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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.hadoop.hive.hbase;

import java.io.IOException;
import java.util.ArrayList;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.client.Delete;
import org.apache.hadoop.hbase.client.HTable;
import org.apache.hadoop.hbase.client.Result;
import org.apache.hadoop.hbase.client.ResultScanner;
import org.apache.hadoop.hbase.client.Scan;
import org.apache.hadoop.hbase.filter.PrefixFilter;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.hive.ql.exec.Task;
import org.apache.hadoop.hive.ql.stats.StatsAggregator;


/**
 * A class that implements the StatsAggregator interface through HBase.
 */
public class HBaseStatsAggregator implements StatsAggregator {

  private HTable htable;
  private final Log LOG = LogFactory.getLog(this.getClass().getName());

  /**
   * Does the necessary HBase initializations.
   */
  public boolean connect(Configuration hiveconf, Task sourceTask) {

    try {
      htable = new HTable(HBaseConfiguration.create(hiveconf),
        HBaseStatsSetupConstants.PART_STAT_TABLE_NAME);

      return true;
    } catch (IOException e) {
      LOG.error("Error during HBase connection. ", e);
      return false;
    }
  }

  /**
   * Aggregates temporary stats from HBase;
   */
  public String aggregateStats(String rowID, String key) {

    byte[] family, column;
    if (!HBaseStatsUtils.isValidStatistic(key)) {
      LOG.warn("Warning. Invalid statistic: " + key + ", supported stats: " +
          HBaseStatsUtils.getSupportedStatistics());
      return null;
    }

    family = HBaseStatsUtils.getFamilyName();
    column = HBaseStatsUtils.getColumnName(key);

    try {

      long retValue = 0;
      Scan scan = new Scan();
      scan.addColumn(family, column);
      // Filter the row by its ID
      // The complete key is "tableName/PartSpecs/jobID/taskID"
      // This is a prefix filter, the prefix is "tableName/PartSpecs/JobID", i.e. the taskID is
      // ignored. In SQL, this is equivalent to
      // "Select * FROM tableName where ID LIKE 'tableName/PartSpecs/JobID%';"
      PrefixFilter filter = new PrefixFilter(Bytes.toBytes(rowID));
      scan.setFilter(filter);
      ResultScanner scanner = htable.getScanner(scan);

      for (Result result : scanner) {
        retValue += Long.parseLong(Bytes.toString(result.getValue(family, column)));
      }
      return Long.toString(retValue);
    } catch (IOException e) {
      LOG.error("Error during publishing aggregation. ", e);
      return null;
    }
  }

  public boolean closeConnection() {
    return true;
  }

  public boolean cleanUp(String rowID) {
    try {
      Scan scan = new Scan();
      // Filter the row by its ID
      // The complete key is "tableName/PartSpecs/jobID/taskID"
      // This is a prefix filter, the prefix is "JobID"
      // In SQL, this is equivalent to "Select * FROM tableName where ID LIKE 'JobID%';"
      PrefixFilter filter = new PrefixFilter(Bytes.toBytes(rowID));
      scan.setFilter(filter);
      ResultScanner scanner = htable.getScanner(scan);
      ArrayList toDelete = new ArrayList();
      for (Result result : scanner) {
        Delete delete = new Delete(result.getRow());
        toDelete.add(delete);
      }
      htable.delete(toDelete);
      return true;
    } catch (IOException e) {
      LOG.error("Error during publishing aggregation. ", e);
      return false;
    }
  }
}