Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Welcome To Ask or Share your Answers For Others

Categories

0 votes
1.3k views
in Technique[技术] by (71.8m points)

spring batch - How to set max no of records read in flatfileItemReader?

My application needs only fixed no of records to be read & processed. How to limit this if I am using a flatfileItemReader ? In DB based Item Reader, I am returning null/empty list when max_limit is reached. How to achieve the same if I am using a org.springframework.batch.item.file.FlatFileItemReader ?

See Question&Answers more detail:os

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome To Ask or Share your Answers For Others

1 Reply

0 votes
by (71.8m points)

For the FlatFileItemReader as well as any other ItemReader that extends AbstractItemCountingItemStreamItemReader, there is a maxItemCount property. By configuring this property, the ItemReader will continue to read until either one of the following conditions has been met:

  1. The input has been exhausted.
  2. The number of items read equals the maxItemCount.

In either of the two above conditions, null will be returned by the reader, indicating to Spring Batch that the input is complete.

If you have any custom ItemReader implementations that need to satisfy this requirement, I'd recommend extending the AbstractItemCountingItemStreamItemReader and going from there.


与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
OGeek|极客中国-欢迎来到极客的世界,一个免费开放的程序员编程交流平台!开放,进步,分享!让技术改变生活,让极客改变未来! Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Click Here to Ask a Question

...