Examples of org.springframework.retry.backoff.ExponentialBackOffPolicy

Package org.springframework.retry.backoff

Examples of org.springframework.retry.backoff.ExponentialBackOffPolicy

org.springframework.retry.backoff.ExponentialBackOffPolicy
Implementation of {@link BackOffPolicy} that increases the back off periodfor each retry attempt in a given set using the {@link Math#exp(double) exponential} function.
This implementation is thread-safe and suitable for concurrent access. Modifications to the configuration do not affect any retry sets that are already in progress.
The {@link #setInitialInterval(long)} property controls the initial valuepassed to {@link Math#exp(double)} and the {@link #setMultiplier(double)}property controls by how much this value is increased for each subsequent attempt. @author Rob Harrop @author Dave Syer @author Gary Russell @author Artem Bilan

   * @return this.
   */
  public RetryInterceptorBuilder<T> backOffOptions(long initialInterval, double multiplier, long maxInterval) {
    Assert.isNull(this.retryOperations, "cannot set the back off policy when a custom retryOperations has been set");
    Assert.isTrue(!this.backOffPolicySet, "cannot set the back off options when a back off policy has been set");
    ExponentialBackOffPolicy policy = new ExponentialBackOffPolicy();
    policy.setInitialInterval(initialInterval);
    policy.setMultiplier(multiplier);
    policy.setMaxInterval(maxInterval);
    this.retryTemplate.setBackOffPolicy(policy);
    this.backOffOptionsSet = true;
    this.templateAltered = true;
    return this;
  }

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  private BackOffPolicy getBackoffPolicy(Backoff backoff) {
    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) {
        policy.setSleeper(sleeper);
      }
      return policy;
    }
    if (max > min) {
      UniformRandomBackOffPolicy policy = new UniformRandomBackOffPolicy();
      policy.setMinBackOffPeriod(min);
      policy.setMaxBackOffPeriod(max);
      if (sleeper != null) {
        policy.setSleeper(sleeper);
      }
      return policy;
    }
    FixedBackOffPolicy policy = new FixedBackOffPolicy();
    policy.setBackOffPeriod(min);
    if (sleeper != null) {
      policy.setSleeper(sleeper);
    }
    return policy;
  }

View Full Code Here

    assertEquals("bar", result);
  }


  @Test
  public void testExponentialBackOffIsExponential() throws Throwable {
    ExponentialBackOffPolicy policy = new ExponentialBackOffPolicy();
    policy.setInitialInterval(100);
    policy.setMultiplier(1.5);
    RetryTemplate template = new RetryTemplate();
    template.setBackOffPolicy(policy);
    final List<Long> times = new ArrayList<Long>();
    RetryState retryState = new DefaultRetryState("bar");
    for (int i = 0; i < 3; i++) {

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    int maxAttempts = properties.getMaxAttempts(this.defaultMaxAttempts);
    if (maxAttempts > 1) {
      RetryTemplate template = new RetryTemplate();
      SimpleRetryPolicy retryPolicy = new SimpleRetryPolicy();
      retryPolicy.setMaxAttempts(maxAttempts);
      ExponentialBackOffPolicy backOffPolicy = new ExponentialBackOffPolicy();
      backOffPolicy.setInitialInterval(properties.getBackOffInitialInterval(this.defaultBackOffInitialInterval));
      backOffPolicy.setMultiplier(properties.getBackOffMultiplier(this.defaultBackOffMultiplier));
      backOffPolicy.setMaxInterval(properties.getBackOffMaxInterval(this.defaultBackOffMaxInterval));
      template.setRetryPolicy(retryPolicy);
      template.setBackOffPolicy(backOffPolicy);
      return template;
    }
    else {

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


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


    RetrySimulator simulator = new RetrySimulator(backOffPolicy, retryPolicy);
    RetrySimulation simulation = simulator.executeSimulation(1000);
    System.out.println(backOffPolicy);
    System.out.println("Longest sequence  " + simulation.getLongestTotalSleepSequence());

View Full Code Here

  @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());

View Full Code Here

   * @return this.
   */
  public RetryInterceptorBuilder<T> backOffOptions(long initialInterval, double multiplier , long maxInterval) {
    Assert.isNull(this.retryOperations, "cannot set the back off policy when a custom retryOperations has been set");
    Assert.isTrue(!this.backOffPolicySet, "cannot set the back off options when a back off policy has been set");
    ExponentialBackOffPolicy policy = new ExponentialBackOffPolicy();
    policy.setInitialInterval(initialInterval);
    policy.setMultiplier(multiplier);
    policy.setMaxInterval(maxInterval);
    this.retryTemplate.setBackOffPolicy(policy);
    this.backOffOptionsSet = true;
    this.templateAltered = true;
    return this;
  }

View Full Code Here

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