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From Oleg Kalnichevski <ol...@apache.org>
Subject Re: Interrupt flag getting cleared
Date Wed, 30 Jan 2013 12:26:23 GMT
On Wed, 2013-01-30 at 12:07 +0000, James Shaw wrote:
> On 30 January 2013 11:54, Oleg Kalnichevski <olegk@apache.org> wrote:
> > On Wed, 2013-01-30 at 11:22 +0000, James Shaw wrote:
> >> I'm having some trouble tracking this down, but I believe that
> >> httpclient 4.2.3 is clearing the interrupt flag.
> >>
> >> My code looks like this:
> >>
> >> executorService.submit(new Runnable() {
> >>     @Override public void run() {
> >>         while (!Thread.currentThread().isInterrupted()) {
> >>             consume(); // calls AWS SDK which uses Apache HttpClient
> >>         }
> >>     }
> >> });
> >>
> >> Sometimes this loop does not terminate when calling
> >> Future.cancel(true).  The only piece of diagnostics I have so far is
> >> this:
> >> Exception 'java.lang.InterruptedException' occurred in thread
> >> 'queue-consumer-reader-thread-1' at
> >> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.reportInterruptAfterWait(AbstractQueuedSynchronizer.java:2017)
> >> Exception 'java.lang.InterruptedException' occurred in thread
> >> 'queue-consumer-reader-thread-1' at
> >> org.apache.http.impl.conn.tsccm.WaitingThread.await(WaitingThread.java:164)
> >> Exception 'java.lang.InterruptedException' occurred in thread
> >> 'queue-consumer-reader-thread-1' at
> >> org.apache.http.impl.conn.tsccm.ConnPoolByRoute.getEntryBlocking(ConnPoolByRoute.java:410)
> >> Exception 'java.lang.InterruptedException' occurred in thread
> >> 'queue-consumer-reader-thread-1' at
> >> org.apache.http.impl.conn.tsccm.ConnPoolByRoute.getEntryBlocking(ConnPoolByRoute.java:423)
> >>
> >> Should I not expect the interrupt flag to be preserved?  Do you have
> >> any suggestions how I could isolate this bug (I'm not 100% sure if
> >> it's in HttpClient or AWS client right now)?
> >>
> >> Thanks
> >>
> >
> > I am not aware of any place in HttpClient where it might meddle with the
> > interrupt flag.
> Is there anywhere that InterruptException is caught and either not
> rethrown, or the flag is not explicitly set again?  That would be
> sufficient.
> 

There are two places where InterruptedException is re-thrown as
InterruptedIOException. I am not aware of any place where
InterruptedException can be caught and not re-thrown.

Oleg



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