/**************************************************************************************
* Copyright (C) 2008 EsperTech, Inc. All rights reserved. *
* http://esper.codehaus.org *
* 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.agg.service;
import com.espertech.esper.client.annotation.Hint;
import com.espertech.esper.client.annotation.HintEnum;
import com.espertech.esper.core.context.util.AgentInstanceContext;
import com.espertech.esper.epl.agg.access.AggregationAccessorSlotPair;
import com.espertech.esper.epl.core.MethodResolutionService;
import com.espertech.esper.epl.expression.ExprEvaluator;
import com.espertech.esper.epl.expression.ExprValidationException;
import com.espertech.esper.epl.variable.VariableReader;
import com.espertech.esper.epl.variable.VariableService;
import com.espertech.esper.type.DoubleValue;
import com.espertech.esper.util.JavaClassHelper;
/**
* Implementation for handling aggregation with grouping by group-keys.
*/
public class AggSvcGroupByReclaimAgedFactory extends AggregationServiceFactoryBase
{
private static final long DEFAULT_MAX_AGE_MSEC = 60000L;
protected final AggregationAccessorSlotPair[] accessors;
protected final AggregationStateFactory[] accessAggregations;
protected final boolean isJoin;
protected final AggSvcGroupByReclaimAgedEvalFunc evaluationFunctionMaxAge;
protected final AggSvcGroupByReclaimAgedEvalFunc evaluationFunctionFrequency;
private volatile long currentReclaimFrequency = DEFAULT_MAX_AGE_MSEC;
/**
* Ctor.
* @param evaluators - evaluate the sub-expression within the aggregate function (ie. sum(4*myNum))
* @param prototypes - collect the aggregation state that evaluators evaluate to, act as prototypes for new aggregations
* aggregation states for each group
* @param reclaimGroupAged hint to reclaim
* @param reclaimGroupFrequency hint to reclaim
* @param variableService variables
* @param accessors accessor definitions
* @param accessAggregations access aggs
* @param isJoin true for join, false for single-stream
* @throws com.espertech.esper.epl.expression.ExprValidationException when validation fails
*/
public AggSvcGroupByReclaimAgedFactory(ExprEvaluator evaluators[],
AggregationMethodFactory prototypes[],
Object groupKeyBinding,
Hint reclaimGroupAged,
Hint reclaimGroupFrequency,
final VariableService variableService,
AggregationAccessorSlotPair[] accessors,
AggregationStateFactory[] accessAggregations,
boolean isJoin)
throws ExprValidationException
{
super(evaluators, prototypes, groupKeyBinding);
this.accessors = accessors;
this.accessAggregations = accessAggregations;
this.isJoin = isJoin;
String hintValueMaxAge = HintEnum.RECLAIM_GROUP_AGED.getHintAssignedValue(reclaimGroupAged);
if (hintValueMaxAge == null)
{
throw new ExprValidationException("Required hint value for hint '" + HintEnum.RECLAIM_GROUP_AGED + "' has not been provided");
}
evaluationFunctionMaxAge = getEvaluationFunction(variableService, hintValueMaxAge);
String hintValueFrequency = HintEnum.RECLAIM_GROUP_FREQ.getHintAssignedValue(reclaimGroupAged);
if ((reclaimGroupFrequency == null) || (hintValueFrequency == null))
{
evaluationFunctionFrequency = evaluationFunctionMaxAge;
currentReclaimFrequency = getReclaimFrequency(currentReclaimFrequency);
}
else
{
evaluationFunctionFrequency = getEvaluationFunction(variableService, hintValueFrequency);
}
}
public AggregationService makeService(AgentInstanceContext agentInstanceContext, MethodResolutionService methodResolutionService) {
return new AggSvcGroupByReclaimAgedImpl(evaluators, aggregators, groupKeyBinding, accessors, accessAggregations, isJoin, evaluationFunctionMaxAge, evaluationFunctionFrequency, methodResolutionService);
}
private AggSvcGroupByReclaimAgedEvalFunc getEvaluationFunction(final VariableService variableService, String hintValue)
throws ExprValidationException
{
final VariableReader variableReader = variableService.getReader(hintValue);
if (variableReader != null)
{
if (!JavaClassHelper.isNumeric(variableReader.getType()))
{
throw new ExprValidationException("Variable type of variable '" + variableReader.getVariableName() + "' is not numeric");
}
return new AggSvcGroupByReclaimAgedEvalFuncVariable(variableReader);
}
else
{
Double valueDouble;
try
{
valueDouble = DoubleValue.parseString(hintValue);
}
catch (RuntimeException ex)
{
throw new ExprValidationException("Failed to parse hint parameter value '" + hintValue + "' as a double-typed seconds value or variable name");
}
if (valueDouble <= 0)
{
throw new ExprValidationException("Hint parameter value '" + hintValue + "' is an invalid value, expecting a double-typed seconds value or variable name");
}
return new AggSvcGroupByReclaimAgedEvalFuncConstant(valueDouble);
}
}
private long getReclaimFrequency(long currentReclaimFrequency)
{
Double frequency = evaluationFunctionFrequency.getLongValue();
if ((frequency == null) || (frequency <= 0))
{
return currentReclaimFrequency;
}
return Math.round(frequency * 1000d);
}
}