Java.NIO channel never becomes writable

[nooneinparticular314159]

I'm using Java.NIO to implement a connection between two nodes. The
local node appears to connect ok to the remote node, and successfully
creates a channel. But the channel ever becomes writable, so no
communication ever occurs. What could be causing this?

Thanks!

 

[Christian]

I'm using Java.NIO to implement a connection between two nodes. The
local node appears to connect ok to the remote node, and successfully
creates a channel. But the channel ever becomes writable, so no
communication ever occurs. What could be causing this?

Thanks!

Can you show us a bit of your code? (ssce)

Otherwise it would be just guessing..
First mistakes that comes to my mind would be that you never set the key
to be intrested in write operation.

 

[nooneinparticular314159]

Can you show us a bit of your code? (ssce)

Otherwise it would be just guessing..
First mistakes that comes to my mind would be that you never set the key
to be intrested in write operation.

I think that was it. After I sent the key to writable, problem
solved.

What is ssce?

Thanks!

 

[Andrea Francia]

What is ssce?

Probably Christian would say SSCCE that is Short, Self Contained,
Correct (Compilable), Example.
See http://homepage1.nifty.com/algafield/sscce.html

 

[Lew]

Probably Christian would say SSCCE that is Short, Self Contained,
Correct (Compilable), Example.
See http://homepage1.nifty.com/algafield/sscce.html

It's nice to see Andrew's article still out there. It looks like physci.org
doesn't have a spot to call home right now.

<http://www.mindprod.com/jgloss/sscce.html>
has a good essay on it, also.

 

[nooneinparticular314159]

I think that was it.  After I sent the key to writable, problem
solved.  

What is ssce?

Thanks!

Ok. I was wrong. That doesn't seem to solve it. I clearly have two
nodes writing to teh channel, but the channel never contains a
readable key, even if it is set to readable, or to readable and
writable.

I check for it with:
if (NextKey.isReadable()) {

but it never is.

I also check for if (NextKey.isWritable()) {
and it often is. In fact, if I don't make the channels read only when
I don't have soemthing to write, they never stop being writable and my
program just loops on them.

Thanks!

 

[Gordon Beaton]

On Sun, 16 Mar 2008 18:04:25 -0700 (PDT),

In fact, if I don't make the channels read only when I don't have
soemthing to write, they never stop being writable and my program
just loops on them.

That's normal. And it's why you shouldn't check for writable (even
when writing) except when the previous write() came up short.

Search for "nio writeable" in this group to find many discussions
about this behaviour.

/gordon

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