public EventRowRegexNFAViewFactory MakeViewFactory(
ViewFactoryChain viewFactoryChain,
MatchRecognizeSpec matchRecognizeSpec,
AgentInstanceContext agentInstanceContext,
bool isUnbound,
Attribute[] annotations,
ConfigurationEngineDefaults.MatchRecognizeConfig matchRecognizeConfigs)
{
return(new EventRowRegexNFAViewFactory(
_container,
viewFactoryChain,
matchRecognizeSpec,
agentInstanceContext,
isUnbound,
annotations,
matchRecognizeConfigs));
}
/// <summary>
/// Ctor.
/// </summary>
/// <param name="viewChain">views</param>
/// <param name="matchRecognizeSpec">specification</param>
/// <param name="agentInstanceContext">The agent instance context.</param>
/// <param name="isUnbound">true for unbound stream</param>
/// <param name="annotations">annotations</param>
/// <exception cref="ExprValidationException">
/// Variable ' + defineItem.Identifier + ' has already been defined
/// or
/// An aggregate function may not appear in a DEFINE clause
/// or
/// Failed to validate condition expression for variable ' + defineItem.Identifier + ': + ex.Message
/// or
/// Aggregation functions in the measure-clause must only refer to properties of exactly one group variable returning multiple events
/// or
/// Aggregation functions in the measure-clause must refer to one or more properties of exactly one group variable returning multiple events
/// or
/// The measures clause requires that each expression utilizes the AS keyword to assign a column name
/// </exception>
/// <throws>ExprValidationException if validation fails</throws>
public EventRowRegexNFAViewFactory(
ViewFactoryChain viewChain,
MatchRecognizeSpec matchRecognizeSpec,
AgentInstanceContext agentInstanceContext,
bool isUnbound,
Attribute[] annotations,
ConfigurationEngineDefaults.MatchRecognizeConfig matchRecognizeConfig)
{
var parentViewType = viewChain.EventType;
_matchRecognizeSpec = matchRecognizeSpec;
_isUnbound = isUnbound;
_isIterateOnly = HintEnum.ITERATE_ONLY.GetHint(annotations) != null;
_matchRecognizeConfig = matchRecognizeConfig;
var statementContext = agentInstanceContext.StatementContext;
// Expand repeats and permutations
_expandedPatternNode = RegexPatternExpandUtil.Expand(matchRecognizeSpec.Pattern);
// Determine single-row and multiple-row variables
_variablesSingle = new LinkedHashSet <string>();
ISet <string> variablesMultiple = new LinkedHashSet <string>();
EventRowRegexHelper.RecursiveInspectVariables(_expandedPatternNode, false, _variablesSingle, variablesMultiple);
// each variable gets associated with a stream number (multiple-row variables as well to hold the current event for the expression).
var streamNum = 0;
_variableStreams = new LinkedHashMap <string, Pair <int, bool> >();
foreach (var variableSingle in _variablesSingle)
{
_variableStreams.Put(variableSingle, new Pair <int, bool>(streamNum, false));
streamNum++;
}
foreach (var variableMultiple in variablesMultiple)
{
_variableStreams.Put(variableMultiple, new Pair <int, bool>(streamNum, true));
streamNum++;
}
// mapping of stream to variable
_streamVariables = new SortedDictionary <int, string>();
foreach (var entry in _variableStreams)
{
_streamVariables.Put(entry.Value.First, entry.Key);
}
// determine visibility rules
var visibility = EventRowRegexHelper.DetermineVisibility(_expandedPatternNode);
// assemble all single-row variables for expression validation
