ChronicleMap 和 parallelStream

Question

I'am trying to use chronicleMap.parallelStream:

myChronicleMap.entrySet().parallelStream().forEach((entry) -> {
   process(entry); //heavy process 
}

I got the following exception.

java.lang.IllegalStateException: ChronicleMap ... Iterator should be accessed only from a single thread

Any idea how to use chronicleMap and parallelStream? Thanks

Answer 1

If chronicle does not support parallel streams, then you will have to copy its contents into a map implementation which does.

Map<?, ?> mapCopy = myChronicleMap.entrySet()
                                  .stream()
                                  .collect(Collectors.toMap(Entry::getKey, Entry::getValue));
mapCopy.entrySet().parallelStream().forEach(this::process);