[jboss-dev-forums] [Design of Messaging on JBoss (Messaging/JBoss)] - Re: Client failover redeliveries discussion (Repost)

[clebert.suconic@jboss.com]

"timfox" wrote : "clebert.suconic at jboss.com" wrote : I already have consumers seamlessly reconnecting to a new server during a HA event.
  |   | 
  |   | Basically what I do on failover is to create a new consumer on the new server, replace IDs and re-register the Callback handler.
  |   | 
  | 
  | Sounds about right. But what do you mean by "replace ids"?
  | 

Take an example of recreating the connection.
On the HA experiment Branch, look at ConnectionAspect::handleFailoever:

failoever receives a new ClientConnectionDelegate as the parameter. The idea is to get a new connection, but keep the actual delegates we are using.

Creating a new connection on the new server will create a new server Object, consequently a new ServerId.

The method State.failoever and Delegate transferHAState will be both responsible on making the delegates on the old connection assuming new IDs coming from the new server.


  |         ClientConnectionDelegate otherConnection = (ClientConnectionDelegate)((MethodInvocation)invocation).getArguments()[0];
  |         ConnectionState newConnectionState = (ConnectionState)((ClientConnectionDelegate)otherConnection).getState();
  | 
  |         currentConnectionState.failOver(newConnectionState);
  | 
  |         if (currentConnectionState.getClientID()!=null)
  |         {
  |             otherConnection.setClientID(currentConnectionState.getClientID());
  |         }
  | 
  | 

View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3978878#3978878

Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=3978878