/** Submit results to index and return the queue messages to be ack'd */
private List<QueueMessage> submitToIndex(List<IndexEventResult> indexEventResults) {
// if nothing came back then return empty list
if (indexEventResults == null) {
return new ArrayList<>(0);
}
IndexOperationMessage combined = new IndexOperationMessage();
List<QueueMessage> queueMessages =
indexEventResults
.stream()
// filter out messages that are not present, they were not processed and put into the
// results
.filter(result -> result.getQueueMessage().isPresent())
.map(
indexEventResult -> {
// record the cycle time
messageCycle.update(
System.currentTimeMillis() - indexEventResult.getCreationTime());
// ingest each index op into our combined, single index op for the index producer
if (indexEventResult.getIndexOperationMessage().isPresent()) {
combined.ingest(indexEventResult.getIndexOperationMessage().get());
}
return indexEventResult.getQueueMessage().get();
})
// collect into a list of QueueMessages that can be ack'd later
.collect(Collectors.toList());
queueIndexOperationMessage(combined);
return queueMessages;
}
/**
* calls the event handlers and returns a result with information on whether it needs to be ack'd
* and whether it needs to be indexed
*
* @param messages
* @return
*/
private List<IndexEventResult> callEventHandlers(final List<QueueMessage> messages) {
if (logger.isDebugEnabled()) {
logger.debug("callEventHandlers with {} message(s)", messages.size());
}
Stream<IndexEventResult> indexEventResults =
messages
.stream()
.map(
message -> {
if (logger.isDebugEnabled()) {
logger.debug(
"Queue message with ID {} has been received {} time(s)",
message.getMessageId(),
message.getReceiveCount());
}
AsyncEvent event = null;
try {
event = (AsyncEvent) message.getBody();
} catch (ClassCastException cce) {
logger.error("Failed to deserialize message body", cce);
return new IndexEventResult(
Optional.absent(), Optional.absent(), System.currentTimeMillis());
}
if (event == null) {
logger.error("AsyncEvent type or event is null!");
return new IndexEventResult(
Optional.absent(), Optional.absent(), System.currentTimeMillis());
}
final AsyncEvent thisEvent = event;
if (logger.isDebugEnabled()) {
logger.debug("Processing event with type {}", event.getClass().getSimpleName());
}
try {
IndexOperationMessage single = new IndexOperationMessage();
// normal indexing event for an entity
if (event instanceof EntityIndexEvent) {
single = handleEntityIndexUpdate(message);
}
// normal indexing event for an edge
else if (event instanceof EdgeIndexEvent) {
single = handleEdgeIndex(message);
}
// deletes are 2-part, actual IO to delete data, then queue up a de-index
else if (event instanceof EdgeDeleteEvent) {
single = handleEdgeDelete(message);
}
// deletes are 2-part, actual IO to delete data, then queue up a de-index
else if (event instanceof EntityDeleteEvent) {
single = handleEntityDelete(message);
}
// initialization has special logic, therefore a special event type and no index
// operation message
else if (event instanceof InitializeApplicationIndexEvent) {
handleInitializeApplicationIndex(event, message);
}
// this is the main event that pulls the index doc from map persistence and
// hands to the index producer
else if (event instanceof ElasticsearchIndexEvent) {
handleIndexOperation((ElasticsearchIndexEvent) event);
} else if (event instanceof DeIndexOldVersionsEvent) {
single = handleDeIndexOldVersionEvent((DeIndexOldVersionsEvent) event);
} else {
throw new Exception(
"Unknown EventType for message: " + message.getStringBody().trim());
}
if (!(event instanceof ElasticsearchIndexEvent)
&& !(event instanceof InitializeApplicationIndexEvent)
&& single.isEmpty()) {
logger.warn(
"No index operation messages came back from event processing for msg: {} ",
message.getStringBody().trim());
}
// if no exception happens and the QueueMessage is returned in these results, it
// will get ack'd
return new IndexEventResult(
Optional.of(single), Optional.of(message), thisEvent.getCreationTime());
} catch (IndexDocNotFoundException e) {
// this exception is throw when we wait before trying quorum read on map
// persistence.
// return empty event result so the event's message doesn't get ack'd
if (logger.isDebugEnabled()) {
logger.debug(e.getMessage());
}
return new IndexEventResult(
Optional.absent(), Optional.absent(), thisEvent.getCreationTime());
} catch (Exception e) {
// NPEs don't have a detail message, so add something for our log statement to
// identify better
final String errorMessage;
if (e instanceof NullPointerException) {
errorMessage = "NullPointerException";
} else {
errorMessage = e.getMessage();
}
// if the event fails to process, log and return empty message result so it
// doesn't get ack'd
logger.error(
"{}. Failed to process message: {}",
errorMessage,
message.getStringBody().trim());
return new IndexEventResult(
Optional.absent(), Optional.absent(), thisEvent.getCreationTime());
}
});
return indexEventResults.collect(Collectors.toList());
}