How to use

numberValue

method

in

org.apache.bookkeeper.api.kv.result.KeyValue

if (kv.version() > lastVersion) {
  if (kv.isNumber()) {
    System.out.println("value = " + kv.numberValue());
  } else {
    System.out.println("value = " + new String(ByteBufUtil.getBytes(kv.value()), UTF_8));

default CompletableFuture<Long> getNumber(K pKey, K lKey) {
  RangeOption<K> option = opFactory().optionFactory().newRangeOption().build();
  return get(pKey, lKey, option)
    .thenCompose(result -> {
      try {
        if (result.count() == 0) {
          return FutureUtils.value(null);
        } else {
          KeyValue<K, V> kv = result.kvs().get(0);
          if (kv.isNumber()) {
            return FutureUtils.value(kv.numberValue());
          } else {
            return FutureUtils.exception(new KvApiException(
              Code.ILLEGAL_OP, "Key (" + pKey + ", " + lKey + ") doesn't have any number value"));
          }
        }
      } finally {
        result.close();
      }
    })
    .whenComplete((value, cause) -> option.close());
}

default CompletableFuture<Long> getNumber(K key) {
  RangeOption<K> option = opFactory().optionFactory().newRangeOption().build();
  return get(key, option)
    .thenCompose(result -> {
      try {
        if (result.count() == 0) {
          return FutureUtils.value(null);
        } else {
          KeyValue<K, V> kv = result.kvs().get(0);
          if (kv.isNumber()) {
            return FutureUtils.value(kv.numberValue());
          } else {
            return FutureUtils.exception(new KvApiException(
              Code.ILLEGAL_OP, "Key (" + key + ") doesn't have any number value"));
          }
        }
      } finally {
        result.close();
      }
    })
    .whenComplete((value, cause) -> option.close());
}

Long getNumber(K key) {
  try (RangeOp<K, V> op = opFactory.newRange(
    key,
    opFactory.optionFactory().newRangeOption()
      .limit(1)
      .build())) {
    try (RangeResult<K, V> result = range(op)) {
      if (Code.OK != result.code()) {
        throw new MVCCStoreException(result.code(),
          "Failed to retrieve key from store " + name + " : code = " + result.code());
      }
      if (result.count() <= 0) {
        return null;
      } else {
        return result.kvs().get(0).numberValue();
      }
    }
  }
}