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.master.balancer;
019
020import java.io.IOException;
021import java.util.Collection;
022import java.util.Collections;
023import java.util.List;
024import java.util.Map;
025import java.util.function.Predicate;
026import java.util.function.Supplier;
027import org.apache.hadoop.conf.Configuration;
028import org.apache.hadoop.hbase.HDFSBlocksDistribution;
029import org.apache.hadoop.hbase.ServerMetrics;
030import org.apache.hadoop.hbase.ServerName;
031import org.apache.hadoop.hbase.TableName;
032import org.apache.hadoop.hbase.client.BalancerDecision;
033import org.apache.hadoop.hbase.client.BalancerRejection;
034import org.apache.hadoop.hbase.client.Connection;
035import org.apache.hadoop.hbase.client.RegionInfo;
036import org.apache.hadoop.hbase.client.TableDescriptor;
037
038public class DummyClusterInfoProvider implements ClusterInfoProvider {
039
040  private volatile Configuration conf;
041
042  public DummyClusterInfoProvider(Configuration conf) {
043    this.conf = conf;
044  }
045
046  @Override
047  public Configuration getConfiguration() {
048    return conf;
049  }
050
051  @Override
052  public Connection getConnection() {
053    return null;
054  }
055
056  @Override
057  public List<RegionInfo> getAssignedRegions() {
058    return Collections.emptyList();
059  }
060
061  @Override
062  public void unassign(RegionInfo regionInfo) throws IOException {
063  }
064
065  @Override
066  public TableDescriptor getTableDescriptor(TableName tableName) throws IOException {
067    return null;
068  }
069
070  @Override
071  public int getNumberOfTables() throws IOException {
072    return 0;
073  }
074
075  @Override
076  public HDFSBlocksDistribution computeHDFSBlocksDistribution(Configuration conf,
077    TableDescriptor tableDescriptor, RegionInfo regionInfo) throws IOException {
078    return new HDFSBlocksDistribution();
079  }
080
081  @Override
082  public boolean hasRegionReplica(Collection<RegionInfo> regions) throws IOException {
083    return false;
084  }
085
086  @Override
087  public List<ServerName> getOnlineServersList() {
088    return Collections.emptyList();
089  }
090
091  @Override
092  public List<ServerName> getOnlineServersListWithPredicator(List<ServerName> servers,
093    Predicate<ServerMetrics> filter) {
094    return Collections.emptyList();
095  }
096
097  @Override
098  public Map<ServerName, List<RegionInfo>> getSnapShotOfAssignment(Collection<RegionInfo> regions) {
099    return Collections.emptyMap();
100  }
101
102  @Override
103  public boolean isOffPeakHour() {
104    return false;
105  }
106
107  @Override
108  public void recordBalancerDecision(Supplier<BalancerDecision> decision) {
109  }
110
111  @Override
112  public void recordBalancerRejection(Supplier<BalancerRejection> rejection) {
113  }
114
115  @Override
116  public void onConfigurationChange(Configuration conf) {
117    this.conf = conf;
118  }
119
120  @Override
121  public ServerMetrics getLoad(ServerName serverName) {
122    return null;
123  }
124}