public static OutputProcessViewFactory Make(StatementSpecCompiled statementSpec, InternalEventRouter internalEventRouter, StatementContext statementContext, EventType resultEventType, OutputProcessViewCallback optionalOutputProcessViewCallback, TableService tableService, ResultSetProcessorType resultSetProcessorType)
{
// determine direct-callback
if (optionalOutputProcessViewCallback != null)
{
return(new OutputProcessViewFactoryCallback(optionalOutputProcessViewCallback));
}
// determine routing
var isRouted = false;
var routeToFront = false;
if (statementSpec.InsertIntoDesc != null)
{
isRouted = true;
routeToFront = statementContext.NamedWindowService.IsNamedWindow(statementSpec.InsertIntoDesc.EventTypeName);
}
OutputStrategyPostProcessFactory outputStrategyPostProcessFactory = null;
if ((statementSpec.InsertIntoDesc != null) || (statementSpec.SelectStreamSelectorEnum == SelectClauseStreamSelectorEnum.RSTREAM_ONLY))
{
SelectClauseStreamSelectorEnum?insertIntoStreamSelector = null;
string tableName = null;
if (statementSpec.InsertIntoDesc != null)
{
insertIntoStreamSelector = statementSpec.InsertIntoDesc.StreamSelector;
var tableMetadata = tableService.GetTableMetadata(statementSpec.InsertIntoDesc.EventTypeName);
if (tableMetadata != null)
{
tableName = tableMetadata.TableName;
EPLValidationUtil.ValidateContextName(true, tableName, tableMetadata.ContextName, statementSpec.OptionalContextName, true);
}
}
outputStrategyPostProcessFactory = new OutputStrategyPostProcessFactory(isRouted, insertIntoStreamSelector, statementSpec.SelectStreamSelectorEnum, internalEventRouter, statementContext.EpStatementHandle, routeToFront, tableService, tableName);
}
// Do we need to enforce an output policy?
var streamCount = statementSpec.StreamSpecs.Length;
var outputLimitSpec = statementSpec.OutputLimitSpec;
var isDistinct = statementSpec.SelectClauseSpec.IsDistinct;
var isGrouped = statementSpec.GroupByExpressions != null && statementSpec.GroupByExpressions.GroupByNodes.Length > 0;
if (outputLimitSpec != null)
{
var evaluatorContextStmt = new ExprEvaluatorContextStatement(statementContext, false);
var validationContext =
new ExprValidationContext(
new StreamTypeServiceImpl(statementContext.EngineURI, false),
statementContext.MethodResolutionService, null,
statementContext.TimeProvider,
statementContext.VariableService,
statementContext.TableService,
evaluatorContextStmt,
statementContext.EventAdapterService,
statementContext.StatementName,
statementContext.StatementId,
statementContext.Annotations,
statementContext.ContextDescriptor,
statementContext.ScriptingService,
false, false, false, false, null, false);
if (outputLimitSpec.AfterTimePeriodExpr != null)
{
var timePeriodExpr = (ExprTimePeriod)ExprNodeUtility.GetValidatedSubtree(ExprNodeOrigin.OUTPUTLIMIT, outputLimitSpec.AfterTimePeriodExpr, validationContext);
outputLimitSpec.AfterTimePeriodExpr = timePeriodExpr;
}
if (outputLimitSpec.TimePeriodExpr != null)
{
var timePeriodExpr = (ExprTimePeriod)ExprNodeUtility.GetValidatedSubtree(ExprNodeOrigin.OUTPUTLIMIT, outputLimitSpec.TimePeriodExpr, validationContext);
outputLimitSpec.TimePeriodExpr = timePeriodExpr;
if (timePeriodExpr.IsConstantResult && timePeriodExpr.EvaluateAsSeconds(null, true, new ExprEvaluatorContextStatement(statementContext, false)) <= 0)
{
throw new ExprValidationException("Invalid time period expression returns a zero or negative time interval");
}
}
}
OutputProcessViewFactory outputProcessViewFactory;
if (outputLimitSpec == null)
{
if (!isDistinct)
{
outputProcessViewFactory = new OutputProcessViewDirectFactory(statementContext, outputStrategyPostProcessFactory);
}
else
{
outputProcessViewFactory = new OutputProcessViewDirectDistinctOrAfterFactory(statementContext, outputStrategyPostProcessFactory, isDistinct, null, null, resultEventType);
}
}
