Examples of org.springframework.retry.support.RetrySimulator

org.springframework.retry.support.RetrySimulator

A {@link RetrySimulator} is a tool for exercising retry + backoff operations.When calibrating a set of retry + backoff pairs, it is useful to know the behaviour of the retry for various scenarios. Things you may want to know: - Does a 'maxInterval' of 5000 ms in my backoff even matter? (This is often the case when retry counts are low -- so why set the max interval at something that cannot be achieved?) - What are the typical sleep durations for threads in a retry - What was the longest sleep duration for any retry sequence The simulator provides this information by executing a retry + backoff pair until failure (that is all retries are exhausted). The information about each retry is provided as part of the {@link RetrySimulation}. Note that the impetus for this class was to expose the timings which are possible with {@link org.springframework.retry.backoff.ExponentialRandomBackOffPolicy}, which provides random values and must be looked at over a series of trials. @author Jon Travis

    }


  @Test
   public void testSingleBackoff() throws Exception {
        ExponentialBackOffPolicy backOffPolicy = makeBackoffPolicy();
        RetrySimulator simulator = new RetrySimulator(backOffPolicy, makeRetryPolicy());
        RetrySimulation simulation = simulator.executeSimulation(1);


        List<Long> sleeps = simulation.getLongestTotalSleepSequence().getSleeps();
        System.out.println("Single trial of " + backOffPolicy + ": sleeps=" + sleeps);
        assertEquals(MAX_RETRIES - 1, sleeps.size());
        long initialInterval = backOffPolicy.getInitialInterval();

    }


  @Test
  public void testMultiBackOff() throws Exception {
        ExponentialBackOffPolicy backOffPolicy = makeBackoffPolicy();
        RetrySimulator simulator = new RetrySimulator(backOffPolicy, makeRetryPolicy());
        RetrySimulation simulation = simulator.executeSimulation(NUM_TRIALS);


        System.out.println("Ran " + NUM_TRIALS + " backoff trials.  Each trial retried " + MAX_RETRIES + " times");
        System.out.println("Policy: " + backOffPolicy);
        System.out.println("All generated backoffs:");
        System.out.println("    " + simulation.getPercentiles());

Examples of org.springframework.retry.support.RetrySimulator

Related Classes of org.springframework.retry.support.RetrySimulator