ResultFuture (Flink : Streaming Java 2.1.0 API)

Type Parameters:

OUT - Output type

All Known Subinterfaces:

StreamElementQueueEntry<OUT>

All Known Implementing Classes:

StreamRecordQueueEntry
```
@PublicEvolving
public interface ResultFuture<OUT>
```
ResultFuture collects data / error in user codes while processing async i/o.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`complete(Collection<OUT> result)`	Completes the result future with a collection of result objects.
`void`	`complete(CollectionSupplier<OUT> supplier)`	The same as complete, but will execute the supplier on the Mailbox thread which initiated the asynchronous process.
`void`	`completeExceptionally(Throwable error)`	Completes the result future exceptionally with an exception.

- Method Detail
  - complete
```
void complete(Collection<OUT> result)
```
    Completes the result future with a collection of result objects.
    Note that it should be called for exactly one time in the user code. Calling this function for multiple times will cause data lose.
    Put all results in a Collection and then emit output.
    
    Parameters:
    
    result - A list of results.
  - completeExceptionally
```
void completeExceptionally(Throwable error)
```
    Completes the result future exceptionally with an exception.
    
    Parameters:
    
    error - A Throwable object.
  - complete
```
void complete(CollectionSupplier<OUT> supplier)
```
    The same as complete, but will execute the supplier on the Mailbox thread which initiated the asynchronous process.
    Note that if an exception is thrown while executing the supplier, the result should be the same as calling completeExceptionally(Throwable).