protected void InitializeIfReq()
{
try
{
if (this.session == null || this.session.IsClosed)
{
if (this.session != null)
{
this.session.Dispose();
}
if (this.messageConsumer != null)
{
this.messageConsumer.Dispose();
}
this.session = (Session)this.sessionProvider.GetSession(transactionalMode: false);
this.messageConsumer = this.session.CreateConsumer(this.queue, this.Selector);
}
}
catch (Apache.NMS.NMSConnectionException exc)
{
throw new QueueingException("Cannot receive a message due to connection problems", exc);
}
catch (Apache.NMS.ActiveMQ.ConnectionClosedException exc)
{
throw new QueueingException("Cannot receive a message because connection is closed", exc);
}
}
/// <summary>
/// Subscribes to a message. This notifies the server that we are interested in messages that contain the given argument as the first word in the message.
/// See <see cref="SendMessage(string,string)"/>
/// <para />
/// For each message that is received, the MessageEvent handler will be called for all listeners. See <see cref="OnMessage"/>
/// <para />
/// More than one subscription can be made. Alternatively, an asterisk (*) may be sent as a special-case argument that indicates we're interested in *all* messages.
/// This should be used very sparingly because it can cause quite a bit of network traffic.
/// </summary>
/// <param name="req">Indicates what types of messages we are interested in receiving. This tells the server to send messages where the first word matches req</param>
public void SubscribeMessage(string req)
{
// check if we've already subscribed to this message
foreach (KeyValuePairConsumer c in m_consumers)
{
if (c.Key == req)
{
return;
}
}
// special case for asterisk. If we pass in an asterisk, we are subscribing to all messages
string messageSelector;
if (req == "*")
{
messageSelector = "ELVISH_SCOPE = '" + m_scope + "' AND MESSAGE_PREFIX LIKE '%'";
m_subscribedAll = true;
}
else
{
messageSelector = "ELVISH_SCOPE = '" + m_scope + "' AND MESSAGE_PREFIX = '" + req + "'";
}
//string messageSelector = "ELVISH_SCOPE = '" + m_scope + "' AND MESSAGE_PREFIX = '" + req + "'";
//m_consumers.add( m_session.createDurableConsumer( m_destination, req, reqString, false ) );
//try
{
//MessageConsumer c = m_session.createDurableSubscriber( (Topic)m_destination, req, messageSelector, false );
Apache.NMS.IMessageConsumer c = m_session.CreateConsumer(m_destination, messageSelector);
//MessageConsumer c = m_session.createConsumer( m_destination, null );
//MessageConsumer c = m_session.createConsumer( m_destination );
c.Listener += this.OnMessage;
m_consumers.Add(new KeyValuePairConsumer(req, c));
//System.out.println("subscribeMessage(): " + messageSelector);
}
// if we subscribed to "*", remove all the other listeners to prevent duplicate messages
if (m_subscribedAll)
{
foreach (KeyValuePairConsumer c in m_consumers)
{
if (c.Key.CompareTo("*") != 0)
{
c.Value.Listener -= this.OnMessage;
c.Value.Listener -= this.OnMessageIgnore;
c.Value.Listener += this.OnMessageIgnore;
}
}
}
}
public Apache.NMS.IMessageConsumer CreateConsumer(Apache.NMS.IDestination destination, string selector, bool noLocal)
{
Apache.NMS.EMS.Destination destinationObj = (Apache.NMS.EMS.Destination)destination;
try
{
Apache.NMS.IMessageConsumer consumer = EMSConvert.ToNMSMessageConsumer(this, this.tibcoSession.CreateConsumer(destinationObj.tibcoDestination, selector, noLocal));
ConfigureConsumer(consumer);
return(consumer);
}
catch (Exception ex)
{
ExceptionUtil.WrapAndThrowNMSException(ex);
return(null);
}
}
public Apache.NMS.IMessageConsumer CreateDurableConsumer(Apache.NMS.ITopic destination, string name, string selector, bool noLocal)
{
Apache.NMS.EMS.Topic topicObj = (Apache.NMS.EMS.Topic)destination;
try
{
Apache.NMS.IMessageConsumer consumer = EMSConvert.ToNMSMessageConsumer(this, this.tibcoSession.CreateDurableSubscriber(topicObj.tibcoTopic, name, selector, noLocal));
ConfigureConsumer(consumer);
return(consumer);
}
catch (Exception ex)
{
ExceptionUtil.WrapAndThrowNMSException(ex);
return(null);
}
}
protected virtual void Dispose(bool disposing)
{
if (this.isDisposed)
{
return;
}
if (disposing)
{
if (this.messageConsumer != null)
{
this.messageConsumer.Dispose();
}
if (this.session != null)
{
this.session.Dispose();
}
}
this.messageConsumer = null;
this.session = null;
this.isDisposed = true;
}
private void ConfigureConsumer(Apache.NMS.IMessageConsumer consumer)
{
consumer.ConsumerTransformer = this.ConsumerTransformer;
}
