001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.hadoop.hbase;
019
020import java.io.IOException;
021import java.util.ArrayList;
022import java.util.Collections;
023import java.util.List;
024import org.apache.hadoop.hbase.client.RegionInfo;
025import org.apache.hadoop.hbase.client.Result;
026import org.apache.hadoop.hbase.util.Bytes;
027
028/**
029 * Mocking utility for common hbase:meta functionality
030 */
031public class MetaMockingUtil {
032
033  /**
034   * Returns a Result object constructed from the given region information simulating a catalog
035   * table result.
036   * @param region the HRegionInfo object or null
037   * @return A mocked up Result that fakes a Get on a row in the <code>hbase:meta</code> table.
038   */
039  public static Result getMetaTableRowResult(final HRegionInfo region) throws IOException {
040    return getMetaTableRowResult(region, null, null, null);
041  }
042
043  /**
044   * Returns a Result object constructed from the given region information simulating a catalog
045   * table result.
046   * @param region the HRegionInfo object or null
047   * @param sn     to use making startcode and server hostname:port in meta or null
048   * @return A mocked up Result that fakes a Get on a row in the <code>hbase:meta</code> table.
049   */
050  public static Result getMetaTableRowResult(final HRegionInfo region, final ServerName sn)
051    throws IOException {
052    return getMetaTableRowResult(region, sn, null, null);
053  }
054
055  /**
056   * Returns a Result object constructed from the given region information simulating a catalog
057   * table result.
058   * @param region the HRegionInfo object or null
059   * @param sn     to use making startcode and server hostname:port in meta or null
060   * @param splita daughter region or null
061   * @param splitb daughter region or null
062   * @return A mocked up Result that fakes a Get on a row in the <code>hbase:meta</code> table.
063   */
064  public static Result getMetaTableRowResult(RegionInfo region, final ServerName sn,
065    RegionInfo splita, RegionInfo splitb) throws IOException {
066    List<Cell> kvs = new ArrayList<>();
067    if (region != null) {
068      kvs.add(new KeyValue(region.getRegionName(), HConstants.CATALOG_FAMILY,
069        HConstants.REGIONINFO_QUALIFIER, RegionInfo.toByteArray(region)));
070    }
071
072    if (sn != null) {
073      kvs.add(new KeyValue(region.getRegionName(), HConstants.CATALOG_FAMILY,
074        HConstants.SERVER_QUALIFIER, Bytes.toBytes(sn.getAddress().toString())));
075      kvs.add(new KeyValue(region.getRegionName(), HConstants.CATALOG_FAMILY,
076        HConstants.STARTCODE_QUALIFIER, Bytes.toBytes(sn.getStartcode())));
077    }
078
079    if (splita != null) {
080      kvs.add(new KeyValue(region.getRegionName(), HConstants.CATALOG_FAMILY,
081        HConstants.SPLITA_QUALIFIER, RegionInfo.toByteArray(splita)));
082    }
083
084    if (splitb != null) {
085      kvs.add(new KeyValue(region.getRegionName(), HConstants.CATALOG_FAMILY,
086        HConstants.SPLITB_QUALIFIER, RegionInfo.toByteArray(splitb)));
087    }
088
089    // important: sort the kvs so that binary search work
090    Collections.sort(kvs, MetaCellComparator.META_COMPARATOR);
091
092    return Result.create(kvs);
093  }
094
095}