The Bubble or Bubble Context pattern was defined by Eric Evans, the author of Domain-Driven Design. The idea is to gradually build a new domain model for a given subsystem/subdomain that sits in front of the legacy model.
Over time, as more logic gets built-in the new model (the bubble), it delegates less and less to the legacy, until eventually the bubble “pops” - the legacy is gone.
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We're working on more details for this pattern. Stay tuned for updates!