StateUpdater (Storm 2.7.1 API)

All Superinterfaces:

Operation, Serializable
```
public interface StateUpdater<T,S>
extends Operation
```
Interface for updating state.

Method Summary

All Methods Static Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`S`	`apply(S state, T value)`	Returns a new state by applying the value on the current state.
`S`	`init()`	The initial value of the state to start with.
`static <T,S> StateUpdater<T,S>`	`of(S initialValue, BiFunction<? super S,? super T,? extends S> stateUpdateFn)`	A static factory to create a `StateUpdater` based on an initial value of the state and a state update function.

- Method Detail
  - of
```
static <T,S> StateUpdater<T,S> of(S initialValue,
                                              BiFunction<? super S,? super T,? extends S> stateUpdateFn)
```
    A static factory to create a StateUpdater based on an initial value of the state and a state update function.
    
    Parameters:
    
    initialValue - the intial value of the state
    
    stateUpdateFn - the state update function
    
    Returns:
    
    the StateUpdater
  - init
```
S init()
```
    The initial value of the state to start with.
    
    Returns:
    
    the initial value of the state
  - apply
```
S apply(S state,
        T value)
```
    Returns a new state by applying the value on the current state.
    
    Parameters:
    
    state - the current state
    
    value - the value
    
    Returns:
    
    the new state