Package org.springframework.batch.item.support

Class SynchronizedItemReader<T>

java.lang.Object

org.springframework.batch.item.support.SynchronizedItemReader<T>

Type Parameters:

T - type of objects to read

All Implemented Interfaces:

ItemReader<T>

public class SynchronizedItemReader<T>
extends Object
implements ItemReader<T>

This is an ItemReader decorator with a synchronized ItemReader.read() method. This decorator is useful when using a non thread-safe item reader in a multi-threaded step.

Since:

5.1.0

Author:

Mahmoud Ben Hassine

Constructor Summary

Constructors

Constructor	Description
SynchronizedItemReader(ItemReader<T> delegate)

Method Summary

Modifier and Type	Method	Description
T	read()	This method delegates to the read method of the delegate and is synchronized with a lock.

Methods inherited from class java.lang.Object

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

Constructor Details

SynchronizedItemReader

public SynchronizedItemReader(ItemReader<T> delegate)

Method Details

read

@Nullable
public T read()
       throws Exception

This method delegates to the read method of the delegate and is synchronized with a lock.

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.

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