Class

stamina.migrations

Migrator

Related Doc: package migrations

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class Migrator[R, V <: Version] extends AnyRef

A Migrator[R, V] can migrate raw values of type R from older versions to version V by applying a specific Migration[R] to it.

You can create instances of Migrator[R, V] by using a small type-safe DSL consisting of two parts: the from[R, V1] function will create a Migrator[R, V1] and then you can use the to[V](migration: Migration[R]) function to build instances that can migrate multiple versions.

R

The type of raw data being migrated. In the JSON implementation this would be JsValue.

V

The "current" version of this Migrator, i.e. it can migrate values from V1 to this version or any version in between.

Example:

  1. Using the json implementation:

    val p = persister[CartCreated, V3]("cart-created",
  from[JsValue, V1]
    .to[V2](_.update('cart / 'items / * / 'price ! set[Int](1000)))
    .to[V3](_.update('timestamp ! set[Long](System.currentTimeMillis - 3600000L)))
)
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  1. final def !=(arg0: Any): Boolean

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  2. final def ##(): Int

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  3. final def ==(arg0: Any): Boolean

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  4. final def asInstanceOf[T0]: T0

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  5. def canMigrate(fromVersion: Int): Boolean

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  6. def clone(): AnyRef

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  7. final def eq(arg0: AnyRef): Boolean

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  9. def finalize(): Unit

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  10. final def getClass(): Class[_]

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  11. def hashCode(): Int

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  12. final def isInstanceOf[T0]: Boolean

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  13. def migrate(value: R, fromVersion: Int): R

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  14. final def ne(arg0: AnyRef): Boolean

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  15. final def notify(): Unit

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  16. final def notifyAll(): Unit

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  17. final def synchronized[T0](arg0: ⇒ T0): T0

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  18. def to[NextV <: Version](migration: Migration[R])(implicit arg0: VersionInfo[NextV], isNextAfter: IsNextVersionAfter[NextV, V]): Migrator[R, NextV]

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  19. def toString(): String

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  20. final def wait(): Unit

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  21. final def wait(arg0: Long, arg1: Int): Unit

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  22. final def wait(arg0: Long): Unit

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