Editing OpenSimulator Internals/Architecture Overview (section)

== Services ==

ROBUST provides grid-wide services over HTTP. Each service is a separate plugin registered on startup from [ServiceList] in Robust.ini.

Services fall into two categories:

'''Must run in a single instance''' -- these maintain shared state and would give conflicting answers if load-balanced:
* PresenceService -- who is online, which region, current session
* UserAgentService -- HyperGrid travel management
* AgentPreferencesService -- per-user preferences
* GridUserService -- home region, last login location

'''Can be load-balanced''' -- stateless, safe to run on multiple machines behind a load balancer:
* AssetService -- asset blob storage
* InventoryService -- user inventory
* GridService -- region map
* UserAccountService -- user accounts
* AuthenticationService -- login authentication
* GroupsService -- groups

See [[OpenSimulator Internals/ROBUST Services]] for full details.

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