content: /*
   * The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
   * (the "License"). You may not use this work except in compliance with the License, which is
   * available at www.apache.org/licenses/LICENSE-2.0
   *
   * This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
   * either express or implied, as more fully set forth in the License.
   *
   * See the NOTICE file distributed with this work for information regarding copyright ownership.
   */
  
  package alluxio.retry;
  
  import static org.junit.Assert.assertTrue;
  
  import org.junit.Test;
  
  /**
   * Tests the {@link ExponentialBackoffRetry} class.
   */
  public final class ExponentialBackoffRetryTest {
  
    /**
     * Ensures that a lot of retries always produce a positive time.
     */
    @Test
    public void largeRetriesProducePositiveTime() {
      int max = 1000;
      MockExponentialBackoffRetry backoff =
          new MockExponentialBackoffRetry(50, Integer.MAX_VALUE, max);
      for (int i = 0; i < max; i++) {
        backoff.setRetryCount(i);
        long time = backoff.getSleepTime();
        assertTrue("Time must always be positive: " + time, time > 0);
      }
    }
  
    /**
     * Mocks the {@link ExponentialBackoffRetry} class.
     */
    public static final class MockExponentialBackoffRetry extends ExponentialBackoffRetry {
      private int mRetryCount = 0;
  
      /**
       * Constructs a new mock.
       *
       * @param baseSleepTimeMs the basic sleep time in milliseconds
       * @param maxSleepMs the max sleep time in milliseconds
       * @param maxRetries the max count of retries
       */
      public MockExponentialBackoffRetry(int baseSleepTimeMs, int maxSleepMs, int maxRetries) {
        super(baseSleepTimeMs, maxSleepMs, maxRetries);
      }
  
      @Override
      public int getAttemptCount() {
        return mRetryCount;
      }
  
      /**
       * Sets the count of retries.
       *
       * @param retryCount the count of retries
       */
      public void setRetryCount(int retryCount) {
        mRetryCount = retryCount;
      }
    }
  }
  