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.bookkeeper.zookeeper;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertFalse;
  import static org.junit.Assert.assertTrue;
  
  import org.junit.Test;
  
  /**
   * Test the retry policy.
   */
  public class TestRetryPolicy {
  
      private static void assertTimeRange(long waitTime, long minTime, long maxTime) {
          assertTrue(waitTime >= minTime);
          assertTrue(waitTime <= maxTime);
      }
  
      @Test
      public void testExponentialBackoffRetryPolicy() throws Exception {
          RetryPolicy policy = new ExponentialBackoffRetryPolicy(1000, Integer.MAX_VALUE);
          assertTimeRange(policy.nextRetryWaitTime(30, 2000), 1000L, (long) (1000 * Math.pow(2, 31)));
          assertTimeRange(policy.nextRetryWaitTime(31, 2000), 1000L, (long) (1000 * Math.pow(2, 32)));
          assertTimeRange(policy.nextRetryWaitTime(32, 2000), 1000L, (long) (1000 * Math.pow(2, 33)));
          assertTimeRange(policy.nextRetryWaitTime(127, 2000), 1000L, 1000L);
          assertTimeRange(policy.nextRetryWaitTime(128, 2000), 1000L, 2000L);
          assertTimeRange(policy.nextRetryWaitTime(129, 2000), 1000L, 4000L);
      }
  
      @Test
      public void testBoundExponentialBackoffRetryPolicy() throws Exception {
          RetryPolicy policy = new BoundExponentialBackoffRetryPolicy(1000, 2000, Integer.MAX_VALUE);
          assertTimeRange(policy.nextRetryWaitTime(30, 2000), 1000L, 2000L);
          assertTimeRange(policy.nextRetryWaitTime(31, 2000), 1000L, 2000L);
          assertTimeRange(policy.nextRetryWaitTime(32, 2000), 1000L, 2000L);
          assertTimeRange(policy.nextRetryWaitTime(127, 2000), 1000L, 1000L);
          assertTimeRange(policy.nextRetryWaitTime(128, 2000), 1000L, 2000L);
          assertTimeRange(policy.nextRetryWaitTime(129, 2000), 1000L, 2000L);
      }
  
      @Test
      public void testExponentialBackoffWithDeadlineRetryPolicy() throws Exception {
          RetryPolicy policy = new ExponentialBackOffWithDeadlinePolicy(100, 55 * 1000, 20);
  
          // Retries are allowed as long as we don't exceed the limits of retry count and deadline
          assertTrue(policy.allowRetry(1, 5 * 1000));
          assertTrue(policy.allowRetry(4, 20 * 1000));
          assertTrue(policy.allowRetry(10, 50 * 1000));
  
          assertFalse(policy.allowRetry(0, 60 * 1000));
          assertFalse(policy.allowRetry(22, 20 * 1000));
          assertFalse(policy.allowRetry(22, 60 * 1000));
  
          // Verify that the wait times are in the range and with the excepted jitter, until deadline is exceeded
          assertTimeRange(policy.nextRetryWaitTime(0, 0), 0, 0);
          assertTimeRange(policy.nextRetryWaitTime(1, 0), 100, 110);
          assertTimeRange(policy.nextRetryWaitTime(1, 53 * 1000), 100, 110);
          assertTimeRange(policy.nextRetryWaitTime(2, 0), 200, 220);
          assertTimeRange(policy.nextRetryWaitTime(3, 0), 300, 330);
          assertTimeRange(policy.nextRetryWaitTime(3, 53 * 1000), 300, 330);
          assertTimeRange(policy.nextRetryWaitTime(4, 0), 500, 550);
          assertTimeRange(policy.nextRetryWaitTime(5, 0), 500, 550);
  
          // Verify that the final attempt is triggered at deadline.
          assertEquals(2000, policy.nextRetryWaitTime(10, 53 * 1000));
          assertEquals(4000, policy.nextRetryWaitTime(15, 51 * 1000));
      }
  }
  