Examples of com.espertech.esper.epl.core.ResultSetProcessor

com.espertech.esper.epl.core.ResultSetProcessor
Processor for result sets coming from 2 sources. First, out of a simple view (no join). And second, out of a join of event streams. The processor must apply the select-clause, grou-by-clause and having-clauses as supplied. It must state what the event type of the result rows is.

            // start subselects
            subselectStrategies = EPStatementStartMethodHelperSubselect.startSubselects(services, subSelectStrategyCollection, agentInstanceContext, stopCallbacks);


            // obtain result set processor and aggregation services
            Pair<ResultSetProcessor, AggregationService> processorPair = EPStatementStartMethodHelperUtil.startResultSetAndAggregation(resultSetProcessorFactoryDesc, agentInstanceContext);
            final ResultSetProcessor resultSetProcessor = processorPair.getFirst();
            aggregationService = processorPair.getSecond();


            // for just 1 event stream without joins, handle the one-table process separatly.
            final JoinPreloadMethod joinPreloadMethod;
            if (streamViews.length == 1)

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            NamedWindowTailViewInstance tailView = processorInstance.getTailViewInstance();
            finalView.addView(tailView);
            finalView = tailView;


            // obtain result set processor
            ResultSetProcessor resultSetProcessor = EPStatementStartMethodHelperAssignExpr.getAssignResultSetProcessor(agentInstanceContext, resultSetProcessorPrototype);


            // Attach output view
            View outputView = outputProcessViewFactory.makeView(resultSetProcessor, agentInstanceContext);
            finalView.addView(outputView);
            finalView = outputView;

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            else
            {
                ResultSetProcessor[] processors = new ResultSetProcessor[splitDesc.getProcessorFactories().length];
                for (int i = 0; i < processors.length; i++) {
                    ResultSetProcessorFactoryDesc factory = splitDesc.getProcessorFactories()[i];
                    ResultSetProcessor processor = factory.getResultSetProcessorFactory().instantiate(null, null, agentInstanceContext);
                    processors[i] = processor;
                }


                OnTriggerSplitStreamDesc desc = (OnTriggerSplitStreamDesc) statementSpec.getOnTriggerDesc();
                onExprView = new RouteResultView(desc.isFirst(), activatorResultEventType, statementContext.getEpStatementHandle(), services.getInternalEventRouter(), splitDesc.getNamedWindowInsert(), processors, splitDesc.getWhereClauses(), statementContext);
            }


            // attach stream to view
            final ViewableActivationResult activationResult = activator.activate(agentInstanceContext, false);
            activationResult.getViewable().addView(onExprView);
            stopCallbacks.add(activationResult.getStopCallback());


            // start subselects
            subselectStrategies = EPStatementStartMethodHelperSubselect.startSubselects(services, subSelectStrategyCollection, agentInstanceContext, stopCallbacks);


            // attach view to output: for on-delete, create an output processor that passes on as a wildcard the underlying event
            if ((statementSpec.getOnTriggerDesc().getOnTriggerType() == OnTriggerType.ON_DELETE) ||
                (statementSpec.getOnTriggerDesc().getOnTriggerType() == OnTriggerType.ON_SET) ||
                (statementSpec.getOnTriggerDesc().getOnTriggerType() == OnTriggerType.ON_UPDATE) ||
                (statementSpec.getOnTriggerDesc().getOnTriggerType() == OnTriggerType.ON_MERGE))
            {
                ResultSetProcessor outputResultSetProcessor = outputResultSetProcessorPrototype.getResultSetProcessorFactory().instantiate(null, null, agentInstanceContext);


                // Attach output view
                View outputView = outputProcessViewFactory.makeView(outputResultSetProcessor, agentInstanceContext);
                onExprView.addView(outputView);
                onExprView = outputView;

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        OrderByProcessor orderByProcessor = null;
        if (resultSetProcessorPrototype.getOrderByProcessorFactory() != null) {
            orderByProcessor = resultSetProcessorPrototype.getOrderByProcessorFactory().instantiate(aggregationService);
        }


