流供应商获取错误“流已被操作或关闭”

Question

即使我在我的流中使用Supplier并在每次我想检索我的strem并对其执行终端操作时使用Supplier.get()，我仍然得到“Stream已经被操作或关闭”异常。有人能看看我的代码并建议我做错了什么吗？

引发异常的方法：

private static void printMyDetails(Supplier<Stream<Result>> mySupplier, String myStatus) {
        checkNotNull(mySupplier);
        checkArgument(isNotEmpty(myStatus), "Invalid My status");

        if (mySupplier.get().noneMatch(result -> true)) { //<-This is where the exception is thrown
            if (log.isInfoEnabled()) {
                log.info("Number of My with status '{}': {}", My, 0);
            }
        } else {
            log.info("Number of My with status '{}': {}", myStatus, mySupplier.get().count());
            log.info("Details of My(s) with status: '{}'", myStatus);
            mySupplier.get().sorted().forEach(Utils::printMyNameAndDetails);
        }
    }

rb.keySet().stream().filter(key -> containsIgnoreCase(key, "status")).map(rb::getString)
                .filter(StringUtils::isNotEmpty).forEach(status -> {
            var resultsWithExpectedStatusSupplier = requireNonNull(getResultsWithExpectedStatusSupplier(results, status));
            resultsWithExpectedStatusSupplier.ifPresentOrElse(streamSupplier -> printMyDetails(streamSupplier, status), () -> {
                if (log.isInfoEnabled())
                    log.info("0 My with status: {}", status);
            });
        });

流供应商：

private static Optional<Supplier<Stream<Result>>> getResultsWithExpectedStatusSupplier(
            @NotNull List<Result> results, @NotNull String expectedStatus) {
        checkArgument(!results.isEmpty(), "Results list is empty");
        checkArgument(isNotEmpty(expectedStatus), "Invalid expected status");

        var resultStreamWithExpectedStatus = requireNonNull(results.stream().filter(result -> ofNullable(result).map(Result::getStatus)
                .allMatch(s -> isNotEmpty(s) && s.equalsIgnoreCase(expectedStatus))));
        return resultStreamWithExpectedStatus.count() == 0 ? Optional.empty() : Optional.of(() -> resultStreamWithExpectedStatus);
    }

Answer 1

您可以只使用一次流。看起来供应商总是一次又一次地给出相同的流。在第一终端操作之后，流被排出；来自供应商的流必须一直是一个新的流。