| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.apache.bookkeeper.api.kv; |
| |
| import static io.netty.util.ReferenceCountUtil.retain; |
| |
| import java.util.concurrent.CompletableFuture; |
| import org.apache.bookkeeper.api.kv.exceptions.KvApiException; |
| import org.apache.bookkeeper.api.kv.options.Options; |
| import org.apache.bookkeeper.api.kv.options.RangeOption; |
| import org.apache.bookkeeper.api.kv.result.Code; |
| import org.apache.bookkeeper.api.kv.result.KeyValue; |
| import org.apache.bookkeeper.api.kv.result.RangeResult; |
| import org.apache.bookkeeper.common.annotation.InterfaceAudience; |
| import org.apache.bookkeeper.common.annotation.InterfaceStability; |
| import org.apache.bookkeeper.common.concurrent.FutureUtils; |
| |
| /** |
| * A review view of a key/value space. |
| */ |
| @InterfaceAudience.Public |
| @InterfaceStability.Evolving |
| public interface TableReadView<K, V> extends PTableBase<K, V> { |
| |
| CompletableFuture<RangeResult<K, V>> get(K key, RangeOption<K> option); |
| |
| 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()); |
| |
| } |
| |
| default CompletableFuture<KeyValue<K, V>> getKv(K key) { |
| return get(key, Options.get()) |
| .thenApply(result -> { |
| try { |
| if (result.count() == 0) { |
| return null; |
| } else { |
| return result.getKvsAndClear().get(0); |
| } |
| } finally { |
| result.close(); |
| } |
| }); |
| } |
| |
| } |