Languages:

English    Français

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

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, 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.