text: /*
   * Copyright (c) Facebook, Inc. and its affiliates.
   *
   * 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.
   */
  
  // Copyright 2004-present Facebook. All Rights Reserved.
  
  #include <gtest/gtest.h>
  
  #include <thread>
  
  #include "cachelib/cachebench/cache/TimeStampTicker.h"
  
  namespace facebook {
  namespace cachelib {
  namespace cachebench {
  namespace test {
  
  TEST(TimeStampTickerTest, callbackTest) {
    int called = 0;
    auto callback = [&called](double) { ++called; };
  
    uint32_t numThreads = 3;
    TimeStampTicker ticker{numThreads, 1, callback};
  
    auto threadFunc = [&ticker]() {
      ticker.updateTimeStamp(1);
      ticker.updateTimeStamp(2);
    };
    std::vector<std::thread> threads;
    for (size_t i = 0; i < numThreads; i++) {
      threads.push_back(std::thread{threadFunc});
    }
    for (size_t i = 0; i < numThreads; i++) {
      threads[i].join();
    }
    // Expect callback to be called twice since each thread passed two time
    // windows.
    EXPECT_EQ(2, called);
  }
  
  } // namespace test
  } // namespace cachebench
  } // namespace cachelib
  } // namespace facebook
  