private Map<String, ZonedDateTime> findTimestamps(ElasticsearchMessage message) {
final TypeConstraint<ZonedDateTime> timestampConstraint =
TypeConstraint.ofClass(ZonedDateTime.class);
return message
.toMap()
.entrySet()
.stream()
.filter(entry -> timestampConstraint.canCast(entry.getValue()))
.collect(
Collectors.<Map.Entry<String, Object>, String, ZonedDateTime>toMap(
entry -> entry.getKey(), entry -> timestampConstraint.cast(entry.getValue())));
}
@Override
public void accept(ElasticsearchMessage message) {
try {
List<ElasticsearchIndex> indices = message.getIndices();
if (indices.isEmpty()) {
if (LOGGER.isTraceEnabled()) {
LOGGER.trace(
String.format(
"No index found for message %s. Storing under default index %s",
message, defaultIndex.toString()));
}
storeMessageToIndex(message, defaultIndex);
} else {
indices.stream().forEach(index -> storeMessageToIndex(message, index));
}
} catch (ConcurrentModificationException e) {
LOGGER.error("Error storing message", e);
}
}
/**
* Adds an index request to store a single message to a single index.
*
* @param message The message to index.
* @param index The index of the message.
* @param metrics The metrics to record the storage in.
*/
private void storeMessageToIndex(ElasticsearchMessage message, ElasticsearchIndex index) {
/*
* Implementation note: Elasticsearch is not happy about the ZonedDateTime toString format, so we need to format
* the timestamp using a time zone offset instead.
*/
Map<String, Object> sourceMap = message.toMap();
Map<String, String> formattedTimestamps = formatTimestamps(findTimestamps(message));
if (!formattedTimestamps.containsKey(ElasticsearchMessage.DEFAULT_TIMESTAMP_FIELD)) {
formattedTimestamps.put(
ElasticsearchMessage.DEFAULT_TIMESTAMP_FIELD, formatTimestamp(ZonedDateTime.now()));
}
sourceMap.putAll(formattedTimestamps);
IndexRequest request = new IndexRequest(index.toString(), documentType).source(sourceMap);
processor.add(request);
if (LOGGER.isTraceEnabled()) {
LOGGER.trace(String.format("Added message to %s with data: %s", index, sourceMap));
}
}