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/*******************************************************************************
* ============LICENSE_START=======================================================
* slice-analysis-ms
* ================================================================================
* Copyright (C) 2022 Wipro Limited.
* ==============================================================================
* 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.
* ============LICENSE_END=========================================================
*
*******************************************************************************/
package org.onap.slice.analysis.ms.service;
import com.fasterxml.jackson.databind.ObjectMapper;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.TimeZone;
import org.json.JSONArray;
import org.json.JSONObject;
import org.onap.slice.analysis.ms.aai.AaiService;
import org.onap.slice.analysis.ms.exception.DesClientException;
import org.onap.slice.analysis.ms.models.AggregatedConfig;
import org.onap.slice.analysis.ms.models.Configuration;
import org.onap.slice.analysis.ms.models.SliceConfigDetails;
import org.onap.slice.analysis.ms.models.SliceConfigRequest;
import org.onap.slice.analysis.ms.models.SliceConfigResponse;
import org.onap.slice.analysis.ms.restclients.DesRestClient;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.ParameterizedTypeReference;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Service;
/**
* This Service calculates the slice utilization details
*/
@Service
public class SliceUtilization {
private static Logger log = LoggerFactory.getLogger(SliceUtilization.class);
@Autowired
private AaiService aaiService;
@Autowired
DesRestClient desRestClient;
/**
* Default values set for uplink and downlink throughput calculation (in
* accordance with 3GPP specifications)
*
*/
private static final Integer numOfAggregatedComponentCarries = 8;
private static final Integer maxNumOfLayers = 4;
private static final Integer maxModulationOrder = 2;
private static final Integer scalingFactor = 1;
private static final Double maxBitRate = 948.0 / 1024;
private static final Integer nrNumerology = 2;
private static final Double averageSymbolDuration = Math.pow(10, -3) / (14 * 2 * nrNumerology);
private static final Double overHeadForDl = 0.18;
private static final Double overHeadForUl = 0.10;
private static final Integer TOTAL_PRB = 132;
/**
* Calculates the slice utilization details for requested slices.
*
* @param sliceConfigRequest contains sliceInstanceId
* @return SliceConfigResponse contains slice utilization details
*/
public SliceConfigResponse getSliceUtilizationData(SliceConfigRequest sliceConfigRequest) {
log.info("getSliceUtilizationData");
SliceConfigResponse sliceConfigResponse = new SliceConfigResponse();
ArrayList<SliceConfigDetails> sliceConfigDetailsList = new ArrayList<>();
try {
sliceConfigRequest.getSliceIdentifiers().forEach(sliceInstanceId -> {
List<String> snssaiList = null;
snssaiList = aaiService.getSnssaiList(sliceInstanceId);
List<JSONObject> pmDataList = new ArrayList<>();
snssaiList.forEach(snssai -> {
JSONObject pmData = getPMData(snssai);
pmDataList.add(pmData);
});
AggregatedConfig aggregatedConfig = calculateSliceUtilization(pmDataList);
SliceConfigDetails sliceConfigDetails = new SliceConfigDetails();
sliceConfigDetails.setSliceIdentifiers(sliceInstanceId);
sliceConfigDetails.setAggregatedConfig(aggregatedConfig);
sliceConfigDetailsList.add(sliceConfigDetails);
});
} catch (Exception e) {
log.error("Exception caught while fetching data");
}
sliceConfigResponse.setSliceConfigDetails(sliceConfigDetailsList);
log.info("SliceConfigResponse: " + sliceConfigResponse.toString());
return sliceConfigResponse;
}
/**
* Fetches the PM data for requested SNSSAI from DES.
