integration/spark/src/main/scala/org/apache/spark/sql/secondaryindex/events/DeleteSegmentByIdListener.scala

/*
 * 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.secondaryindex.events

import scala.collection.JavaConverters._

import org.apache.log4j.Logger
import org.apache.spark.internal.Logging
import org.apache.spark.sql.CarbonEnv
import org.apache.spark.sql.hive.CarbonRelation
import org.apache.spark.sql.index.CarbonIndexUtil

import org.apache.carbondata.api.CarbonStore
import org.apache.carbondata.common.logging.LogServiceFactory
import org.apache.carbondata.core.datastore.impl.FileFactory
import org.apache.carbondata.core.metadata.index.IndexType
import org.apache.carbondata.core.util.path.CarbonTablePath
import org.apache.carbondata.events.{DeleteSegmentByIdPostEvent, Event, OperationContext, OperationEventListener}

class DeleteSegmentByIdListener extends OperationEventListener with Logging {

  val LOGGER: Logger = LogServiceFactory.getLogService(this.getClass.getCanonicalName)

  /**
   * Called on a specified event occurrence
   *
   */
  override def onEvent(event: Event, operationContext: OperationContext): Unit = {
    event match {
      case deleteSegmentPostEvent: DeleteSegmentByIdPostEvent =>
        LOGGER.info("Delete segment By id post event listener called")
        val carbonTable = deleteSegmentPostEvent.carbonTable
        val loadIds = deleteSegmentPostEvent.loadIds
        val sparkSession = deleteSegmentPostEvent.sparkSession
        val siIndexesMap = carbonTable.getIndexesMap
          .get(IndexType.SI.getIndexProviderName)
        if (null != siIndexesMap) {
          siIndexesMap.keySet().asScala.foreach { tableName =>
            val metastore = CarbonEnv.getInstance(sparkSession).carbonMetaStore
            val table = metastore
              .lookupRelation(Some(carbonTable.getDatabaseName), tableName)(sparkSession)
              .asInstanceOf[CarbonRelation].carbonTable
            val tableStatusFilePath = CarbonTablePath.getTableStatusFilePath(table.getTablePath)
            // this check is added to verify if the table status file for the index table exists
            // or not. Delete on index tables is only to be called if the table status file exists.
            if (FileFactory.isFileExist(tableStatusFilePath)) {
              CarbonStore
                .deleteLoadById(loadIds, carbonTable.getDatabaseName, table.getTableName, table)
            }
          }
        }
    }
  }
}