c

akka.actor.typed.javadsl

AbstractOnMessageBehavior

abstract class AbstractOnMessageBehavior[T] extends ExtensibleBehavior[T]

An actor Behavior can be implemented by extending this class and implementing the abstract method AbstractOnMessageBehavior#onMessage. Mutable state can be defined as instance variables of the class.

This is an object-oriented style of defining a Behavior. A more functional style alternative is provided by the factory methods in Behaviors, for example Behaviors.receiveMessage.

An alternative object-oriented style is found in AbstractBehavior, which uses builders to define the Behavior. In contrast to extending AbstractBehavior, extending this class should have reduced overhead, though depending on the complexity of the protocol handled by this actor and on the Java version in use, the onMessage and onSignal methods may be overly complex.

Instances of this behavior should be created via Behaviors.setup and the ActorContext should be passed as a constructor parameter from the factory function. This is important because a new instance should be created when restart supervision is used.

When switching behavior to another behavior which requires a context, the original ActorContext can be used or a Behaviors.setup can be used: either will end up using the same ActorContext instance.

It must not be created with an ActorContext of another actor (e.g. the parent actor). Doing so will be detected at runtime and throw an IllegalStateException when the first message is received.

Source
AbstractOnMessageBehavior.scala
See also

Behaviors.setup

Linear Supertypes
Type Hierarchy
Ordering
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  2. By Inheritance
Inherited
  1. AbstractOnMessageBehavior
  2. ExtensibleBehavior
  3. Behavior
  4. AnyRef
  5. Any
Implicitly
  1. by BehaviorDecorators
  2. by any2stringadd
  3. by StringFormat
  4. by Ensuring
  5. by ArrowAssoc
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Visibility
  1. Public
  2. Protected

Instance Constructors

  1. new AbstractOnMessageBehavior(context: ActorContext[T])

Abstract Value Members

  1. abstract def onMessage(message: T): Behavior[T]

    Implement this to define how messages are processed.

    Implement this to define how messages are processed. To indicate no change in behavior beyond changes due to updating instance variables of this class, one may return either this or Behaviors.same.

    Annotations
    @throws(classOf[Exception])

Concrete Value Members

  1. final def !=(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  2. final def ##: Int
    Definition Classes
    AnyRef → Any
  3. def +(other: String): String
    Implicit
    This member is added by an implicit conversion from AbstractOnMessageBehavior[T] toany2stringadd[AbstractOnMessageBehavior[T]] performed by method any2stringadd in scala.Predef.
    Definition Classes
    any2stringadd
  4. def ->[B](y: B): (AbstractOnMessageBehavior[T], B)
    Implicit
    This member is added by an implicit conversion from AbstractOnMessageBehavior[T] toArrowAssoc[AbstractOnMessageBehavior[T]] performed by method ArrowAssoc in scala.Predef.
    Definition Classes
    ArrowAssoc
    Annotations
    @inline()
  5. final def ==(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  6. final def asInstanceOf[T0]: T0
    Definition Classes
    Any
  7. val behavior: Behavior[T]
    Implicit
    This member is added by an implicit conversion from AbstractOnMessageBehavior[T] toBehaviorDecorators[T] performed by method BehaviorDecorators in akka.actor.typed.Behavior.
    Definition Classes
    BehaviorDecorators
  8. def clone(): AnyRef
    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.CloneNotSupportedException]) @HotSpotIntrinsicCandidate() @native()
  9. def ensuring(cond: (AbstractOnMessageBehavior[T]) => Boolean, msg: => Any): AbstractOnMessageBehavior[T]
    Implicit
    This member is added by an implicit conversion from AbstractOnMessageBehavior[T] toEnsuring[AbstractOnMessageBehavior[T]] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  10. def ensuring(cond: (AbstractOnMessageBehavior[T]) => Boolean): AbstractOnMessageBehavior[T]
    Implicit
    This member is added by an implicit conversion from AbstractOnMessageBehavior[T] toEnsuring[AbstractOnMessageBehavior[T]] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  11. def ensuring(cond: Boolean, msg: => Any): AbstractOnMessageBehavior[T]
    Implicit
    This member is added by an implicit conversion from AbstractOnMessageBehavior[T] toEnsuring[AbstractOnMessageBehavior[T]] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  12. def ensuring(cond: Boolean): AbstractOnMessageBehavior[T]
    Implicit
    This member is added by an implicit conversion from AbstractOnMessageBehavior[T] toEnsuring[AbstractOnMessageBehavior[T]] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  13. final def eq(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  14. def equals(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef → Any
  15. final def getClass(): Class[_ <: AnyRef]
    Definition Classes
    AnyRef → Any
    Annotations
    @HotSpotIntrinsicCandidate() @native()
  16. final def getContext: ActorContext[T]
    Attributes
    protected
  17. def hashCode(): Int
    Definition Classes
    AnyRef → Any
    Annotations
    @HotSpotIntrinsicCandidate() @native()
  18. final def isInstanceOf[T0]: Boolean
    Definition Classes
    Any
  19. final def narrow[U <: T]: Behavior[U]

    Narrow the type of this Behavior, which is always a safe operation.

    Narrow the type of this Behavior, which is always a safe operation. This method is necessary to implement the contravariant nature of Behavior (which cannot be expressed directly due to type inference problems).

    Definition Classes
    Behavior
  20. final def ne(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  21. final def notify(): Unit
    Definition Classes
    AnyRef
    Annotations
    @HotSpotIntrinsicCandidate() @native()
  22. final def notifyAll(): Unit
    Definition Classes
    AnyRef
    Annotations
    @HotSpotIntrinsicCandidate() @native()
  23. def onSignal(signal: Signal): Behavior[T]

    Override this to handle a signal.

