/// <summary> Dispatch a SIF_Event.
///
/// <b>When ALQ Disabled:</b> Dispatching of this event is handled in a
/// separate EvDisp thread in case SMB is invoked. This makes it possible
/// to asynchronously return a SIF_Ack code to the dispatchEvent() caller
/// before the handling of the event by the Subscriber is completed. The
/// EvDisp also tracks the internal dispatch state of this particular message.
/// The Topic matching the object type is then notified via its Subscriber's
/// onEvent method. If a TrackQueryResults object is created within that
/// method, its constructor will wakeup the EvDisp thread, instructing it to
/// return a value of 2 (Intermediate). If no TrackQueryResults object is
/// instantiated during the Subscriber.onEvent method, the EvDisp thread
/// returns a 1 (Immediate) status code upon completion.
///
/// <b>When ALQ Enabled:</b> Dispatching is immediate. The Topic matching
/// the object type is then notified via its Subscriber's onEvent method,
/// then processing ends. No EvDisp thread is needed because if a
/// TrackQueryResults is used it will draw upon the ALQ instead of invoking
/// SMB on the zone server.
///
/// Note if an exception is thrown at any time during the processing of a
/// SIF_Event, it is propagated up the call stack. The PH must not return a
/// SIF_Ack for the message; the ALQ must not delete the message from its
/// queue.
///
/// </summary>
private int dispatchEvent(SIF_Event sifEvent)
{
if ((Adk.Debug & AdkDebugFlags.Messaging_Event_Dispatching) != 0)
{
fZone.Log.Debug("Dispatching SIF_Event (" + sifEvent.MsgId + ")...");
}
// Was this event reported by this agent?
if (!fZone.Properties.ProcessEventsFromSelf &&
sifEvent.Header.SIF_SourceId.Equals(fZone.Agent.Id))
{
if ((Adk.Debug & AdkDebugFlags.Messaging_Event_Dispatching) != 0)
{
fZone.Log.Debug
(
"SIF_Event ignored because it was originally reported by this agent (see the adk.messaging.processEventsFromSelf property)");
}
return 1;
}
SIF_ObjectData odata = sifEvent.SIF_ObjectData;
if (odata == null)
{
throw new SifException
(SifErrorCategoryCode.Xml, SifErrorCodes.XML_MISSING_MANDATORY_ELEMENT_6,
"SIF_Event message missing mandatory element",
"SIF_ObjectData is a required element", fZone);
}
//
// Loop through all SIF_EventObjects inside this SIF_Event and dispatch
// to corresponding topics
//
SIF_EventObject eventObj = odata.SIF_EventObject;
if (eventObj == null)
{
throw new SifException
(
SifErrorCategoryCode.Xml,
SifErrorCodes.XML_MISSING_MANDATORY_ELEMENT_6,
"SIF_Event message missing mandatory element",
"SIF_ObjectData/SIF_EventObject is a required element", fZone);
}
int ackCode = 1;
int thisCode;
SifMessageInfo msgInfo = new SifMessageInfo(sifEvent, fZone);
IElementDef typ = Adk.Dtd.LookupElementDef(eventObj.ObjectName);
if (typ == null)
{
// SIF Data Object type not supported
throw new SifException
(
SifErrorCategoryCode.EventReportingAndProcessing,
SifErrorCodes.EVENT_INVALID_EVENT_3,
"Agent does not support this object type", eventObj.ObjectName, fZone);
}
// TODO: For now, the ADK only routes SIF Events to the first context
// in the event. This needs to be implemented to support
// events in multiple contexts
SifContext eventContext = msgInfo.SIFContexts[0];
ISubscriber target = null;
ITopic topic = null;
//
// Lookup the Topic for this SIF object type
// Topics are only used for the SIF Default context
//
topic = fZone.Agent.TopicFactory.LookupInstance(typ, eventContext);
if (topic != null)
{
target = topic.GetSubscriber();
}
if (target == null)
{
// Is a Subscriber registered with the Zone?
target = fZone.GetSubscriber(eventContext, typ);
if (target == null)
{
// Is a Subscriber registered with the Agent?
target = fZone.GetSubscriber(eventContext, typ);
if (target == null)
{
//
// No Subscriber message handler found. Try calling the Undeliverable-
// MessageHandler for the zone or agent. If none is registered,
// return an error SIF_Ack indicating the object type is not
// supported.
//
Boolean handled = false;
IUndeliverableMessageHandler errHandler = fZone.ErrorHandler;
if (errHandler != null)
{
handled = errHandler.OnDispatchError(sifEvent, fZone, msgInfo);
// Notify MessagingListeners...
