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
- Source
- GraphStage.scala
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Abstract Value Members
- 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
- 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
- final def !=(arg0: Any): Boolean
- Definition Classes
- AnyRef → Any
- final def ##: Int
- Definition Classes
- AnyRef → Any
- def +(other: String): String
- Implicit
- This member is added by an implicit conversion from AsyncCallback[T] toany2stringadd[AsyncCallback[T]] performed by method any2stringadd in scala.Predef.
- Definition Classes
- any2stringadd
- def ->[B](y: B): (AsyncCallback[T], B)
- Implicit
- This member is added by an implicit conversion from AsyncCallback[T] toArrowAssoc[AsyncCallback[T]] performed by method ArrowAssoc in scala.Predef.
- Definition Classes
- ArrowAssoc
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- @inline()
- final def ==(arg0: Any): Boolean
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- final def asInstanceOf[T0]: T0
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- Any
- def clone(): AnyRef
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- protected[lang]
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- @throws(classOf[java.lang.CloneNotSupportedException]) @HotSpotIntrinsicCandidate() @native()
- def ensuring(cond: (AsyncCallback[T]) => Boolean, msg: => Any): AsyncCallback[T]
- Implicit
- This member is added by an implicit conversion from AsyncCallback[T] toEnsuring[AsyncCallback[T]] performed by method Ensuring in scala.Predef.
- Definition Classes
- Ensuring
- def ensuring(cond: (AsyncCallback[T]) => Boolean): AsyncCallback[T]
- Implicit
- This member is added by an implicit conversion from AsyncCallback[T] toEnsuring[AsyncCallback[T]] performed by method Ensuring in scala.Predef.
- Definition Classes
- Ensuring
- def ensuring(cond: Boolean, msg: => Any): AsyncCallback[T]
- Implicit
- This member is added by an implicit conversion from AsyncCallback[T] toEnsuring[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] toEnsuring[AsyncCallback[T]] performed by method Ensuring in scala.Predef.
- Definition Classes
- Ensuring
- final def eq(arg0: AnyRef): Boolean
- Definition Classes
- AnyRef
- def equals(arg0: AnyRef): Boolean
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- AnyRef → Any
- final def getClass(): Class[_ <: AnyRef]
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- @HotSpotIntrinsicCandidate() @native()
- def hashCode(): Int
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- @HotSpotIntrinsicCandidate() @native()
- final def isInstanceOf[T0]: Boolean
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- Any
- final def ne(arg0: AnyRef): Boolean
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- AnyRef
- final def notify(): Unit
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- @HotSpotIntrinsicCandidate() @native()
- final def notifyAll(): Unit
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- @HotSpotIntrinsicCandidate() @native()
- final def synchronized[T0](arg0: => T0): T0
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- AnyRef
- def toString(): String
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- AnyRef → Any
- final def wait(arg0: Long, arg1: Int): Unit
- Definition Classes
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- @throws(classOf[java.lang.InterruptedException])
- final def wait(arg0: Long): Unit
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- final def wait(): Unit
- Definition Classes
- AnyRef
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- @throws(classOf[java.lang.InterruptedException])
Deprecated Value Members
- def finalize(): Unit
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- protected[lang]
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- AnyRef
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- @throws(classOf[java.lang.Throwable]) @Deprecated
- Deprecated
(Since version 9)
- def formatted(fmtstr: String): String
- Implicit
- This member is added by an implicit conversion from AsyncCallback[T] toStringFormat[AsyncCallback[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 ofvalue.formatted(formatString), or use thef""string interpolator. In Java 15 and later,formattedresolves to the new method in String which has reversed parameters.
- def →[B](y: B): (AsyncCallback[T], B)
- Implicit
- This member is added by an implicit conversion from AsyncCallback[T] toArrowAssoc[AsyncCallback[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.