IN
- The type of the input elements.OUT
- The type of the returned elements.@PublicEvolving public interface AsyncFunction<IN,OUT> extends Function, Serializable
For each #asyncInvoke, an async io operation can be triggered, and once it has been done,
the result can be collected by calling AsyncCollector.collect(java.util.Collection<OUT>)
. For each async
operation, its context is stored in the operator immediately after invoking
#asyncInvoke, avoiding blocking for each stream input as long as the internal buffer is not full.
AsyncCollector
can be passed into callbacks or futures to collect the result data.
An error can also be propagate to the async IO operator by
AsyncCollector.collect(Throwable)
.
Callback example usage:
{@code public class HBaseAsyncFunc implements AsyncFunction{
Modifier and Type | Method and Description |
---|---|
void |
asyncInvoke(IN input,
AsyncCollector<OUT> collector)
Trigger async operation for each stream input.
|
void asyncInvoke(IN input, AsyncCollector<OUT> collector) throws Exception
input
- element coming from an upstream taskcollector
- to collect the result dataException
- in case of a user code error. An exception will make the task fail and
trigger fail-over process.Copyright © 2014–2017 The Apache Software Foundation. All rights reserved.