AsynchronousSocketChannel.shutdownInput()

[Alexander Libman]

Hi Gili,

shutdownOutput () signals the other side the end of stream
So asynch read completed (not failed) with  the value of read bytes equal
to -1.
Example, where shutdownOutput is useful is  AsynchoronousSSLChanel (also a
filter similar to AsynchronousCoder).
Implementation initiates graceful final  handshake.


I looked at your version of AsynchronousCharByteChannel.
BTW, it is another, example where shutdowOutput() can be  used instead of
method  write(CharBuffer source, boolean endOfInput)
I think shutdownOutput() provides more consistent interface.
Terabit's AsynchronousCoder  uses shutdownOutput()  for graceful encoding
final step.

Also there are  some cases (not very often) when  the closure of external
channel (filter itself) should not close
the embedded(internal) channel. Assume we want to write
AsynchronousSMTPClient.
It can be implemented  via the following stack of asynch. filters:
AsynchronousByteChannel
           |
AsynchronousCharChannel
           |
AsynchronousSMTPChannel

AsychronousSMTPChannel "rents"  the underline channels to do a SMTP
transaction:
MailFrom, RcptTo,..., Body

After transactions is completed successfully, SMTP channel can be closed,
but
AsynchronousCharChannel can be reused for the next SMTP transaction.

Would you mind to join our effords to  facilitate Asynchronous Filter
Framework?
What do you think about splitting functionality of "Asynchronous Char Line
Reader" (i.e. your implementation ) into two filters AsynchronousCoder and
AsynchronousScanner?
The first one will do only read/write  CharBuffers and the second  can be
generic AsynchronousScanner similar to Scanner?

Alex









> -----Original Message-----
> From: nio-discuss-bounces at openjdk.java.net
> [mailto:nio-discuss-bounces at openjdk.java.net]On Behalf Of Gili
> Sent: Friday, July 31, 2009 8:44 PM
> To: nio-discuss at openjdk.java.net
> Subject: AsynchronousSocketChannel.shutdownInput()
>
>
>
> Hi,
>
> Just curious, what's the point of shutdownInput() and shutdownOutput() in
> AsynchronousSocketChannel? When would users want to shut them as
> opposed to
> closing the entire channel?
>
> Thanks,
> Gili
> --
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