code: /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You 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.apache.skywalking.oap.server.core.profiling.ebpf.analyze;
  
  import lombok.AllArgsConstructor;
  import lombok.Data;
  import lombok.EqualsAndHashCode;
  import org.apache.skywalking.apm.network.ebpf.profiling.v3.EBPFOffCPUProfiling;
  import org.apache.skywalking.apm.network.ebpf.profiling.v3.EBPFOnCPUProfiling;
  import org.apache.skywalking.apm.network.ebpf.profiling.v3.EBPFProfilingStackMetadata;
  import org.apache.skywalking.oap.server.core.profiling.ebpf.storage.EBPFProfilingDataRecord;
  import org.apache.skywalking.oap.server.core.profiling.ebpf.storage.EBPFProfilingStackType;
  import org.apache.skywalking.oap.server.core.profiling.ebpf.storage.EBPFProfilingTargetType;
  import org.apache.skywalking.oap.server.core.query.type.EBPFProfilingAnalyzeAggregateType;
  
  import java.util.LinkedList;
  import java.util.List;
  
  /**
   * Transform the {@link EBPFProfilingDataRecord} as runtime data
   */
  @Data
  public class EBPFProfilingStack {
  
      private long uploadTime;
      private long dumpCount;
      private List<Symbol> symbols;
  
      public static EBPFProfilingStack deserialize(EBPFProfilingDataRecord record,
                                                   EBPFProfilingAnalyzeAggregateType aggregateType) throws Exception {
          final EBPFProfilingStack stack = new EBPFProfilingStack();
          analyzeSymbolAndDimension(record, aggregateType, stack);
          stack.setUploadTime(record.getUploadTime());
          return stack;
      }
  
      @Data
      @AllArgsConstructor
      @EqualsAndHashCode
      public static final class Symbol {
          private String name;
          private EBPFProfilingStackType stackType;
      }
  
      private static void analyzeSymbolAndDimension(EBPFProfilingDataRecord record,
                                         EBPFProfilingAnalyzeAggregateType aggregateType,
                                         EBPFProfilingStack toStack) throws Exception {
          final EBPFProfilingTargetType targetType = EBPFProfilingTargetType.valueOf(record.getTargetType());
          switch (targetType) {
              case ON_CPU:
                  final EBPFOnCPUProfiling onCPUProfiling = EBPFOnCPUProfiling.parseFrom(record.getDataBinary());
                  toStack.setDumpCount(onCPUProfiling.getDumpCount());
                  toStack.setSymbols(parseSymbols(onCPUProfiling.getStacksList()));
                  break;
              case OFF_CPU:
                  final EBPFOffCPUProfiling offCPUProfiling = EBPFOffCPUProfiling.parseFrom(record.getDataBinary());
                  toStack.setSymbols(parseSymbols(offCPUProfiling.getStacksList()));
                  if (aggregateType == EBPFProfilingAnalyzeAggregateType.DURATION) {
                      toStack.setDumpCount(offCPUProfiling.getDuration());
                  } else {
                      toStack.setDumpCount(offCPUProfiling.getSwitchCount());
                  }
                  break;
              default:
                  throw new Exception("unknown target type: " + targetType);
          }
      }
  
      private static List<Symbol> parseSymbols(List<EBPFProfilingStackMetadata> metadataList) {
          final LinkedList<Symbol> symbols = new LinkedList<>();
          for (EBPFProfilingStackMetadata stack : metadataList) {
              stack.getStackSymbolsList()
                      .forEach(s -> symbols.addFirst(new Symbol(
                              s,
                              EBPFProfilingStackType.valueOf(stack.getStackType())
                      )));
          }
          return symbols;
      }
  }