org.springframework.batch.item.support
Class DelegatingItemReader

java.lang.Object
  org.springframework.batch.item.AbstractItemReader
      org.springframework.batch.item.support.DelegatingItemReader

All Implemented Interfaces:

ItemReader, InitializingBean

Direct Known Subclasses:

AggregateItemReader, ValidatingItemReader

public class DelegatingItemReader
extends AbstractItemReader
implements InitializingBean

Simple wrapper around ItemReader. The input source is expected to take care of open and close operations. If necessary it should be registered as a step scoped bean to ensure that the lifecycle methods are called.

Author:

Dave Syer

Constructor Summary

DelegatingItemReader()
Default constructor.

DelegatingItemReader(ItemReader itemReader)
Convenience constructor for setting mandatory property.

Method Summary

void	afterPropertiesSet()
void	mark() Mark the stream so that it can be reset later and the items backed out. Mark is called before reading a new chunk of items - in case of rollback mark will not be called again before re-processing the chunk. In a multi-threaded setting implementations have to ensure that only the state from the current thread is saved.
Object	read() Get the next object from the input source.
void	reset() Reset the stream to the last mark.
void	setItemReader(ItemReader source) Setter for input source.

Methods inherited from class java.lang.Object

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

Constructor Detail

DelegatingItemReader

public DelegatingItemReader()

Default constructor.

DelegatingItemReader

public DelegatingItemReader(ItemReader itemReader)

Convenience constructor for setting mandatory property.

Method Detail

afterPropertiesSet

public void afterPropertiesSet()
                        throws Exception

Specified by:

afterPropertiesSet in interface InitializingBean

Throws:

Exception

read

public Object read()
            throws Exception

Get the next object from the input source.

Specified by:

read in interface ItemReader

Throws:

Exception

See Also:

ItemReader.read()

setItemReader

public void setItemReader(ItemReader source)

Setter for input source.

Parameters:

source -

mark

public void mark()

Description copied from interface: ItemReader

Mark the stream so that it can be reset later and the items backed out.
Mark is called before reading a new chunk of items - in case of rollback mark will not be called again before re-processing the chunk.
In a multi-threaded setting implementations have to ensure that only the state from the current thread is saved.

Specified by:

mark in interface ItemReader

Overrides:

mark in class AbstractItemReader

reset

public void reset()

Description copied from interface: ItemReader

Reset the stream to the last mark. After a reset the stream state will be such that changes (items read or written) since the last call to mark will not be visible after a call to close.
In a multi-threaded setting implementations have to ensure that only the state from the current thread is reset.

Specified by:

reset in interface ItemReader

Overrides:

reset in class AbstractItemReader