Currently, when the stream holds a resource, it's necessary to wrap it with
try-with-resources. This undermines the compact and fluent style of stream API
calls. For example, if we want to get the `List` of files inside the directory
and timely close the underlying filehandle, we should use something like this:
List<Path> paths;
try (Stream<Path> stream = Files.list(Path.of("/etc"))) {
paths = stream.toList();
}
// use paths
I suggest to add a new default method to Stream interface named
`consumeAndClose`, which allows performing terminal stream operation and
closing the stream at the same time. It may look like this:
default <R> R consumeAndClose(Function<? super Stream<T>, ? extends R>
function) {
Objects.requireNonNull(function);
try(this) {
return function.apply(this);
}
}
Now, it will be possible to get the list of the files in the fluent manner:
List<Path> list = Files.list(Path.of("/etc")).consumeAndClose(Stream::toList);
-------------
Commit messages:
- Fix tests
- 8274412: Add a method to Stream API to consume and close the stream without
using try-with-resources
Changes: https://git.openjdk.java.net/jdk/pull/5796/files
Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5796&range=00
Issue: https://bugs.openjdk.java.net/browse/JDK-8274412
Stats: 140 lines in 5 files changed: 135 ins; 0 del; 5 mod
Patch: https://git.openjdk.java.net/jdk/pull/5796.diff
Fetch: git fetch https://git.openjdk.java.net/jdk pull/5796/head:pull/5796
PR: https://git.openjdk.java.net/jdk/pull/5796
