Examples of com.espertech.esper.view.Viewable

com.espertech.esper.view.Viewable
The Viewable interface marks an object as supporting zero, one or more View instances. All implementing classes must call each view's 'update' method when new data enters it. Implementations must take care to synchronize methods of this interface with other methods such that data flow is threadsafe.


        // create context factory
        StatementAgentInstanceFactoryUpdate contextFactory = new StatementAgentInstanceFactoryUpdate(statementContext, services, streamEventType, updateSpec, onExprView, routerDesc, subSelectStrategyCollection);


        // perform start of hook-up to start
        Viewable finalViewable;
        EPStatementStopMethod stopStatementMethod;
        EPStatementDestroyMethod destroyStatementMethod;
        Map<ExprSubselectNode, SubSelectStrategyHolder> subselectStrategyInstances;


        // With context - delegate instantiation to context

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        EPStatementStartMethodSelectDesc selectDesc = EPStatementStartMethodSelectUtil.prepare(statementSpec, services, statementContext, isRecoveringResilient, defaultAgentInstanceContext, isQueryPlanLogging(services), null, null, null);


        // Determine context
        EPStatementStopMethod stopStatementMethod;
        EPStatementDestroyMethod destroyStatementMethod;
        Viewable finalViewable;
        AggregationService aggregationService;
        Map<ExprSubselectNode, SubSelectStrategyHolder> subselectStrategyInstances;
        Map<ExprPriorNode, ExprPriorEvalStrategy> priorStrategyInstances;
        Map<ExprPreviousNode, ExprPreviousEvalStrategy> previousStrategyInstances;
        List<StatementAgentInstancePreload> preloadList = Collections.emptyList();

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                    services.getEventAdapterService().removeType(allocatedEventType.getName());
                    services.getFilterService().removeType(allocatedEventType);
                }
            }
        };
        Viewable viewable = new ViewableDefaultImpl(eventType);
        return new EPStatementStartResult(viewable, stopMethod, null);
    }

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        // create context factory
        StatementAgentInstanceFactoryOnTrigger contextFactory = new StatementAgentInstanceFactoryOnTrigger(statementContext, statementSpec, services, activator, subSelectStrategyCollection, resultSetProcessorPrototype, validatedJoin, activatorResultEventType, splitDesc, outputResultSetProcessorPrototype, onSetVariableViewFactory, onExprFactory, outputViewFactory, isRecoveringStatement);


        // perform start of hook-up to start
        Viewable finalViewable;
        EPStatementStopMethod stopStatementMethod;
        EPStatementDestroyMethod destroyStatementMethod;
        Map<ExprSubselectNode, SubSelectStrategyHolder> subselectStrategyInstances;
        AggregationService aggregationService;

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            public void stop() {
                StatementAgentInstanceUtil.stopSafe(agentInstanceContext.getTerminationCallbacks(), stopCallbacks, statementContext);
            }
        };


        Viewable finalView;
        ViewableActivationResult[] viewableActivationResult = new ViewableActivationResult[eventStreamParentViewableActivators.length];
        Map<ExprSubselectNode, SubSelectStrategyHolder> subselectStrategies;
        AggregationService aggregationService;
        Viewable[] streamViews;
        Viewable[] eventStreamParentViewable;

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    private Viewable handleSimpleSelect(Viewable view,
                                        ResultSetProcessor resultSetProcessor,
                                        AgentInstanceContext agentInstanceContext)
    {
        Viewable finalView = view;


        // Add filter view that evaluates the filter expression
        if (statementSpec.getFilterRootNode() != null)
        {
            FilterExprView filterView = new FilterExprView(statementSpec.getFilterRootNode().getExprEvaluator(), agentInstanceContext);
            finalView.addView(filterView);
            finalView = filterView;
        }


        // for ordered deliver without output limit/buffer
        if (!statementSpec.getOrderByList().isEmpty() && (statementSpec.getOutputLimitSpec() == null)) {
            SingleStreamDispatchView bf = new SingleStreamDispatchView();
            agentInstanceContext.getEpStatementAgentInstanceHandle().setOptionalDispatchable(bf);
            finalView.addView(bf);
            finalView = bf;
        }


        com.espertech.esper.view.View selectView = outputProcessViewFactory.makeView(resultSetProcessor, agentInstanceContext);


        finalView.addView(selectView);
        finalView = selectView;


        return finalView;
    }

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        // add statically typed event type references: those in the from clause; Dynamic (created) types collected by statement context and added on start
        services.getStatementEventTypeRefService().addReferences(desc.getEpStatement().getName(), desc.getStatementContext().getDynamicReferenceEventTypes());


        // hook up
        Viewable parentView = startResult.getViewable();
        desc.setStopMethod(startResult.getStopMethod());
        desc.setDestroyMethod(startResult.getDestroyMethod());
        statement.setParentView(parentView);
        long timeLastStateChange = services.getSchedulingService().getTime();
        statement.setCurrentState(EPStatementState.STARTED, timeLastStateChange);

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Related Classes of com.espertech.esper.view.Viewable

com.espertech.esper.core.context.factory.StatementAgentInstanceFactoryCreateWindow

com.espertech.esper.core.context.factory.StatementAgentInstanceFactorySelect

com.espertech.esper.core.context.factory.StatementAgentInstancePostLoadSelect

com.espertech.esper.core.context.subselect.SubSelectStrategyFactoryLocalViewPreloaded

com.espertech.esper.core.service.StatementLifecycleSvcImpl

com.espertech.esper.core.start.EPStatementStartMethodCreateIndex

com.espertech.esper.core.start.EPStatementStartMethodCreateSchema

com.espertech.esper.core.start.EPStatementStartMethodCreateVariable

com.espertech.esper.core.start.EPStatementStartMethodOnTrigger

com.espertech.esper.core.start.EPStatementStartMethodSelect

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