@Override
protected ComputationResult compute() {
try {
final String filter;
if (!isNullOrEmpty(streamId)) {
filter = "streams:" + streamId;
} else {
filter = null;
}
// if we only need the cardinality, we can skip calculating the extended stats and vice versa
boolean isCardinalityFunction = "cardinality".equals(statsFunction);
final FieldStatsResult fieldStatsResult =
getSearches()
.fieldStats(
field, query, filter, timeRange, isCardinalityFunction, isCardinalityFunction);
if (trend && timeRange instanceof RelativeRange) {
DateTime toPrevious = timeRange.getFrom();
DateTime fromPrevious =
toPrevious.minus(Seconds.seconds(((RelativeRange) timeRange).getRange()));
TimeRange previousTimeRange = new AbsoluteRange(fromPrevious, toPrevious);
final FieldStatsResult previousFieldStatsResult =
getSearches()
.fieldStats(
field,
query,
filter,
previousTimeRange,
isCardinalityFunction,
isCardinalityFunction);
Map<String, Object> results = Maps.newHashMap();
results.put("now", getStatisticalValue(fieldStatsResult));
results.put("previous", getStatisticalValue(previousFieldStatsResult));
long tookMs = fieldStatsResult.took().millis() + previousFieldStatsResult.took().millis();
return new ComputationResult(results, tookMs);
} else {
return new ComputationResult(
getStatisticalValue(fieldStatsResult), fieldStatsResult.took().millis());
}
} catch (Searches.FieldTypeException e) {
throw new RuntimeException("Invalid field provided.", e);
}
}
