org.springframework.batch.sample.support

Class ExceptionThrowingItemReaderProxy<T>

java.lang.Object

org.springframework.batch.sample.support.ExceptionThrowingItemReaderProxy<T>

All Implemented Interfaces:

ItemReader<T>

public class ExceptionThrowingItemReaderProxy<T>
extends java.lang.Object
implements ItemReader<T>

Hacked ItemReader that throws exception on a given record number (useful for testing restart).

Author:

Robert Kasanicky, Lucas Ward

Constructor Summary

Constructors

Constructor and Description
ExceptionThrowingItemReaderProxy()

Method Summary

Modifier and Type	Method and Description
T	read() Reads a piece of input data and advance to the next one.
void	setDelegate(ItemReader<T> delegate)
void	setThrowExceptionOnRecordNumber(int throwExceptionOnRecordNumber)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ExceptionThrowingItemReaderProxy

public ExceptionThrowingItemReaderProxy()

Method Detail

setThrowExceptionOnRecordNumber

public void setThrowExceptionOnRecordNumber(int throwExceptionOnRecordNumber)

Parameters:

throwExceptionOnRecordNumber - The number of record on which exception should be thrown

read

public T read()
       throws java.lang.Exception

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

Throws:

ParseException - if there is a problem parsing the current record (but the next one may still be valid)

NonTransientResourceException - if there is a fatal exception in the underlying resource. After throwing this exception implementations should endeavour to return null from subsequent calls to read.

UnexpectedInputException - if there is an uncategorised problem with the input data. Assume potentially transient, so subsequent calls to read might succeed.

java.lang.Exception - if an there is a non-specific error.

setDelegate

public void setDelegate(ItemReader<T> delegate)