    Override this to handle a signal. The default implementation handles only MessageAdaptionFailure and otherwise ignores the signal.

    Annotations
    @throws(classOf[Exception])
  24. final def receive(ctx: TypedActorContext[T], msg: T): Behavior[T]

    Process an incoming message and return the next behavior.

    Process an incoming message and return the next behavior.

    The returned behavior can in addition to normal behaviors be one of the canned special objects:

    * returning stopped will terminate this Behavior * returning same designates to reuse the current Behavior * returning unhandled keeps the same Behavior and signals that the message was not yet handled

    Code calling this method should use Behavior$ canonicalize to replace the special objects with real Behaviors.

    Definition Classes
    AbstractOnMessageBehaviorExtensibleBehavior
    Annotations
    @throws(classOf[Exception])
  25. final def receiveSignal(ctx: TypedActorContext[T], signal: Signal): Behavior[T]

    Process an incoming Signal and return the next behavior.

    Process an incoming Signal and return the next behavior. This means that all lifecycle hooks, ReceiveTimeout, Terminated and Failed messages can initiate a behavior change.

    The returned behavior can in addition to normal behaviors be one of the canned special objects:

    * returning stopped will terminate this Behavior * returning same designates to reuse the current Behavior * returning unhandled keeps the same Behavior and signals that the message was not yet handled

    Code calling this method should use Behavior$ canonicalize to replace the special objects with real Behaviors.

    Definition Classes
    AbstractOnMessageBehaviorExtensibleBehavior
    Annotations
    @throws(classOf[Exception])
  26. final def synchronized[T0](arg0: => T0): T0
    Definition Classes
    AnyRef
  27. def toString(): String
    Definition Classes
    AnyRef → Any
  28. def transformMessages[Outer](matcher: PartialFunction[Outer, T])(implicit arg0: ClassTag[Outer]): Behavior[Outer]

    Transform the incoming messages by placing a funnel in front of the wrapped Behavior: the supplied PartialFunction decides which message to pull in (those that it is defined at) and may transform the incoming message to place them into the wrapped Behavior’s type hierarchy.

    Transform the incoming messages by placing a funnel in front of the wrapped Behavior: the supplied PartialFunction decides which message to pull in (those that it is defined at) and may transform the incoming message to place them into the wrapped Behavior’s type hierarchy. Signals are not transformed.

    Example:

    val b: Behavior[Number] =
      Behaviors
        .receive[String] { (ctx, msg) =>
          println(msg)
          Behaviors.same
        }
        .transformMessages[Number] {
          case b: BigDecimal => s"BigDecimal($b)"
          case i: BigInt     => s"BigInteger($i)"
          // all other kinds of Number will be `unhandled`
        }

    The ClassTag for Outer ensures that only messages of this class or a subclass thereof will be intercepted. Other message types (e.g. a private protocol) will bypass the interceptor and be continue to the inner behavior untouched.

    Implicit
    This member is added by an implicit conversion from AbstractOnMessageBehavior[T] toBehaviorDecorators[T] performed by method BehaviorDecorators in akka.actor.typed.Behavior.
    Definition Classes
    BehaviorDecorators
  29. final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException])
  30. final def wait(arg0: Long): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException]) @native()
  31. final def wait(): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException])

Deprecated Value Members

  1. def finalize(): Unit
    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.Throwable]) @Deprecated
    Deprecated

    (Since version 9)

  2. def formatted(fmtstr: String): String
    Implicit
    This member is added by an implicit conversion from AbstractOnMessageBehavior[T] toStringFormat[AbstractOnMessageBehavior[T]] performed by method StringFormat in scala.Predef.
    Definition Classes
    StringFormat
    Annotations
    @deprecated @inline()
    Deprecated

    (Since version 2.12.16) Use formatString.format(value) instead of value.formatted(formatString), or use the f"" string interpolator. In Java 15 and later, formatted resolves to the new method in String which has reversed parameters.

  3. def [B](y: B): (AbstractOnMessageBehavior[T], B)
    Implicit
    This member is added by an implicit conversion from AbstractOnMessageBehavior[T] toArrowAssoc[AbstractOnMessageBehavior[T]] performed by method ArrowAssoc in scala.Predef.
    Definition Classes
    ArrowAssoc
    Annotations
    @deprecated
    Deprecated

    (Since version 2.13.0) Use -> instead. If you still wish to display it as one character, consider using a font with programming ligatures such as Fira Code.

Inherited from ExtensibleBehavior[T]

Inherited from Behavior[T]

Inherited from AnyRef

Inherited from Any

Inherited by implicit conversion BehaviorDecorators fromAbstractOnMessageBehavior[T] to BehaviorDecorators[T]

Inherited by implicit conversion any2stringadd fromAbstractOnMessageBehavior[T] to any2stringadd[AbstractOnMessageBehavior[T]]

Inherited by implicit conversion StringFormat fromAbstractOnMessageBehavior[T] to StringFormat[AbstractOnMessageBehavior[T]]

Inherited by implicit conversion Ensuring fromAbstractOnMessageBehavior[T] to Ensuring[AbstractOnMessageBehavior[T]]

Inherited by implicit conversion ArrowAssoc fromAbstractOnMessageBehavior[T] to ArrowAssoc[AbstractOnMessageBehavior[T]]

Ungrouped