xuefuz commented on a change in pull request #8007: [FLINK-11474][table] Add ReadableCatalog, ReadableWritableCatalog, and other … URL: https://github.com/apache/flink/pull/8007#discussion_r273261874
########## File path: flink-table/flink-table-common/src/main/java/org/apache/flink/table/catalog/GenericInMemoryCatalog.java ########## @@ -0,0 +1,263 @@ +/* + * 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.table.catalog; + +import org.apache.flink.table.catalog.exceptions.DatabaseAlreadyExistException; +import org.apache.flink.table.catalog.exceptions.DatabaseNotEmptyException; +import org.apache.flink.table.catalog.exceptions.DatabaseNotExistException; +import org.apache.flink.table.catalog.exceptions.TableAlreadyExistException; +import org.apache.flink.table.catalog.exceptions.TableNotExistException; +import org.apache.flink.util.Preconditions; +import org.apache.flink.util.StringUtils; + +import java.util.ArrayList; +import java.util.LinkedHashMap; +import java.util.List; +import java.util.Map; +import java.util.stream.Collectors; + +import static org.apache.flink.util.Preconditions.checkArgument; + +/** + * A generic catalog implementation that holds all meta objects in memory. + */ +public class GenericInMemoryCatalog implements ReadableWritableCatalog { + + public static final String DEFAULT_DB = "default"; + + private String defaultDatabaseName = DEFAULT_DB; + + private final String catalogName; + private final Map<String, CatalogDatabase> databases; + private final Map<ObjectPath, CommonTable> tables; + + public GenericInMemoryCatalog(String name) { + Preconditions.checkArgument(!StringUtils.isNullOrWhitespaceOnly(name), "name cannot be null or empty"); + + this.catalogName = name; + this.databases = new LinkedHashMap<>(); + this.databases.put(DEFAULT_DB, new GenericCatalogDatabase()); + this.tables = new LinkedHashMap<>(); + } + + @Override + public String getDefaultDatabaseName() { + return defaultDatabaseName; + } + + @Override + public void setDefaultDatabaseName(String databaseName) { + checkArgument(!StringUtils.isNullOrWhitespaceOnly(databaseName)); + + defaultDatabaseName = databaseName; + } + + @Override + public void open() { + + } + + @Override + public void close() { + + } + + // ------ databases ------ + + @Override + public void createDatabase(String databaseName, CatalogDatabase db, boolean ignoreIfExists) + throws DatabaseAlreadyExistException { + if (databaseExists(databaseName)) { + if (!ignoreIfExists) { + throw new DatabaseAlreadyExistException(catalogName, databaseName); + } + } else { + databases.put(databaseName, db.copy()); + } + } + + @Override + public void dropDatabase(String dbName, boolean ignoreIfNotExists) throws DatabaseNotExistException { + if (databases.containsKey(dbName)) { + + // Make sure the database is empty + if (isDatabaseEmpty(dbName)) { + databases.remove(dbName); + } else { + throw new DatabaseNotEmptyException(catalogName, dbName); + } + } else if (!ignoreIfNotExists) { + throw new DatabaseNotExistException(catalogName, dbName); + } + } + + private boolean isDatabaseEmpty(String databaseName) { + return tables.keySet().stream().noneMatch(op -> op.getDatabaseName().equals(databaseName)); + // TODO: also check function when function is added. + } + + @Override + public void alterDatabase(String databaseName, CatalogDatabase newDatabase, boolean ignoreIfNotExists) + throws DatabaseNotExistException { + if (databaseExists(databaseName)) { + databases.put(databaseName, newDatabase.copy()); + } else if (!ignoreIfNotExists) { + throw new DatabaseNotExistException(catalogName, databaseName); + } + } + + @Override + public List<String> listDatabases() { + return new ArrayList<>(databases.keySet()); + } + + @Override + public CatalogDatabase getDatabase(String databaseName) throws DatabaseNotExistException { + if (!databaseExists(databaseName)) { + throw new DatabaseNotExistException(catalogName, databaseName); + } else { + return