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

All Implemented Interfaces:
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.

Constructor Summary
Constructors
Constructor Description
StagingItemReader()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`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)`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - StagingItemReader
```
public StagingItemReader()
```
- Method Detail
  - setDataSource
```
public void setDataSource(javax.sql.DataSource dataSource)
```
  - destroy
```
public void destroy()
             throws java.lang.Exception
```
    Specified by:
    destroy in interface org.springframework.beans.factory.DisposableBean
    Throws:
    java.lang.Exception
  - afterPropertiesSet
```
public final void afterPropertiesSet()
                              throws java.lang.Exception
```
    Specified by:
    afterPropertiesSet in interface org.springframework.beans.factory.InitializingBean
    Throws:
    java.lang.Exception
  - read
```
public ProcessIndicatorItemWrapper<T> read()
```
    Description copied from interface: 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.
    Specified by:
    read in interface ItemReader<T>
    Returns:
    T the item to be processed or null if the data source is exhausted
  - afterStep
```
public ExitStatus afterStep(StepExecution stepExecution)
```
    Description copied from interface: 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.
    Specified by:
    afterStep in interface StepExecutionListener
    Parameters:
    stepExecution - StepExecution instance.
    Returns:
    an ExitStatus to combine with the normal value. Return null to leave the old value unchanged.
  - beforeStep
```
public void beforeStep(StepExecution stepExecution)
```
    Description copied from interface: StepExecutionListener
    Initialize the state of the listener with the StepExecution from the current scope.
    Specified by:
    beforeStep in interface StepExecutionListener
    Parameters:
    stepExecution - instance of StepExecution.

Class StagingItemReader<T>

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

StagingItemReader

Method Detail

setDataSource

destroy

afterPropertiesSet

read

afterStep

beforeStep