Is there an elegant way to process a stream in chunks?

Question

My exact scenario is inserting data to database in batches, so I want to accumulate DOM objects then every 1000, flush them.

I implemented it by putting code in the

Answer 1

Using library StreamEx solution would look like

Stream stream = IntStream.iterate(0, i -> i + 1).boxed().limit(15);
AtomicInteger counter = new AtomicInteger(0);
int chunkSize = 4;

StreamEx.of(stream)
        .groupRuns((prev, next) -> counter.incrementAndGet() % chunkSize != 0)
        .forEach(chunk -> System.out.println(chunk));

Output:

[0, 1, 2, 3]
[4, 5, 6, 7]
[8, 9, 10, 11]
[12, 13, 14]

groupRuns accepts predicate that decides whether 2 elements should be in the same group.

It produces a group as soon as it finds first element that does not belong to it.