databases.get(databaseName).copy(); + } + } + + @Override + public boolean databaseExists(String dbName) { + return databases.containsKey(dbName); + } + + // ------ tables ------ + + @Override + public void createTable(ObjectPath tablePath, CommonTable table, boolean ignoreIfExists) + throws TableAlreadyExistException, DatabaseNotExistException { + + if (!databaseExists(tablePath.getDatabaseName())) { + throw new DatabaseNotExistException(catalogName, tablePath.getDatabaseName()); + } + + if (tableExists(tablePath)) { + if (!ignoreIfExists) { + throw new TableAlreadyExistException(catalogName, tablePath); + } + } else { + tables.put(tablePath, table.copy()); + } + } + + @Override + public void alterTable(ObjectPath tablePath, CommonTable newTable, boolean ignoreIfNotExists) + throws TableNotExistException { + if (tableExists(tablePath)) { + tables.put(tablePath, newTable.copy()); + } else if (!ignoreIfNotExists) { + throw new TableNotExistException(catalogName, tablePath); + } + } + + @Override + public void renameTable(ObjectPath tablePath, String newTableName, boolean ignoreIfNotExists) + throws TableNotExistException, TableAlreadyExistException { + + if (tableExists(tablePath)) { + ObjectPath newPath = new ObjectPath(tablePath.getDatabaseName(), newTableName); + + if (tableExists(newPath)) { + throw new TableAlreadyExistException(catalogName, newPath); + } else { + tables.put(newPath, tables.remove(tablePath)); + } + } else if (!ignoreIfNotExists) { + throw new TableNotExistException(catalogName, tablePath); + } + } + + // ------ tables and views ------ + + @Override + public void dropTable(ObjectPath tablePath, boolean ignoreIfNotExists) throws TableNotExistException { + if (tableExists(tablePath)) { + tables.remove(tablePath); + } else if (!ignoreIfNotExists) { + throw new TableNotExistException(catalogName, tablePath); + } + } + + @Override + public List<String> listTables(String dbName) throws DatabaseNotExistException { + checkArgument(!StringUtils.isNullOrWhitespaceOnly(dbName), "dbName cannot be null or empty"); + + if (!databaseExists(dbName)) { + throw new DatabaseNotExistException(catalogName, dbName); + } + + return tables.keySet().stream() + .filter(k -> k.getDatabaseName().equals(dbName)).map(k -> k.getObjectName()) + .collect(Collectors.toList()); + } + + @Override + public CommonTable getTable(ObjectPath tableName) throws TableNotExistException { + + if (!tableExists(tableName)) { + throw new TableNotExistException(catalogName, tableName); + } else { + return tables.get(tableName).copy(); + } + } + + @Override + public boolean tableExists(ObjectPath tablePath) { + return databaseExists(tablePath.getDatabaseName()) && tables.containsKey(tablePath); + } + + // ------ views ------ + + @Override + public List<String> listViews(String databaseName) throws DatabaseNotExistException { + checkArgument(!StringUtils.isNullOrWhitespaceOnly(databaseName), "dbName cannot be null or empty"); + + if (!databaseExists(databaseName)) { + throw new DatabaseNotExistException(catalogName, databaseName); + } + + return tables.keySet().stream() + .filter(k -> k.getDatabaseName().equals(databaseName)) + .filter(k -> (tables.get(k) instanceof CatalogView)).map(k -> k.getObjectName()) + .collect(Collectors.toList()); + } + + @Override + public void createView(ObjectPath viewPath, CatalogView view, boolean ignoreIfExists) + throws TableAlreadyExistException, DatabaseNotExistException { + createTable(viewPath, view, ignoreIfExists); + } + + @Override + public void alterView(ObjectPath viewPath, CatalogView newView, boolean ignoreIfNotExists) + throws TableNotExistException { + alterTable(viewPath, newView, ignoreIfNotExists); + } + + @Override + public void renameView(ObjectPath viewPath, String newViewName, boolean ignoreIfNotExists) Review comment: Added ---------------------------------------------------------------- This is an automated message from the Apache Git Service. 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