com.espertech.esper.epl.variable.OnSetVariableViewFactory Maven / Gradle / Ivy

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Complex event processing and event series analysis component
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/*
 ***************************************************************************************
 *  Copyright (C) 2006 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.variable;

import com.espertech.esper.client.EventType;
import com.espertech.esper.core.service.StatementResultService;
import com.espertech.esper.epl.expression.core.ExprEvaluatorContext;
import com.espertech.esper.epl.expression.core.ExprValidationException;
import com.espertech.esper.epl.spec.OnTriggerSetDesc;
import com.espertech.esper.event.EventAdapterService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * A factory for a view that handles the setting of variables upon receipt of a triggering event.
 */
public class OnSetVariableViewFactory {
    private static final Logger log = LoggerFactory.getLogger(OnSetVariableViewFactory.class);
    private final EventAdapterService eventAdapterService;
    private final VariableService variableService;
    private final EventType eventType;
    private VariableReadWritePackage variableReadWritePackage;
    private final StatementResultService statementResultService;

    /**
     * Ctor.
     *
     * @param desc                   specification for the on-set statement
     * @param eventAdapterService    for creating statements
     * @param variableService        for setting variables
     * @param statementResultService for coordinating on whether insert and remove stream events should be posted
     * @param exprEvaluatorContext   context for expression evalauation
     * @param statementId            statement id
     * @throws com.espertech.esper.epl.expression.core.ExprValidationException if the assignment expressions are invalid
     */
    public OnSetVariableViewFactory(int statementId, OnTriggerSetDesc desc, EventAdapterService eventAdapterService, VariableService variableService, StatementResultService statementResultService, ExprEvaluatorContext exprEvaluatorContext)
            throws ExprValidationException {
        this.eventAdapterService = eventAdapterService;
        this.variableService = variableService;
        this.statementResultService = statementResultService;

        variableReadWritePackage = new VariableReadWritePackage(desc.getAssignments(), variableService, eventAdapterService);
        String outputEventTypeName = statementId + "_outsetvar";
        eventType = eventAdapterService.createAnonymousMapType(outputEventTypeName, variableReadWritePackage.getVariableTypes(), true);
    }

    public OnSetVariableView instantiate(ExprEvaluatorContext exprEvaluatorContext) {
        return new OnSetVariableView(this, exprEvaluatorContext);
    }

    public EventType getEventType() {
        return eventType;
    }

    public EventAdapterService getEventAdapterService() {
        return eventAdapterService;
    }

    public VariableService getVariableService() {
        return variableService;
    }

    public VariableReadWritePackage getVariableReadWritePackage() {
        return variableReadWritePackage;
    }

    public StatementResultService getStatementResultService() {
        return statementResultService;
    }
}