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[SPARK-20420][SQL] Add events to the external catalog
## What changes were proposed in this pull request? It is often useful to be able to track changes to the `ExternalCatalog`. This PR makes the `ExternalCatalog` emit events when a catalog object is changed. Events are fired before and after the change. The following events are fired per object: - Database - CreateDatabasePreEvent: event fired before the database is created. - CreateDatabaseEvent: event fired after the database has been created. - DropDatabasePreEvent: event fired before the database is dropped. - DropDatabaseEvent: event fired after the database has been dropped. - Table - CreateTablePreEvent: event fired before the table is created. - CreateTableEvent: event fired after the table has been created. - RenameTablePreEvent: event fired before the table is renamed. - RenameTableEvent: event fired after the table has been renamed. - DropTablePreEvent: event fired before the table is dropped. - DropTableEvent: event fired after the table has been dropped. - Function - CreateFunctionPreEvent: event fired before the function is created. - CreateFunctionEvent: event fired after the function has been created. - RenameFunctionPreEvent: event fired before the function is renamed. - RenameFunctionEvent: event fired after the function has been renamed. - DropFunctionPreEvent: event fired before the function is dropped. - DropFunctionPreEvent: event fired after the function has been dropped. The current events currently only contain the names of the object modified. We add more events, and more details at a later point. A user can monitor changes to the external catalog by adding a listener to the Spark listener bus checking for `ExternalCatalogEvent`s using the `SparkListener.onOtherEvent` hook. A more direct approach is add listener directly to the `ExternalCatalog`. ## How was this patch tested? Added the `ExternalCatalogEventSuite`. Author: Herman van Hovell <[email protected]> Closes apache#17710 from hvanhovell/SPARK-20420.
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/catalog/events.scala
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| /* | ||
| * 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.spark.sql.catalyst.catalog | ||
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| import org.apache.spark.scheduler.SparkListenerEvent | ||
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| /** | ||
| * Event emitted by the external catalog when it is modified. Events are either fired before or | ||
| * after the modification (the event should document this). | ||
| */ | ||
| trait ExternalCatalogEvent extends SparkListenerEvent | ||
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| /** | ||
| * Listener interface for external catalog modification events. | ||
| */ | ||
| trait ExternalCatalogEventListener { | ||
| def onEvent(event: ExternalCatalogEvent): Unit | ||
| } | ||
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| /** | ||
| * Event fired when a database is create or dropped. | ||
| */ | ||
| trait DatabaseEvent extends ExternalCatalogEvent { | ||
| /** | ||
| * Database of the object that was touched. | ||
| */ | ||
| val database: String | ||
| } | ||
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| /** | ||
| * Event fired before a database is created. | ||
| */ | ||
| case class CreateDatabasePreEvent(database: String) extends DatabaseEvent | ||
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| /** | ||
| * Event fired after a database has been created. | ||
| */ | ||
| case class CreateDatabaseEvent(database: String) extends DatabaseEvent | ||
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| /** | ||
| * Event fired before a database is dropped. | ||
| */ | ||
| case class DropDatabasePreEvent(database: String) extends DatabaseEvent | ||
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| /** | ||
| * Event fired after a database has been dropped. | ||
| */ | ||
| case class DropDatabaseEvent(database: String) extends DatabaseEvent | ||
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| /** | ||
| * Event fired when a table is created, dropped or renamed. | ||
| */ | ||
| trait TableEvent extends DatabaseEvent { | ||
| /** | ||
| * Name of the table that was touched. | ||
| */ | ||
| val name: String | ||
| } | ||
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| /** | ||
| * Event fired before a table is created. | ||
| */ | ||
| case class CreateTablePreEvent(database: String, name: String) extends TableEvent | ||
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| /** | ||
| * Event fired after a table has been created. | ||
| */ | ||
| case class CreateTableEvent(database: String, name: String) extends TableEvent | ||
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| /** | ||
| * Event fired before a table is dropped. | ||
| */ | ||
| case class DropTablePreEvent(database: String, name: String) extends TableEvent | ||
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| /** | ||
| * Event fired after a table has been dropped. | ||
| */ | ||
| case class DropTableEvent(database: String, name: String) extends TableEvent | ||
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| /** | ||
| * Event fired before a table is renamed. | ||
| */ | ||
| case class RenameTablePreEvent( | ||
| database: String, | ||
| name: String, | ||
| newName: String) | ||
| extends TableEvent | ||
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| /** | ||
| * Event fired after a table has been renamed. | ||
| */ | ||
| case class RenameTableEvent( | ||
| database: String, | ||
| name: String, | ||
| newName: String) | ||
| extends TableEvent | ||
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| /** | ||
| * Event fired when a function is created, dropped or renamed. | ||
| */ | ||
| trait FunctionEvent extends DatabaseEvent { | ||
| /** | ||
| * Name of the function that was touched. | ||
| */ | ||
| val name: String | ||
| } | ||
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| /** | ||
| * Event fired before a function is created. | ||
| */ | ||
| case class CreateFunctionPreEvent(database: String, name: String) extends FunctionEvent | ||
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| /** | ||
| * Event fired after a function has been created. | ||
| */ | ||
| case class CreateFunctionEvent(database: String, name: String) extends FunctionEvent | ||
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| /** | ||
| * Event fired before a function is dropped. | ||
| */ | ||
| case class DropFunctionPreEvent(database: String, name: String) extends FunctionEvent | ||
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| /** | ||
| * Event fired after a function has been dropped. | ||
| */ | ||
| case class DropFunctionEvent(database: String, name: String) extends FunctionEvent | ||
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| /** | ||
| * Event fired before a function is renamed. | ||
| */ | ||
| case class RenameFunctionPreEvent( | ||
| database: String, | ||
| name: String, | ||
| newName: String) | ||
| extends FunctionEvent | ||
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| /** | ||
| * Event fired after a function has been renamed. | ||
| */ | ||
| case class RenameFunctionEvent( | ||
| database: String, | ||
| name: String, | ||
| newName: String) | ||
| extends FunctionEvent |
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