Chart
Initial State
| E | A | N | W | U | L | F |
----------------------------------------|-----|-----|-----|-----|-----|-----|-----|
successful load_client call | A | X | X | X | X | X | ?2 |
----------------------------------------|-----|-----|-----|-----|-----|-----|-----|
unsuccessful load_client call | F | X | X | X | X | X | ?2 |
----------------------------------------|-----|-----|-----|-----|-----|-----|-----|
successful activated_component call | X | N | X | X | X | X | ?2 |
----------------------------------------|-----|-----|-----|-----|-----|-----|-----|
unsuccessful activated_component call | X | F | X | X | X | X | ?2 |
----------------------------------------|-----|-----|-----|-----|-----|-----|-----|
stop activation | E | E | X | X | X | X | ?2 |
----------------------------------------|-----|-----|-----|-----|-----|-----|-----|
nautilus_view_frame_load_location call | X | F | W | W | W | W | ?2 |
----------------------------------------|-----|-----|-----|-----|-----|-----|-----|
open_location call from component | X | X | N* | U | U | L | X |
----------------------------------------|-----|-----|-----|-----|-----|-----|-----|
open_location_in_new_window | X | X | N* | U | U | L | X |
----------------------------------------|-----|-----|-----|-----|-----|-----|-----|
report_location_change | X | X | N* | U | U | U | X |
S ----------------------------------------|-----|-----|-----|-----|-----|-----|-----|
t report_selection_change | X | X | N* | U | U | L | X |
i ----------------------------------------|-----|-----|-----|-----|-----|-----|-----|
m report_status | X | X | N* | U | U | L | X |
u ----------------------------------------|-----|-----|-----|-----|-----|-----|-----|
l report_load_underway | X | X | N* | U | U | U | X |
u ----------------------------------------|-----|-----|-----|-----|-----|-----|-----|
s report_load_progress | X | X | N* | U | U | U | X |
----------------------------------------|-----|-----|-----|-----|-----|-----|-----|
report_load_complete | X | X | N* | L | L | L | X |
----------------------------------------|-----|-----|-----|-----|-----|-----|-----|
report_load_failed | X | X | N* | F | F | F | X |
----------------------------------------|-----|-----|-----|-----|-----|-----|-----|
set_title | X | X | N* | U | U | L | X |
----------------------------------------|-----|-----|-----|-----|-----|-----|-----|
user hits cancel on timer dialog | X | X | X | F | X | X | X |
----------------------------------------|-----|-----|-----|-----|-----|-----|-----|
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