RE: [Asterisk-java-users] ManagerReader Interrupt

[King H. <kin...@ne...>]

I think I have also been bitten by this stray "interrupt" but I have not =
gone so far as to track down where it was thrown.=20

I was having a queue.take() waiting for commands to send to the Asterisk =
but it was being interrupted all the time :(  =20

I have since changed to starting a new thread for each command to send =
to Asterisk instead. I think this has the added benefit that a stuck =
connection will not hang the whole program.

King

-----Original Message-----
From: ast...@li... =
[mailto:ast...@li...] On Behalf Of =
Brett Sutton
Sent: Saturday, March 04, 2006 7:19 PM
To: ast...@li...
Subject: [Asterisk-java-users] ManagerReader Interrupt

I believe that there is a bug in the=20
DefaultManagerConnection.sendAction(ManagerAction action, long timeout)=20
method.

The problem is with the creation of the ResponseHandlerResult.

The ResponseHandlerResult calls thread.interrupt to wake up the thread=20
which called sendAction. Thats fine, the problem begins when the=20
sendAction returns (with or without a response).
Calling Thread.interupt leaves the thread in an interrupted state until=20
some method (such as sleep) checks the threads interrupt state at which=20
point the interrupt state is cleared.
The problem occurs if the call to interrupt is made when sendAction is=20
not currently sleeping. There are numerous ways in which this can =
happen.
The impact on sendAction is zero. However if an application then calls a =

method such as Thread.sleep or Queue.take the method call will=20
immediately throw an Interrupted exception as the thread is still in an=20
interrupted state.

I believe a better way of dealing with this problem is to use=20
Object.wait(x) and Object.notify. For the purposes of sendAction the=20
affects are identical without the nasty side effects of calling =
interrupt.

I hope this makes some sense.

Regards,
Brett.







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