Java Code Examples for com.google.common.math.LongMath#pow()

static int bitsForNumElementsWithLoadFactor(long numElements) {
    if (numElements == 0) {
        return 1;
    }

    int candidateBits = Long.bitCount(numElements) == 1 ?
            Math.max(1, Long.numberOfTrailingZeros(numElements)) :
            Long.numberOfTrailingZeros(Long.highestOneBit(numElements) << 1L);

    //May need an extra bit due to load factor
    if (((long) (LongMath.pow(2, candidateBits) * 0.75)) < numElements) {
        candidateBits++;
    }

    return candidateBits;
}
 

static int bitsForNumElementsWithLoadFactor(long numElements) {
    if (numElements == 0) {
        return 1;
    }

    int candidateBits = Long.bitCount(numElements) == 1 ?
            Math.max(1, Long.numberOfTrailingZeros(numElements)) :
            Long.numberOfTrailingZeros(Long.highestOneBit(numElements) << 1L);

    //May need an extra bit due to load factor
    if (((long) (LongMath.pow(2, candidateBits) * 0.75)) < numElements) {
        candidateBits++;
    }

    return candidateBits;
}
 

private long calculateRetryBackoffMs() {
  int retry = batch.getRetries();
  long retryBackoffMs = producerConfig.getBaseRetryBackoffMs() * LongMath.pow(2, retry);
  if (retryBackoffMs <= 0) {
    retryBackoffMs = producerConfig.getMaxRetryBackoffMs();
  }
  return Math.min(retryBackoffMs, producerConfig.getMaxRetryBackoffMs());
}
 

public long asBytes() {
    switch (unit) {
        case G:
            return value * LongMath.pow(base, 3);
        case M:
            return value * LongMath.pow(base, 2);
        case K:
            return value * LongMath.pow(base, 1);
        default:
            return value;
    }
}
 

private void buildChartAndTableEntries(List<Offer> sortedList,
                                       OfferPayload.Direction direction,
                                       List<XYChart.Data<Number, Number>> data,
                                       ObservableList<OfferListItem> offerTableList) {
    data.clear();
    double accumulatedAmount = 0;
    List<OfferListItem> offerTableListTemp = new ArrayList<>();
    for (Offer offer : sortedList) {
        Price price = offer.getPrice();
        if (price != null) {
            double amount = (double) offer.getAmount().value / LongMath.pow(10, offer.getAmount().smallestUnitExponent());
            accumulatedAmount += amount;
            offerTableListTemp.add(new OfferListItem(offer, accumulatedAmount));

            double priceAsDouble = (double) price.getValue() / LongMath.pow(10, price.smallestUnitExponent());
            if (CurrencyUtil.isCryptoCurrency(getCurrencyCode())) {
                if (direction.equals(OfferPayload.Direction.SELL))
                    data.add(0, new XYChart.Data<>(priceAsDouble, accumulatedAmount));
                else
                    data.add(new XYChart.Data<>(priceAsDouble, accumulatedAmount));
            } else {
                if (direction.equals(OfferPayload.Direction.BUY))
                    data.add(0, new XYChart.Data<>(priceAsDouble, accumulatedAmount));
                else
                    data.add(new XYChart.Data<>(priceAsDouble, accumulatedAmount));
            }
        }
    }
    offerTableList.setAll(offerTableListTemp);
}
 

@Test
public void testSendWithRequestError() throws InterruptedException, ProducerException {
  ProducerConfig producerConfig = new ProducerConfig();
  int retries = 5;
  producerConfig.setRetries(retries);
  producerConfig.setMaxReservedAttempts(retries + 1);
  Producer producer = new LogProducer(producerConfig);
  producer.putProjectConfig(buildProjectConfig());
  ListenableFuture<Result> f = producer.send("project", "logStore", ProducerTest.buildLogItem());
  try {
    f.get();
  } catch (ExecutionException e) {
    ResultFailedException resultFailedException = (ResultFailedException) e.getCause();
    Result result = resultFailedException.getResult();
    Assert.assertFalse(result.isSuccessful());
    Assert.assertEquals("RequestError", result.getErrorCode());
    Assert.assertTrue(
        result.getErrorMessage().startsWith("Web request failed: project.endpoint"));
    List<Attempt> attempts = result.getReservedAttempts();
    Assert.assertEquals(retries + 1, attempts.size());
    long t1;
    long t2 = -1;
    for (int i = 0; i < attempts.size(); ++i) {
      Attempt attempt = attempts.get(i);
      Assert.assertFalse(attempt.isSuccess());
      Assert.assertEquals("RequestError", attempt.getErrorCode());
      Assert.assertTrue(
          attempt.getErrorMessage().startsWith("Web request failed: project.endpoint"));
      Assert.assertEquals("", attempt.getRequestId());
      t1 = t2;
      t2 = attempt.getTimestampMs();
      if (i == 0) {
        continue;
      }
      long diff = t2 - t1;
      long retryBackoffMs = producerConfig.getBaseRetryBackoffMs() * LongMath.pow(2, i - 1);
      long low = retryBackoffMs - (long) (producerConfig.getBaseRetryBackoffMs() * 0.1);
      long high = retryBackoffMs + (long) (producerConfig.getBaseRetryBackoffMs() * 0.2);
      if (i == 1) {
        Assert.assertTrue(low <= diff);
      } else {
        Assert.assertTrue(low <= diff && diff <= high);
      }
    }
  }
  producer.close();
  ProducerTest.assertProducerFinalState(producer);
}
 

@Test
public void whenPowTwoLongValues_shouldPowThemAndReturnTheResult() {
    long result = LongMath.pow(6L, 4);
    assertEquals(1296L, result);
}
 

/**
 * 平方
 * 
 * @param k 平方次数,不能为负数, k=0时返回1.
 */
public static long pow(long b, int k) {
	return LongMath.pow(b, k);
}
 

/**
 * 平方
 * 
 * @param k 平方次数,不能为负数, k=0时返回1.
 */
public static long pow(long b, int k) {
	return LongMath.pow(b, k);
}
 

/**
 * 平方
 * 
 * @param k 平方次数,不能为负数, k=0时返回1.
 */
public static long pow(long b, int k) {
	return LongMath.pow(b, k);
}