var allStreamNames = new string[_variableStreams.Count];
var allTypes = new EventType[_variableStreams.Count];
streamNum = 0;
foreach (var variableSingle in _variablesSingle)
{
allStreamNames[streamNum] = variableSingle;
allTypes[streamNum] = parentViewType;
streamNum++;
}
foreach (var variableMultiple in variablesMultiple)
{
allStreamNames[streamNum] = variableMultiple;
allTypes[streamNum] = parentViewType;
streamNum++;
}
// determine type service for use with DEFINE
// validate each DEFINE clause expression
ISet <string> definedVariables = new HashSet <string>();
IList <ExprAggregateNode> aggregateNodes = new List <ExprAggregateNode>();
var exprEvaluatorContext = new ExprEvaluatorContextStatement(statementContext, false);
_isExprRequiresMultimatchState = new bool[_variableStreams.Count];
for (var defineIndex = 0; defineIndex < matchRecognizeSpec.Defines.Count; defineIndex++)
{
var defineItem = matchRecognizeSpec.Defines[defineIndex];
if (definedVariables.Contains(defineItem.Identifier))
{
throw new ExprValidationException("Variable '" + defineItem.Identifier + "' has already been defined");
}
definedVariables.Add(defineItem.Identifier);
// stream-type visibilities handled here
var typeServiceDefines = EventRowRegexNFAViewFactoryHelper.BuildDefineStreamTypeServiceDefine(statementContext, _variableStreams, defineItem, visibility, parentViewType);
var exprNodeResult = HandlePreviousFunctions(defineItem.Expression);
var validationContext = new ExprValidationContext(
typeServiceDefines,
statementContext.EngineImportService,
statementContext.StatementExtensionServicesContext, null,
statementContext.SchedulingService,
statementContext.VariableService,
statementContext.TableService, exprEvaluatorContext,
statementContext.EventAdapterService,
statementContext.StatementName,
statementContext.StatementId,
statementContext.Annotations,
statementContext.ContextDescriptor,
statementContext.ScriptingService,
true, false, true, false, null, false);
ExprNode validated;
try {
// validate
validated = ExprNodeUtility.GetValidatedSubtree(ExprNodeOrigin.MATCHRECOGDEFINE, exprNodeResult, validationContext);
// check aggregates
defineItem.Expression = validated;
ExprAggregateNodeUtil.GetAggregatesBottomUp(validated, aggregateNodes);
if (!aggregateNodes.IsEmpty())
{
throw new ExprValidationException("An aggregate function may not appear in a DEFINE clause");
}
}
catch (ExprValidationException ex) {
throw new ExprValidationException("Failed to validate condition expression for variable '" + defineItem.Identifier + "': " + ex.Message, ex);
}
// determine access to event properties from multi-matches
var visitor = new ExprNodeStreamRequiredVisitor();
validated.Accept(visitor);
var streamsRequired = visitor.StreamsRequired;
foreach (var streamRequired in streamsRequired)
{
if (streamRequired >= _variableStreams.Count)
{
var streamNumIdent = _variableStreams.Get(defineItem.Identifier).First;
_isExprRequiresMultimatchState[streamNumIdent] = true;
break;
}
}
}
_isDefineAsksMultimatches = CollectionUtil.IsAnySet(_isExprRequiresMultimatchState);
_defineMultimatchEventBean = _isDefineAsksMultimatches ? EventRowRegexNFAViewFactoryHelper.GetDefineMultimatchBean(statementContext, _variableStreams, parentViewType) : null;
// assign "prev" node indexes
// Since an expression such as "prior(2, price), prior(8, price)" translates into {2, 8} the relative index is {0, 1}.
