content: /*
   * Copyright 1999-2024 Alibaba Group Holding Ltd.
   *
   * 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 com.alibaba.csp.sentinel.util;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertTrue;
  
  import java.util.concurrent.atomic.AtomicBoolean;
  import java.util.concurrent.atomic.AtomicInteger;
  
  import org.junit.Before;
  import org.junit.Test;
  
  import com.alibaba.csp.sentinel.log.RecordLog;
  import com.alibaba.csp.sentinel.util.function.Tuple2;
  
  /**
   * @author jason
   *
   */
  public class TimeUtilTest {
      
      private void waitFor(int step, int seconds) throws InterruptedException {
          for (int i = 0; i < seconds; i ++) {
              Tuple2<Long, Long> qps = TimeUtil.instance().currentQps(TimeUtil.currentTimeMillis());
              RecordLog.info("step {} qps: reads={}, writes={}", step, qps.r1, qps.r2);
              Thread.sleep(1000);
          }
      }
      
      @Test
      public void test() throws InterruptedException {
          final AtomicInteger delayTime = new AtomicInteger(50);
          final AtomicBoolean shouldShutdown = new AtomicBoolean();
          for (int i = 0; i < 10; i ++) {
              new Thread(new Runnable() {
                  
                  @Override
                  public void run() {
                      long last = 0;
                      while (true) {
                          if (shouldShutdown.get()) {
                              break;
                          }
                          long now = TimeUtil.currentTimeMillis();
                          int delay = delayTime.get();
                          if (delay < 1) {
                              if (last > now) {
                                  System.err.println("wrong value");
                              }
                              last = now;
                              continue;
                          }
                          try {
                              Thread.sleep(delay);
                          } catch (InterruptedException e) {
                          }
                          if (last > now) {
                              System.err.println("incorrect value");
                          }
                          last = now;
                      }
                  }
              }).start();
          }
          Tuple2<Long, Long> qps;
          waitFor(1, 4);
          // initial state
          assertEquals(TimeUtil.STATE.IDLE, TimeUtil.instance().getState());
          qps = TimeUtil.instance().currentQps(TimeUtil.currentTimeMillis());
          assertTrue(qps.r1 < 1000);
          assertTrue(qps.r2 < 1000);
          
          // to RUNNING
          delayTime.set(0);
          // wait statistics to be stable
          waitFor(2, 8);
          qps = TimeUtil.instance().currentQps(TimeUtil.currentTimeMillis());
          assertEquals(TimeUtil.STATE.RUNNING, TimeUtil.instance().getState());
          assertTrue(qps.r1 > 1000);
          assertTrue(qps.r2 <= 1000);
          
          // back
          delayTime.set(100);
          // wait statistics to be stable
          waitFor(3, 8);
          qps = TimeUtil.instance().currentQps(TimeUtil.currentTimeMillis());
          assertEquals(TimeUtil.STATE.IDLE, TimeUtil.instance().getState());
          assertTrue(qps.r1 < 1000);
          assertTrue(qps.r2 < 1000);
          shouldShutdown.set(true);
      }
      
  }
  