content: /*
   * 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.kafka.jmh.coordinator;
  
  import org.apache.kafka.common.Uuid;
  import org.apache.kafka.common.metadata.TopicRecord;
  import org.apache.kafka.common.utils.LogContext;
  import org.apache.kafka.common.utils.Time;
  import org.apache.kafka.coordinator.group.GroupMetadataManager;
  import org.apache.kafka.image.MetadataDelta;
  import org.apache.kafka.image.MetadataImage;
  import org.apache.kafka.image.MetadataProvenance;
  
  import org.openjdk.jmh.annotations.Benchmark;
  import org.openjdk.jmh.annotations.BenchmarkMode;
  import org.openjdk.jmh.annotations.Fork;
  import org.openjdk.jmh.annotations.Level;
  import org.openjdk.jmh.annotations.Measurement;
  import org.openjdk.jmh.annotations.Mode;
  import org.openjdk.jmh.annotations.OutputTimeUnit;
  import org.openjdk.jmh.annotations.Param;
  import org.openjdk.jmh.annotations.Scope;
  import org.openjdk.jmh.annotations.Setup;
  import org.openjdk.jmh.annotations.State;
  import org.openjdk.jmh.annotations.Threads;
  import org.openjdk.jmh.annotations.Warmup;
  import org.slf4j.Logger;
  
  import java.util.HashSet;
  import java.util.List;
  import java.util.Optional;
  import java.util.Random;
  import java.util.Set;
  import java.util.concurrent.TimeUnit;
  
  @State(Scope.Benchmark)
  @Fork(value = 1)
  @Warmup(iterations = 5)
  @Measurement(iterations = 5)
  @BenchmarkMode(Mode.AverageTime)
  @OutputTimeUnit(TimeUnit.MILLISECONDS)
  public class RegexResolutionBenchmark {
      private static final Logger LOG = new LogContext().logger(RegexResolutionBenchmark.class);
      private static final Time TIME = Time.SYSTEM;
      private static final String GROUP_ID = "my-group-id";
  
      private static final List<String> WORDS = List.of(
          "data",
          "stream",
          "queue",
          "analytics",
          "service",
          "event",
          "log",
          "cloud",
          "process",
          "system",
          "message",
          "broker",
          "partition",
          "key",
          "value",
          "cluster",
          "zookeeper",
          "replication",
          "topic",
          "producer"
      );
  
      @Param({"10000", "100000", "1000000"})
      private int topicCount;
  
      @Param({"1", "10", "100"})
      private int regexCount;
  
      private MetadataImage image;
  
      private Set<String> regexes;
  
      @Setup(Level.Trial)
      public void setup() {
          Random random = new Random();
  
          MetadataDelta delta = new MetadataDelta(MetadataImage.EMPTY);
          for (int i = 0; i < topicCount; i++) {
              String topicName =
                  WORDS.get(random.nextInt(WORDS.size())) + "_" +
                  WORDS.get(random.nextInt(WORDS.size())) + "_" +
                  i;
  
              delta.replay(new TopicRecord()
                  .setTopicId(Uuid.randomUuid())
                  .setName(topicName));
          }
          image = delta.apply(MetadataProvenance.EMPTY);
  
          regexes = new HashSet<>();
          for (int i = 0; i < regexCount; i++) {
              regexes.add(".*" + WORDS.get(random.nextInt(WORDS.size())) + ".*");
          }
      }
  
      @Benchmark
      @Threads(1)
      @OutputTimeUnit(TimeUnit.MILLISECONDS)
      public void run() {
          GroupMetadataManager.refreshRegularExpressions(
              null,
              GROUP_ID,
              LOG,
              TIME,
              image,
              Optional.empty(),
              regexes
          );
      }
  }
  