code: /*
   * Copyright (c) 2016-present, RxJava Contributors.
   *
   * 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.
   */
  
  package io.reactivex.rxjava3.internal.schedulers;
  
  import io.reactivex.rxjava3.annotations.NonNull;
  
  import java.util.concurrent.ThreadFactory;
  import java.util.concurrent.atomic.AtomicLong;
  
  /**
   * A ThreadFactory that counts how many threads have been created and given a prefix,
   * sets the created Thread's name to {@code prefix-count}.
   */
  public final class RxThreadFactory extends AtomicLong implements ThreadFactory {
  
      private static final long serialVersionUID = -7789753024099756196L;
  
      final String prefix;
  
      final int priority;
  
      final boolean nonBlocking;
  
  //    static volatile boolean CREATE_TRACE;
  
      public RxThreadFactory(String prefix) {
          this(prefix, Thread.NORM_PRIORITY, false);
      }
  
      public RxThreadFactory(String prefix, int priority) {
          this(prefix, priority, false);
      }
  
      public RxThreadFactory(String prefix, int priority, boolean nonBlocking) {
          this.prefix = prefix;
          this.priority = priority;
          this.nonBlocking = nonBlocking;
      }
  
      @Override
      public Thread newThread(@NonNull Runnable r) {
          StringBuilder nameBuilder = new StringBuilder(prefix).append('-').append(incrementAndGet());
  
  //        if (CREATE_TRACE) {
  //            nameBuilder.append("\r\n");
  //            for (StackTraceElement se :Thread.currentThread().getStackTrace()) {
  //                String s = se.toString();
  //                if (s.contains("sun.reflect.")) {
  //                    continue;
  //                }
  //                if (s.contains("junit.runners.")) {
  //                    continue;
  //                }
  //                if (s.contains("org.gradle.internal.")) {
  //                    continue;
  //                }
  //                if (s.contains("java.util.concurrent.ThreadPoolExecutor")) {
  //                    continue;
  //                }
  //                nameBuilder.append(s).append("\r\n");
  //            }
  //        }
  
          String name = nameBuilder.toString();
          Thread t = nonBlocking ? new RxCustomThread(r, name) : new Thread(r, name);
          t.setPriority(priority);
          t.setDaemon(true);
          return t;
      }
  
      @Override
      public String toString() {
          return "RxThreadFactory[" + prefix + "]";
      }
  
      static final class RxCustomThread extends Thread implements NonBlockingThread {
          RxCustomThread(Runnable run, String name) {
              super(run, name);
          }
      }
  }
  