content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you 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 org.apache.cassandra.transport;
  
  import java.util.concurrent.TimeUnit;
  
  import org.junit.Assert;
  import org.junit.Test;
  
  public class QueueBackpressureTest
  {
      @Test
      public void testQueueBackpressure()
      {
          QueueBackpressure.Incident backpressure = new QueueBackpressure.Incident(() -> TimeUnit.MILLISECONDS.toNanos(10),
                                                                                   () -> TimeUnit.MILLISECONDS.toNanos(100),
                                                                                   -1, 0, 0);
  
          Assert.assertEquals(0, backpressure.delay(TimeUnit.NANOSECONDS));
          backpressure = backpressure.mark(backpressure.appliedAt() + TimeUnit.MILLISECONDS.toNanos(100));
          Assert.assertEquals(backpressure.minDelayNanos(), backpressure.delay(TimeUnit.NANOSECONDS));
          // up to 9 times
          for (int i = 1; i < 10; i++)
              backpressure = backpressure.mark(backpressure.appliedAt() + TimeUnit.MILLISECONDS.toNanos(100));
          Assert.assertEquals(backpressure.minDelayNanos(), backpressure.delay(TimeUnit.NANOSECONDS));
  
          // 10th time
          backpressure = backpressure.mark(backpressure.appliedAt() + TimeUnit.MILLISECONDS.toNanos(100));
          Assert.assertEquals(backpressure.minDelayNanos() * 2, backpressure.delay(TimeUnit.NANOSECONDS));
  
          for (int i = 0; i < 40; i++)
              backpressure = backpressure.mark(backpressure.appliedAt() + TimeUnit.MILLISECONDS.toNanos(100));
  
          Assert.assertEquals(backpressure.minDelayNanos() * 6, backpressure.delay(TimeUnit.NANOSECONDS));
  
          for (int i = 0; i < 1000; i++)
              backpressure = backpressure.mark(backpressure.appliedAt() + TimeUnit.MILLISECONDS.toNanos(100));
  
          Assert.assertEquals(backpressure.maxDelayNanos(), backpressure.delay(TimeUnit.NANOSECONDS));
  
          backpressure = backpressure.mark(backpressure.appliedAt() + TimeUnit.MILLISECONDS.toNanos(1001));
          Assert.assertEquals(backpressure.minDelayNanos(), backpressure.delay(TimeUnit.NANOSECONDS));
      }
  }
  