CallbackContribution

java.lang.Object
- org.apache.hc.core5.concurrent.CallbackContribution<T>

Type Parameters:

T - the future result type of an asynchronous operation.

All Implemented Interfaces:

FutureCallback<T>
```
public abstract class CallbackContribution<T>
extends java.lang.Object
implements FutureCallback<T>
```
Abstracts implementations of FutureCallbacks that contribute a result of the operation to another FutureCallback.

Since:

5.1

- Field Summary
  
  Fields
  Modifier and Type Field Description
  
  private FutureCallback<?> callback
- Constructor Summary
  
  Constructors
  Constructor Description
  
  CallbackContribution(FutureCallback<?> callback)
  Constructs a new instance for a FutureCallback.
- Method Summary
  
  All Methods Instance Methods Concrete Methods
  Modifier and Type Method Description
  
  void cancelled()
  
  void failed(java.lang.Exception ex)
  - Methods inherited from class java.lang.Object
    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
  - Methods inherited from interface org.apache.hc.core5.concurrent.FutureCallback
    completed

- Field Detail
  - callback
```
private final FutureCallback<?> callback
```
- Constructor Detail
  - CallbackContribution
```
public CallbackContribution(FutureCallback<?> callback)
```
    Constructs a new instance for a FutureCallback.
    
    Parameters:
    
    callback - the FutureCallback, may be null.
- Method Detail
  - failed
```
public final void failed(java.lang.Exception ex)
```
    Specified by:
    
    failed in interface FutureCallback<T>
  - cancelled
```
public final void cancelled()
```
    Specified by:
    
    cancelled in interface FutureCallback<T>