Application Protocol
Goals

• Network clients manipulate virtual world
• Equipotent clients
• Persistence
• State consistency

Paradigm

• Message/Event based
• Universal sequencing, reliable delivery
• Event type, event streams
• State available on the wire
  Clients maintain state of interest
• Environment composed of objects
  Objects have multiple components
  Clients own components
• Lock, modify, release model (distributed database)
• Clients responsible for honoring ownership

Example

Client wishing to move an object in the virtual world
• Broadcast ownership request for the object's transformation matrix component
• ... Possibly wait for ownership request to return
• Broadcast new transformation matrices for object (set transformation request)
• Release object's transformation matrix

All clients interested in this object's position
• Receive ownership request
• Assign ownership only if it is not already owned
• ...
• Receive set transformation request
• Set object's transformation only if this message is from the owner

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