/*
 * 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.phoenix.end2end.join;

import static org.apache.phoenix.util.TestUtil.TEST_PROPERTIES;
import static org.junit.Assert.fail;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.ArrayList;
import java.util.List;
import java.util.Properties;
import java.util.Random;
import org.apache.hadoop.hbase.client.Scan;
import org.apache.hadoop.hbase.coprocessor.ObserverContext;
import org.apache.hadoop.hbase.coprocessor.RegionCoprocessorEnvironment;
import org.apache.hadoop.hbase.coprocessor.SimpleRegionObserver;
import org.apache.phoenix.cache.GlobalCache;
import org.apache.phoenix.cache.TenantCache;
import org.apache.phoenix.coprocessorclient.HashJoinCacheNotFoundException;
import org.apache.phoenix.end2end.NeedsOwnMiniClusterTest;
import org.apache.phoenix.hbase.index.util.ImmutableBytesPtr;
import org.apache.phoenix.join.HashJoinInfo;
import org.apache.phoenix.query.QueryServices;
import org.apache.phoenix.util.ByteUtil;
import org.apache.phoenix.util.PropertiesUtil;
import org.apache.phoenix.util.SchemaUtil;
import org.apache.phoenix.util.TestUtil;
import org.junit.Test;
import org.junit.experimental.categories.Category;

@Category(NeedsOwnMiniClusterTest.class)
public class HashJoinCacheIT extends BaseJoinIT {

  @Override
  protected String getTableName(Connection conn, String virtualName) throws Exception {
    String realName = super.getTableName(conn, virtualName);
    TestUtil.addCoprocessor(conn, SchemaUtil.normalizeFullTableName(realName),
      InvalidateHashCache.class);
    return realName;
  }

  @Test(expected = HashJoinCacheNotFoundException.class)
  public void testExpiredCache() throws Exception {
    Properties props = PropertiesUtil.deepCopy(TEST_PROPERTIES);
    props.setProperty(QueryServices.MAX_SERVER_CACHE_TIME_TO_LIVE_MS_ATTRIB, "1");
    PreparedStatement statement = null;
    ResultSet rs = null;
    try (Connection conn = DriverManager.getConnection(getUrl(), props)) {
      String tableName1 = getTableName(conn, JOIN_SUPPLIER_TABLE_FULL_NAME);
      String tableName2 = getTableName(conn, JOIN_ITEM_TABLE_FULL_NAME);
      String query = "SELECT item.\"item_id\", item.name, supp.\"supplier_id\", supp.name FROM "
        + tableName1 + " supp RIGHT JOIN " + tableName2
        + " item ON item.\"supplier_id\" = supp.\"supplier_id\" ORDER BY \"item_id\"";
      statement = conn.prepareStatement(query);
      rs = statement.executeQuery();
      rs.next();
      // should not reach here
      fail("HashJoinCacheNotFoundException was not thrown or incorrectly handled");
    } finally {
      if (statement != null) {
        statement.close();
      }
      if (rs != null) {
        rs.close();
      }
    }
  }

  public static class InvalidateHashCache extends SimpleRegionObserver {
    public static Random rand = new Random();
    public static List<ImmutableBytesPtr> lastRemovedJoinIds = new ArrayList<ImmutableBytesPtr>();

    @Override
    public void preScannerOpen(final ObserverContext<RegionCoprocessorEnvironment> c,
      final Scan scan) {
      final HashJoinInfo joinInfo = HashJoinInfo.deserializeHashJoinFromScan(scan);
      if (joinInfo != null) {
        TenantCache cache = GlobalCache.getTenantCache(c.getEnvironment(), null);
        int count = joinInfo.getJoinIds().length;
        for (int i = 0; i < count; i++) {
          ImmutableBytesPtr joinId = joinInfo.getJoinIds()[i];
          if (!ByteUtil.contains(lastRemovedJoinIds, joinId)) {
            lastRemovedJoinIds.add(joinId);
            cache.removeServerCache(joinId);
          }
        }
      }
    }

  }

  @Test(expected = HashJoinCacheNotFoundException.class)
  public void testExpiredCacheWithLeftJoin() throws Exception {
    Properties props = PropertiesUtil.deepCopy(TEST_PROPERTIES);
    props.setProperty(QueryServices.MAX_SERVER_CACHE_TIME_TO_LIVE_MS_ATTRIB, "1");
    PreparedStatement statement = null;
    ResultSet rs = null;
    try (Connection conn = DriverManager.getConnection(getUrl(), props)) {
      String tableName1 = getTableName(conn, JOIN_SUPPLIER_TABLE_FULL_NAME);
      String tableName2 = getTableName(conn, JOIN_ITEM_TABLE_FULL_NAME);
      final String query =
        "SELECT item.\"item_id\", item.name, supp.\"supplier_id\", supp.name FROM " + tableName1
          + " supp LEFT JOIN " + tableName2
          + " item ON item.\"supplier_id\" = supp.\"supplier_id\" ORDER BY \"item_id\"";
      statement = conn.prepareStatement(query);
      rs = statement.executeQuery();
      rs.next();
      // should not reach here
      fail("HashJoinCacheNotFoundException was not thrown");
    } finally {
      if (statement != null) {
        statement.close();
      }
      if (rs != null) {
        rs.close();
      }
    }
  }

  @Test(expected = HashJoinCacheNotFoundException.class)
  public void testExpiredCacheWithInnerJoin() throws Exception {
    Properties props = PropertiesUtil.deepCopy(TEST_PROPERTIES);
    props.setProperty(QueryServices.MAX_SERVER_CACHE_TIME_TO_LIVE_MS_ATTRIB, "1");
    PreparedStatement statement = null;
    ResultSet rs = null;
    try (Connection conn = DriverManager.getConnection(getUrl(), props)) {
      String tableName1 = getTableName(conn, JOIN_SUPPLIER_TABLE_FULL_NAME);
      String tableName2 = getTableName(conn, JOIN_ITEM_TABLE_FULL_NAME);
      final String query =
        "SELECT item.\"item_id\", item.name, supp.\"supplier_id\", supp.name FROM " + tableName1
          + " supp INNER JOIN " + tableName2
          + " item ON item.\"supplier_id\" = supp.\"supplier_id\" ORDER BY \"item_id\"";
      statement = conn.prepareStatement(query);
      rs = statement.executeQuery();
      rs.next();
      // should not reach here
      fail("HashJoinCacheNotFoundException was not thrown as expected");
    } finally {
      if (statement != null) {
        statement.close();
      }
      if (rs != null) {
        rs.close();
      }
    }
  }

}
