YugabyteDB (2.13.0.0-b42, bfc6a6643e7399ac8a0e81d06a3ee6d6571b33ab)

// Copyright (c) YugaByte, Inc.

//

// 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.

//

#ifndef YB_UTIL_PHYSICAL_TIME_H

#define YB_UTIL_PHYSICAL_TIME_H

#include <functional> // For std::function

#include <memory>

#include <boost/atomic.hpp>

#include "yb/util/status_fwd.h"

namespace yb {

using MicrosTime = uint64_t;

struct PhysicalTime {

  MicrosTime time_point;

  MicrosTime max_error;

  std::string ToString() const;

};

class PhysicalClock {

 public:

  virtual Result<PhysicalTime> Now() = 0;

  virtual MicrosTime MaxGlobalTime(PhysicalTime time) = 0;

  virtual ~PhysicalClock() {}

};

typedef std::shared_ptr<PhysicalClock> PhysicalClockPtr;

typedef std::function<PhysicalClockPtr(const std::string&)> PhysicalClockProvider;

// Clock with user controlled return values.

class MockClock : public PhysicalClock {

 public:

  Result<PhysicalTime> Now() override;

  MicrosTime MaxGlobalTime(PhysicalTime time) override {

    return time.time_point;

  }

  void Set(const PhysicalTime& value);

  // Constructs PhysicalClockPtr from this object.

  PhysicalClockPtr AsClock();

  // Constructs PhysicalClockProvider from this object.

  PhysicalClockProvider AsProvider();

 private:

  // Set by calls to SetMockClockWallTimeForTests().

  // For testing purposes only.

  boost::atomic<PhysicalTime> value_{{0, 0}};

};

const PhysicalClockPtr& WallClock();

#if !defined(__APPLE__)

const PhysicalClockPtr& AdjTimeClock();

#endif

} // namespace yb

#endif // YB_UTIL_PHYSICAL_TIME_H