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[FLINK-7547][build] AsyncFunction.scala extends Function, serialized #4614

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[FLINK-7547][build] AsyncFunction.scala extends Function, serialized #4614

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7 changes: 4 additions & 3 deletions ...aming-scala/src/main/scala/org/apache/flink/streaming/api/scala/async/AsyncFunction.scala
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Expand Up @@ -19,6 +19,7 @@
package org.apache.flink.streaming.api.scala.async

import org.apache.flink.annotation.PublicEvolving
import org.apache.flink.api.common.functions.Function

/**
* A function to trigger async I/O operations.
Expand All @@ -32,16 +33,16 @@ import org.apache.flink.annotation.PublicEvolving
* An error can also be propagate to the async IO operator by
* [[ResultFuture.completeExceptionally(Throwable)]].
*
* @tparam IN The type of the input element
* @tparam IN The type of the input element
* @tparam OUT The type of the output elements
*/
@PublicEvolving
trait AsyncFunction[IN, OUT] {
trait AsyncFunction[IN, OUT] extends Function {

/**
* Trigger the async operation for each stream input
*
* @param input element coming from an upstream task
* @param input element coming from an upstream task
* @param resultFuture to be completed with the result data
*/
def asyncInvoke(input: IN, resultFuture: ResultFuture[OUT]): Unit
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