Packages

t

akka.projection

Projection

trait Projection[Envelope] extends AnyRef

The core abstraction in Akka Projections.

A projection instance may share the same name and Envelope, but must have a unique key. The key is used to achieve processing parallelism for a projection.

For example, many projections may share the same name "user-events-projection", but can process events for different sharded entities within Akka Cluster, where key could be the Akka Cluster shardId.

Envelope

The envelope type of the projection.

Source
Projection.scala
Linear Supertypes
AnyRef, Any
Known Subclasses
AtLeastOnceFlowProjection, AtLeastOnceProjection, AtMostOnceProjection, ExactlyOnceProjection, GroupedProjection, AtLeastOnceFlowProjection, AtLeastOnceProjection, AtMostOnceProjection, ExactlyOnceProjection, GroupedProjection, TestProjection, TestProjection
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Inherited
  1. Projection
  2. AnyRef
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Visibility
  1. Public
  2. Protected

Abstract Value Members

  1. abstract def projectionId: ProjectionId
  2. abstract def statusObserver: StatusObserver[Envelope]
  3. abstract def withRestartBackoff(minBackoff: Duration, maxBackoff: Duration, randomFactor: Double, maxRestarts: Int): Projection[Envelope]

    Java API

  4. abstract def withRestartBackoff(minBackoff: Duration, maxBackoff: Duration, randomFactor: Double): Projection[Envelope]

    Java API

  5. abstract def withRestartBackoff(minBackoff: FiniteDuration, maxBackoff: FiniteDuration, randomFactor: Double, maxRestarts: Int): Projection[Envelope]
  6. abstract def withRestartBackoff(minBackoff: FiniteDuration, maxBackoff: FiniteDuration, randomFactor: Double): Projection[Envelope]
  7. abstract def withStatusObserver(observer: StatusObserver[Envelope]): Projection[Envelope]