public static void StopSafe(StopCallback stopMethod, StatementContext statementContext)
{
try
{
stopMethod.Stop();
}
catch (Exception e)
{
statementContext.ExceptionHandlingService.HandleException(e, statementContext.StatementName, statementContext.Expression, ExceptionHandlerExceptionType.STOP, null);
}
}
protected override StatementAgentInstanceFactoryResult NewContextInternal(AgentInstanceContext agentInstanceContext, bool isRecoveringResilient)
{
var stopCallbacks = new List <StopCallback>();
String windowName = _statementSpec.CreateWindowDesc.WindowName;
Viewable finalView;
Viewable eventStreamParentViewable;
StatementAgentInstancePostLoad postLoad;
Viewable topView;
NamedWindowProcessorInstance processorInstance;
ViewableActivationResult viewableActivationResult;
try
{
// Register interest
viewableActivationResult = _activator.Activate(agentInstanceContext, false, isRecoveringResilient);
stopCallbacks.Add(viewableActivationResult.StopCallback);
eventStreamParentViewable = viewableActivationResult.Viewable;
// Obtain processor for this named window
var processor = _services.NamedWindowMgmtService.GetProcessor(windowName);
if (processor == null)
{
throw new Exception("Failed to obtain named window processor for named window '" + windowName + "'");
}
// Allocate processor instance
processorInstance = processor.AddInstance(agentInstanceContext);
var rootView = processorInstance.RootViewInstance;
eventStreamParentViewable.AddView(rootView);
// Materialize views
var viewFactoryChainContext = new AgentInstanceViewFactoryChainContext(agentInstanceContext, true, null, null);
var createResult = _services.ViewService.CreateViews(rootView, _unmaterializedViewChain.FactoryChain, viewFactoryChainContext, false);
topView = createResult.TopViewable;
finalView = createResult.FinalViewable;
// add views to stop callback if applicable
StatementAgentInstanceFactorySelect.AddViewStopCallback(stopCallbacks, createResult.NewViews);
// If this is a virtual data window implementation, bind it to the context for easy lookup
StopCallback envStopCallback = null;
if (finalView is VirtualDWView)
{
var objectName = "/virtualdw/" + windowName;
var virtualDWView = (VirtualDWView)finalView;
_services.EngineEnvContext.Bind(objectName, virtualDWView.VirtualDataWindow);
envStopCallback = new ProxyStopCallback(() =>
{
virtualDWView.Dispose();
_services.EngineEnvContext.Unbind(objectName);
});
}
StopCallback environmentStopCallback = envStopCallback;
// Only if we are context-allocated: destroy the instance
var contextName = processor.ContextName;
var agentInstanceId = agentInstanceContext.AgentInstanceId;
var allInOneStopMethod = new ProxyStopCallback(() =>
{
var windowNameX = _statementSpec.CreateWindowDesc.WindowName;
var processorX = _services.NamedWindowMgmtService.GetProcessor(windowNameX);
if (processorX == null)
{
Log.Warn("Named window processor by name '" + windowNameX + "' has not been found");
}
else
{
NamedWindowProcessorInstance instance =
processorX.GetProcessorInstanceAllowUnpartitioned(agentInstanceId);
if (instance != null)
{
if (contextName != null)
{
instance.Dispose();
}
else
{
instance.Stop();
}
}
}
if (environmentStopCallback != null)
{
environmentStopCallback.Stop();
}
});
stopCallbacks.Add(allInOneStopMethod);
// Attach tail view
NamedWindowTailViewInstance tailView = processorInstance.TailViewInstance;
finalView.AddView(tailView);
finalView = tailView;
// obtain result set processor
ResultSetProcessor resultSetProcessor = EPStatementStartMethodHelperAssignExpr.GetAssignResultSetProcessor(agentInstanceContext, _resultSetProcessorPrototype, false, null, false);
// Attach output view
View outputView = _outputProcessViewFactory.MakeView(resultSetProcessor, agentInstanceContext);
finalView.AddView(outputView);
finalView = outputView;
// obtain post load
postLoad = processorInstance.PostLoad;
// Handle insert case
if (_statementSpec.CreateWindowDesc.IsInsert && !_isRecoveringStatement)
{
String insertFromWindow = _statementSpec.CreateWindowDesc.InsertFromWindow;
NamedWindowProcessor namedWindowProcessor = _services.NamedWindowMgmtService.GetProcessor(insertFromWindow);
NamedWindowProcessorInstance sourceWindowInstances = namedWindowProcessor.GetProcessorInstance(agentInstanceContext);
IList <EventBean> events = new List <EventBean>();
if (_statementSpec.CreateWindowDesc.InsertFilter != null)
{
var eventsPerStream = new EventBean[1];
var filter = _statementSpec.CreateWindowDesc.InsertFilter.ExprEvaluator;
for (IEnumerator <EventBean> it = sourceWindowInstances.TailViewInstance.GetEnumerator(); it.MoveNext();)
{
var candidate = it.Current;
eventsPerStream[0] = candidate;
var result = filter.Evaluate(new EvaluateParams(eventsPerStream, true, agentInstanceContext));
if ((result == null) || (false.Equals(result)))
{
continue;
}
events.Add(candidate);
}
}
else
{
for (IEnumerator <EventBean> it = sourceWindowInstances.TailViewInstance.GetEnumerator(); it.MoveNext();)
{
events.Add(it.Current);
}
}
if (events.Count > 0)
{
EventType rootViewType = rootView.EventType;
EventBean[] convertedEvents = _services.EventAdapterService.TypeCast(events, rootViewType);
rootView.Update(convertedEvents, null);
}
}
}
catch (Exception)
{
StopCallback callback = StatementAgentInstanceUtil.GetStopCallback(stopCallbacks, agentInstanceContext);
StatementAgentInstanceUtil.StopSafe(callback, _statementContext);
throw;
}
var createWindowResult = new StatementAgentInstanceFactoryCreateWindowResult(
finalView, null, agentInstanceContext, eventStreamParentViewable, postLoad, topView, processorInstance, viewableActivationResult);
if (_statementContext.StatementExtensionServicesContext != null)
{
_statementContext.StatementExtensionServicesContext.ContributeStopCallback(createWindowResult, stopCallbacks);
}
Log.Debug(".start Statement start completed");
StopCallback stopCallback = StatementAgentInstanceUtil.GetStopCallback(stopCallbacks, agentInstanceContext);
createWindowResult.StopCallback = stopCallback;
return(createWindowResult);
}
