Packages

trait JdbcHandler[Envelope, S <: JdbcSession] extends JdbcHandlerLifecycle

Implement this interface for the Envelope handler for Jdbc Projections.

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
JdbcHandler.scala
Linear Supertypes
JdbcHandlerLifecycle, AnyRef, Any
Ordering
  1. Alphabetic
  2. By Inheritance
Inherited
  1. JdbcHandler
  2. JdbcHandlerLifecycle
  3. AnyRef
  4. Any
  1. Hide All
  2. Show All
Visibility
  1. Public
  2. Protected

Abstract Value Members

  1. abstract def process(session: S, envelope: Envelope): Unit

    The process method is invoked for each Envelope.

    The process method is invoked for each Envelope. Each time a new JdbcSession is passed with a new open transaction. It's allowed to run any blocking JDBC operation inside this method.

    One envelope is processed at a time. It will not be invoked with the next envelope until after this method returns.

Concrete Value Members

  1. def start(): Unit

    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.

    Definition Classes
    JdbcHandlerLifecycle
  2. def stop(): Unit

    Invoked when the projection has been stopped.

    Invoked when the projection has been stopped. Can be overridden to implement resource cleanup.

    Definition Classes
    JdbcHandlerLifecycle