Making Aggregates Work Together through Identity References
Prefer references to external Aggregates only by their globally unique identity, not by holding a direct object reference (or “pointer”). This is exemplified in Figure 10.6.
We would refactor the source to
public class BacklogItem extends ConcurrencySafeEntity { ... private ProductId productId; ... }
Aggregates with inferred object references are thus automatically smaller because references are never eagerly loaded. The model can perform better ...
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