else if (outputLimitSpec.RateType == OutputLimitRateType.AFTER)
{
outputProcessViewFactory = new OutputProcessViewDirectDistinctOrAfterFactory(statementContext, outputStrategyPostProcessFactory, isDistinct, outputLimitSpec.AfterTimePeriodExpr, outputLimitSpec.AfterNumberOfEvents, resultEventType);
}
else
{
try {
var isWithHavingClause = statementSpec.HavingExprRootNode != null;
var isStartConditionOnCreation = HasOnlyTables(statementSpec.StreamSpecs);
var outputConditionFactory = OutputConditionFactoryFactory.CreateCondition(outputLimitSpec, statementContext, isGrouped, isWithHavingClause, isStartConditionOnCreation);
var hasOrderBy = statementSpec.OrderByList != null && statementSpec.OrderByList.Length > 0;
OutputProcessViewConditionFactory.ConditionType conditionType;
var hasAfter = outputLimitSpec.AfterNumberOfEvents != null || outputLimitSpec.AfterTimePeriodExpr != null;
var isUnaggregatedUngrouped = resultSetProcessorType == ResultSetProcessorType.HANDTHROUGH || resultSetProcessorType == ResultSetProcessorType.UNAGGREGATED_UNGROUPED;
// hint checking with order-by
var hasOptHint = HintEnum.ENABLE_OUTPUTLIMIT_OPT.GetHint(statementSpec.Annotations) != null;
if (hasOptHint && hasOrderBy)
{
throw new ExprValidationException("The " + HintEnum.ENABLE_OUTPUTLIMIT_OPT + " hint is not supported with order-by");
}
if (outputLimitSpec.DisplayLimit == OutputLimitLimitType.SNAPSHOT)
{
conditionType = OutputProcessViewConditionFactory.ConditionType.SNAPSHOT;
}
// For FIRST without groups we are using a special logic that integrates the first-flag, in order to still conveniently use all sorts of output conditions.
// FIRST with group-by is handled by setting the output condition to null (OutputConditionNull) and letting the ResultSetProcessor handle first-per-group.
// Without having-clause there is no required order of processing, thus also use regular policy.
else if (outputLimitSpec.DisplayLimit == OutputLimitLimitType.FIRST && statementSpec.GroupByExpressions == null)
{
conditionType = OutputProcessViewConditionFactory.ConditionType.POLICY_FIRST;
}
else if (isUnaggregatedUngrouped && outputLimitSpec.DisplayLimit == OutputLimitLimitType.LAST)
{
conditionType = OutputProcessViewConditionFactory.ConditionType.POLICY_LASTALL_UNORDERED;
}
else if (hasOptHint && outputLimitSpec.DisplayLimit == OutputLimitLimitType.ALL && !hasOrderBy)
{
conditionType = OutputProcessViewConditionFactory.ConditionType.POLICY_LASTALL_UNORDERED;
}
else if (hasOptHint && outputLimitSpec.DisplayLimit == OutputLimitLimitType.LAST && !hasOrderBy)
{
conditionType = OutputProcessViewConditionFactory.ConditionType.POLICY_LASTALL_UNORDERED;
}
else
{
conditionType = OutputProcessViewConditionFactory.ConditionType.POLICY_NONFIRST;
}
var selectClauseStreamSelectorEnum = statementSpec.SelectStreamSelectorEnum;
var terminable = outputLimitSpec.RateType == OutputLimitRateType.TERM || outputLimitSpec.IsAndAfterTerminate;
outputProcessViewFactory = new OutputProcessViewConditionFactory(statementContext, outputStrategyPostProcessFactory, isDistinct, outputLimitSpec.AfterTimePeriodExpr, outputLimitSpec.AfterNumberOfEvents, resultEventType, outputConditionFactory, streamCount, conditionType, outputLimitSpec.DisplayLimit, terminable, hasAfter, isUnaggregatedUngrouped, selectClauseStreamSelectorEnum);
}
catch (Exception ex) {
throw new ExprValidationException("Error in the output rate limiting clause: " + ex.Message, ex);
}
}
return(outputProcessViewFactory);
}
public OutputProcessViewDirect(ResultSetProcessor resultSetProcessor, OutputProcessViewDirectFactory parent)
: base(resultSetProcessor)
{
_parent = parent;
}
public OutputProcessViewDirectPostProcess(ResultSetProcessor resultSetProcessor, OutputProcessViewDirectFactory parent, OutputStrategyPostProcess postProcessor)
: base(resultSetProcessor, parent)
{
_postProcessor = postProcessor;
}
