| /* |
| * 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.flink.connector.base.sink; |
| |
| import org.apache.flink.annotation.PublicEvolving; |
| import org.apache.flink.api.connector.sink.Committer; |
| import org.apache.flink.api.connector.sink.GlobalCommitter; |
| import org.apache.flink.api.connector.sink.Sink; |
| import org.apache.flink.core.io.SimpleVersionedSerializer; |
| |
| import java.io.Serializable; |
| import java.util.Collection; |
| import java.util.Optional; |
| |
| /** |
| * A generic sink for destinations that provide an async client to persist data. |
| * |
| * <p>The design of the sink focuses on extensibility and a broad support of destinations. The core |
| * of the sink is kept generic and free of any connector specific dependencies. The sink is designed |
| * to participate in checkpointing to provide at-least once semantics, but it is limited to |
| * destinations that provide a client that supports async requests. |
| * |
| * <p>Limitations: |
| * |
| * <ul> |
| * <li>The sink is designed for destinations that provide an async client. Destinations that |
| * cannot ingest events in an async fashion cannot be supported by the sink. |
| * <li>The sink usually persist InputTs in the order they are added to the sink, but reorderings |
| * may occur, eg, when RequestEntryTs need to be retried. |
| * <li>We are not considering support for exactly-once semantics at this point. |
| * </ul> |
| */ |
| @PublicEvolving |
| public abstract class AsyncSinkBase<InputT, RequestEntryT extends Serializable> |
| implements Sink<InputT, Void, Collection<RequestEntryT>, Void> { |
| |
| @Override |
| public Optional<Committer<Void>> createCommitter() { |
| return Optional.empty(); |
| } |
| |
| @Override |
| public Optional<GlobalCommitter<Void, Void>> createGlobalCommitter() { |
| return Optional.empty(); |
| } |
| |
| @Override |
| public Optional<SimpleVersionedSerializer<Void>> getCommittableSerializer() { |
| return Optional.empty(); |
| } |
| |
| @Override |
| public Optional<SimpleVersionedSerializer<Void>> getGlobalCommittableSerializer() { |
| return Optional.empty(); |
| } |
| } |