wangyang0918 commented on a change in pull request #13644: URL: https://github.com/apache/flink/pull/13644#discussion_r508985458
########## File path: flink-runtime/src/main/java/org/apache/flink/runtime/leaderelection/AbstractLeaderElectionService.java ########## @@ -0,0 +1,227 @@ +/* + * 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.runtime.leaderelection; + +import org.apache.flink.util.Preconditions; + +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import javax.annotation.Nonnull; +import javax.annotation.concurrent.GuardedBy; + +import java.util.UUID; + +/** + * Abstract class for leader election service based on distributed coordination system(e.g. Zookeeper, Kubernetes, etc.). + */ +public abstract class AbstractLeaderElectionService implements LeaderElectionService { + + protected final Logger logger = LoggerFactory.getLogger(getClass()); + + protected final Object lock = new Object(); Review comment: I will try to use the composition for the abstraction. Just like you said, it could help us to better control the `lock` and make the contract more clear. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected]
