Composite ItemProcessor

[luca-vercelli]

I ask if there is any support for composition of many ItemProcessor's into a single chunk. I mean, first processor should take input A and return output B, second processor takes input B and returns C, and so on.

Both Spring Batch [1] and BatchEE [2] support it.

If not, I could provide a PR on this subject.

[1] https://github.com/spring-projects/spring-batch/blob/main/spring-batch-infrastructure/src/main/java/org/springframework/batch/item/support/CompositeItemProcessor.java
[2] https://github.com/apache/geronimo-batchee/blob/master/extensions/extras/src/main/java/org/apache/batchee/extras/chain/