// Map the expression-supplied index to a relative index
var countPrev = 0;
foreach (var entry in _callbacksPerIndex)
{
foreach (var callback in entry.Value)
{
callback.AssignedIndex = countPrev;
}
countPrev++;
}
// determine type service for use with MEASURE
IDictionary <string, object> measureTypeDef = new LinkedHashMap <string, object>();
foreach (var variableSingle in _variablesSingle)
{
measureTypeDef.Put(variableSingle, parentViewType);
}
foreach (var variableMultiple in variablesMultiple)
{
measureTypeDef.Put(variableMultiple, new EventType[] { parentViewType });
}
var outputEventTypeName = statementContext.StatementId + "_rowrecog";
_compositeEventType = (ObjectArrayEventType)statementContext.EventAdapterService.CreateAnonymousObjectArrayType(outputEventTypeName, measureTypeDef);
StreamTypeService typeServiceMeasure = new StreamTypeServiceImpl(_compositeEventType, "MATCH_RECOGNIZE", true, statementContext.EngineURI);
// find MEASURE clause aggregations
var measureReferencesMultivar = false;
IList <ExprAggregateNode> measureAggregateExprNodes = new List <ExprAggregateNode>();
foreach (var measureItem in matchRecognizeSpec.Measures)
{
ExprAggregateNodeUtil.GetAggregatesBottomUp(measureItem.Expr, measureAggregateExprNodes);
}
if (!measureAggregateExprNodes.IsEmpty())
{
var isIStreamOnly = new bool[allStreamNames.Length];
CompatExtensions.Fill(isIStreamOnly, true);
var typeServiceAggregateMeasure = new StreamTypeServiceImpl(allTypes, allStreamNames, isIStreamOnly, statementContext.EngineURI, false);
var measureExprAggNodesPerStream = new Dictionary <int, IList <ExprAggregateNode> >();
foreach (var aggregateNode in measureAggregateExprNodes)
{
// validate absence of group-by
aggregateNode.ValidatePositionals();
if (aggregateNode.OptionalLocalGroupBy != null)
{
throw new ExprValidationException("Match-recognize does not allow aggregation functions to specify a group-by");
}
// validate node and params
var count = 0;
var visitor = new ExprNodeIdentifierVisitor(true);
var validationContext = new ExprValidationContext(
typeServiceAggregateMeasure,
statementContext.EngineImportService,
statementContext.StatementExtensionServicesContext, null,
statementContext.SchedulingService,
statementContext.VariableService,
statementContext.TableService,
exprEvaluatorContext,
statementContext.EventAdapterService,
statementContext.StatementName,
statementContext.StatementId,
statementContext.Annotations,
statementContext.ContextDescriptor,
statementContext.ScriptingService,
false, false, true, false, null, false);
for (int ii = 0; ii < aggregateNode.ChildNodes.Count; ii++)
{
var child = aggregateNode.ChildNodes[ii];
var validated = ExprNodeUtility.GetValidatedSubtree(ExprNodeOrigin.MATCHRECOGMEASURE, child, validationContext);
validated.Accept(visitor);
aggregateNode.SetChildNode(count++, new ExprNodeValidated(validated));
}
validationContext = new ExprValidationContext(
typeServiceMeasure,
statementContext.EngineImportService,
statementContext.StatementExtensionServicesContext, null,
statementContext.SchedulingService,
statementContext.VariableService,
statementContext.TableService,
exprEvaluatorContext,
statementContext.EventAdapterService,
statementContext.StatementName,
statementContext.StatementId,
statementContext.Annotations,
statementContext.ContextDescriptor,
statementContext.ScriptingService,
false, false, true, false, null, false);
aggregateNode.Validate(validationContext);
// verify properties used within the aggregation
var aggregatedStreams = new HashSet <int>();
foreach (var pair in visitor.ExprProperties)
{
aggregatedStreams.Add(pair.First);
}
int?multipleVarStream = null;
foreach (int streamNumAggregated in aggregatedStreams)
{
var variable = _streamVariables.Get(streamNumAggregated);
if (variablesMultiple.Contains(variable))
{
measureReferencesMultivar = true;
if (multipleVarStream == null)
{
multipleVarStream = streamNumAggregated;
continue;
}
throw new ExprValidationException("Aggregation functions in the measure-clause must only refer to properties of exactly one group variable returning multiple events");
}
}
if (multipleVarStream == null)
{
