Hi @AMofidy-Rouhi,

I’m unsure why you want to understand the structure of ConnectionEventMsg. Referring to a possible scenario that I could think, it relates to OMMConnectionEvent which is used to delivers OMM connection information (i.e., connection status, active host name, port, version information, and any multicast connection information for the connected component) when the application establishes a connection to a connecting node.

However, this event is generated by RFA Java underlying layer automatically, and you don’t have to create your own class because RFA has already provided an internal class named OMMConnectionEventMsg for you already. Here this is the example usage for receiving OMMConnectionEvents scenario.

According to the RFA Java example named com.reuters.rfa.example.omm.cons.StarterConsumer, there is a statement that the application registers OMMConnectionIntSpec using LoginClient as the callback handler. See the snippet code below.

// Declaration
// protected LoginClient _loginClient;
// private Handle _connIntSpecHandle;

// OMMConnectionIntSpec is used to register interest for any OMMConnectionEvents
OMMConnectionIntSpec connIntSpec = new OMMConnectionIntSpec();
_connIntSpecHandle = _ommConsumer.registerClient(_eventQueue, connIntSpec, _loginClient, null);

The application will receive OMMConnectionEvents object in the processEvent() callback method of LoginClient (Client derived class) that was registered earlier. Here this is the snippet code to handle Event.OMM_CONNECTION_EVENT:

public void processEvent(Event event)
{
    ...
    if(event.getType() == Event.OMM_CONNECTION_EVENT)
    {
        OMMConnectionEvent connectionEvent = ((OMMConnectionEvent)event);
        System.out.println(_className + ": Receive an OMM_CONNECTION_EVENT");
        System.out.println("connectionEvent: " + connectionEvent.getClass().getName());
        System.out.println("Name: " + connectionEvent.getConnectionName());
        System.out.println("Status: " + connectionEvent.getConnectionStatus().toString());
        System.out.println("Host: " + connectionEvent.getConnectedHostName());
        System.out.println("Port: " + connectionEvent.getConnectedPort());
        System.out.println("ComponentVersion: " + connectionEvent.getConnectedComponentVersion());
        return;
    }
    ...
}

Here this is the output result of OMMConnectionEvent objects handled by the LoginClient.processEvent() method.

<<My consumer connection connected to the feed server (172.20.33.43)>>
LoginClient: Receive an OMM_CONNECTION_EVENT
connectionEvent: com.reuters.rfa.internal.session.omm.OMMConnectionEventMsg
Name: myNamespace::myConnection
Status: { state: UP, code: NONE, text: ""}
Host: 172.20.33.43
Port: 14002
ComponentVersion: [ads3.0.2.L1.linux.tis.rrg 64-bit]


<<The 172.20.33.43 server was down>>
LoginClient: Receive an OMM_CONNECTION_EVENT
connectionEvent: com.reuters.rfa.internal.session.omm.OMMConnectionEventMsg
Name: myNamespace::myConnection
Status: { state: DOWN, code: NONE, text: "An existing connection was forcibly closed by the remote host"}
Host: 172.20.33.43
Port: 14002
ComponentVersion: [ads3.0.2.L1.linux.tis.rrg 64-bit]


<<RFA attempted to connect to the standby server (192.168.27.46)>>
LoginClient: Receive an OMM_CONNECTION_EVENT
connectionEvent: com.reuters.rfa.internal.session.omm.OMMConnectionEventMsg
Name: myNamespace::myConnection
Status: { state: UP, code: NONE, text: ""}
Host: 192.168.27.46
Port: 14002
ComponentVersion: []

Remark: The "ComponentVersion" information section is not available in some old version of servers.

Anyway, as you can see above, the implementation of the OMMConnectionEvent interface is the internal OMMConnectionEventMsg class (see its relationship below).

More importantly, these classes are available in RFA Java 7.5.0 and later versions. You should try this functionality with the recent version of RFA Java which is 8.0.1.E3 (as of 30 December 2016).

Hope this helps.