Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/3406#discussion_r105703538
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/catalog/InMemoryExternalCatalog.scala
---
@@ -0,0 +1,155 @@
+/*
+ * 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.api.{DatabaseAlreadyExistException,
DatabaseNotExistException, TableAlreadyExistException, TableNotExistException}
+import java.util.{List => JList}
+
+import scala.collection.mutable.HashMap
+import scala.collection.JavaConverters._
+
+/**
+ * This class is an in-memory implementation of
[[ReadonlyExternalCatalog]].
+ *
+ * It could be used for testing or developing instead of used in
production environment.
+ */
+class InMemoryExternalCatalog extends CRUDExternalCatalog {
+
+ private val databases = new HashMap[String, Database]
+
+ @throws[DatabaseNotExistException]
+ @throws[TableAlreadyExistException]
+ override def createTable(
+ table: ExternalCatalogTable,
+ ignoreIfExists: Boolean): Unit = synchronized {
+ val dbName = table.identifier.database
+ val tables = getTables(dbName)
+ val tableName = table.identifier.table
+ if (tables.contains(tableName)) {
+ if (!ignoreIfExists) {
+ throw new TableAlreadyExistException(dbName, tableName)
+ }
+ } else {
+ tables.put(tableName, table)
+ }
+ }
+
+ @throws[DatabaseNotExistException]
+ @throws[TableNotExistException]
+ override def dropTable(
+ dbName: String,
+ tableName: String,
+ ignoreIfNotExists: Boolean): Unit = synchronized {
+ val tables = getTables(dbName)
+ if (tables.remove(tableName).isEmpty && !ignoreIfNotExists) {
+ throw new TableNotExistException(dbName, tableName)
+ }
+ }
+
+ @throws[DatabaseNotExistException]
+ @throws[TableNotExistException]
+ override def alterTable(
+ table: ExternalCatalogTable,
+ ignoreIfNotExists: Boolean): Unit = synchronized {
+ val dbName = table.identifier.database
+ val tables = getTables(dbName)
+ val tableName = table.identifier.table
+ if (tables.contains(tableName)) {
+ tables.put(tableName, table)
+ } else if (!ignoreIfNotExists) {
+ throw new TableNotExistException(dbName, tableName)
+ }
+ }
+
+ @throws[DatabaseNotExistException]
+ override def listTables(dbName: String): JList[String] = synchronized {
+ val tables = getTables(dbName)
+ tables.keys.toList.asJava
+ }
+
+ @throws[DatabaseNotExistException]
+ @throws[TableNotExistException]
+ override def getTable(dbName: String, tableName: String):
ExternalCatalogTable = synchronized {
+ val tables = getTables(dbName)
+ tables.get(tableName) match {
+ case Some(table) => table
+ case None => throw new TableNotExistException(dbName, tableName)
+ }
+ }
+
+ @throws[DatabaseAlreadyExistException]
+ override def createDatabase(
+ db: ExternalCatalogDatabase,
+ ignoreIfExists: Boolean): Unit = synchronized {
+ val dbName = db.dbName
+ if (databases.contains(dbName)) {
+ if (!ignoreIfExists) {
+ throw new DatabaseAlreadyExistException(dbName)
+ }
+ } else {
+ databases.put(dbName, new Database(db))
+ }
+ }
+
+ @throws[DatabaseNotExistException]
+ override def alterDatabase(
+ db: ExternalCatalogDatabase,
+ ignoreIfNotExists: Boolean): Unit = synchronized {
+ val dbName = db.dbName
+ databases.get(dbName) match {
+ case Some(database) => database.db = db
+ case None =>
+ if (!ignoreIfNotExists) {
+ throw new DatabaseNotExistException(dbName)
+ }
+ }
+ }
+
+ @throws[DatabaseNotExistException]
+ override def dropDatabase(
+ dbName: String,
+ ignoreIfNotExists: Boolean): Unit = synchronized {
+ if (databases.remove(dbName).isEmpty && !ignoreIfNotExists) {
+ throw new DatabaseNotExistException(dbName)
+ }
+ }
+
+ override def listDatabases(): JList[String] = synchronized {
+ databases.keys.toList.asJava
+ }
+
+ @throws[DatabaseNotExistException]
+ override def getDatabase(dbName: String): ExternalCatalogDatabase =
synchronized {
+ databases.get(dbName) match {
+ case Some(database) => database.db
+ case None => null
--- End diff --
throw `DatabaseNotExistException`
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