Dupont jean wrote:
> Hi there,
>
> I'm having an issue with a protocol handler i wrote. The handler acquires a
> lock in the first stages of the protocol communication, then multiple
> messages are exchanged between client and server and when the client decides
> to put an end to the communication server should release the acquired lock.
> The problem is multiple threads are used to service the protocol and the
> thread that releases the lock isn't the one that acquired the lock which
> results in an IllegalStateMonitorException.
>
> How can i configure Mina to use a thread pool but to always use the same
> thread in a session as this will prevent the lock problem ?
>
> Here's the code i actually use to configure mina :
>
> ---
> ByteBuffer.setUseDirectBuffers(false);
> ByteBuffer.setAllocator(new SimpleByteBufferAllocator());
>
> IoAcceptor acceptor = new SocketAcceptor(Runtime.getRuntime()
> .availableProcessors() + 1, Executors.newCachedThreadPool());
> IoAcceptorConfig config = new SocketAcceptorConfig();
> ((SocketAcceptorConfig) config).setReuseAddress(true);
> DefaultIoFilterChainBuilder chain = config.getFilterChain();
>
> chain.addLast("codec", new ProtocolCodecFilter(
> new TextLineCodecFactory(Charset.forName("UTF-8"))));
>
> acceptor.bind(new InetSocketAddress(PORT), new
> Pop3ProtocolHandler(true),
> config);
> ---
>
What is it that you are protecting with your lock and what kind of lock are you
using? One of the java.util.concurrent.locks.Lock
implementations?
You seem to be implementing a POP3 server. Are you perhaps using the
lock for preventing concurrent access to a POP3 user's mailbox?
If possible, please post the code of your IoHandler implementation.
/Niklas
--
Niklas Therning
www.spamdrain.net
