OK, did a quick check of the servlet spec - and I could find nothing that
proscribes the kind of thing I was thinking about (in fact it has nothing to
say even about the semantics of using the javax.servlet.ServletInputStream)
Here is some pseudocode for what I had in mind (I'm eliding quite a bit:
void readSocket(SocketChannel sc)
{
ByteBuffer bb = ..
while (requestIncomplete(bb))
{
int bread = sc.read(bb); //non-blocking read
if (bread == 0) // socket has no bytes in
receive-buffer, need to re-register with selector
{
sc.keyFor(selector).interestOps(OP_READ)
// 're-register socket with selector for reads
return;
}
else if (bread == -1) // socket closed - clean up
}
//all bytes on socket (constituting an http request) have
been read
RequestExecutor r = ...
r.execute(new Handler(bb))
}
Note requestIncomplete() returns true only when the *entire* http request
(headers and body) has been read.
Now, this is idiomatic java nio and I have used this pattern in implementing
my own nio server (not for http requests)
I see nothing in the servlet spec that would proscribe this and it scales
wonderfully.
Yet it seems that Tomcats NIO connector does not do this. Hence, my
confusion/curiosity
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