Examples of com.espertech.esper.epl.named.RemoveStreamViewCapability

com.espertech.esper.epl.named.RemoveStreamViewCapability
View capability requirement that asks views to handle the remove stream posted by parent views, for use with named windows since these allow on-delete removal of events from a window.
Based on being asked to provide the capability, a view factory may need to use a view with a different internal collection to provide a remove stream capability that has good performance, but may come at the cost of lower insert performance as a view may need to build reverse indexes to effeciently remove an event.

    {
        List<View> views = new ArrayList<View>();
        boolean hasAsymetric = false;
        for (ViewFactory viewFactory : viewFactories)
        {
            viewFactory.setProvideCapability(new RemoveStreamViewCapability(true), null);   // require remove stream support for all views
            views.add(viewFactory.makeView(statementContext));
            hasAsymetric |= viewFactory instanceof AsymetricDataWindowViewFactory;
        }
        if (hasAsymetric) {
            return new IntersectAsymetricView(this, parentEventType, views);

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    {
        List<View> views = new ArrayList<View>();
        boolean hasAsymetric = false;
        for (ViewFactory viewFactory : viewFactories)
        {
            viewFactory.setProvideCapability(new RemoveStreamViewCapability(true), null);   // require remove stream support for all views
            views.add(viewFactory.makeView(statementContext));
            hasAsymetric |= viewFactory instanceof AsymetricDataWindowViewFactory;
        }
        if (hasAsymetric) {
            return new IntersectAsymetricView(this, parentEventType, views);

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Related Classes of com.espertech.esper.epl.named.RemoveStreamViewCapability

com.espertech.esper.view.internal.IntersectViewFactory

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