throw new ExprValidationException("Aggregation functions in the measure-clause must refer to one or more properties of exactly one group variable returning multiple events");
}
var aggNodesForStream = measureExprAggNodesPerStream.Get(multipleVarStream.Value);
if (aggNodesForStream == null)
{
aggNodesForStream = new List <ExprAggregateNode>();
measureExprAggNodesPerStream.Put(multipleVarStream.Value, aggNodesForStream);
}
aggNodesForStream.Add(aggregateNode);
}
var factoryDesc = AggregationServiceFactoryFactory.GetServiceMatchRecognize(_streamVariables.Count, measureExprAggNodesPerStream, typeServiceAggregateMeasure.EventTypes);
_aggregationService = factoryDesc.AggregationServiceFactory.MakeService(agentInstanceContext);
_aggregationExpressions = factoryDesc.Expressions;
}
else
{
_aggregationService = null;
_aggregationExpressions = Collections.GetEmptyList <AggregationServiceAggExpressionDesc>();
}
// validate each MEASURE clause expression
IDictionary <string, object> rowTypeDef = new LinkedHashMap <string, object>();
var streamRefVisitor = new ExprNodeStreamUseCollectVisitor();
foreach (var measureItem in matchRecognizeSpec.Measures)
{
if (measureItem.Name == null)
{
throw new ExprValidationException("The measures clause requires that each expression utilizes the AS keyword to assign a column name");
}
var validated = ValidateMeasureClause(measureItem.Expr, typeServiceMeasure, variablesMultiple, _variablesSingle, statementContext);
measureItem.Expr = validated;
rowTypeDef.Put(measureItem.Name, validated.ExprEvaluator.ReturnType);
validated.Accept(streamRefVisitor);
}
// Determine if any of the multi-var streams are referenced in the measures (non-aggregated only)
foreach (var @ref in streamRefVisitor.Referenced)
{
var rootPropName = @ref.RootPropertyNameIfAny;
if (rootPropName != null)
{
if (variablesMultiple.Contains(rootPropName))
{
measureReferencesMultivar = true;
break;
}
}
var streamRequired = @ref.StreamReferencedIfAny;
if (streamRequired != null)
{
var streamVariable = _streamVariables.Get(streamRequired.Value);
if (streamVariable != null)
{
var def = _variableStreams.Get(streamVariable);
if (def != null && def.Second)
{
measureReferencesMultivar = true;
break;
}
}
}
}
_isCollectMultimatches = measureReferencesMultivar || _isDefineAsksMultimatches;
// create rowevent type
var rowEventTypeName = statementContext.StatementId + "_rowrecogrow";
_rowEventType = statementContext.EventAdapterService.CreateAnonymousMapType(rowEventTypeName, rowTypeDef, true);
// validate partition-by expressions, if any
if (!matchRecognizeSpec.PartitionByExpressions.IsEmpty())
{
var typeServicePartition = new StreamTypeServiceImpl(parentViewType, "MATCH_RECOGNIZE_PARTITION", true, statementContext.EngineURI);
var validated = new List <ExprNode>();
var validationContext = new ExprValidationContext(
typeServicePartition,
statementContext.EngineImportService,
statementContext.StatementExtensionServicesContext, null,
statementContext.SchedulingService, statementContext.VariableService, statementContext.TableService,
exprEvaluatorContext, statementContext.EventAdapterService, statementContext.StatementName,
statementContext.StatementId, statementContext.Annotations, statementContext.ContextDescriptor,
statementContext.ScriptingService,
false, false, true, false, null, false);
foreach (var partitionExpr in matchRecognizeSpec.PartitionByExpressions)
{
validated.Add(ExprNodeUtility.GetValidatedSubtree(ExprNodeOrigin.MATCHRECOGPARTITION, partitionExpr, validationContext));
}
matchRecognizeSpec.PartitionByExpressions = validated;
}
// validate interval if present
if (matchRecognizeSpec.Interval != null)
{
var validationContext =
new ExprValidationContext(
new StreamTypeServiceImpl(statementContext.EngineURI, false),
statementContext.EngineImportService,
statementContext.StatementExtensionServicesContext, null,
statementContext.SchedulingService,
statementContext.VariableService, statementContext.TableService, exprEvaluatorContext,
statementContext.EventAdapterService, statementContext.StatementName, statementContext.StatementId,
statementContext.Annotations, statementContext.ContextDescriptor, statementContext.ScriptingService,
false, false, true, false, null, false);
matchRecognizeSpec.Interval.Validate(validationContext);
}
}
