[undertow-dev] Async sending of NIO objects thru a ServletOutputStream?

[Stuart Douglas]

Jim Crossley wrote:
> I actually figured that out, Stuart, thanks. So I have writing a
> ByteBuffer covered. Any thoughts on handling the ReadableByteChannel?
> Looking at the Jetty impl, it appears I need to read it into one or more
> ByteBuffers and then write them out. Should I use the Pooled<ByteBuffer>
> from the exhange's connection?

Yea, we don't have an easy way to just do that transfer at this stage, 
you will need to read into the pooled buffer then write it out.

Is this an async or a blocking transfer? The problem with 
ReadableByteChannel is that it can be a blocking channel, and as a 
result reading from it in the IO thread will result in crappy performance.

Stuart

>
> Jim
>
> On Tue, Sep 16, 2014 at 6:00 PM, Stuart Douglas <sdouglas at redhat.com
> <mailto:sdouglas at redhat.com>> wrote:
>
>
>
>     Jim Crossley wrote:
>
>         Hi guys,
>
>         I'm looking to promote Undertow as a preferred alternative to
>         Jetty for
>         the Pedestal [1] framework.
>
>         One Jetty feature it relies on is the async sending of
>         ByteBuffers and
>         ReadableByteChannels in Jetty's impl of ServletOutputStream [2]. Two
>         methods, in particular: sendContent(ByteBuffer, Callback) and
>         sendContent(__ReadableByteChannel, Callback).
>
>
>     If you have enabled async mode on the ServletOutputStream then
>     write(ByteBuffer) will write using async IO, and invoke the write
>     listener when done. Basically it will work the same as standard
>     servlet async IO, but with byte buffers.
>
>     Stuart
>
>
>         I was hoping someone might point me in the right direction of
>         replicating this behavior with Undertow's
>         ServletOutputStreamImpl. It
>         does have a write(ByteBuffer) method, but it appears to be
>         blocking. And
>         I was hoping there might be some XNIO abstraction for dealing
>         with the
>         ReadableByteChannel, perhaps some example code somewhere?
>
>         Any and all help/advice is appreciated!
>         Jim
>
>         [1]: https://github.com/pedestal/__pedestal
>         <https://github.com/pedestal/pedestal>
>         [2]:
>         http://grepcode.com/file/__repo1.maven.org/maven2/org.__eclipse.jetty/jetty-server/9.__2.0.v20140526/org/eclipse/__jetty/server/HttpOutput.java
>         <http://grepcode.com/file/repo1.maven.org/maven2/org.eclipse.jetty/jetty-server/9.2.0.v20140526/org/eclipse/jetty/server/HttpOutput.java>
>
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