Logout
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Contents |
Introduction
This is the logout process as initiated by a user quitting the viewer.
Logout
Notes
- Many viewers will log out whether they receive logout confirmation from the simulator or not. On the Linden viewer 3.3.4, for example, quit will always happen after 6 seconds.
- Logging back in whilst logout processing is still occuring will cause login to be delayed but it should succeed.
Key
| key | description |
|---|---|
| GU | griduser service |
| P | presence service |
| R | region occuped by the user's avatar |
| RCh | neighbour of avatar region |
| RFr | region containing friend |
| V | viewer |
Communication
Communication occurs between:
- Viewer and region (V <-> R)
- Region and grid user service (R -> GU)
- Region and presence service (R -> P)
- Region and neighbours (R -> RCh)
- Neighbours and viewer (RCh -> V)
- Region and other regions containing user's online friends (R -> RFr)
Steps
The steps involving listeners are not exhausive. Only the most significant operations are listed.
- V->R, on user quit, viewer sends a LogoutRequest UDP packet to the region.
- R->V, simulator immediate replies with a LogoutReply UDP packet.
- R, begins to tear down structures specific to the LL connection
- R, triggers IClientAPI.OnConnectionClosed event internally, causing listeners to
- R->GU, tell the grid user service that the user has logged out.
- R->P, tell the presence service that the user has logged out.
- R, Tell the scene to start cleaning up its data structures (this is the bulk of the cleanup work).
- R->RCh, tell any neighbours to close their child agents for this viewer.
- RCh-V, these neighbours will in turn tell the viewer that the regions are closing (not actually necessary).
- R->RCh, tell any neighbours to close their child agents for this viewer.
- R, triggers EventManager.OnClientClosed event internally, causing listeners to
- R->P, asks the presence service for which of the user's friends are online.
- R->RFr, tell regions containing online friends that the user has gone offline.
- R, triggers EventManager.OnRemovePresence event internally (this duplicates OnClientClosed and may be removed in the future).
- R, derezzes the avatar's attachments, hence shutting down and saving any attachment script state.
- R, tells other avatars still in the scene that the user has gone via the KillObject UDP packet.
- R, removes the scene presence and client structures and removes the avatar's physics object.
