The flat file integration pattern is similar to database integration; however, instead of having a database to integrate two components, it suggests using flat files. The updates, inserts, and polling are needed just as we would in another pattern, but this is a little more flexible. However, this comes with some disadvantages like managing the file formats, concurrency, and locks, among other things, would need more involvement and effort, leading to scalability and reliability issues.
This diagram is the sample implementation for flat file integration and involves polling, update, and delete.
