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.generator;
  
  import java.util.Random;
  import java.util.concurrent.ThreadLocalRandom;
  import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
  import lombok.Data;
  
  @JsonDeserialize(builder = BoolGenerator.Builder.class)
  public final class BoolGenerator implements Generator<Boolean> {
      private final Random random = ThreadLocalRandom.current();
      private final double possibility;
  
      public BoolGenerator(Builder builder) {
          possibility = builder.possibility;
      }
  
      @Override
      public Boolean next() {
          return random.nextDouble() < possibility;
      }
  
      @Override
      public String toString() {
          return String.valueOf(next());
      }
  
      @Data
      public static class Builder {
          private double possibility = .5;
  
          public BoolGenerator build() {
              return new BoolGenerator(this);
          }
      }
  }
  