        ResultSetProcessor resultSetProcessor = resultSetProcessorPrototype.getResultSetProcessorFactory().instantiate(orderByProcessor, aggregationService, agentInstanceContext);


        return new Pair<ResultSetProcessor, AggregationService>(resultSetProcessor, aggregationService);
    }

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            // start subselects
            subselectStrategies = EPStatementStartMethodHelperSubselect.startSubselects(services, subSelectStrategyCollection, agentInstanceContext, stopCallbacks);


            // obtain result set processor and aggregation services
            Pair<ResultSetProcessor, AggregationService> processorPair = EPStatementStartMethodHelperUtil.startResultSetAndAggregation(resultSetProcessorFactoryDesc, agentInstanceContext);
            final ResultSetProcessor resultSetProcessor = processorPair.getFirst();
            aggregationService = processorPair.getSecond();


            // for just 1 event stream without joins, handle the one-table process separatly.
            final JoinPreloadMethod joinPreloadMethod;
            JoinSetComposerDesc joinSetComposer = null;

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            else
            {
                ResultSetProcessor[] processors = new ResultSetProcessor[splitDesc.getProcessorFactories().length];
                for (int i = 0; i < processors.length; i++) {
                    ResultSetProcessorFactoryDesc factory = splitDesc.getProcessorFactories()[i];
                    ResultSetProcessor processor = factory.getResultSetProcessorFactory().instantiate(null, null, agentInstanceContext);
                    processors[i] = processor;
                }


                OnTriggerSplitStreamDesc desc = (OnTriggerSplitStreamDesc) statementSpec.getOnTriggerDesc();
                onExprView = new RouteResultView(desc.isFirst(), activatorResultEventType, statementContext.getEpStatementHandle(), services.getInternalEventRouter(), splitDesc.getNamedWindowInsert(), processors, splitDesc.getWhereClauses(), statementContext);
            }


            // attach stream to view
            final ViewableActivationResult activationResult = activator.activate(agentInstanceContext, false, isRecoveringResilient);
            activationResult.getViewable().addView(onExprView);
            stopCallbacks.add(activationResult.getStopCallback());


            // start subselects
            subselectStrategies = EPStatementStartMethodHelperSubselect.startSubselects(services, subSelectStrategyCollection, agentInstanceContext, stopCallbacks);


            // attach view to output: for on-delete, create an output processor that passes on as a wildcard the underlying event
            if ((statementSpec.getOnTriggerDesc().getOnTriggerType() == OnTriggerType.ON_DELETE) ||
                (statementSpec.getOnTriggerDesc().getOnTriggerType() == OnTriggerType.ON_SET) ||
                (statementSpec.getOnTriggerDesc().getOnTriggerType() == OnTriggerType.ON_UPDATE) ||
                (statementSpec.getOnTriggerDesc().getOnTriggerType() == OnTriggerType.ON_MERGE))
            {
                ResultSetProcessor outputResultSetProcessor = outputResultSetProcessorPrototype.getResultSetProcessorFactory().instantiate(null, null, agentInstanceContext);


                // Attach output view
                View outputView = outputProcessViewFactory.makeView(outputResultSetProcessor, agentInstanceContext);
                onExprView.addView(outputView);
                onExprView = outputView;

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            else
            {
                ResultSetProcessor[] processors = new ResultSetProcessor[splitDesc.getProcessorFactories().length];
                for (int i = 0; i < processors.length; i++) {
                    ResultSetProcessorFactoryDesc factory = splitDesc.getProcessorFactories()[i];
                    ResultSetProcessor processor = factory.getResultSetProcessorFactory().instantiate(null, null, agentInstanceContext);
                    processors[i] = processor;
                }


