server/io.spine.server.projection.migration/UpdateProjectionColumns

UpdateProjectionColumns

public final class UpdateProjectionColumns<I, P extends Projection<I, S, B>, S extends EntityState, B extends ValidatingBuilder<S>> extends ProjectionMigration<I, P, S, B>

A migration operation that does the update of interface-based columns of a Projection.

When applied to an entity, this operation will trigger the recalculation of entity storage fields according to the current implementation of EntityWithColumns-derived methods.

Such operation may be useful when the logic behind manually calculated columns changes as well as when adding the new columns to an entity.

See also

InterfaceBasedColumn

RecordBasedRepository

Constructors

UpdateProjectionColumns

public void UpdateProjectionColumns()

Functions

public S apply(S s)

Inherited functions

public Function<T, V> andThen<V>(Function<? extends Object, ? extends V> after)

public Function<V, R> compose<V>(Function<? extends Object, ? extends T> before)

protected final I id()

Returns the ID of an entity under migration.

public static Function<T, T> identity<T>()

protected final boolean isArchived()

Returns true if the entity under migration is archived.

protected final boolean isDeleted()

Returns true if the entity under migration is deleted.

protected final void markArchived()

Marks the entity under migration as archived.

protected final void markDeleted()

Marks the entity under migration as deleted.

removeFromStorage

protected final void removeFromStorage()

Configures the migration operation to delete the entity record from the storage.

startTransaction

protected abstract Transaction<I, E, S, ? extends Object> startTransaction(E entity)

protected Transaction<I, P, S, ? extends Object> startTransaction(P entity)

Opens a transaction on an entity.

protected final Version version()

Returns the version of entity under migration.