private Number getStatisticalValue(FieldStatsResult fieldStatsResult) {
switch (statsFunction) {
case "count":
return fieldStatsResult.getCount();
case "mean":
return fieldStatsResult.getMean();
case "stddev":
return fieldStatsResult.getStdDeviation();
case "min":
return fieldStatsResult.getMin();
case "max":
return fieldStatsResult.getMax();
case "sum":
return fieldStatsResult.getSum();
case "variance":
return fieldStatsResult.getVariance();
case "squares":
return fieldStatsResult.getSumOfSquares();
case "cardinality":
return fieldStatsResult.getCardinality();
default:
throw new IllegalArgumentException(
"Statistic function " + statsFunction + " is not supported");
}
}
@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);
}
}
protected FieldStatsResult getFieldStatsResult(
FieldValueAlertCondition.CheckType type, Number retValue) {
final Double value = (Double) retValue;
final FieldStatsResult fieldStatsResult = mock(FieldStatsResult.class);
when(fieldStatsResult.getCount()).thenReturn(1L);
switch (type) {
case MIN:
when(fieldStatsResult.getMin()).thenReturn(value);
case MAX:
when(fieldStatsResult.getMax()).thenReturn(value);
case MEAN:
when(fieldStatsResult.getMean()).thenReturn(value);
case STDDEV:
when(fieldStatsResult.getStdDeviation()).thenReturn(value);
case SUM:
when(fieldStatsResult.getSum()).thenReturn(value);
}
return fieldStatsResult;
}
