vernedeng commented on code in PR #9929: URL: https://github.com/apache/inlong/pull/9929#discussion_r1554829318
########## inlong-audit/audit-service/src/main/java/elector/impl/DBDataSource.java: ########## @@ -0,0 +1,307 @@ +/* + * 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 elector.impl; + +import com.zaxxer.hikari.HikariConfig; +import com.zaxxer.hikari.HikariDataSource; +import elector.api.ElectorConfig; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import java.sql.Connection; +import java.sql.PreparedStatement; +import java.sql.ResultSet; +import java.text.MessageFormat; +import java.util.concurrent.atomic.AtomicInteger; + +/** + * DB data source + */ +public class DBDataSource { + + private static final Logger logger = LoggerFactory.getLogger(DBDataSource.class); + private String electorSql = + "insert ignore into {0} (service_id, leader_id, last_seen_active) values (''{1}'', ''{2}'', now()) on duplicate key update leader_id = if(last_seen_active < now() - interval # second, values(leader_id), leader_id),last_seen_active = if(leader_id = values(leader_id), values(last_seen_active), last_seen_active)"; + private String replaceLeaderSql = + "replace into {0} (\n service_id, leader_id, last_seen_active )\nvalues (''{1}'', ''#'', now())"; + private String reLeaseSql = "delete from {0} where service_id=''{1}'' and leader_id= ''{2}''"; + private String isLeaderSql = "select count(*) as is_leader from {0} where service_id=''{1}'' and leader_id=''{2}''"; + private String searchCurrentLeaderSql = "select leader_id as leader from {0} where service_id=''{1}''"; + private ElectorConfig electorConfig; + private HikariDataSource datasource; + public AtomicInteger getConnectionFailTimes; + + public DBDataSource(ElectorConfig electorConfig) { + this.electorConfig = electorConfig; + this.getConnectionFailTimes = new AtomicInteger(0); + } + + /** + * init + * + * @param reBuildDataSource + * @throws Exception + */ + public void init(boolean reBuildDataSource) throws Exception { + try { + if (!electorConfig.isUseDefaultLeader()) { + initDataSource(); + if (!reBuildDataSource) { + formatSql(electorConfig.getElectorDbName(), electorConfig.getServiceId(), + electorConfig.getLeaderId()); + } + + } + } catch (Exception exception) { + logger.error(exception.getMessage()); + throw exception; + } + } + + /** + * init data source + * + * @throws Exception + */ + public void initDataSource() throws Exception { + boolean initSucc = false; + int initCount = 0; + + while (!initSucc && initCount < 2) { + try { + ++initCount; + if (datasource == null || datasource.isClosed()) { + HikariConfig config = new HikariConfig(); + config.setDriverClassName(electorConfig.getDbDriver()); + logger.info("## init dataSource:" + electorConfig.getDbUrl()); + config.setJdbcUrl(electorConfig.getDbUrl()); + config.setUsername(electorConfig.getDbUser()); + config.setPassword(electorConfig.getDbPasswd()); + config.setMaximumPoolSize(electorConfig.getMaximumPoolSize()); + config.setAutoCommit(true); + config.setConnectionTimeout((long) electorConfig.getConnectionTimeout()); + config.setMaxLifetime((long) electorConfig.getMaxLifetime()); + config.addDataSourceProperty("cachePrepStmts", electorConfig.getCachePrepStmts()); + config.addDataSourceProperty("prepStmtCacheSize", electorConfig.getPrepStmtCacheSize()); + config.addDataSourceProperty("prepStmtCacheSqlLimit", + electorConfig.getPrepStmtCacheSqlLimit()); + config.setConnectionTestQuery("SELECT 1"); + datasource = new HikariDataSource(config); + } + + initSucc = true; + } catch (Exception exception) { + logger.error(exception.getMessage()); + } + } + + if (!initSucc) { + throw new Exception("## DBDataSource init Fail！"); + } + } + + /** + * close + */ + public void close() { + datasource.close(); + } + + /** + * Execute update + * + * @param sql + * @return + */ + private int