Spring批处理MultiResourceItemReader-仅用于合并文件？

Question

I have a Spring batch operation where I have sources file1 , file2 and file3 to read from, and want to write to fileA , fileB and fileC like the following:

file1->fileA
file2->fileB
file3->fileC

When I look at an example for MultiResourceItemReader it implies that the [MultiResourceItemReader][2] is useful for combining operations - but not pipelining parallel operations. ie the usage pattern of MultiResourceItemReader is for appending:

file1->file2->file3->fileC

If I want to read a sequence of files as separate operations- is MultiResourceItemReader still the way to go?

Answer 1

您可以使用multiresourceparitioner，它是并行和异步的，请在这里参考spring batch示例程序

Answer 2

MultiResourceItemReader:
Reads items from multiple resources sequentially - resource list is given by setResources(Resource[]), the actual reading is delegated to setDelegate(ResourceAwareItemReaderItemStream).
So the job of MultiResourceItemReader is correctly done.
The problem is after delegating reading to the actual reader.