@Override
public void preProcessEvent(Map<String, Object> map) {
// remove entries with null values
Iterator<String> iter = map.keySet().iterator();
while (iter.hasNext()) {
if (map.get(iter.next()) == null) {
iter.remove();
}
}
// rename attributes that are esper reserved words
EsperNamingUtils.checkWordsAreLegalEsperNamesInMapKeys(map);
}
// use this method if you only have the input event
private String registerEventOrDefinition(
Event event, Map<String, Object> attributes, EventDefinition inputDef) {
boolean gotInputDef = (inputDef != null);
String escapedEventType;
SortedMap<String, Class> map;
if (gotInputDef) {
map = inputDef.getProperties();
escapedEventType = EsperNamingUtils.checkWordIsLegalEsperName(inputDef.getEventType());
} else if (event == null || attributes == null) {
log.warn("Got null input event or attributes in registerEventOrDefinition");
return null;
} else {
// create map from attributes, throw out nulls
map = new TreeMap<String, Class>();
for (String name : attributes.keySet()) {
Object attr = attributes.get(name);
if (attr == null) continue;
Class propertyClass = attr.getClass();
map.put(name, propertyClass);
}
escapedEventType = EsperNamingUtils.checkWordIsLegalEsperName(event.getEventType());
}
// prepare event signature
String eventSignature = getInputEventSignature(map);
// see if we've seen this event before at all
if (!inputEvents.containsKey(escapedEventType)) {
log.info("registering new event definition: %s", escapedEventType);
addInputEventSignature(escapedEventType, eventSignature);
// first see if we have a pre-existing outputEvent, and if so, we need to merge properties
// in case our new upper level event is narrower than previously registered base event
// TODO: this is just a guard for the case where we have prevOutputDef one level down
// TODO: (it won't help in case for multi-level distance, need to replace this with plugin
// specific handling,
// TODO: to possibly find an ancestor prev def to use)
EventDefinition prevOutputDef = this.getOutputEventDefinition(escapedEventType);
EventDefinition newDef = null;
if (prevOutputDef != null) {
String msg =
String.format(
"detected differences with previously registered outputEvent: %s",
escapedEventType);
if (logPropertyDifferences(msg, prevOutputDef.getProperties(), map)) {
if (gotInputDef) {
// make a copy of def props
map = new TreeMap<String, Class>();
map.putAll(inputDef.getProperties());
updateMapWithPrevOutputProperties(map, prevOutputDef.getProperties());
newDef =
new EventDefinition(
inputDef.getSourceEventClass(), escapedEventType, inputDef.getEvtClass(), map);
} else {
updateMapWithPrevOutputProperties(map, prevOutputDef.getProperties());
newDef = new EventDefinition(event, escapedEventType, event.getClass(), map);
}
String updatedEventSignature = getInputEventSignature(map);
addInputEventSignature(escapedEventType, updatedEventSignature);
}
}
if (newDef == null) {
if (!gotInputDef)
newDef = new EventDefinition(event, escapedEventType, event.getClass(), map);
else newDef = inputDef;
}
inputEvents.put(escapedEventType, newDef);
registerEventStream(newDef);
} else if (eventSignature != null
&& !checkInputEventSignatureRegistered(escapedEventType, eventSignature)) {
log.info("got new signature for event type: %s", escapedEventType);
// see if we have a new variant signature for a previously registered event
if (gotInputDef) {
// make a copy of def props
map = new TreeMap<String, Class>();
map.putAll(inputDef.getProperties());
}
String combinedEventSignature = null;
EventDefinition prevDef = inputEvents.get(escapedEventType);
String msg = String.format("detected updated event definition: %s", escapedEventType);
if (logPropertyDifferences(msg, prevDef.getProperties(), map)) {
map.putAll(prevDef.getProperties());
combinedEventSignature = getInputEventSignature(map);
} else {
combinedEventSignature = eventSignature;
}
if (!checkInputEventSignatureRegistered(escapedEventType, combinedEventSignature)) {
log.info("updating event definition registration: %s", escapedEventType);
addInputEventSignature(escapedEventType, combinedEventSignature);
EventDefinition combinedDef;
if (gotInputDef) {
combinedDef =
new EventDefinition(
inputDef.getSourceEventClass(), escapedEventType, inputDef.getEvtClass(), map);
} else {
combinedDef = new EventDefinition(event, escapedEventType, event.getClass(), map);
}
inputEvents.put(escapedEventType, combinedDef);
updateEventStream(combinedDef);
}
addInputEventSignature(escapedEventType, eventSignature);
} else if (!inputEventRegistrationsValid.contains(escapedEventType)) {
// this is a previously registered stream, but no currently valid EPL statements
log.info("revalidating event type: %s", escapedEventType);
inputEventRegistrationsValid.add(escapedEventType);
notifyEventRegistered(inputEvents.get(escapedEventType));
}
return escapedEventType;
}