On Thu, 30 Nov 2023 17:24:47 GMT, Brian Burkhalter <b...@openjdk.org> wrote:
>> What do you think of adding `OutputStream extends WritableByteChannel`, so
>> `transferTo` could be implemented with `if (target instanceof
>> WritableByteChannel) { target.write(ByteBuffer.wrap(buf, off,
>> len).asReadOnly()); }`?
>>
>> Read-only byte buffer will not allow modifying the data in the buffer, it
>> would eliminate buffer copies, and adding `write(ByteBuffer)` to
>> `OutputStream` seems reasonable.
>
>> It could be special cased for trusted targets but at the cost of auditing
>> and complexity. So more thought needed on this [...]
>
> Could the target additionally be checked to see whether it is a
> `FilterOutputStream` and if so not be trusted?
> What do you think of adding `OutputStream extends WritableByteChannel`, so
> `transferTo` could be implemented with `if (target instanceof
> WritableByteChannel) { target.write(ByteBuffer.wrap(buf, off,
> len).asReadOnly()); }`?
Interesting but I don't think that is workable as WBC specifies that writes
executing serially and also specifies the exception when attempting to write to
a closed channel, both of which are not compatible with OutputStream.
In any case, it doesn't solve the second part of the concern which is read-only
view on the internal buffer.
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PR Review Comment: https://git.openjdk.org/jdk/pull/16879#discussion_r1413859006
