ItemProcessListener (Spring Batch 4.1.4.RELEASE API)

所有超级接口:
StepListener
所有已知实现类:
CompositeItemProcessListener, DefaultItemFailureHandler, ItemListenerSupport, ItemProcessListenerAdapter, MulticasterBatchListener, StagingItemListener, StepListenerSupport
```
public interface ItemProcessListener<T,S>
extends StepListener
```
Listener interface for the processing of an item. Implementations of this interface will be notified before and after an item is passed to the ItemProcessor and in the event of any exceptions thrown by the processor.
作者:
Dave Syer, Mahmoud Ben Hassine

方法概要

所有方法实例方法抽象方法
修饰符和类型	方法	说明
`void`	`afterProcess(T item, S result)`	Called after `ItemProcessor.process(Object)` returns.
`void`	`beforeProcess(T item)`	Called before `ItemProcessor.process(Object)`.
`void`	`onProcessError(T item, java.lang.Exception e)`	Called if an exception was thrown from `ItemProcessor.process(Object)`.

- 方法详细资料
  - beforeProcess
```
void beforeProcess(T item)
```
    Called before ItemProcessor.process(Object).
    参数:
    item - to be processed.
  - afterProcess
```
void afterProcess(T item,
                  @Nullable
                  S result)
```
    Called after ItemProcessor.process(Object) returns. If the processor returns null, this method will still be called, with a {code null} result, allowing for notification of 'filtered' items.
    参数:
    item - to be processed
    result - of processing
  - onProcessError
```
void onProcessError(T item,
                    java.lang.Exception e)
```
    Called if an exception was thrown from ItemProcessor.process(Object).
    参数:
    item - attempted to be processed
    e - - exception thrown during processing.