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/*
* Copyright (C) 2021 Samsung Electronics
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* http://www.apache.org/licenses/LICENSE-2.0
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License
*/
package org.onap.rapp.datacollector.service;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.OptionalDouble;
import java.util.stream.Collectors;
import org.onap.rapp.datacollector.entity.DataAggregationInfo;
import org.onap.rapp.datacollector.entity.pm.PMData;
import org.onap.rapp.datacollector.entity.pm.PerformanceData;
import org.onap.rapp.datacollector.entity.ves.AdditionalMeasurements;
import org.onap.rapp.datacollector.entity.ves.Event;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Service;
@Service
public class DataAggregationService {
private final Logger logger = LoggerFactory.getLogger(this.getClass());
private static final String LATENCY_FIELD_NAME = "latency";
private static final String THROUGHPUT_FIELD_NAME = "throughput";
public static final int MEASUREMENT_INDEX = 0;
public PMData getAggregatedDataFromEventsForCell(String cellId, List<Event> events, DataAggregationInfo dataAggregationInfo) {
logger.info("Cell {}, events size {}", cellId, events.size());
Collection<List<Event>> eventsByTime = groupEventsTimeSlots(events, dataAggregationInfo);
List<PerformanceData> pmDataList = new ArrayList<>();
eventsByTime.forEach(slotOfEvents -> {
List<Integer> latencyList = getPerformanceData(slotOfEvents, LATENCY_FIELD_NAME);
List<Integer> throughputList = getPerformanceData(slotOfEvents, THROUGHPUT_FIELD_NAME);
Integer latencyAggregatedData = getAverage(latencyList);
Integer throughputAggregatedData = getAverage(throughputList);
PerformanceData pm = new PerformanceData(latencyAggregatedData, throughputAggregatedData);
pmDataList.add(pm);
});
return new PMData(cellId, pmDataList);
}
private Collection<List<Event>> groupEventsTimeSlots(List<Event> events, DataAggregationInfo aggregationInfo) {
long slotStartTime = aggregationInfo.getStartTime();
long slotEndTime = slotStartTime + aggregationInfo.getSlot();
List<List<Event>> eventsByTime = new ArrayList<>();
List<Event> eventsOfSlot = new ArrayList<>();
for (Event event : events) {
if (isInNextSlot(slotEndTime, event)) {
eventsByTime.add(eventsOfSlot);
eventsOfSlot = new ArrayList<>();
slotStartTime = slotEndTime;
slotEndTime = slotStartTime + aggregationInfo.getSlot();
while (isInNextSlot(slotEndTime, event)){
eventsByTime.add(Collections.emptyList());
slotStartTime = slotEndTime;
slotEndTime = slotStartTime + aggregationInfo.getSlot();
}
}
eventsOfSlot.add(event);
}
eventsByTime.add(eventsOfSlot);
fillEmptyEndIfNeeded(aggregationInfo, slotEndTime, eventsByTime);
return eventsByTime;
}
private boolean isInNextSlot(long slotEndTime, Event event) {
return event.getCommonEventHeader().getLastEpochMicrosec() > slotEndTime;
}
private void fillEmptyEndIfNeeded(DataAggregationInfo aggregationInfo, long slotEndTime, List<List<Event>> eventsByTime) {
while (slotEndTime < aggregationInfo.getEndTime()){
eventsByTime.add(Collections.emptyList());
slotEndTime = slotEndTime + aggregationInfo.getSlot();
}
}
private List<Integer> getPerformanceData(List<Event> events, String measurement) {
return events.stream().map(e -> getPerformanceDataFromEvent(e, measurement))
.collect(Collectors.toList());
}
private int getPerformanceDataFromEvent(Event event, String name) {
AdditionalMeasurements performance = event.getMeasurementFields().getAdditionalMeasurements()
.stream().filter(am -> am.getName().equals(name)).findAny().orElseThrow();
return Integer.parseInt(performance.getValues().get(MEASUREMENT_INDEX).getParameterValue());
}
private Integer getAverage(List<Integer> values) {
if (values.isEmpty()) {
return null;
}
OptionalDouble average = values.stream().mapToDouble(l -> l).average();
if (average.isPresent()) {
return (int) average.getAsDouble();
} else {
return null;
}
}
}
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