akka.actor

Extension

trait Extension extends AnyRef

The basic ActorSystem covers all that is needed for locally running actors, using futures and so on. In addition, more features can hook into it and thus become visible to actors et al by registering themselves as extensions. This is accomplished by providing an extension—which is an object implementing this trait—to ActorSystem.registerExtension(...) or by specifying the corresponding option in the configuration passed to ActorSystem, which will then instantiate (without arguments) each FQCN and register the result.

The extension itself can be created in any way desired and has full access to the ActorSystem implementation.

This trait is only a marker interface to signify an Akka Extension. This is how an extension is normally constructed.

Scala API:

object MyExt extends ExtensionId[Ext] with ExtensionIdProvider {

  override def lookup = MyExt

  override def createExtension(system: ExtendedActorSystem): Ext = new Ext(system)

  // Java API: retrieve the extension for the given system.
  override def get(system: ActorSystem): UdpExt = super.get(system)
}

class Ext(system: ExtendedActorSystem) extends Extension {
  ...
}

Java API:

public class MyExt extends AbstractExtensionId<MyExtImpl>
  implements ExtensionIdProvider {
  public final static MyExt MyExtProvider = new MyExt();

  private MyExt() {}

  public MyExt lookup() {
    return MyExt.MyExtProvider;
  }

  public MyExtImpl createExtension(ExtendedActorSystem system) {
    return new MyExtImpl();
  }
}

public class MyExtImpl implements Extension {
   ...
}

See also akka.actor.ExtensionKey for a concise way of formulating extensions.

Source
Extension.scala
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Value Members

  1. final def !=(arg0: AnyRef): Boolean

    Definition Classes
    AnyRef
  2. final def !=(arg0: Any): Boolean

    Definition Classes
    Any
  3. final def ##(): Int

    Definition Classes
    AnyRef → Any
  4. def +(other: String): String

    Implicit information
    This member is added by an implicit conversion from Extension to StringAdd performed by method any2stringadd in scala.Predef.
    Definition Classes
    StringAdd
  5. def ->[B](y: B): (Extension, B)

    Implicit information
    This member is added by an implicit conversion from Extension to ArrowAssoc[Extension] performed by method any2ArrowAssoc in scala.Predef.
    Definition Classes
    ArrowAssoc
    Annotations
    @inline()
  6. final def ==(arg0: AnyRef): Boolean

    Definition Classes
    AnyRef
  7. final def ==(arg0: Any): Boolean

    Definition Classes
    Any
  8. final def asInstanceOf[T0]: T0

    Definition Classes
    Any
  9. def clone(): AnyRef

    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  10. def ensuring(cond: (Extension) ⇒ Boolean, msg: ⇒ Any): Extension

    Implicit information
    This member is added by an implicit conversion from Extension to Ensuring[Extension] performed by method any2Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  11. def ensuring(cond: (Extension) ⇒ Boolean): Extension

    Implicit information
    This member is added by an implicit conversion from Extension to Ensuring[Extension] performed by method any2Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  12. def ensuring(cond: Boolean, msg: ⇒ Any): Extension

    Implicit information
    This member is added by an implicit conversion from Extension to Ensuring[Extension] performed by method any2Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  13. def ensuring(cond: Boolean): Extension

    Implicit information
    This member is added by an implicit conversion from Extension to Ensuring[Extension] performed by method any2Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  14. final def eq(arg0: AnyRef): Boolean

    Definition Classes
    AnyRef
  15. def equals(arg0: Any): Boolean

    Definition Classes
    AnyRef → Any
  16. def finalize(): Unit

    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( classOf[java.lang.Throwable] )
  17. def formatted(fmtstr: String): String

    Implicit information
    This member is added by an implicit conversion from Extension to StringFormat performed by method any2stringfmt in scala.Predef.
    Definition Classes
    StringFormat
    Annotations
    @inline()
  18. final def getClass(): Class[_]

    Definition Classes
    AnyRef → Any
  19. def hashCode(): Int

    Definition Classes
    AnyRef → Any
  20. final def isInstanceOf[T0]: Boolean

    Definition Classes
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  21. final def ne(arg0: AnyRef): Boolean

    Definition Classes
    AnyRef
  22. final def notify(): Unit

    Definition Classes
    AnyRef
  23. final def notifyAll(): Unit

    Definition Classes
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  24. final def synchronized[T0](arg0: ⇒ T0): T0

    Definition Classes
    AnyRef
  25. def toString(): String

    Definition Classes
    AnyRef → Any
  26. final def wait(): Unit

    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  27. final def wait(arg0: Long, arg1: Int): Unit

    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  28. final def wait(arg0: Long): Unit

    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  29. def [B](y: B): (Extension, B)

    Implicit information
    This member is added by an implicit conversion from Extension to ArrowAssoc[Extension] performed by method any2ArrowAssoc in scala.Predef.
    Definition Classes
    ArrowAssoc

Shadowed Implicit Value Members

  1. val self: Any

    Implicit information
    This member is added by an implicit conversion from Extension to StringAdd performed by method any2stringadd in scala.Predef.
    Shadowing
    This implicitly inherited member is ambiguous. One or more implicitly inherited members have similar signatures, so calling this member may produce an ambiguous implicit conversion compiler error.
    To access this member you can use a type ascription:
    (extension: StringAdd).self
    Definition Classes
    StringAdd
  2. val self: Any

    Implicit information
    This member is added by an implicit conversion from Extension to StringFormat performed by method any2stringfmt in scala.Predef.
    Shadowing
    This implicitly inherited member is ambiguous. One or more implicitly inherited members have similar signatures, so calling this member may produce an ambiguous implicit conversion compiler error.
    To access this member you can use a type ascription:
    (extension: StringFormat).self
    Definition Classes
    StringFormat

Deprecated Value Members

  1. def x: Extension

    Implicit information
    This member is added by an implicit conversion from Extension to ArrowAssoc[Extension] performed by method any2ArrowAssoc in scala.Predef.
    Shadowing
    This implicitly inherited member is ambiguous. One or more implicitly inherited members have similar signatures, so calling this member may produce an ambiguous implicit conversion compiler error.
    To access this member you can use a type ascription:
    (extension: ArrowAssoc[Extension]).x
    Definition Classes
    ArrowAssoc
    Annotations
    @deprecated
    Deprecated

    (Since version 2.10.0) Use leftOfArrow instead

  2. def x: Extension

    Implicit information
    This member is added by an implicit conversion from Extension to Ensuring[Extension] performed by method any2Ensuring in scala.Predef.
    Shadowing
    This implicitly inherited member is ambiguous. One or more implicitly inherited members have similar signatures, so calling this member may produce an ambiguous implicit conversion compiler error.
    To access this member you can use a type ascription:
    (extension: Ensuring[Extension]).x
    Definition Classes
    Ensuring
    Annotations
    @deprecated
    Deprecated

    (Since version 2.10.0) Use resultOfEnsuring instead

Inherited from AnyRef

Inherited from Any

Inherited by implicit conversion any2stringadd from Extension to StringAdd

Inherited by implicit conversion any2stringfmt from Extension to StringFormat

Inherited by implicit conversion any2ArrowAssoc from Extension to ArrowAssoc[Extension]

Inherited by implicit conversion any2Ensuring from Extension to Ensuring[Extension]

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