On Fri, 18 Jul 2025 09:44:35 GMT, Volkan Yazici <vyaz...@openjdk.org> wrote:
>> Adds a new `ofFileChannel(FileChannel channel, long offset, long length)`
>> method to `java.net.HttpRequest.BodyPublishers` to provide an `HttpClient`
>> publisher to upload a certain region of a file. The new publisher does not
>> modify the state of the passed `FileChannel`, streams the file channel bytes
>> as it publishes (i.e., avoids reading the entire file into the memory), and
>> can be leveraged to implement sliced uploads. As noted in the Javadoc:
>>
>>> The file channel will not be closed upon completion. The caller is
>>> expected to manage the life cycle of the channel, and close it
>>> appropriately when not needed anymore.
>>
>> ### Implementation notes
>>
>> - `FileChannel` is preferred over `{Readable,Seekable}ByteChannel`, since
>> the latter does not provide a positional read without modifying the state of
>> the `FileChannel`, which is necessary to use a single `FileChannel` instance
>> to implement sliced uploads.
>> - `ofFileChannel(FileChannel,long,long)` is preferred over
>> `ofPath(Path,long,long)` to avoid overloading the maximum file descriptor
>> limit of the platform.
>
> Volkan Yazici has updated the pull request incrementally with six additional
> commits since the last revision:
>
> - Fix typo in `Utils::getBufferWithAtMost` Javadoc
> - Link to `BUFSIZE` in `Utils::getBuffer` Javadoc
> - Improve wording for signaling request cancellation
> - Remove synchronization for `FileChannelIterator`
> - Improve exception handling and documentation for `ofFileChannel`
> - Add `@since 26` to `ofFileChannel`
test/jdk/java/net/httpclient/FileChannelPublisherTest.java line 514:
> 512: Exception requestFailure =
> assertThrows(ExecutionException.class, () -> responseFutureRef.get().get());
> 513: assertInstanceOf(UncheckedIOException.class,
> requestFailure.getCause());
> 514: assertInstanceOf(ClosedChannelException.class,
> requestFailure.getCause().getCause());
Nit - the `assertInstanceOf(...)` returns the instance of the exception which
matches the instanceof check. So it might be easier to understand while reading
this code, if we did something like:
final IOException ioe = assertInstanceOf(IOException.class,
requestFailure.getCause());
assertInstanceOf(ClosedChannelException.class, ioe.getCause());
-------------
PR Review Comment: https://git.openjdk.org/jdk/pull/26155#discussion_r2235118335
