Package 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 Detail

      • handleChunk

        ChunkResponse handleChunk​(ChunkRequest<T> chunk)
                   throws java.lang.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:
        java.lang.Exception - if the handler needs to roll back a transaction and have the chunk re-delivered