Packages

trait SlickHandler[Envelope] extends HandlerLifecycle

Implement this interface for the Envelope handler in SlickProjection.

It can be stateful, with variables and mutable data structures. It is invoked by the Projection machinery one envelope at a time and visibility guarantees between the invocations are handled automatically, i.e. no volatile or other concurrency primitives are needed for managing the state.

Supported error handling strategies for when processing an Envelope fails can be defined in configuration or using the withRecoveryStrategy method of a Projection implementation.

Source
SlickProjection.scala
Linear Supertypes
HandlerLifecycle, AnyRef, Any
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Inherited
  1. SlickHandler
  2. HandlerLifecycle
  3. AnyRef
  4. Any
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Visibility
  1. Public
  2. Protected

Abstract Value Members

  1. abstract def process(envelope: Envelope): DBIO[Done]

Concrete Value Members

  1. def start(): Future[Done]

    Invoked when the projection is starting, before first envelope is processed.

    Invoked when the projection is starting, before first envelope is processed. Can be overridden to implement initialization. It is also called when the Projection is restarted after a failure.

    Definition Classes
    HandlerLifecycle
  2. def stop(): Future[Done]

    Invoked when the projection has been stopped.

    Invoked when the projection has been stopped. Can be overridden to implement resource cleanup. It is also called when the Projection is restarted after a failure.

    Definition Classes
    HandlerLifecycle