public TableOnMergeHelper(
StatementContext statementContext,
OnTriggerMergeDesc onTriggerDesc,
EventType triggeringEventType,
String triggeringStreamName,
InternalEventRouter internalEventRouter,
TableMetadata tableMetadata)
throws ExprValidationException {
matched = new ArrayList<TableOnMergeMatch>();
unmatched = new ArrayList<TableOnMergeMatch>();
int count = 1;
boolean hasDeleteAction = false;
boolean hasInsertIntoTableAction = false;
boolean hasUpdateAction = false;
for (OnTriggerMergeMatched matchedItem : onTriggerDesc.getItems()) {
List<TableOnMergeAction> actions = new ArrayList<TableOnMergeAction>();
for (OnTriggerMergeAction item : matchedItem.getActions()) {
try {
if (item instanceof OnTriggerMergeActionInsert) {
OnTriggerMergeActionInsert insertDesc = (OnTriggerMergeActionInsert) item;
TableOnMergeActionIns action =
setupInsert(
tableMetadata,
internalEventRouter,
count,
insertDesc,
triggeringEventType,
triggeringStreamName,
statementContext);
actions.add(action);
hasInsertIntoTableAction = action.isInsertIntoBinding();
} else if (item instanceof OnTriggerMergeActionUpdate) {
OnTriggerMergeActionUpdate updateDesc = (OnTriggerMergeActionUpdate) item;
EventBeanUpdateHelper updateHelper =
EventBeanUpdateHelperFactory.make(
tableMetadata.getTableName(),
tableMetadata.getInternalEventType(),
updateDesc.getAssignments(),
onTriggerDesc.getOptionalAsName(),
triggeringEventType,
false);
ExprEvaluator filterEval =
updateDesc.getOptionalWhereClause() == null
? null
: updateDesc.getOptionalWhereClause().getExprEvaluator();
TableUpdateStrategy tableUpdateStrategy =
statementContext
.getTableService()
.getTableUpdateStrategy(tableMetadata, updateHelper, true);
TableOnMergeActionUpd upd = new TableOnMergeActionUpd(filterEval, tableUpdateStrategy);
actions.add(upd);
statementContext
.getTableService()
.addTableUpdateStrategyReceiver(
tableMetadata, statementContext.getStatementName(), upd, updateHelper, true);
hasUpdateAction = true;
} else if (item instanceof OnTriggerMergeActionDelete) {
OnTriggerMergeActionDelete deleteDesc = (OnTriggerMergeActionDelete) item;
ExprEvaluator filterEval =
deleteDesc.getOptionalWhereClause() == null
? null
: deleteDesc.getOptionalWhereClause().getExprEvaluator();
actions.add(new TableOnMergeActionDel(filterEval));
hasDeleteAction = true;
} else {
throw new IllegalArgumentException(
"Invalid type of merge item '" + item.getClass() + "'");
}
count++;
} catch (ExprValidationException ex) {
boolean isNot = item instanceof OnTriggerMergeActionInsert;
String message =
"Validation failed in when-"
+ (isNot ? "not-" : "")
+ "matched (clause "
+ count
+ "): "
+ ex.getMessage();
throw new ExprValidationException(message, ex);
}
}
if (matchedItem.isMatchedUnmatched()) {
matched.add(new TableOnMergeMatch(matchedItem.getOptionalMatchCond(), actions));
} else {
unmatched.add(new TableOnMergeMatch(matchedItem.getOptionalMatchCond(), actions));
}
}
// since updates may change future secondary keys
requiresWriteLock = hasDeleteAction || hasInsertIntoTableAction || hasUpdateAction;
}
private TableOnMergeActionIns setupInsert(
TableMetadata tableMetadata,
InternalEventRouter internalEventRouter,
int selectClauseNumber,
OnTriggerMergeActionInsert desc,
EventType triggeringEventType,
String triggeringStreamName,
StatementContext statementContext)
throws ExprValidationException {
// Compile insert-into info
String streamName =
desc.getOptionalStreamName() != null
? desc.getOptionalStreamName()
: tableMetadata.getTableName();
InsertIntoDesc insertIntoDesc = InsertIntoDesc.fromColumns(streamName, desc.getColumns());
EventType insertIntoTargetType =
streamName.equals(tableMetadata.getTableName())
? tableMetadata.getInternalEventType()
: null;
// rewrite any wildcards to use "stream.wildcard"
if (triggeringStreamName == null) {
triggeringStreamName = UuidGenerator.generate();
}
List<SelectClauseElementCompiled> selectNoWildcard =
NamedWindowOnMergeHelper.compileSelectNoWildcard(
triggeringStreamName, desc.getSelectClauseCompiled());
// Set up event types for select-clause evaluation: The first type does not contain anything as
// its the named window row which is not present for insert
EventType dummyTypeNoProperties =
new MapEventType(
EventTypeMetadata.createAnonymous("merge_named_window_insert"),
"merge_named_window_insert",
0,
null,
Collections.<String, Object>emptyMap(),
null,
null,
null);
EventType[] eventTypes = new EventType[] {dummyTypeNoProperties, triggeringEventType};
String[] streamNames = new String[] {UuidGenerator.generate(), triggeringStreamName};
StreamTypeService streamTypeService =
new StreamTypeServiceImpl(
eventTypes, streamNames, new boolean[1], statementContext.getEngineURI(), false);
// Get select expr processor
SelectExprEventTypeRegistry selectExprEventTypeRegistry =
new SelectExprEventTypeRegistry(
statementContext.getStatementName(), statementContext.getStatementEventTypeRef());
ExprEvaluatorContextStatement exprEvaluatorContext =
new ExprEvaluatorContextStatement(statementContext, false);
SelectExprProcessor insertHelper =
SelectExprProcessorFactory.getProcessor(
Collections.singleton(selectClauseNumber),
selectNoWildcard.toArray(new SelectClauseElementCompiled[selectNoWildcard.size()]),
false,
insertIntoDesc,
insertIntoTargetType,
null,
streamTypeService,
statementContext.getEventAdapterService(),
statementContext.getStatementResultService(),
statementContext.getValueAddEventService(),
selectExprEventTypeRegistry,
statementContext.getMethodResolutionService(),
exprEvaluatorContext,
statementContext.getVariableService(),
statementContext.getTableService(),
statementContext.getTimeProvider(),
statementContext.getEngineURI(),
statementContext.getStatementId(),
statementContext.getStatementName(),
statementContext.getAnnotations(),
statementContext.getContextDescriptor(),
statementContext.getConfigSnapshot(),
null,
statementContext.getNamedWindowService(),
null);
ExprEvaluator filterEval =
desc.getOptionalWhereClause() == null
? null
: desc.getOptionalWhereClause().getExprEvaluator();
InternalEventRouter routerToUser =
streamName.equals(tableMetadata.getTableName()) ? null : internalEventRouter;
boolean audit = AuditEnum.INSERT.getAudit(statementContext.getAnnotations()) != null;
return new TableOnMergeActionIns(
filterEval,
insertHelper,
routerToUser,
statementContext.getEpStatementHandle(),
statementContext.getInternalEventEngineRouteDest(),
audit,
tableMetadata.getRowFactory());
}