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 org.apache.skywalking.oap.server.core.query.type.EBPFProfilingTree;
  
  import java.util.Collections;
  import java.util.EnumSet;
  import java.util.Set;
  import java.util.function.BiConsumer;
  import java.util.function.BinaryOperator;
  import java.util.function.Function;
  import java.util.function.Supplier;
  import java.util.stream.Collector;
  
  /**
   * Work for {@link EBPFProfilingAnalyzer} to analyze.
   */
  public class EBPFProfilingAnalyzeCollector implements Collector<EBPFProfilingStack, EBPFProfilingStackNode, EBPFProfilingTree> {
      @Override
      public Supplier<EBPFProfilingStackNode> supplier() {
          return EBPFProfilingStackNode::newNode;
      }
  
      @Override
      public BiConsumer<EBPFProfilingStackNode, EBPFProfilingStack> accumulator() {
          return EBPFProfilingStackNode::accumulateFrom;
      }
  
      @Override
      public BinaryOperator<EBPFProfilingStackNode> combiner() {
          return EBPFProfilingStackNode::combine;
      }
  
      @Override
      public Function<EBPFProfilingStackNode, EBPFProfilingTree> finisher() {
          return EBPFProfilingStackNode::buildAnalyzeResult;
      }
  
      @Override
      public Set<Characteristics> characteristics() {
          return Collections.unmodifiableSet(EnumSet.of(Characteristics.CONCURRENT, Characteristics.UNORDERED));
      }
  }