TeslaCN commented on a change in pull request #16106: URL: https://github.com/apache/shardingsphere/pull/16106#discussion_r826874485
########## File path: shardingsphere-features/shardingsphere-db-discovery/shardingsphere-db-discovery-provider/shardingsphere-db-discovery-mysql/src/main/java/org/apache/shardingsphere/dbdiscovery/mysql/ShowSlaveStatusDatabaseDiscoveryType.java ########## @@ -0,0 +1,158 @@ +/* + * 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.shardingsphere.dbdiscovery.mysql; + +import lombok.Getter; +import lombok.Setter; +import lombok.extern.slf4j.Slf4j; +import org.apache.shardingsphere.dbdiscovery.spi.DatabaseDiscoveryType; +import org.apache.shardingsphere.infra.eventbus.ShardingSphereEventBus; +import org.apache.shardingsphere.infra.rule.event.impl.DataSourceDisabledEvent; +import org.apache.shardingsphere.infra.rule.event.impl.PrimaryDataSourceChangedEvent; + +import javax.sql.DataSource; +import java.sql.Connection; +import java.sql.ResultSet; +import java.sql.SQLException; +import java.sql.Statement; +import java.util.Collection; +import java.util.HashMap; +import java.util.Map; +import java.util.Map.Entry; +import java.util.Properties; + +/** + * Show slave status database discovery type. + */ +@Slf4j +public final class ShowSlaveStatusDatabaseDiscoveryType implements DatabaseDiscoveryType { + + private static final String SHOW_SLAVE_STATUS = "SHOW SLAVE STATUS"; + + private String oldPrimaryDataSource; + + @Getter + @Setter + private Properties props = new Properties(); + + @Override + public void checkDatabaseDiscoveryConfiguration(final String schemaName, final Map<String, DataSource> dataSourceMap) { + //TODO Check master-slave mode + } + + //TODO Consider merge MGR 's get primary datasource method + @Override + public void updatePrimaryDataSource(final String schemaName, final Map<String, DataSource> dataSourceMap, final Collection<String> disabledDataSourceNames, final String groupName) { + Map<String, DataSource> activeDataSourceMap = new HashMap<>(dataSourceMap); + if (!disabledDataSourceNames.isEmpty()) { + activeDataSourceMap.entrySet().removeIf(each -> disabledDataSourceNames.contains(each.getKey())); + } + String primaryDatasource = determinePrimaryDataSource(activeDataSourceMap); + if (primaryDatasource.isEmpty()) { + return; + } + if (!primaryDatasource.equals(oldPrimaryDataSource)) { + oldPrimaryDataSource = primaryDatasource; + ShardingSphereEventBus.getInstance().post(new PrimaryDataSourceChangedEvent(schemaName, groupName, primaryDatasource)); + } + } + + //TODO Consider merge MGR 's get primary datasource method + private String determinePrimaryDataSource(final Map<String, DataSource> dataSourceMap) { + String primaryDataSourceURL = findPrimaryDataSourceURL(dataSourceMap); + return findPrimaryDataSourceName(primaryDataSourceURL, dataSourceMap); + } + + //TODO Consider merge MGR 's get primary datasource method + private String findPrimaryDataSourceURL(final Map<String, DataSource> dataSourceMap) { + for (Entry<String, DataSource> entry : dataSourceMap.entrySet()) { + try (Connection connection = entry.getValue().getConnection(); + Statement statement = connection.createStatement()) { + ResultSet resultSet = statement.executeQuery(SHOW_SLAVE_STATUS); Review comment: The ResultSet is not closed. -- 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. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
