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From "Nate" <nmcm...@charter.net>
Subject Re: How to interrupt connexion ?
Date Thu, 03 Jul 2003 20:29:24 GMT
This may be an ignorant question, but here it goes:

Couldn't you have an interrupt method that calls close() on the underlying
streams, then calls close() on the socket itself?  If I recall correctly,
calling close() on a socket causes any thread that is blocked on that socket
to throw a SocketException.  But it should work if you shut down the
associated streams first, right?

--Nathan McMinn

----- Original Message -----
From: "Laura Werner" <laura@lwerner.org>
To: "Commons HttpClient Project" <commons-httpclient-dev@jakarta.apache.org>
Sent: Thursday, July 03, 2003 3:12 PM
Subject: Re: How to interrupt connexion ?


> Oleg Kalnichevski wrote:
>
> >Sadly enough, there's (there will be) no reliable way to interrupt a
> >request in the release 2.0. It is an unfortunate oversight on our part.
> >This feature is planned for the 2.1 release:
> >
> >
> This is a hard problem, because almost all of the calls in the old
> java.io library are non-interruptible.  There's no good way to, for
> example, have a background thread whose job is to interrupt requests
> that have taken too long.  In our current code, we fake interruptible
> threads by using (pooled) background threads to execute the requests.
> When the timeout interval expires, we give up on waiting for the
> background thread to finish the fetch and just throw a timeout
> exception.  But I haven't found a way to make the background thread
> actually stop the fetch, so it just sits there until the socket timeout
> (if any) triggers an IOException.  At that point we can recycle the
> thread back into the pool.  This is very error-prone, though; I'm
> currently trying to track down a nasty synchronization bug in the
threading.
>
> To make this feature work, we'd probably have to do something like this:
>
> - Add a timeout property to HttpMethod or HttpMethodBase
> - Just before executing a method, set an internal "endTime" property
> - Every time we're about to do a socket operation, e.g. in
> AutoCloseInputStream.read(), compare the current time and endTime.  If
> we're past endTime, though an exception.  If not, adjust the socket
> timeout so that the read operation can't go past endTime.
> - Do similar things while waiting on the connection pool, opening
> sockets, etc.
>
> Yuck.  I keep thinking there *must* be a simpler way, but I haven't
> found it yet.
>
> -- Laura
>
>
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