java.lang.Object
- org.springframework.batch.sample.common.StagingItemReader<T>

所有已实现的接口:
StepExecutionListener, StepListener, ItemReader<ProcessIndicatorItemWrapper<T>>, org.springframework.beans.factory.DisposableBean, org.springframework.beans.factory.InitializingBean
```
public class StagingItemReader<T>
extends java.lang.Object
implements ItemReader<ProcessIndicatorItemWrapper<T>>, StepExecutionListener, org.springframework.beans.factory.InitializingBean, org.springframework.beans.factory.DisposableBean
```
Thread-safe database ItemReader implementing the process indicator pattern. To achieve restartability use together with StagingItemProcessor.

构造器概要
构造器
构造器说明
StagingItemReader()

方法概要

所有方法实例方法具体方法
修饰符和类型	方法	说明
`void`	`afterPropertiesSet()`
`ExitStatus`	`afterStep(StepExecution stepExecution)`	Give a listener a chance to modify the exit status from a step.
`void`	`beforeStep(StepExecution stepExecution)`	Initialize the state of the listener with the `StepExecution` from the current scope.
`void`	`destroy()`
`ProcessIndicatorItemWrapper<T>`	`read()`	Reads a piece of input data and advance to the next one.
`void`	`setDataSource(javax.sql.DataSource dataSource)`

从类继承的方法 java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- 构造器详细资料
  - StagingItemReader
```
public StagingItemReader()
```
- 方法详细资料
  - setDataSource
```
public void setDataSource(javax.sql.DataSource dataSource)
```
  - destroy
```
public void destroy()
             throws java.lang.Exception
```
    指定者:
    destroy 在接口中 org.springframework.beans.factory.DisposableBean
    抛出:
    java.lang.Exception
  - afterPropertiesSet
```
public final void afterPropertiesSet()
                              throws java.lang.Exception
```
    指定者:
    afterPropertiesSet 在接口中 org.springframework.beans.factory.InitializingBean
    抛出:
    java.lang.Exception
  - read
```
public ProcessIndicatorItemWrapper<T> read()
```
    从接口复制的说明: ItemReader
    Reads a piece of input data and advance to the next one. Implementations must return null at the end of the input data set. In a transactional setting, caller might get the same item twice from successive calls (or otherwise), if the first call was in a transaction that rolled back.
    指定者:
    read 在接口中 ItemReader<T>
    返回:
    T the item to be processed or null if the data source is exhausted
  - afterStep
```
public ExitStatus afterStep(StepExecution stepExecution)
```
    从接口复制的说明: StepExecutionListener
    Give a listener a chance to modify the exit status from a step. The value returned will be combined with the normal exit status using ExitStatus.and(ExitStatus). Called after execution of step's processing logic (both successful or failed). Throwing exception in this method has no effect, it will only be logged.
    指定者:
    afterStep 在接口中 StepExecutionListener
    参数:
    stepExecution - StepExecution instance.
    返回:
    an ExitStatus to combine with the normal value. Return null to leave the old value unchanged.
  - beforeStep
```
public void beforeStep(StepExecution stepExecution)
```
    从接口复制的说明: StepExecutionListener
    Initialize the state of the listener with the StepExecution from the current scope.
    指定者:
    beforeStep 在接口中 StepExecutionListener
    参数:
    stepExecution - instance of StepExecution.

类 StagingItemReader<T>

构造器概要

方法概要

从类继承的方法 java.lang.Object

构造器详细资料

StagingItemReader

方法详细资料

setDataSource

destroy

afterPropertiesSet

read

afterStep

beforeStep