@CosId Field Filling

@CosId marks the id field of an entity; IdFiller fills it from a generator. The MyBatis and Spring Data JDBC integrations call it before an insert, and you can call it yourself: runtime.filler().fill(entity) (in Spring, inject IdFiller). It is part of cosid-core (me.ahoo.cosid.accessor).

java

public class Order {
    @CosId                  // the "default" generator
    private long id;
}

public class Bill {
    @CosId("bill")          // a named generator
    private String id;      // text through the generator's codec
}

@CosId(value = "order", field = "orderId")   // on the type: names the field
public class LineItem extends BaseEntity { }

Field types: long / Long, int / Integer (range checked, IdOverflowException), and String (through the generator's codec; cosid80 through its PartsCodec, periodic-segment through its GroupedCodec, uuidv7 as the canonical UUID text; a uuidv7 generator fills String fields only).
A field is filled only when unset: ≤ 0, null, or an empty string.
Getters and setters are used when present, the field otherwise. Superclasses are searched, and generic field types are resolved. A class has at most one id.
The accessor of each class is resolved on first use and cached as method handles. There is no scanning or registration step (4.x's accessor registry and scanner are gone).

@CosId Field Filling ​

@CosId Field Filling