*
* @param snssai snssai ID
* @return PM Data for requested SNSSAI
*/
protected JSONObject getPMData(String snssai) {
String desUrl = Configuration.getInstance().getDesUrl();
Map<String, String> inputParameter = new HashMap<>();
int duration = Configuration.getInstance().getPmDataDurationInWeeks();
Calendar calendar = Calendar.getInstance(TimeZone.getTimeZone("GMT"));
calendar.add(Calendar.WEEK_OF_MONTH, -duration);
inputParameter.put("snssai", "SM.PrbUsedDl." + snssai);
inputParameter.put("time", String.valueOf(calendar.getTimeInMillis()));
ResponseEntity<String> response = null;
JSONObject pmData = null;
try {
String jsonRequestBody = new ObjectMapper().writeValueAsString(inputParameter);
log.info("fetching PM Data for : {}", snssai);
log.info("desUrl {}", desUrl);
log.info("jsonRequestBody {}", jsonRequestBody);
response =
desRestClient.sendPostRequest(desUrl, jsonRequestBody, new ParameterizedTypeReference<String>() {});
pmData = new JSONObject(response.getBody());
if (response.getStatusCode().value() != 200) {
throw new DesClientException(String.format("Response code from DES other than 200: %d\", statusCode",
response.getStatusCode().value()));
}
} catch (Exception e) {
log.error("Error while fetching PM data from DES {} ", e);
}
return pmData;
}
/**
* Calculates average DL and UL PRB used from the PM data and returns the
* remaining resources(utilization details) in terms of throughput
*
* @param pmDataList PM data for all SNSSAIs
* @return aggregatedConfig containing slice utilization details
*/
protected AggregatedConfig calculateSliceUtilization(List<JSONObject> pmDataList) {
Integer numOfPRBData = 0;
Integer dlPRBUsed = 0;
Integer ulPRBUsed = 0;
Integer dlThptIndex = 0;
Integer ulThptIndex = 1;
try {
for (JSONObject pmData : pmDataList) {
JSONArray result = pmData.getJSONArray("result");
for (int i = 0; i < result.length(); i++) {
JSONObject measValuesObject = result.getJSONObject(i);
String measValuesListStr = measValuesObject.getString("measValuesList");
String sMeasTypesListtStr = measValuesObject.getString("sMeasTypesList");
JSONArray measValuesArray = new JSONArray(measValuesListStr);
JSONArray sMeasTypesArray = new JSONArray(sMeasTypesListtStr);
if (sMeasTypesArray.getString(0).contains("PrbUsedUl")) {
ulThptIndex = 0;
dlThptIndex = 1;
}
numOfPRBData += measValuesArray.length();
for (int j = 0; j < measValuesArray.length(); j++) {
dlPRBUsed +=
measValuesArray.getJSONArray(j).getJSONArray(1).getJSONArray(dlThptIndex).getInt(1);
ulPRBUsed +=
measValuesArray.getJSONArray(j).getJSONArray(1).getJSONArray(ulThptIndex).getInt(1);
}
}
}
} catch (Exception e) {
log.error("Exception caught while calculating slice utilization: {}", e);
}
Integer averageDLPrb = dlPRBUsed / numOfPRBData;
Integer averageULPrb = ulPRBUsed / numOfPRBData;
Double tempdl = 0.0;
Double tempul = 0.0;
int j = 1;
while (j <= numOfAggregatedComponentCarries) {
tempdl += ((Math.pow(maxNumOfLayers, j) * Math.pow(maxModulationOrder, j) * Math.pow(scalingFactor, j)
* maxBitRate * (TOTAL_PRB - averageDLPrb) * 12 * (1 - Math.pow(overHeadForDl, j)))
/ averageSymbolDuration) * Math.pow(10, -6);
tempul += ((Math.pow(maxNumOfLayers, j) * Math.pow(maxModulationOrder, j) * Math.pow(scalingFactor, j)
* maxBitRate * (TOTAL_PRB - averageULPrb) * 12 * (1 - Math.pow(overHeadForUl, j)))
/ averageSymbolDuration) * Math.pow(10, -6);
j++;
}
Integer dLThptPerSliceInMbps = (int) Math.round(tempdl);
Integer uLThptPerSliceInMbps = (int) Math.round(tempul);
AggregatedConfig aggregatedConfig = new AggregatedConfig();
aggregatedConfig.setDLThptPerSlice(dLThptPerSliceInMbps);
aggregatedConfig.setULThptPerSlice(uLThptPerSliceInMbps);
return aggregatedConfig;
}
}
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