/**
    * 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.hbase.client;
  
  import org.apache.hadoop.conf.Configuration;
  import org.apache.hadoop.hbase.HRegionInfo;
  import org.apache.hadoop.hbase.HRegionLocation;
  import org.apache.hadoop.hbase.RegionLocations;
  import org.apache.hadoop.hbase.ServerName;
  import org.apache.hadoop.hbase.TableName;
  import org.apache.hadoop.hbase.ipc.RpcControllerFactory;
  import org.apache.hadoop.hbase.testclassification.ClientTests;
  import org.apache.hadoop.hbase.testclassification.SmallTests;
  import org.apache.hadoop.hbase.util.Bytes;
  import org.junit.Before;
  import org.junit.Test;
  import org.junit.experimental.categories.Category;
  import org.junit.runner.RunWith;
  import org.mockito.Mock;
  import org.mockito.Mockito;
  import org.mockito.runners.MockitoJUnitRunner;
  
  @RunWith(MockitoJUnitRunner.class)
  @Category({ ClientTests.class, SmallTests.class })
  public class TestReversedScannerCallable {
  
    @Mock
    private ClusterConnection connection;
    @Mock
    private Scan scan;
    @Mock
    private RpcControllerFactory rpcFactory;
    @Mock
    private RegionLocations regionLocations;
  
    private final byte[] ROW = Bytes.toBytes("row1");
  
    @Before
    public void setUp() throws Exception {
      byte[] ROW_BEFORE = ConnectionUtils.createCloseRowBefore(ROW);
  
      Configuration conf = Mockito.mock(Configuration.class);
      HRegionLocation regionLocation = Mockito.mock(HRegionLocation.class);
      ServerName serverName = Mockito.mock(ServerName.class);
      HRegionInfo regionInfo = Mockito.mock(HRegionInfo.class);
  
      Mockito.when(connection.getConfiguration()).thenReturn(conf);
      Mockito.when(regionLocations.size()).thenReturn(1);
      Mockito.when(regionLocations.getRegionLocation(0)).thenReturn(regionLocation);
      Mockito.when(regionLocation.getHostname()).thenReturn("localhost");
      Mockito.when(regionLocation.getRegionInfo()).thenReturn(regionInfo);
      Mockito.when(regionLocation.getServerName()).thenReturn(serverName);
      Mockito.when(regionInfo.containsRow(ROW_BEFORE)).thenReturn(true);
      Mockito.when(scan.includeStartRow()).thenReturn(true);
      Mockito.when(scan.getStartRow()).thenReturn(ROW);
    }
  
    @Test
    public void testPrepareDoesNotUseCache() throws Exception {
      TableName tableName = TableName.valueOf("MyTable");
      Mockito.when(connection.relocateRegion(tableName, ROW, 0)).thenReturn(regionLocations);
  
      ReversedScannerCallable callable =
          new ReversedScannerCallable(connection, tableName, scan, null, rpcFactory);
      callable.prepare(true);
  
      Mockito.verify(connection).relocateRegion(tableName, ROW, 0);
    }
  
    @Test
    public void testPrepareUsesCache() throws Exception {
      TableName tableName = TableName.valueOf("MyTable");
      Mockito.when(connection.locateRegion(tableName, ROW, true, true, 0))
          .thenReturn(regionLocations);
  
      ReversedScannerCallable callable =
          new ReversedScannerCallable(connection, tableName, scan, null, rpcFactory);
      callable.prepare(false);
  
      Mockito.verify(connection).locateRegion(tableName, ROW, true, true, 0);
    }
  }