Examples of org.springframework.retry.backoff.ExponentialRandomBackOffPolicy$ExponentialRandomBackOffContext

Package org.springframework.retry.backoff

Examples of org.springframework.retry.backoff.ExponentialRandomBackOffPolicy$ExponentialRandomBackOffContext

org.springframework.retry.backoff.ExponentialRandomBackOffPolicy
Implementation of {@link org.springframework.retry.backoff.ExponentialBackOffPolicy} thatchooses a random multiple of the interval. The random multiple is selected based on how many iterations have occurred. This has shown to at least be useful in testing scenarios where excessive contention is generated by the test needing many retries. In test, usually threads are started at the same time, and thus stomp together onto the next interval. Using this {@link BackOffPolicy} can help avoid that scenario.Example: initialInterval = 50 multiplier = 2.0 maxInterval = 3000 numRetries = 5 {@link ExponentialBackOffPolicy} yields: [50, 100, 200, 400, 800]{@link ExponentialRandomBackOffPolicy} may yield [50, 100, 100, 100, 600]or [50, 100, 150, 400, 800] @author Jon Travis @author Dave Syer

    long min = backoff.delay() == 0 ? backoff.value() : backoff.delay();
    long max = backoff.maxDelay();
    if (backoff.multiplier() > 0) {
      ExponentialBackOffPolicy policy = new ExponentialBackOffPolicy();
      if (backoff.random()) {
        policy = new ExponentialRandomBackOffPolicy();
      }
      policy.setInitialInterval(min);
      policy.setMultiplier(backoff.multiplier());
      policy.setMaxInterval(max > min ? max : ExponentialBackOffPolicy.DEFAULT_MAX_INTERVAL);
      if (sleeper != null) {

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  @Test
  public void testSimulatorExercisesRandomExponentialBackoff() {
    SimpleRetryPolicy retryPolicy = new SimpleRetryPolicy();
    retryPolicy.setMaxAttempts(5);


    ExponentialBackOffPolicy backOffPolicy = new ExponentialRandomBackOffPolicy();
    backOffPolicy.setMultiplier(2);
    backOffPolicy.setMaxInterval(30000);
    backOffPolicy.setInitialInterval(100);


    RetrySimulator simulator = new RetrySimulator(backOffPolicy, retryPolicy);
    RetrySimulation simulation = simulator.executeSimulation(10000);
    System.out.println(backOffPolicy);
    System.out.println("Longest sequence  " + simulation.getLongestTotalSleepSequence());

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Related Classes of org.springframework.retry.backoff.ExponentialRandomBackOffPolicy$ExponentialRandomBackOffContext

org.springframework.retry.annotation.AnnotationAwareRetryOperationsInterceptor

org.springframework.retry.support.RetrySimulationTests

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