jyothsnakonisa commented on code in PR #193: URL: https://github.com/apache/cassandra-sidecar/pull/193#discussion_r1980302587
########## server/src/main/java/org/apache/cassandra/sidecar/db/schema/ConfigsSchema.java: ########## @@ -0,0 +1,143 @@ +/* + * 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.cassandra.sidecar.db.schema; + +import com.datastax.driver.core.KeyspaceMetadata; +import com.datastax.driver.core.Metadata; +import com.datastax.driver.core.PreparedStatement; +import com.datastax.driver.core.Session; +import com.google.inject.Inject; +import com.google.inject.Singleton; +import org.apache.cassandra.sidecar.config.SchemaKeyspaceConfiguration; +import org.apache.cassandra.sidecar.config.ServiceConfiguration; +import org.apache.cassandra.sidecar.coordination.ExecuteOnClusterLeaseholderOnly; +import org.jetbrains.annotations.NotNull; + +/** + * {@link ConfigsSchema} holds all prepared statements needed for talking to Cassandra for various actions + * related to storing and updating CDC and Kafka configs. + */ +@Singleton +public class ConfigsSchema extends TableSchema implements ExecuteOnClusterLeaseholderOnly +{ + private static final String CONFIGS_TABLE_NAME = "configs"; + private final SchemaKeyspaceConfiguration keyspaceConfig; + + // prepared statements + private PreparedStatement selectConfig; + private PreparedStatement insertConfig; + private PreparedStatement insertConfigIfNotExist; + private PreparedStatement deleteConfig; + + @Inject + public ConfigsSchema(ServiceConfiguration configuration) + { + this.keyspaceConfig = configuration.schemaKeyspaceConfiguration(); + } + + @Override + protected String keyspaceName() + { + return keyspaceConfig.keyspace(); + } + + @Override + protected void prepareStatements(@NotNull Session session) + { + selectConfig = prepare(selectConfig, session, CqlLiterals.selectConfig(keyspaceConfig)); + insertConfig = prepare(insertConfig, session, CqlLiterals.insertConfig(keyspaceConfig)); + insertConfigIfNotExist = prepare(insertConfigIfNotExist, session, CqlLiterals.insertConfigIfNotExist(keyspaceConfig)); + deleteConfig = prepare(deleteConfig, session, CqlLiterals.deleteConfig(keyspaceConfig)); + } + + @Override + protected String tableName() + { + return CONFIGS_TABLE_NAME; + } + + @Override + protected boolean exists(@NotNull Metadata metadata) + { + KeyspaceMetadata ksMetadata = metadata.getKeyspace(keyspaceConfig.keyspace()); + if (ksMetadata == null) + return false; + return ksMetadata.getTable(CONFIGS_TABLE_NAME) != null; + } + + @Override + protected String createSchemaStatement() + { + return String.format("CREATE TABLE IF NOT EXISTS %s.%s (" + + " service text," + + " config map<text, text>," + + " PRIMARY KEY (service))", + keyspaceConfig.keyspace(), CONFIGS_TABLE_NAME); + } + + public PreparedStatement selectConfig() + { + return selectConfig; + } + + public PreparedStatement insertConfig() + { + return insertConfig; + } + + public PreparedStatement insertConfigIfNotExists() + { + return insertConfigIfNotExist; + } + + public PreparedStatement deleteConfig() + { + return deleteConfig; + } + + private static class CqlLiterals + { + static String selectConfig(SchemaKeyspaceConfiguration config) + { + return withTable("SELECT config from %s.%s" + + " WHERE service=?", config); + } + + static String insertConfig(SchemaKeyspaceConfiguration config) + { + return withTable("INSERT INTO %s.%s (service, config)" + + " VALUES (?, ?)", config); + } + + static String insertConfigIfNotExist(SchemaKeyspaceConfiguration config) Review Comment: We will need this for coming up patches -- 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: pr-unsubscr...@cassandra.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: pr-unsubscr...@cassandra.apache.org For additional commands, e-mail: pr-h...@cassandra.apache.org