                OnTriggerSplitStreamDesc desc = (OnTriggerSplitStreamDesc) statementSpec.getOnTriggerDesc();
                onExprView = new RouteResultView(desc.isFirst(), activatorResultEventType, statementContext.getEpStatementHandle(), services.getInternalEventRouter(), splitDesc.getNamedWindowInsert(), processors, splitDesc.getWhereClauses(), agentInstanceContext);
            }


            // attach stream to view
            final ViewableActivationResult activationResult = activator.activate(agentInstanceContext, false, isRecoveringResilient);
            activationResult.getViewable().addView(onExprView);
            stopCallbacks.add(activationResult.getStopCallback());
            optPatternRoot = activationResult.getOptionalPatternRoot();


            // start subselects
            subselectStrategies = EPStatementStartMethodHelperSubselect.startSubselects(services, subSelectStrategyCollection, agentInstanceContext, stopCallbacks);


            // attach view to output: for on-delete, create an output processor that passes on as a wildcard the underlying event
            if ((statementSpec.getOnTriggerDesc().getOnTriggerType() == OnTriggerType.ON_DELETE) ||
                (statementSpec.getOnTriggerDesc().getOnTriggerType() == OnTriggerType.ON_SET) ||
                (statementSpec.getOnTriggerDesc().getOnTriggerType() == OnTriggerType.ON_UPDATE) ||
                (statementSpec.getOnTriggerDesc().getOnTriggerType() == OnTriggerType.ON_MERGE))
            {
                ResultSetProcessor outputResultSetProcessor = outputResultSetProcessorPrototype.getResultSetProcessorFactory().instantiate(null, null, agentInstanceContext);


                // Attach output view
                View outputView = outputProcessViewFactory.makeView(outputResultSetProcessor, agentInstanceContext);
                onExprView.addView(outputView);
                onExprView = outputView;

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        OrderByProcessor orderByProcessor = null;
        if (resultSetProcessorPrototype.getOrderByProcessorFactory() != null) {
            orderByProcessor = resultSetProcessorPrototype.getOrderByProcessorFactory().instantiate(aggregationService);
        }


        ResultSetProcessor resultSetProcessor = resultSetProcessorPrototype.getResultSetProcessorFactory().instantiate(orderByProcessor, aggregationService, agentInstanceContext);


        return new Pair<ResultSetProcessor, AggregationService>(resultSetProcessor, aggregationService);
    }

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        OrderByProcessor orderByProcessor = null;
        if (resultSetProcessorPrototype.getOrderByProcessorFactory() != null) {
            orderByProcessor = resultSetProcessorPrototype.getOrderByProcessorFactory().instantiate(aggregationService);
        }


        ResultSetProcessor processor = resultSetProcessorPrototype.getResultSetProcessorFactory().instantiate(orderByProcessor, aggregationService, agentInstanceContext);


        // initialize aggregation expression nodes
        if (resultSetProcessorPrototype.getAggregationServiceFactoryDesc() != null) {
            for (AggregationServiceAggExpressionDesc aggregation : resultSetProcessorPrototype.getAggregationServiceFactoryDesc().getExpressions()) {
                aggregation.assignFuture(aggregationService);

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            NamedWindowTailViewInstance tailView = processorInstance.getTailViewInstance();
            finalView.addView(tailView);
            finalView = tailView;


            // obtain result set processor
            ResultSetProcessor resultSetProcessor = EPStatementStartMethodHelperAssignExpr.getAssignResultSetProcessor(agentInstanceContext, resultSetProcessorPrototype);


            // Attach output view
            View outputView = outputProcessViewFactory.makeView(resultSetProcessor, agentInstanceContext);
            finalView.addView(outputView);
            finalView = outputView;

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Related Classes of com.espertech.esper.epl.core.ResultSetProcessor

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

com.espertech.esper.core.context.factory.StatementAgentInstanceFactoryOnTrigger

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

com.espertech.esper.core.start.EPStatementStartMethodHelperAssignExpr

com.espertech.esper.core.start.EPStatementStartMethodHelperUtil

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