protected override StatementAgentInstanceFactoryResult NewContextInternal(AgentInstanceContext agentInstanceContext, bool isRecoveringResilient) { StopCallback stopCallback = new ProxyStopCallback(() => _services.VariableService.DeallocateVariableState(_variableMetaData.VariableName, agentInstanceContext.AgentInstanceId)); _services.VariableService.AllocateVariableState( _variableMetaData.VariableName, agentInstanceContext.AgentInstanceId, _statementContext.StatementExtensionServicesContext, isRecoveringResilient); CreateVariableView createView = new CreateVariableView( _statementContext.StatementId, _services.EventAdapterService, _services.VariableService, _createDesc.VariableName, _statementContext.StatementResultService, agentInstanceContext.AgentInstanceId); _services.VariableService.RegisterCallback(_createDesc.VariableName, agentInstanceContext.AgentInstanceId, createView.Update); _statementContext.StatementStopService.StatementStopped += () => _services.VariableService.UnregisterCallback(_createDesc.VariableName, 0, createView.Update); // Create result set processor, use wildcard selection _statementSpec.SelectClauseSpec.SetSelectExprList(new SelectClauseElementWildcard()); _statementSpec.SelectStreamDirEnum = SelectClauseStreamSelectorEnum.RSTREAM_ISTREAM_BOTH; var typeService = new StreamTypeServiceImpl(new EventType[] { createView.EventType }, new string[] { "create_variable" }, new bool[] { true }, _services.EngineURI, false); OutputProcessViewBase outputViewBase; try { ResultSetProcessorFactoryDesc resultSetProcessorPrototype = ResultSetProcessorFactoryFactory.GetProcessorPrototype( _statementSpec, _statementContext, typeService, null, new bool[0], true, ContextPropertyRegistryImpl.EMPTY_REGISTRY, null, _services.ConfigSnapshot, _services.ResultSetProcessorHelperFactory, false, false); ResultSetProcessor resultSetProcessor = EPStatementStartMethodHelperAssignExpr.GetAssignResultSetProcessor(agentInstanceContext, resultSetProcessorPrototype, false, null, false); // Attach output view OutputProcessViewFactory outputViewFactory = OutputProcessViewFactoryFactory.Make( _statementSpec, _services.InternalEventRouter, agentInstanceContext.StatementContext, resultSetProcessor.ResultEventType, null, _services.TableService, resultSetProcessorPrototype.ResultSetProcessorFactory.ResultSetProcessorType, _services.ResultSetProcessorHelperFactory, _services.StatementVariableRefService); outputViewBase = outputViewFactory.MakeView(resultSetProcessor, agentInstanceContext); createView.AddView(outputViewBase); } catch (ExprValidationException ex) { throw new EPException("Unexpected exception in create-variable context allocation: " + ex.Message, ex); } return(new StatementAgentInstanceFactoryCreateVariableResult(outputViewBase, stopCallback, agentInstanceContext)); }
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); }