Package org.springframework.batch.item.avro

Class AvroItemReader<T>

java.lang.Object

org.springframework.batch.item.ItemStreamSupport

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

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

org.springframework.batch.item.avro.AvroItemReader<T>

All Implemented Interfaces:

ItemReader<T>, ItemStream, ItemStreamReader<T>

public class AvroItemReader<T>
extends AbstractItemCountingItemStreamItemReader<T>

An ItemReader that deserializes data from a Resource containing serialized Avro objects.

This reader is not thread-safe.

Since:

4.2

Author:

David Turanski, Mahmoud Ben Hassine, Song JaeGeun

Constructor Summary

Constructors

Constructor	Description
AvroItemReader(org.springframework.core.io.Resource resource, Class<T> clazz)
AvroItemReader(org.springframework.core.io.Resource data, org.springframework.core.io.Resource schema)

Method Summary

Modifier and Type	Method	Description
protected void	doClose()	Close the resources opened in AbstractItemCountingItemStreamItemReader.doOpen().
protected void	doOpen()	Open resources necessary to start reading input.
protected T	doRead()	Read next item from input.
void	setEmbeddedSchema(boolean embeddedSchema)	Disable or enable reading an embedded Avro schema.

Methods inherited from class org.springframework.batch.item.support.AbstractItemCountingItemStreamItemReader

close, getCurrentItemCount, isSaveState, jumpToItem, open, read, setCurrentItemCount, setMaxItemCount, setSaveState, update

Methods inherited from class org.springframework.batch.item.ItemStreamSupport

getExecutionContextKey, getName, setExecutionContextName, setName

Methods inherited from class java.lang.Object

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

Constructor Details

AvroItemReader

public AvroItemReader(org.springframework.core.io.Resource resource,
 Class<T> clazz)

Parameters:

resource - the Resource containing objects serialized with Avro.

clazz - the data type to be deserialized.

AvroItemReader

public AvroItemReader(org.springframework.core.io.Resource data,
 org.springframework.core.io.Resource schema)

Parameters:

data - the Resource containing the data to be read.

schema - the Resource containing the Avro schema.

Method Details

setEmbeddedSchema

public void setEmbeddedSchema(boolean embeddedSchema)

Disable or enable reading an embedded Avro schema. True by default.

Parameters:

embeddedSchema - set to false to if the input does not embed an Avro schema.

doRead

@Nullable
protected T doRead()
            throws Exception

Description copied from class: AbstractItemCountingItemStreamItemReader

Read next item from input.

Specified by:

doRead in class AbstractItemCountingItemStreamItemReader<T>

Returns:

an item or null if the data source is exhausted

Throws:

Exception - Allows subclasses to throw checked exceptions for interpretation by the framework

doOpen

protected void doOpen()
               throws Exception

Description copied from class: AbstractItemCountingItemStreamItemReader

Open resources necessary to start reading input.

Specified by:

doOpen in class AbstractItemCountingItemStreamItemReader<T>

Throws:

Exception - Allows subclasses to throw checked exceptions for interpretation by the framework

doClose

protected void doClose()
                throws Exception

Description copied from class: AbstractItemCountingItemStreamItemReader

Close the resources opened in AbstractItemCountingItemStreamItemReader.doOpen().

Specified by:

doClose in class AbstractItemCountingItemStreamItemReader<T>

Throws:

Exception - Allows subclasses to throw checked exceptions for interpretation by the framework