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View Code? Open in Web Editor NEWA simple Result type in Java for functional exception handling.
License: MIT License
A simple Result type in Java for functional exception handling.
License: MIT License
hi,
I'm trying to learn java and i found your article very interesting and useful, able to solve in a clear and simple way what seems to me a deficiency in the current implementation of java.
By trying to use the library I noticed that the characteristics of ResultCollector
were not specified.
public Set<Characteristics> characteristics() { return Set.of(); }
So I tried to verify its behavior with a parallel stream and I noticed a wrong result.
@Test
void collectorSyncronization() {
Supplier<Integer> fn = () -> new Random().nextInt(10);
// ok this is std collector
assertDoesNotThrow(() -> Stream.generate(fn).parallel().limit(100).collect(Collectors.toList()));
// trying the same with a CheckedSupplier and a Result
Supplier<Result<Integer,Exception>> randomNumbersSupp=() -> Result.attempt(() -> fn.get());
Stream<Result<Integer,Exception>> streamOfValues = Stream.generate(randomNumbersSupp)
.limit(100);
// with a serial stream all is ok
List<Integer> values = assertDoesNotThrow( () ->
streamOfValues
.collect(new ResultCollector<>())
.getValue().get()
);
// with a parallelStream something go wrong
assertThrows( Exception.class, () ->
streamOfValues
.parallel()
.collect(new ResultCollector<>())
.getValue().get()
);
}
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