directory-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Emmanuel Lecharny <elecha...@apache.org>
Subject Re: OT: Psuedo Async File IO
Date Sun, 10 Apr 2005 00:14:17 GMT
Yep, you're right. I answer a little bit too fast, thinking that you
needed something simpler. The point is that FileLocks just give you a
lock to files shared with an external process, not with other threads in
the same JVM.  

What about http://www.eecs.harvard.edu/~mdw/proj/java-nbio/ ?

On Sat, 2005-04-09 at 12:55 -0700, Richard Wallace wrote:
> The try lock method is for getting an exclusive lock on a file.  It has 
> nothing to do with the actual reading or writing of the file, other than 
> disallowing other threads or processes from opening the file and reading 
> or writing it.
> 
> Rich
> 
> Emmanuel Lecharny wrote:
> > Hi,
> > 
> > can't you use the FileChannel's tryLock() method?
> > (http://java.sun.com/j2se/1.4.2/docs/api/java/nio/channels/FileChannel.html#tryLock(long,%20long,%20boolean))
> > 
> >  
> > 
> > On Fri, 2005-04-08 at 22:38 -0700, Richard Wallace wrote:
> > 
> >>Java NIO doesn't support non-blocking file IO.  Only non-blocking socket 
> >>IO.  If you look you'll see that the FileChannel does not extend the 
> >>SelectableChannel and so cannot be set to non-blocking mode or 
> >>registered with a selector.
> >>
> >>Ben Walding wrote:
> >>
> >>>Am I confused, or is Java NIO not what you're looking for?
> >>>
> >>>http://java.sun.com/j2se/1.4.2/docs/guide/nio/
> >>>
> >>>Mike Spille wrote some wrappers around NIO, but I'm not sure how active 
> >>>they are:
> >>>
> >>>http://sourceforge.net/projects/pyrasun/
> >>>
> >>>Richard Wallace wrote:
> >>>
> >>>
> >>>>Hey everyone,
> >>>>
> >>>>I'm getting to a point with my smtp protocol provider that I need to

> >>>>start thinking about file IO.  Since there is no support for 
> >>>>non-blocking IO in Java yet I need something that fakes it.  I was 
> >>>>wondering if anyone had any experience with any existing components 
> >>>>that do this.  If there aren't any really good ones that anyone can 
> >>>>recommend I'll probably wind up writing something on my own.
> >>>>
> >>>>I'm kind of thinking it should basically be a component that uses a 
> >>>>single thread to monitor a queue for IO requests and then uses 
> >>>>something like the IoHandler in MINA to let clients know when 
> >>>>reads/writes have started/stopped/failed.
> >>>>
> >>>>Any input on existing components or what would be necessary to maybe

> >>>>repurpose parts of MINA for this task would be great.
> >>>>
> >>>>Thanks,
> >>>>Rich
> >>>>
> >>>
> > 
> > 
> 



Mime
View raw message