Oliver Köll wrote:
Hi Oleg,
thanks for your reply. See inline...
I'm working on a GUI program, where HttpMethods are executed on the
request of the user. As e.g. in a Webbrowser, I would like to enable
unpatient users to cancel requests that take too long.
I currently don't see any possibilities to cancel a running request
from a separate thread, though. Neither HttpMethod.abort() nor
Thread.interrupt() have any effect.
HttpMethod#abort closes the underlying socket. This effectively kills
the connection. What other effect do you expect?
I was testing a case where HttpClient was trying to connect to an
unreachable host and abort() didn't have any effect. OTH, even Firefox
goes into a limbo in such cases, so I guess I bear with that...
Oliver,
This is a known problem. For a detailed explanation see
http://issues.apache.org/bugzilla/show_bug.cgi?id=35383
While thinking about this problem, I'm having problems understanding
the purpose of the HttpMethod.abort() method. It clearly isn't
intended for use from separate threads because no synchronization is
performed.
It is not supposed to synchronise on any object instance in
HttpMethodBase class as all the magic happens in HttpConnection and
java.net.Socket classes
Hmm, shouldn't at least HttpMethodBase.aborted and
HttpMethodBase.responseConnection be synchronized, because these
attributes can obviously be accessed from different threads when using
abort()? Also, I don't see any synchronization in HttpConnection either.
The synchronization of access to individual connections is achieved by
using a threading-safe connection manager. The HttpConnection class as
such is not threading-safe. However, the HttpConnection#close() method
should be safe to call from any thread. If you see any specific problems
in it that may lead to a race condition, please feel free to file a bug
report.
Oleg
Oliver
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