| /* |
| * 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.pulsar.functions.api.state; |
| |
| import java.nio.ByteBuffer; |
| import java.util.concurrent.CompletableFuture; |
| import org.apache.pulsar.functions.api.StateStore; |
| |
| /** |
| * A key-value state store that stores values in {@link ByteBuffer}. |
| */ |
| public interface ByteBufferStateStore extends StateStore { |
| |
| /** |
| * Update the state value for the key. |
| * |
| * @param key name of the key |
| * @param value state value of the key |
| */ |
| void put(String key, ByteBuffer value); |
| |
| /** |
| * Update the state value for the key, but don't wait for the operation to be completed. |
| * |
| * @param key name of the key |
| * @param value state value of the key |
| */ |
| CompletableFuture<Void> putAsync(String key, ByteBuffer value); |
| |
| /** |
| * Delete the state value for the key. |
| * |
| * @param key name of the key |
| */ |
| void delete(String key); |
| |
| /** |
| * Delete the state value for the key, but don't wait for the operation to be completed. |
| * |
| * @param key name of the key |
| */ |
| CompletableFuture<Void> deleteAsync(String key); |
| |
| /** |
| * Retrieve the state value for the key. |
| * |
| * @param key name of the key |
| * @return the state value for the key. |
| */ |
| ByteBuffer get(String key); |
| |
| /** |
| * Retrieve the state value for the key, but don't wait for the operation to be completed. |
| * |
| * @param key name of the key |
| * @return the state value for the key. |
| */ |
| CompletableFuture<ByteBuffer> getAsync(String key); |
| |
| /** |
| * Retrieve the StateValue for the key. |
| * |
| * @param key name of the key |
| * @return the StateValue. |
| */ |
| default StateValue getStateValue(String key) { |
| return getStateValueAsync(key).join(); |
| } |
| |
| /** |
| * Retrieve the StateValue for the key, but don't wait for the operation to be completed. |
| * |
| * @param key name of the key |
| * @return the StateValue. |
| */ |
| default CompletableFuture<StateValue> getStateValueAsync(String key) { |
| return getAsync(key).thenApply(val -> { |
| if (val != null && val.remaining() >= 0) { |
| byte[] data = new byte[val.remaining()]; |
| val.get(data); |
| return new StateValue(data, null, null); |
| } else { |
| return null; |
| } |
| }); |
| } |
| } |