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InjectableBrains

SWARM objects are state-machines that need PlansAndPhases? to drive them. They must be able to completely transform their state based on their current process phase. To achieve this, we use the idea of "injectable brains." There are three main participants in the brain injection process:

  • BrainRecipients?
  • BrainDonors?
  • BrainExchange?

BrainRecipients? know their BrainExchange?, which knows the available BrainDonors?. When retrieved from a Rack, BrainRecipients? ask their BrainExchange? for a brain based on their current state. The exchange may have the appropriate brain cached, or it may have to go to the BrainDonors? to assemble a fresh brain.

The assembled brain is injected into an attribute (_v_brains, perhaps?) and then is used by a custom getattr hook on the brain recipient. The brains are a mapping object (possibly a MultiMapping?) which are used to provide attributes for the otherwise empty-headed object.
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