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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.a1pesimulator.util;
import java.text.MessageFormat;
import java.time.Instant;
import java.time.temporal.ChronoUnit;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Random;
import java.util.function.UnaryOperator;
import java.util.stream.Collectors;
import org.onap.a1pesimulator.data.Event;
import org.onap.a1pesimulator.data.ue.UserEquipment;
import org.onap.a1pesimulator.data.ves.CommonEventHeader;
import org.onap.a1pesimulator.data.ves.MeasurementFields.AdditionalMeasurement;
import org.onap.a1pesimulator.service.ue.RanUeHolder;
public class RanVesUtils {
private static final String PATTERN_DIGIT = "\\d+";
private static final String PATTERN_SPLIT_RANDOM = "-";
private static final String PATTERN_SPLIT_TRENDING = "->";
private static final String MARKER_START = "[[";
private static final String MARKER_END = "]]";
private static final String PATTERN_MARKER_START = "\\[\\[";
private static final String PATTERN_MARKER_END = "\\]\\]";
public static final String UE_PARAM_TRAFFIC_MODEL = "trafficModel";
private static final int TEN_MINUTES_MICROSECONDS = 10 * 60 * 1000_000;
private static final Random random = new Random();
private RanVesUtils() {
}
public static void updateHeader(Event event) {
CommonEventHeader commonEventHeader = event.getCommonEventHeader();
commonEventHeader.setLastEpochMicrosec(ChronoUnit.MICROS.between(Instant.EPOCH, Instant.now()));
commonEventHeader.setStartEpochMicrosec(getStartEpochMicroseconds());
}
public static AdditionalMeasurement buildTrafficModelMeasurement(AdditionalMeasurement identityMeasurement,
RanUeHolder ranUeHolder, String valuePattern) {
String cellId = identityMeasurement.getHashMap().get(Constants.MEASUREMENT_FIELD_VALUE);
AdditionalMeasurement trafficModel = new AdditionalMeasurement();
Map<String, String> hashMap = new HashMap<>();
trafficModel.setName(UE_PARAM_TRAFFIC_MODEL);
trafficModel.setHashMap(hashMap);
Collection<UserEquipment> cellUes = ranUeHolder.getUserEquipmentsConnectedToCell(cellId);
cellUes.stream().map(UserEquipment::getId).forEach(ueId -> hashMap.put(ueId, valuePattern));
return trafficModel;
}
public static List<AdditionalMeasurement> randomizeAdditionalMeasurements(
Collection<AdditionalMeasurement> toRandomize) {
return toRandomize.stream().map(measurement -> transformAdditionalMeasurementValues(measurement,
RanVesUtils::randomizeValue)).collect(Collectors.toList());
}
public static List<AdditionalMeasurement> setLowRangeValues(List<AdditionalMeasurement> toUpdateMeasurements) {
return toUpdateMeasurements.stream().map(measurement -> transformAdditionalMeasurementValues(measurement,
RanVesUtils::getLowRangeValue)).collect(Collectors.toList());
}
private static AdditionalMeasurement transformAdditionalMeasurementValues(AdditionalMeasurement measurement,
UnaryOperator<String> transformAction) {
AdditionalMeasurement randomizedMeasurement = new AdditionalMeasurement();
randomizedMeasurement.setName(measurement.getName());
randomizedMeasurement.setHashMap(transformValues(measurement.getHashMap(), transformAction));
return randomizedMeasurement;
}
private static Map<String, String> transformValues(Map<String, String> values,
UnaryOperator<String> transformAction) {
Map<String, String> randomizedMap = new HashMap<>(values.size());
values.forEach((key, value) -> randomizedMap.put(key, transformAction.apply(value)));
return randomizedMap;
}
private static String randomizeValue(String value) {
if (!isRange(value)) {
return value;
}
String toRandomize = value.substring(MARKER_START.length(), value.length() - MARKER_END.length());
String[] ranges = toRandomize.split(PATTERN_SPLIT_RANDOM);
int randomNumber = getRandomNumber(parseInt(ranges[0]), parseInt(ranges[1]));
return String.valueOf(randomNumber);
}
private static String getLowRangeValue(String value) {
if (!isRange(value)) {
return value;
}
String toRandomize = value.substring(MARKER_START.length(), value.length() - MARKER_END.length());
String[] ranges = toRandomize.split(PATTERN_SPLIT_RANDOM);
return String.valueOf(ranges[0]);
}
private static Long getStartEpochMicroseconds() {
long epochMicrosecondsNow = ChronoUnit.MICROS.between(Instant.EPOCH, Instant.now());
long lowest10minInterval = epochMicrosecondsNow - epochMicrosecondsNow % TEN_MINUTES_MICROSECONDS;
long highest10minInterval = lowest10minInterval + TEN_MINUTES_MICROSECONDS;
if ((epochMicrosecondsNow - lowest10minInterval) < (highest10minInterval - epochMicrosecondsNow)) {
return lowest10minInterval;
} else {
return highest10minInterval;
}
}
public static int getRandomNumber(int min, int max) {
return random.nextInt(max - min) + min;
}
private static int parseInt(String strNum) {
try {
return Integer.parseInt(strNum);
} catch (NumberFormatException nfe) {
throw new IllegalArgumentException(MessageFormat.format("Cannot parse int for value: {0}", strNum), nfe);
}
}
public static boolean isRange(String value) {
return value.startsWith(MARKER_START) && value.endsWith(MARKER_END);
}
private static boolean isRange(String value, String splitPattern) {
String pattern = PATTERN_MARKER_START + PATTERN_DIGIT + splitPattern + PATTERN_DIGIT + PATTERN_MARKER_END;
return value.matches(pattern);
}
public static boolean isRandomRange(String value) {
return isRange(value, PATTERN_SPLIT_RANDOM);
}
public static boolean isTrandingRange(String value) {
return isRange(value, PATTERN_SPLIT_TRENDING);
}
public static String[] splitRandomRange(String value) {
return splitRange(value, PATTERN_SPLIT_RANDOM);
}
public static String[] splitTrendingRange(String value) {
return splitRange(value, PATTERN_SPLIT_TRENDING);
}
private static String[] splitRange(String value, String splitPattern) {
String truncated = value.substring(MARKER_START.length(), value.length() - MARKER_END.length());
return truncated.split(splitPattern);
}
}
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