How to use

KeyValue

in

org.apache.bookkeeper.api.kv.result

  System.out.println("key '" + key + "' doesn't exist.");
} else {
  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));
    lastVersion = kv.version();

public PutResultImpl<K, V> prevKv(KeyValue<K, V> kv) {
  if (null != prevKv) {
    prevKv.close();
  }
  prevKv = kv;
  return this;
}

default CompletableFuture<V> delete(K pKey, K lKey) {
  return delete(pKey, lKey, Options.deleteAndGet())
    .thenApply(result -> {
      try {
        List<KeyValue<K, V>> prevKvs = result.prevKvs();
        if (prevKvs.isEmpty()) {
          return null;
        } else {
          return retain(prevKvs.get(0).value());
        }
      } finally {
        result.close();
      }
    });
}

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());
}

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();
      }
    }
  }
}

default CompletableFuture<V> delete(K key) {
  return delete(key, Options.deleteAndGet())
    .thenApply(result -> {
      try {
        List<KeyValue<K, V>> prevKvs = result.prevKvs();
        if (prevKvs.isEmpty()) {
          return null;
        } else {
          return retain(prevKvs.get(0).value());
        }
      } finally {
        result.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());
}

default CompletableFuture<V> get(K key) {
  RangeOption<K> option = opFactory().optionFactory().newRangeOption().build();
  return get(key, option)
    .thenApply(result -> {
      try {
        if (result.count() == 0) {
          return null;
        } else {
          return retain(result.kvs().get(0).value());
        }
      } finally {
        result.close();
      }
    })
    .whenComplete((value, cause) -> option.close());
}

@Override
protected void reset() {
  if (null != prevKv) {
    prevKv.close();
    prevKv = null;
  }
  super.reset();
}

default CompletableFuture<V> get(K pKey, K lKey) {
  RangeOption<K> option = opFactory().optionFactory().newRangeOption().build();
  return get(pKey, lKey, option)
    .thenApply(result -> {
      try {
        if (result.count() == 0) {
          return null;
        } else {
          return retain(result.kvs().get(0).value());
        }
      } finally {
        result.close();
      }
    })
    .whenComplete((value, cause) -> option.close());
}

@Override
default CompletableFuture<V> delete(K k) {
  DeleteOp<K, V> op = getOpFactory().newDelete(
    k,
    Options.deleteAndGet());
  return delete(op).thenCompose(result -> {
    try {
      if (Code.OK == result.code()) {
        List<KeyValue<K, V>> prevKvs = result.prevKvs();
        if (prevKvs.isEmpty()) {
          return FutureUtils.value(null);
        } else {
          return FutureUtils.value(prevKvs.get(0).value());
        }
      } else {
        return failWithCode(result.code(),
          "Fail to delete key " + k + " from store " + name());
      }
    } finally {
      result.close();
    }
  });
}

@Override
default CompletableFuture<V> get(K key) {
  RangeOp<K, V> op = getOpFactory().newRange(
    key,
    Options.get());
  return range(op).thenCompose(result -> {
    try {
      if (Code.OK == result.code()) {
        if (result.kvs().isEmpty()) {
          return FutureUtils.value(null);
        } else {
          return FutureUtils.value(retain(result.kvs().get(0).value()));
        }
      } else {
        return failWithCode(result.code(), "Failed to retrieve key " + key + " from store " + name());
      }
    } finally {
      result.close();
    }
  });
}

@Override
public synchronized V get(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 retain(result.kvs().get(0).value());
      }
    }
  }
}

    "Key " + k + " not found when putIfAbsent failed at store " + name());
} else {
  return FutureUtils.value(retain(rangeResult.kvs().get(0).value()));

      "Key " + lKey + " not found when putIfAbsent failed"));
} else {
  return FutureUtils.value(retain(rangeResult.kvs().get(0).value()));

      "Key " + lKey + " not found when putIfAbsent failed"));
} else {
  return FutureUtils.value(retain(rangeResult.kvs().get(0).value()));