Sorry - yes I get an exception stating that it cannot connect to the given
URI (even though the URI is 100% correct in that block of code). When I shut
down the client and restart it - it works fine.
On 10 May 2010 21:31, Timothy Bish <tabish...@gmail.com> wrote:
> On Mon, 2010-05-10 at 15:04 +0100, Tammer Salem wrote:
> > Hello All,
> > I have an NMS client using the stomp broker on a .netcf device. For the
> most
> > part it works absolutely fine, but now I'm trying to harden the device
> (for
> > network failures etc.).
> > I have added an exception listener and specifically look for IOExceptions
> > (which I believe are what .NET throws if the GPRS/3G network connectivity
> > dies). I can successfully capture this exception and then I fire off a
> > thread to restart the connection and add my listeners again.
> >
> > At the moment this method doesn't seem to work - I can never get a
> > connection again. Can anyone advise what is the best way of doing this?
> >
>
> So what happens exactly when the code attempts to create the new
> Connection object and restore the Sessions and Destinations etc? Is
> there an exception being thrown?
>
> Regards
> Tim.
>
>
> > I've also attached my code so that you know what I'm trying to do.
> >
> > class AMQMessageHandler
> >
> > {
> >
> > private String myQueue;
> >
> > private String connecturi;
> >
> >
> >
> > //private ISession session;
> >
> > IConnectionFactory factory;
> >
> > IConnection connection;
> >
> > ISession session;
> >
> > IDestination destination;
> >
> > IMessageConsumer messageConsumer;
> >
> >
> >
> > /*
> >
> > * the UI thread within whose context the code will be executed
> >
> > */
> >
> > private Form uiThread;
> >
> >
> > > /*
> >
> > * function in the UI thread to handle exceptions
> >
> > */
> >
> > private Delegate exceptionDelegate;
> >
> >
> > >
> > > public AMQMessageHandler(String connectionURI, String driverID,
> > > Delegate exceptionDelegate, Form uiThread)
> >
> > {
> >
> > this.connecturi = connectionURI;
> >
> > this.myQueue = "driver.channel." + driverID;
> >
> > this.uiThread = uiThread;
> >
> > this.exceptionDelegate = exceptionDelegate;
> >
> > }
> >
> >
> > > public void start()
> >
> > {
> >
> >
> > > try
> >
> > {
> >
> > this.factory = new ConnectionFactory(connecturi);
> >
> > this.connection = this.factory.CreateConnection();
> >
> > this.session = this.connection.CreateSession();
> >
> > this.destination = SessionUtil.GetDestination(session,
> > > "queue://" + myQueue);
> >
> > this.messageConsumer =
> session.CreateConsumer(destination);
> >
> >
> >
> > messageConsumer.Listener += new
> > > MessageListener(messageConsumer_Listener);
> >
> > connection.ExceptionListener += new
> > > ExceptionListener(connection_ExceptionListener);
> >
> > connection.Start();
> >
> >
> > > }
> >
> > catch (Exception ex)
> >
> > {
> >
> > uiThread.Invoke(exceptionDelegate,ex.Message);
> >
> > }
> >
> > }
> >
> >
> > > public delegate void RestartConnectionDelegate();
> >
> >
> > > private void restartConnection()
> >
> > {
> >
> > new System.Threading.Thread(threadedStartConnection).Start();
> >
> > }
> >
> >
> > > private void threadedStartConnection()
> >
> > {
> >
> > int retryCount = 1;
> >
> > bool keepTryingtoRestart = true;
> >
> >
> > > while (keepTryingtoRestart == true)
> >
> > {
> >
> > //tsalem - add some kind of logging here
> >
> > //listBox.Items.Add("attempting to reconnect - pass " +
> > > retryCount);
> >
> > System.Threading.Thread.Sleep(3000);
> >
> >
> > > try
> >
> > {
> >
> > this.factory = new ConnectionFactory(connecturi);
> >
> > this.connection = this.factory.CreateConnection();
> >
> > this.session = this.connection.CreateSession();
> >
> > this.destination =
> SessionUtil.GetDestination(session,
> > > "queue://" + myQueue);
> >
> > this.messageConsumer =
> > > session.CreateConsumer(destination);
> >
> > messageConsumer.Listener += new
> > > MessageListener(messageConsumer_Listener);
> >
> > connection.ExceptionListener += new
> > > ExceptionListener(connection_ExceptionListener);
> >
> > connection.Start();
> >
> >
> > > keepTryingtoRestart = false;
> >
> > }
> >
> > catch (Exception ex)
> >
> > {
> >
> > uiThread.Invoke(exceptionDelegate, ex.Message +"\n" +
> > > ex.StackTrace);
> >
> > //tsalem change this to check for keep retrying
> rather
> > > than on a counter
> >
> > if (retryCount == 50)
> >
> > {
> >
> > keepTryingtoRestart = false;
> >
> > }
> >
> >
> > > }
> >
> >
> >
> > retryCount++;
> >
> > }
> >
> > }
> >
> >
> > >
> > > public void messageConsumer_Listener(IMessage receivedMessage)
> >
> > {
> >
> > try
> >
> > {
> >
> > ITextMessage message = receivedMessage as ITextMessage;
> >
> > message.Acknowledge();
> >
> > //tsalem - todo - handle message
> >
> > if (message.Text != null)
> >
> > {
> >
> > AMQUtil.Instance.ResponseAvailable(message.Text,
> > > uiThread);
> >
> > }
> >
> > else
> >
> > {
> >
> > uiThread.Invoke(exceptionDelegate, "ERROR: AMQ
> Message
> > > is empty");
> >
> > }
> >
> > }
> >
> > catch (Exception ex)
> >
> > {
> >
> > uiThread.Invoke(exceptionDelegate,ex.Message);
> >
> > }
> >
> > }
> >
> >
> > >
> > >
> > > void connection_ExceptionListener(Exception exception)
> >
> > {
> >
> > uiThread.Invoke(exceptionDelegate,exception.Message);
> >
> >
> > > if (exception is System.IO.IOException)
> >
> > {
> >
> > //Invoke(new
> > > RestartConnectionDelegate(threadedStartConnection));
> >
> > threadedStartConnection();
> >
> > }
> >
> > }
> >
> > }
> >
> >
> > regards,
> > Tammer
>
> --
> Tim Bish
>
> Open Source Integration: http://fusesource.com
> ActiveMQ in Action: http://www.manning.com/snyder/
>
> Follow me on Twitter: http://twitter.com/tabish121
> My Blog: http://timbish.blogspot.com/
>
>
