trait AsyncCallback[T] extends AnyRef
An asynchronous callback holder that is attached to a GraphStageLogic. Initializing AsyncCallback#invoke will eventually lead to the registered handler being called.
This holder has the same lifecycle as a stream and cannot be used before materialization is done.
Typical use cases are exchanging messages between stream and substreams or invoking from external world sending event to a stream
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- GraphStage.scala
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Abstract Value Members
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abstract
def
invoke(t: T): Unit
Dispatch an asynchronous notification.
Dispatch an asynchronous notification. This method is thread-safe and may be invoked from external execution contexts.
For cases where it is important to know if the notification was ever processed or not see [AsyncCallback#invokeWithFeedback]]
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abstract
def
invokeWithFeedback(t: T): Future[Done]
Dispatch an asynchronous notification.
Dispatch an asynchronous notification. This method is thread-safe and may be invoked from external execution contexts.
The method returns directly and the returned future is then completed once the event has been handled by the operator, if the event triggers an exception from the handler the future is failed with that exception and finally if the operator was stopped before the event has been handled the future is failed with
StreamDetachedException
.The handling of the returned future incurs a slight overhead, so for cases where it does not matter to the invoking logic see AsyncCallback#invoke
Concrete Value Members
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final
def
!=(arg0: Any): Boolean
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final
def
##(): Int
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def
+(other: String): String
- Implicit
- This member is added by an implicit conversion from AsyncCallback[T] to any2stringadd[AsyncCallback[T]] performed by method any2stringadd in scala.Predef.
- Definition Classes
- any2stringadd
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def
->[B](y: B): (AsyncCallback[T], B)
- Implicit
- This member is added by an implicit conversion from AsyncCallback[T] to ArrowAssoc[AsyncCallback[T]] performed by method ArrowAssoc in scala.Predef.
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final
def
==(arg0: Any): Boolean
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final
def
asInstanceOf[T0]: T0
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def
clone(): AnyRef
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def
ensuring(cond: (AsyncCallback[T]) ⇒ Boolean, msg: ⇒ Any): AsyncCallback[T]
- Implicit
- This member is added by an implicit conversion from AsyncCallback[T] to Ensuring[AsyncCallback[T]] performed by method Ensuring in scala.Predef.
- Definition Classes
- Ensuring
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def
ensuring(cond: (AsyncCallback[T]) ⇒ Boolean): AsyncCallback[T]
- Implicit
- This member is added by an implicit conversion from AsyncCallback[T] to Ensuring[AsyncCallback[T]] performed by method Ensuring in scala.Predef.
- Definition Classes
- Ensuring
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def
ensuring(cond: Boolean, msg: ⇒ Any): AsyncCallback[T]
- Implicit
- This member is added by an implicit conversion from AsyncCallback[T] to Ensuring[AsyncCallback[T]] performed by method Ensuring in scala.Predef.
- Definition Classes
- Ensuring
-
def
ensuring(cond: Boolean): AsyncCallback[T]
- Implicit
- This member is added by an implicit conversion from AsyncCallback[T] to Ensuring[AsyncCallback[T]] performed by method Ensuring in scala.Predef.
- Definition Classes
- Ensuring
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final
def
eq(arg0: AnyRef): Boolean
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- AnyRef
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def
equals(arg0: Any): Boolean
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def
formatted(fmtstr: String): String
- Implicit
- This member is added by an implicit conversion from AsyncCallback[T] to StringFormat[AsyncCallback[T]] performed by method StringFormat in scala.Predef.
- Definition Classes
- StringFormat
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final
def
getClass(): Class[_]
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def
hashCode(): Int
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final
def
isInstanceOf[T0]: Boolean
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final
def
ne(arg0: AnyRef): Boolean
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final
def
notify(): Unit
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final
def
notifyAll(): Unit
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final
def
synchronized[T0](arg0: ⇒ T0): T0
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def
toString(): String
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final
def
wait(arg0: Long, arg1: Int): Unit
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final
def
wait(arg0: Long): Unit
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final
def
wait(): Unit
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def
→[B](y: B): (AsyncCallback[T], B)
- Implicit
- This member is added by an implicit conversion from AsyncCallback[T] to ArrowAssoc[AsyncCallback[T]] performed by method ArrowAssoc in scala.Predef.
- Definition Classes
- ArrowAssoc