Legacy Displacement: Revert to Source
Martin Fowler
JULY 7, 2022
Legacy systems often act as integration hubs, ingesting source data to pass on to downstream systems. A new downstream system can decouple itself from legacy by finding the source of data to the legacy and integrating directly to that instead. Ian Cartwright, Rob Horn, and James Lewis describe this Revert to Source pattern, explaining that this part of legacy displacement often also allows a new system to take advantage of upgrades to source data that the legacy had neglected.
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