org.springframework.batch.integration.chunk
Interface ChunkHandler<T>

Type Parameters:

T - the type of the items to be processed (it is recommended to use a Memento like a primary key)

All Known Implementing Classes:

ChunkProcessorChunkHandler

public interface ChunkHandler<T>

Interface for a remote worker in the Remote Chunking pattern. A request comes from a master process containing some items to be processed. Once the items are done with a response needs to be generated containing a summary of the result.

Author:

Dave Syer

Method Summary

ChunkResponse

handleChunk(ChunkRequest<T> chunk) Handle the chunk, processing all the items and returning a response summarising the result.

Method Detail

handleChunk

ChunkResponse handleChunk(ChunkRequest<T> chunk)
                          throws Exception

Handle the chunk, processing all the items and returning a response summarising the result. If the result is a failure then the response should say so. The handler only throws an exception if it needs to roll back a transaction and knows that the request will be re-delivered (if not to the same handler then to one processing the same Step).

Parameters:

chunk - a request containing the chunk to process

Returns:

a response summarising the result

Throws:

Exception - if the handler needs to roll back a transaction and have the chunk re-delivered