executeUpdate(String sql) { + int result = 0; + try { + if ((null == datasource) || (datasource.isClosed())) { + initDataSource(); + } + + Connection connection = datasource.getConnection(); + try { + PreparedStatement pstmt = connection.prepareStatement(sql); + try { + result = pstmt.executeUpdate(); + } catch (Exception executeUpdatEexception) { + logger.error("Exception :{}", executeUpdatEexception.getMessage()); + } finally { + if (pstmt != null) { + pstmt.close(); + } + } + } catch (Exception pstmtEexception) { + logger.error("Exception :{}", pstmtEexception.getMessage()); + } finally { + if (connection != null) { + connection.close(); + } + } + getConnectionFailTimes.set(0); + } catch (Exception e) { + getConnectionFailTimes.addAndGet(1); + logger.warn("## get Connection fail ..."); + } + return result; + } + + /** + * Leader selector + */ + public void leaderSelector() { + if (!electorConfig.isUseDefaultLeader()) { + try { + int result = executeUpdate(electorSql); + if (result == 2) { + logger.info(electorConfig.getLeaderId() + " get the leader"); + } else if (result == 1) { + logger.info(electorConfig.getLeaderId() + " do not get the leader"); + } + } catch (Exception wxception) { + logger.error("Exception: {} ,sql:{}", wxception.getMessage(), electorSql); + } + + } + } + + /** + * Replace leader + * + * @param replaceLeaderId + */ + public void replaceLeader(String replaceLeaderId) { + replaceLeaderSql = replaceLeaderSql.replaceAll("#", replaceLeaderId); + + try { + int result = executeUpdate(replaceLeaderSql); + if (result > 0) { + logger.info("## replace leader succ sql:" + replaceLeaderSql); + } else { + logger.warn("## replace leader fail sql:" + replaceLeaderSql); + } + + } catch (Exception exception) { + logger.error("Exception :{} ", exception.getMessage()); + } + } + + /** + * Release leader + */ + public void releaseLeader() { + try { + int result = executeUpdate(reLeaseSql); + logger.info("ReleaseLeader sql:" + reLeaseSql); + if (result == 1) { + logger.info(electorConfig.getLeaderId() + " release the leader success"); + } + } catch (Exception exception) { + logger.error("Exception {}:,sql:{}", exception.getMessage(), reLeaseSql); + } + + } + + /** + * Get current leader + * + * @return + */ + public String getCurrentLeader() { + if (electorConfig.isUseDefaultLeader()) { + return electorConfig.getDefaultLeaderId(); + } else { + String leaderId = ""; + + try { + if (null == datasource || datasource.isClosed()) { + logger.warn("## dataSource is closed init is again"); + initDataSource(); + } + Connection connection = datasource.getConnection(); + try { + PreparedStatement pstmt = connection.prepareStatement(searchCurrentLeaderSql); + try { + ResultSet resultSet = pstmt.executeQuery(); + if (resultSet.next()) { + leaderId = resultSet.getString("leader"); + } + } catch (Exception exception) { + logger.error("Exception {}", exception.getMessage()); + } finally { + if (pstmt != null) { + pstmt.close(); + } + } + } catch (Throwable connectionException) { + logger.error("Exception {}", connectionException.getMessage()); + } finally { + if (connection != null) { + connection.close(); + } + } + } catch (Exception datasourceException) { + logger.error("Exception {}", datasourceException.getMessage()); + } + + return leaderId; + } + } + + /** + * Judge DB data source whether to closed + * + * @return + */ + public boolean isDBDataSourceClosed() { + if (this.datasource != null) { + try { + Connection con = datasource.getConnection(); + if (con != null) { + con.close(); + } + return false; + } catch (Exception exception) { + logger.error("Exception {}", exception.getMessage()); + return true; + } + } else { Review Comment: No need to use else here, since return false only when con.close() succcess -- This is an automated message from the Apache Git Service. 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