Saving and restoring state from a room

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More general question,

I want to have dynamic rooms and then be able to save off the state/synced entities of a room when everyone leaves, then restore that state/synced entities when the room starts up again. My guess is that this would need a simulation server but I’m curious if that is necessary? So this mostly an implementation type question to see what the best route to do this would be.

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Hi, yes in a scenario where you wanted to persist some state on a rooms based gameplay, a simulation server would handle this. You’ll need an identifier to connect your state across room sessions. You can pass this identifier as a tag or k/v when you create the rooms through the SDK, e.g. with these options: Interface IRoomsService | Unity Documentation

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How would I save the state or is this something the replication server does based on the identifier? Or is there another part of the sdk to serialize out the sync objects?

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Hi Michael!

To elaborate on Brit’s answer, there are several options:

  1. Use worlds, then entities set as “persistent” will automatically persist - worlds can also be set to auto-suspend so when nobody is there, they will not consume credits. This is the most native solution.
  2. Use rooms with a separate backend, i.e. enumerate the entities that need to persist in e.g. JSON and save them somewhere with the room identifier you are using.
  3. Anything client-related can be stored in the client’s KV store (see our docs for KV store).

We have room-based persistence (based on ID) in our roadmap as well, but it’s not a priority right now.

-Tadej

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