IEnumerable<IMessagingListener> mList = GetMessagingListeners(fZone);
foreach (IMessagingListener ml in mList)
{
ml.OnMessageProcessed(SifMessageType.SIF_Event, msgInfo);
}
}
if (!handled)
{
fZone.Log.Warn("Received a SIF_Event (" + sifEvent.MsgId + "), but no Subscriber object is registered to handle it");
throw new SifException(
SifErrorCategoryCode.EventReportingAndProcessing,
SifErrorCodes.EVENT_INVALID_EVENT_3,
"Agent does not support this object type",
eventObj.ObjectName, fZone);
}
return 1;
}
}
}
//
// Call Subscriber.onEvent with the event data
//
IList<SifElement> sel = eventObj.GetChildList();
SifDataObject[] data = new SifDataObject[sel.Count];
for (int x = 0; x < sel.Count; x++)
{
data[x] = (SifDataObject)sel[x];
}
// Wrap in an Event object
DataObjectInputStreamImpl dataStr = DataObjectInputStreamImpl.newInstance();
dataStr.Data = data;
Event adkEvent =
new Event(dataStr, eventObj.Action, eventObj.GetChildList()[0].ElementDef);
adkEvent.Zone = fZone;
if ((Adk.Debug & AdkDebugFlags.Messaging_Event_Dispatching) != 0)
{
fZone.Log.Debug
(
"SIF_Event contains " + data.Length + " " + eventObj.ObjectName +
" objects (" + eventObj.Action + ")");
}
if (fQueue == null)
{
if ((Adk.Debug & AdkDebugFlags.Messaging_Event_Dispatching) != 0)
{
fZone.Log.Debug
("Dispatching SIF_Event to Subscriber message handler via EvDisp");
}
//
// -- No ALQ available --
// Dispatch in a separate EvDisp thread. Block until an ack
// status code is available, then return it
//
EvDisp disp;
try
{
disp = checkoutEvDisp(adkEvent);
thisCode = disp.dispatch(target, adkEvent, fZone, topic, msgInfo);
}
finally
{
checkinEvDisp(adkEvent);
}
}
else
{
if ((Adk.Debug & AdkDebugFlags.Messaging_Event_Dispatching) != 0)
{
fZone.Log.Debug("Dispatching SIF_Event to Subscriber message handler");
}
//
// -- ALQ is available --
// Dispatch immediately.
//
try
{
target.OnEvent(adkEvent, fZone, msgInfo);
}
catch (SifException)
{
throw;
}
catch (Exception thr)
{
throw new SifException
(SifErrorCategoryCode.EventReportingAndProcessing,
SifErrorCodes.EVENT_GENERIC_ERROR_1, "Error processing SIF_Event",
"Exception in Subscriber.onEvent message handler: " + thr, fZone);
}
thisCode = 1;
}
if (thisCode > ackCode)
{
ackCode = thisCode;
}
if ((Adk.Debug & AdkDebugFlags.Messaging) != 0)
{
fZone.Log.Debug
("SIF_Event (" + sifEvent.MsgId + ") dispatching returning SIF_Ack status " +
ackCode);
}
return ackCode;
}
private SIF_Event createSIF_Event(IElementDef objType)
{
SIF_Event evnt = new SIF_Event();
evnt.Header.SIF_SourceId = "foo";
SIF_ObjectData sod = new SIF_ObjectData();
SIF_EventObject obj = new SIF_EventObject();
obj.ObjectName = objType.Name;
sod.SIF_EventObject = obj;
evnt.SIF_ObjectData = sod;
obj.Action = EventAction.Add.ToString();
Object eventObject = null;
try
{
eventObject = ClassFactory.CreateInstance(objType.FQClassName);
}
catch (Exception cfe)
{
throw new AdkException("Unable to create instance of " + objType.Name, fZone, cfe);
}
obj.AddChild(objType, (SifElement)eventObject);
return evnt;
}
/**
* Sends a SIF_Event
* @param zone The zone to send the sifEvent to
*/
public SIF_Ack SifEvent(IZone zone, Event sifEvent, String destinationId, String sifMsgId)
{
if (sifEvent.Data == null || sifEvent.Data.Available == false)
{
throw new AdkException("The sifEvent has no SIFDataObjects", zone);
}
SIF_ObjectData od = new SIF_ObjectData();
// Fill out the SIF_ObjectData
IDataObjectInputStream inStr = sifEvent.Data;
SifDataObject data = inStr.ReadDataObject();
SifVersion msgVersion = data.EffectiveSIFVersion;
SIF_EventObject eo = new SIF_EventObject();
od.SIF_EventObject = eo;
eo.Action = sifEvent.ActionString;
eo.ObjectName = data.ElementDef.Tag(msgVersion);
// Create the SIF_Event object
SIF_Event msg = new SIF_Event(msgVersion);
msg.SIF_ObjectData = od;
SIF_Header msgHdr = msg.Header;
// Assign SIF_DestinationId if applicable
if (destinationId != null)
{
msgHdr.SIF_DestinationId = destinationId;
}
while (data != null)
{
eo.Attach(data);
data = inStr.ReadDataObject();
}
if (sifMsgId != null)
{
msgHdr.SIF_MsgId = sifMsgId;
}
SifContext[] contexts = sifEvent.Contexts;
if (contexts == null)
{
contexts = new SifContext[] { SifContext.DEFAULT };
}
SIF_Contexts msgContexts = new SIF_Contexts();
foreach (SifContext context in contexts)
{
msgContexts.AddSIF_Context(context.Name);
}
msgHdr.SIF_Contexts = msgContexts;
return ((ZoneImpl)zone).Dispatcher.send(msg);
}