Examples of org.springframework.util.backoff.ExponentialBackOff$ExponentialBackOffExecution

Package org.springframework.util.backoff

Examples of org.springframework.util.backoff.ExponentialBackOff$ExponentialBackOffExecution

org.springframework.util.backoff.ExponentialBackOff
Implementation of {@link BackOff} that increases the back off period for eachretry attempt. When the interval has reached the {@link #setMaxInterval(long) max interval}, it is no longer increased. Stops retrying once the {@link #setMaxElapsedTime(long) max elapsed time} has been reached.
Example: The default interval is {@value #DEFAULT_INITIAL_INTERVAL} ms,the default multiplier is {@value #DEFAULT_MULTIPLIER}, and the default max interval is {@value #DEFAULT_MAX_INTERVAL}. For 10 attempts the sequence will be as follows:
```
 request#     back off 1              2000 2              3000 3              4500 4              6750 5             10125 6             15187 7             22780 8             30000 9             30000 10             30000 
```
Note that the default max elapsed time is {@link Long#MAX_VALUE}. Use {@link #setMaxElapsedTime(long)} to limit the maximum length of timethat an instance should accumulate before returning {@link BackOffExecution#STOP}. @author Stephane Nicoll @since 4.1

  @Rule
  public final ExpectedException thrown = ExpectedException.none();


  @Test
  public void defaultInstance() {
    ExponentialBackOff backOff = new ExponentialBackOff();
    BackOffExecution execution = backOff.start();
    assertEquals(2000l, execution.nextBackOff());
    assertEquals(3000l, execution.nextBackOff());
    assertEquals(4500l, execution.nextBackOff());
  }

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    assertEquals(4500l, execution.nextBackOff());
  }


  @Test
  public void simpleIncrease() {
    ExponentialBackOff backOff = new ExponentialBackOff(100L, 2.0);
    BackOffExecution execution = backOff.start();
    assertEquals(100l, execution.nextBackOff());
    assertEquals(200l, execution.nextBackOff());
    assertEquals(400l, execution.nextBackOff());
    assertEquals(800l, execution.nextBackOff());
  }

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    assertEquals(800l, execution.nextBackOff());
  }


  @Test
  public void fixedIncrease() {
    ExponentialBackOff backOff = new ExponentialBackOff(100L, 1.0);
    backOff.setMaxElapsedTime(300l);


    BackOffExecution execution = backOff.start();
    assertEquals(100l, execution.nextBackOff());
    assertEquals(100l, execution.nextBackOff());
    assertEquals(100l, execution.nextBackOff());
    assertEquals(BackOffExecution.STOP, execution.nextBackOff());
  }

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    assertEquals(BackOffExecution.STOP, execution.nextBackOff());
  }


  @Test
  public void maxIntervalReached() {
    ExponentialBackOff backOff = new ExponentialBackOff(2000L, 2.0);
    backOff.setMaxInterval(4000L);


    BackOffExecution execution = backOff.start();
    assertEquals(2000l, execution.nextBackOff());
    assertEquals(4000l, execution.nextBackOff());
    assertEquals(4000l, execution.nextBackOff()); // max reached
    assertEquals(4000l, execution.nextBackOff());
  }

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    assertEquals(4000l, execution.nextBackOff());
  }


  @Test
  public void maxAttemptsReached() {
    ExponentialBackOff backOff = new ExponentialBackOff(2000L, 2.0);
    backOff.setMaxElapsedTime(4000L);


    BackOffExecution execution = backOff.start();
    assertEquals(2000l, execution.nextBackOff());
    assertEquals(4000l, execution.nextBackOff());
    assertEquals(BackOffExecution.STOP, execution.nextBackOff()); // > 4 sec wait in total
  }

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    assertEquals(BackOffExecution.STOP, execution.nextBackOff()); // > 4 sec wait in total
  }


  @Test
  public void startReturnDifferentInstances() {
    ExponentialBackOff backOff = new ExponentialBackOff();
    backOff.setInitialInterval(2000L);
    backOff.setMultiplier(2.0);
    backOff.setMaxElapsedTime(4000L);


    BackOffExecution execution = backOff.start();
    BackOffExecution execution2 = backOff.start();


    assertEquals(2000l, execution.nextBackOff());
    assertEquals(2000l, execution2.nextBackOff());
    assertEquals(4000l, execution.nextBackOff());
    assertEquals(4000l, execution2.nextBackOff());

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    assertEquals(BackOffExecution.STOP, execution2.nextBackOff());
  }


  @Test
  public void invalidInterval() {
    ExponentialBackOff backOff = new ExponentialBackOff();


    thrown.expect(IllegalArgumentException.class);
    backOff.setMultiplier(0.9);
  }

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    backOff.setMultiplier(0.9);
  }


  @Test
  public void maxIntervalReachedImmediately() {
    ExponentialBackOff backOff = new ExponentialBackOff(1000L, 2.0);
    backOff.setMaxInterval(50L);


    BackOffExecution execution = backOff.start();
    assertEquals(50L, execution.nextBackOff());
    assertEquals(50L, execution.nextBackOff());
  }

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    assertEquals(50L, execution.nextBackOff());
  }


  @Test
  public void toStringContent() {
    ExponentialBackOff backOff = new ExponentialBackOff(2000L, 2.0);
    BackOffExecution execution = backOff.start();
    assertEquals("ExponentialBackOff{currentInterval=n/a, multiplier=2.0}", execution.toString());
    execution.nextBackOff();
    assertEquals("ExponentialBackOff{currentInterval=2000ms, multiplier=2.0}", execution.toString());
    execution.nextBackOff();
    assertEquals("ExponentialBackOff{currentInterval=4000ms, multiplier=2.0}", execution.toString());

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Related Classes of org.springframework.util.backoff.ExponentialBackOff$ExponentialBackOffExecution

org.springframework.util.ExponentialBackOffTests

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