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.testsupport;
  
  import java.util.concurrent.TimeUnit;
  
  import io.reactivex.rxjava3.core.Scheduler;
  import io.reactivex.rxjava3.disposables.*;
  
  /**
   * Basic scheduler that produces an ever increasing {@link #now(TimeUnit)} value.
   * Use this scheduler only as a time source!
   */
  public final class TimesteppingScheduler extends Scheduler {
  
      final class TimesteppingWorker extends Worker {
          @Override
          public void dispose() {
          }
  
          @Override
          public boolean isDisposed() {
              return false;
          }
  
          @Override
          public Disposable schedule(Runnable run, long delay, TimeUnit unit) {
              run.run();
              return Disposable.disposed();
          }
  
          @Override
          public long now(TimeUnit unit) {
              return TimesteppingScheduler.this.now(unit);
          }
      }
  
      public long time;
  
      public boolean stepEnabled = true;
  
      @Override
      public Worker createWorker() {
          return new TimesteppingWorker();
      }
  
      @Override
      public long now(TimeUnit unit) {
          if (stepEnabled) {
              return time++;
          }
          return time;
      }
  }
  