com.espertech.esper.epl.table.onaction.TableOnSelectView Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of esper Show documentation
Complex event processing and event series analysis component
There is a newer version: 7.1.0
/*
 * *************************************************************************************
 *  Copyright (C) 2006-2015 EsperTech, Inc. All rights reserved.                       *
 *  http://www.espertech.com/esper                                                     *
 *  http://www.espertech.com                                                           *
 *  ---------------------------------------------------------------------------------- *
 *  The software in this package is published under the terms of the GPL license       *
 *  a copy of which has been included with this distribution in the license.txt file.  *
 * *************************************************************************************
 */

package com.espertech.esper.epl.table.onaction;

import com.espertech.esper.client.EventBean;
import com.espertech.esper.client.EventType;
import com.espertech.esper.collection.MultiKey;
import com.espertech.esper.collection.UniformPair;
import com.espertech.esper.epl.core.ResultSetProcessor;
import com.espertech.esper.epl.expression.core.ExprEvaluatorContext;
import com.espertech.esper.epl.lookup.SubordWMatchExprLookupStrategy;
import com.espertech.esper.epl.named.NamedWindowOnSelectView;
import com.espertech.esper.epl.spec.OnTriggerType;
import com.espertech.esper.epl.table.mgmt.TableMetadata;
import com.espertech.esper.epl.table.mgmt.TableStateInstance;
import com.espertech.esper.event.EventBeanUtility;
import com.espertech.esper.metrics.instrumentation.InstrumentationHelper;
import com.espertech.esper.util.AuditPath;

import java.util.Collections;
import java.util.Iterator;
import java.util.Set;

public class TableOnSelectView extends TableOnViewBase {

    private final TableOnSelectViewFactory parent;
    private final ResultSetProcessor resultSetProcessor;
    private final boolean audit;
    private final boolean deleteAndSelect;

    public TableOnSelectView(SubordWMatchExprLookupStrategy lookupStrategy, TableStateInstance rootView, ExprEvaluatorContext exprEvaluatorContext, TableMetadata metadata,
                             TableOnSelectViewFactory parent, ResultSetProcessor resultSetProcessor, boolean audit, boolean deleteAndSelect) {
        super(lookupStrategy, rootView, exprEvaluatorContext, metadata, deleteAndSelect);
        this.parent = parent;
        this.resultSetProcessor = resultSetProcessor;
        this.audit = audit;
        this.deleteAndSelect = deleteAndSelect;
    }

    public void handleMatching(EventBean[] triggerEvents, EventBean[] matchingEvents) {
        if (InstrumentationHelper.ENABLED) { InstrumentationHelper.get().qInfraOnAction(OnTriggerType.ON_SELECT, triggerEvents, matchingEvents);}

        EventBean[] newData;

        // clear state from prior results
        resultSetProcessor.clear();

        // build join result
        // use linked hash set to retain order of join results for last/first/window to work most intuitively
        Set> newEvents = NamedWindowOnSelectView.buildJoinResult(triggerEvents, matchingEvents);

        // process matches
        UniformPair pair = resultSetProcessor.processJoinResult(newEvents, Collections.>emptySet(), false);
        newData = (pair != null ? pair.getFirst() : null);

        if (parent.isDistinct()) {
            newData = EventBeanUtility.getDistinctByProp(newData, parent.getEventBeanReader());
        }

        if (parent.getInternalEventRouter() != null)
        {
            if (newData != null)
            {
                for (int i = 0; i < newData.length; i++)
                {
                    if (audit) {
                        AuditPath.auditInsertInto(getExprEvaluatorContext().getEngineURI(), getExprEvaluatorContext().getStatementName(), newData[i]);
                    }
                    parent.getInternalEventRouter().route(newData[i], parent.getStatementHandle(), parent.getInternalEventRouteDest(), getExprEvaluatorContext(), false);
                }
            }
        }

        // The on-select listeners receive the events selected
        if ((newData != null) && (newData.length > 0))
        {
            // And post only if we have listeners/subscribers that need the data
            if (parent.getStatementResultService().isMakeNatural() || parent.getStatementResultService().isMakeSynthetic())
            {
                updateChildren(newData, null);
            }
        }

        // clear state from prior results
        resultSetProcessor.clear();

        // Events to delete are indicated via old data
        if (deleteAndSelect) {
            for (EventBean event : matchingEvents) {
                tableStateInstance.deleteEvent(event);
            }
        }

        if (InstrumentationHelper.ENABLED) { InstrumentationHelper.get().aInfraOnAction();}
    }

    @Override
    public EventType getEventType()
    {
        if (resultSetProcessor != null)
        {
            return resultSetProcessor.getResultEventType();
        }
        else
        {
            return super.getEventType();
        }
    }
}