StateIterator (Flink : Core API 2.1.2-cp1 API)

Type Parameters:

T - The element type of this iterator.
```
@Experimental
public interface StateIterator<T>
```
Asynchronous iterators allow to iterate over data that comes asynchronously, on-demand.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`boolean`	`isEmpty()`	Return if this iterator is empty synchronously.
`<U> StateFuture<Collection<U>>`	`onNext(FunctionWithException<T,StateFuture<? extends U>,Exception> iterating)`	Async iterate the data and call the callback when data is ready.
`StateFuture<Void>`	`onNext(ThrowingConsumer<T,Exception> iterating)`	Async iterate the data and call the callback when data is ready.

- Method Detail
  - onNext
```
<U> StateFuture<Collection<U>> onNext(FunctionWithException<T,StateFuture<? extends U>,Exception> iterating)
```
    Async iterate the data and call the callback when data is ready.
    
    Type Parameters:
    
    U - the type of the inner returned StateFuture's result.
    
    Parameters:
    
    iterating - the data action when it is ready. The return is the state future for chaining.
    
    Returns:
    
    the Future that will trigger when this iterator and all returned state future get its results.
  - onNext
```
StateFuture<Void> onNext(ThrowingConsumer<T,Exception> iterating)
```
    Async iterate the data and call the callback when data is ready.
    
    Parameters:
    
    iterating - the data action when it is ready.
    
    Returns:
    
    the Future that will trigger when this iterator ends.
  - isEmpty
```
boolean isEmpty()
```
    Return if this iterator is empty synchronously.