[dcaegen2/services.git] /

/*******************************************************************************
 *  ============LICENSE_START=======================================================
 *  slice-analysis-ms
 *  ================================================================================
 *   Copyright (C) 2020 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 java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import javax.annotation.PostConstruct;

import org.onap.slice.analysis.ms.configdb.IConfigDbService;
import org.onap.slice.analysis.ms.models.Configuration;
import org.onap.slice.analysis.ms.models.MeasurementObject;
import org.onap.slice.analysis.ms.models.SubCounter;
import org.onap.slice.analysis.ms.models.policy.AdditionalProperties;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Component;

/** 
 * This class process the measurement data of an S-NSSAI
 */
@Component
@Scope("prototype")
public class SnssaiSamplesProcessor {
        private static Logger log = LoggerFactory.getLogger(SnssaiSamplesProcessor.class);

        @Autowired
        private PolicyService policyService;
        
        @Autowired
        private IConfigDbService configDbService;
        
        @Autowired
        private PmDataQueue pmDataQueue;
        
        @Autowired
        private AverageCalculator averageCalculator;
        
        private List<MeasurementObject> snssaiMeasurementList = new ArrayList<>();
        private Map<String, List<String>> ricToCellMapping = new HashMap<>();
        private Map<String, Map<String, Integer>> ricToPrbsMapping = new HashMap<>();
        private Map<String, Map<String, Integer>> ricToThroughputMapping = new HashMap<>();
        private int samples;
        private List<String> pmsToCompute;      
        private Map<String, String> prbThroughputMapping = new HashMap<>(); 
        private int minPercentageChange;
        
        @PostConstruct
        public void init() {
                Configuration configuration = Configuration.getInstance();
                samples = configuration.getSamples();
                pmsToCompute = new ArrayList<>();
                pmsToCompute.add("PrbUsedDl");
                pmsToCompute.add("PrbUsedUl");
                prbThroughputMapping = new HashMap<>();
                prbThroughputMapping.put("PrbUsedDl", "dLThptPerSlice");
                prbThroughputMapping.put("PrbUsedUl", "uLThptPerSlice");
                minPercentageChange = configuration.getMinPercentageChange();
        }

        /**
         * process the measurement data of an S-NSSAI
         */
        public void processSamplesOfSnnsai(String snssai, List<String> networkFunctions) {
                networkFunctions.forEach(nf -> {
                        log.debug("Average of samples for {}:", snssai);
                        addToMeasurementList(averageCalculator.findAverageOfSamples(pmDataQueue.getSamplesFromQueue(new SubCounter(nf, snssai), samples)));
                });             
                ricToCellMapping = configDbService.fetchRICsOfSnssai(snssai);   
                log.debug("RIC to Cell Mapping for {} S-NSSAI: {}", snssai, ricToCellMapping);
                Map<String, Map<String, Integer>> ricConfiguration = configDbService.fetchCurrentConfigurationOfRIC(snssai);
                Map<String, Integer> sliceConfiguration = configDbService.fetchCurrentConfigurationOfSlice(snssai);
                log.debug("RIC Configuration: {}", ricConfiguration);
                log.debug("Slice Configuration: {}", sliceConfiguration);
                pmsToCompute.forEach(pm -> {
                        sumOfPrbsAcrossCells(pm);
                        int sum = computeSum(pm);
                        computeThroughput(sliceConfiguration, sum, pm);
                        calculatePercentageChange(ricConfiguration, pm);
                });
                updateConfiguration();  
                if(ricToThroughputMapping.size() > 0) {
                        AdditionalProperties<Map<String, Map<String, Integer>>> addProps = new AdditionalProperties<>();
                        addProps.setResourceConfig(ricToThroughputMapping);
                        policyService.sendOnsetMessageToPolicy(snssai, addProps, configDbService.fetchServiceDetails(snssai));
                }

        }

        /**
         * process the measurement data of an S-NSSAI
         */
        protected void updateConfiguration() {
                Iterator<Map.Entry<String, Map<String,Integer>>> it = ricToThroughputMapping.entrySet().iterator();
                Map.Entry<String, Map<String,Integer>> entry = null;
                while(it.hasNext()) {
                        entry = it.next();
                        if(entry.getValue().size() == 0) {
                                it.remove();
                        }
                }
        }

        private void addToMeasurementList(List<MeasurementObject> sample) {
                snssaiMeasurementList.addAll(sample);
        }

        /**
         * Calculate the change in the configuration value and keep the configuration only if it is greater than a
         * specific limit 
         */
        protected void calculatePercentageChange(Map<String, Map<String, Integer>> ricConfiguration, String pm) {
                Iterator<Map.Entry<String, Map<String,Integer>>> it = ricToThroughputMapping.entrySet().iterator();
                Map.Entry<String, Map<String,Integer>> entry = null;
                float existing = 0;
                float change = 0;
                while(it.hasNext()) {
                        entry = it.next();
                        existing = ricConfiguration.get(entry.getKey()).get(pm);
                        change = ((Math.abs(entry.getValue().get(pm) - existing))/existing)*100;
                        if (change <= minPercentageChange) {
                                ricToThroughputMapping.get(entry.getKey()).remove(pm);
                        }
                }
        }
        
        protected void sumOfPrbsAcrossCells(String pmName) {
                ricToCellMapping.forEach((ric,cells) -> {
                        int sumOfPrbs = 0;
                        for(String cell : cells) {
                                int index = snssaiMeasurementList.indexOf(new MeasurementObject(cell));
                                sumOfPrbs += snssaiMeasurementList.get(index).getPmData().get(pmName);
                        }
                        if(ricToPrbsMapping.containsKey(ric)) {
                                ricToPrbsMapping.get(ric).put(pmName, sumOfPrbs);
                        }
                        else {
                                Map<String, Integer> pmToPrbMapping  = new HashMap<>();
                                pmToPrbMapping.put(pmName, sumOfPrbs);
                                ricToPrbsMapping.put(ric, pmToPrbMapping);
                        }
                });
        }

        protected Integer computeSum(String pm) {
                return ricToPrbsMapping.entrySet().stream().map(x -> x.getValue().get(pm)).reduce(0, Integer::sum);
        }

        protected void computeThroughput(Map<String, Integer> sliceConfiguration, int sum, String pm) {
                Iterator<Map.Entry<String, Map<String,Integer>>> it = ricToPrbsMapping.entrySet().iterator();
                Map.Entry<String, Map<String,Integer>> entry = null;
                Map<String, Integer> throughtputMap = null;
                String ric = "";
                int value = 0;
                while(it.hasNext()) {
                        entry = it.next();
                        ric = entry.getKey();
                        value = Math.round(((float)entry.getValue().get(pm)/sum)*(float)sliceConfiguration.get(prbThroughputMapping.get(pm)));
                        if(ricToThroughputMapping.containsKey(ric)) {
                                ricToThroughputMapping.get(ric).put(prbThroughputMapping.get(pm), value);
                        }
                        else {
                                throughtputMap = new HashMap<>();
                                throughtputMap.put(prbThroughputMapping.get(pm), value);
                                ricToThroughputMapping.put(ric, throughtputMap);
                        }
                }

        }

}