Java ViewServiceCreateResult类代码示例

import com.espertech.esper.view.ViewServiceCreateResult; //导入依赖的package包/类
public SubSelectStrategyRealization instantiate(final EPServicesContext services,
                                             Viewable viewableRoot,
                                             final AgentInstanceContext agentInstanceContext,
                                             List<StopCallback> stopCallbackList) {

    List<ViewFactory> viewFactoryChain = subSelectHolder.getViewFactoryChain().getViewFactoryChain();

    // add "prior" view factory
    boolean hasPrior = viewResourceDelegate.getPerStream()[0].getPriorRequests() != null && !viewResourceDelegate.getPerStream()[0].getPriorRequests().isEmpty();
    if (hasPrior) {
        PriorEventViewFactory priorEventViewFactory = EPStatementStartMethodHelperPrior.getPriorEventViewFactory(agentInstanceContext.getStatementContext(), 1024 + subqueryNumber, viewFactoryChain.size() + 1, viewFactoryChain.isEmpty());
        viewFactoryChain = new ArrayList<ViewFactory>(viewFactoryChain);
        viewFactoryChain.add(priorEventViewFactory);
    }

    // create factory chain context to hold callbacks specific to "prior" and "prev"
    AgentInstanceViewFactoryChainContext viewFactoryChainContext = AgentInstanceViewFactoryChainContext.create(viewFactoryChain, agentInstanceContext, viewResourceDelegate.getPerStream()[0]);

    ViewServiceCreateResult createResult = services.getViewService().createViews(viewableRoot, viewFactoryChain, viewFactoryChainContext, false);
    final Viewable subselectView = createResult.getFinalViewable();

    // create index/holder table
    final EventTable index = pair.getFirst().makeEventTable();
    stopCallbackList.add(new SubqueryStopCallback(index));

    // create strategy
    SubordTableLookupStrategy strategy = pair.getSecond().makeStrategy(index);
    SubselectAggregationPreprocessor subselectAggregationPreprocessor = null;

    // handle "prior" nodes and their strategies
    Map<ExprPriorNode, ExprPriorEvalStrategy> priorNodeStrategies = EPStatementStartMethodHelperPrior.compilePriorNodeStrategies(viewResourceDelegate, new AgentInstanceViewFactoryChainContext[]{viewFactoryChainContext});

    // handle "previous" nodes and their strategies
    Map<ExprPreviousNode, ExprPreviousEvalStrategy> previousNodeStrategies = EPStatementStartMethodHelperPrevious.compilePreviousNodeStrategies(viewResourceDelegate, new AgentInstanceViewFactoryChainContext[]{viewFactoryChainContext});

    AggregationService aggregationService = null;
    if (aggregationServiceFactory != null) {
        aggregationService = aggregationServiceFactory.getAggregationServiceFactory().makeService(agentInstanceContext, agentInstanceContext.getStatementContext().getMethodResolutionService());

        if (!correlatedSubquery) {
            SubselectAggregatorView aggregatorView = new SubselectAggregatorView(aggregationService, filterExprEval, agentInstanceContext);
            subselectView.addView(aggregatorView);

            preload(services, null, aggregatorView, agentInstanceContext);

            return new SubSelectStrategyRealization(NULL_ROW_STRATEGY, null, aggregationService, priorNodeStrategies, previousNodeStrategies, subselectView, null);
        }
        else {
            subselectAggregationPreprocessor = new SubselectAggregationPreprocessor(aggregationService, filterExprEval);
        }
    }

    // preload
    preload(services, index, subselectView, agentInstanceContext);
    StatementAgentInstancePostLoad postLoad = new StatementAgentInstancePostLoad() {
        public void executePostLoad() {
            preload(services, index, subselectView, agentInstanceContext);
        }
    };

    BufferView bufferView = new BufferView(subSelectHolder.getStreamNumber());
    bufferView.setObserver(new SubselectBufferObserver(index));
    subselectView.addView(bufferView);

    return new SubSelectStrategyRealization(strategy, subselectAggregationPreprocessor, aggregationService, priorNodeStrategies, previousNodeStrategies, subselectView, postLoad);
}