Examples of com.espertech.esper.epl.variable.VariableReader

Package com.espertech.esper.epl.variable

Examples of com.espertech.esper.epl.variable.VariableReader

com.espertech.esper.epl.variable.VariableReader
Reads and writes variable values.
Works closely with {@link VariableService} in determining the version to read.

        this.agentInstanceContext = agentInstanceContext;


        if (variableNames != null && !variableNames.isEmpty()) {
            for (String variable : variableNames) {
                final VariableService variableService = agentInstanceContext.getStatementContext().getVariableService();
                final VariableReader reader = variableService.getReader(variable);
                agentInstanceContext.getStatementContext().getVariableService().registerCallback(reader.getVariableNumber(), this);
                agentInstanceContext.getTerminationCallbacks().add(new StopCallback() {
                    public void stop() {
                        variableService.unregisterCallback(reader.getVariableNumber(), ExpressionViewBase.this);
                    }
                });
            }


            ScheduleHandleCallback callback = new ScheduleHandleCallback() {

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    }


    public void stopScheduleAndVar() {
        if (variableNames != null && !variableNames.isEmpty()) {
            for (String variable : variableNames) {
                VariableReader reader = agentInstanceContext.getStatementContext().getVariableService().getReader(variable);
                if (reader != null) {
                    agentInstanceContext.getStatementContext().getVariableService().unregisterCallback(reader.getVariableNumber(), this);
                }
            }


            if (agentInstanceContext.getStatementContext().getSchedulingService().isScheduled(scheduleHandle)) {
                agentInstanceContext.getStatementContext().getSchedulingService().remove(scheduleHandle, scheduleSlot);

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            exprDotNodeFilterAnalyzerDesc = evals.getFilterAnalyzerDesc();
            return;
        }


        // If variable then resolve as such
        VariableReader variableReader = validationContext.getVariableService().getReader(firstItem.getName());
        if (variableReader != null) {
            ExprDotEvalTypeInfo typeInfo;
            ExprDotStaticMethodWrap wrap;
            if (variableReader.getType().isArray()) {
                typeInfo = ExprDotEvalTypeInfo.componentColl(variableReader.getType().getComponentType());
                wrap = new ExprDotStaticMethodWrapArrayScalar(variableReader.getVariableName(), variableReader.getType().getComponentType());
            }
            else if (variableReader.getEventType() != null) {
                typeInfo = ExprDotEvalTypeInfo.event(variableReader.getEventType());
                wrap = null;
            }
            else {
                typeInfo = ExprDotEvalTypeInfo.scalarOrUnderlying(variableReader.getType());
                wrap = null;
            }


            ExprDotNodeRealizedChain evals = ExprDotNodeUtility.getChainEvaluators(typeInfo, modifiedChain, validationContext, false, new ExprDotNodeFilterAnalyzerInputStatic());
            exprEvaluator = new ExprDotEvalVariable(variableReader, wrap, evals.getChainWithUnpack());

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        this.unmatchedListener = listener;
    }


    public void setVariableValue(String variableName, Object variableValue) throws EPException
    {
        VariableReader reader = services.getVariableService().getReader(variableName);
        if (reader == null) {
            throw new VariableNotFoundException("Variable by name '" + variableName + "' has not been declared");
        }
        if (reader.isConstant()) {
            throw new VariableConstantValueException("Variable by name '" + variableName + "' is declared as constant and may not be assigned a new value");
        }


        services.getVariableService().getReadWriteLock().writeLock().lock();
        try {
            services.getVariableService().checkAndWrite(reader.getVariableNumber(), variableValue);
            services.getVariableService().commit();
        }
        finally {
            services.getVariableService().getReadWriteLock().writeLock().unlock();
        }

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    {
        // verify
        for (Map.Entry<String, Object> entry : variableValues.entrySet())
        {
            String variableName = entry.getKey();
            VariableReader reader = services.getVariableService().getReader(variableName);
            if (reader == null) {
                throw new VariableNotFoundException("Variable by name '" + variableName + "' has not been declared");
            }
            if (reader.isConstant()) {
                throw new VariableConstantValueException("Variable by name '" + variableName + "' is declared as constant and may not be assigned a new value");
            }
        }


        // set values
        services.getVariableService().getReadWriteLock().writeLock().lock();
        try {
            for (Map.Entry<String, Object> entry : variableValues.entrySet())
            {
                String variableName = entry.getKey();
                VariableReader reader = services.getVariableService().getReader(variableName);
                try
                {
                    services.getVariableService().checkAndWrite(reader.getVariableNumber(), entry.getValue());
                }
                catch (RuntimeException ex)
                {
                    services.getVariableService().rollback();
                    throw ex;

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    }


    public Object getVariableValue(String variableName) throws EPException
    {
        services.getVariableService().setLocalVersion();
        VariableReader reader = services.getVariableService().getReader(variableName);
        if (reader == null) {
            throw new VariableNotFoundException("Variable by name '" + variableName + "' has not been declared");
        }
        Object value = reader.getValue();
        if (value == null || reader.getEventType() == null) {
            return value;
        }
        return ((EventBean) value).getUnderlying();
    }

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    {
        services.getVariableService().setLocalVersion();
        Map<String, Object> values = new HashMap<String, Object>();
        for (String variableName : variableNames)
        {
            VariableReader reader = services.getVariableService().getReader(variableName);
            if (reader == null)
            {
                throw new VariableNotFoundException("Variable by name '" + variableName + "' has not been declared");
            }


            Object value = reader.getValue();
            if (value != null && reader.getEventType() != null) {
                value = ((EventBean) value).getUnderlying();
            }
            values.put(variableName, value);
        }
        return values;

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        return values;
    }


    public Class getVariableType(String variableName)
    {
        VariableReader reader = services.getVariableService().getReader(variableName);
        if (reader == null)
        {
            return null;
        }
        return reader.getType();
    }

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            if ((statements != null) && (!statements.isEmpty())) {
                throw new ConfigurationException("Variable '" + name + "' is in use by one or more statements");
            }
        }


        VariableReader reader = variableService.getReader(name);
        if (reader == null)
        {
            return false;
        }

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