text: /*
   * The MIT License (MIT)
   *
   * Copyright (c) 2015 Microsoft Corporation
   *
   * -=- Robust Distributed System Nucleus (rDSN) -=-
   *
   * Permission is hereby granted, free of charge, to any person obtaining a copy
   * of this software and associated documentation files (the "Software"), to deal
   * in the Software without restriction, including without limitation the rights
   * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   * copies of the Software, and to permit persons to whom the Software is
   * furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in
   * all copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
   * THE SOFTWARE.
   */
  
  /*
   * Description:
   *     What is this file about?
   *
   * Revision history:
   *     xxxx-xx-xx, author, first version
   *     xxxx-xx-xx, author, fix bug about xxx
   */
  
  #pragma once
  
  #include <dsn/tool_api.h>
  
  namespace dsn {
  namespace tools {
  
  class sim_env_provider : public env_provider
  {
  public:
      sim_env_provider(env_provider *inner_provider);
  
      // service local time (can be logical or physical)
      virtual uint64_t now_ns() const override;
      static int seed() { return _seed; }
  
  private:
      static void on_worker_start(task_worker *worker);
      static int _seed;
  };
  }
  } // end namespace
  