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;
019
020import java.io.IOException;
021import java.util.ArrayList;
022import java.util.Collections;
023import java.util.List;
024import java.util.Set;
025
026import org.apache.hadoop.hbase.NamespaceDescriptor;
027import org.apache.hadoop.hbase.NamespaceNotFoundException;
028import org.apache.hadoop.hbase.ServiceNotRunningException;
029import org.apache.yetus.audience.InterfaceAudience;
030import org.apache.hadoop.hbase.master.procedure.CreateNamespaceProcedure;
031import org.apache.hadoop.hbase.master.procedure.DeleteNamespaceProcedure;
032import org.apache.hadoop.hbase.master.procedure.MasterProcedureEnv;
033import org.apache.hadoop.hbase.master.procedure.ModifyNamespaceProcedure;
034import org.apache.hadoop.hbase.master.procedure.ProcedurePrepareLatch;
035import org.apache.hadoop.hbase.procedure2.Procedure;
036import org.apache.hadoop.hbase.procedure2.ProcedureExecutor;
037import org.apache.hbase.thirdparty.com.google.common.util.concurrent.AbstractService;
038import org.apache.hadoop.hbase.util.NonceKey;
039
040@InterfaceAudience.Private
041class ClusterSchemaServiceImpl extends AbstractService implements ClusterSchemaService {
042  private final TableNamespaceManager tableNamespaceManager;
043  private final MasterServices masterServices;
044  private final static List<NamespaceDescriptor> EMPTY_NAMESPACE_LIST =
045    Collections.unmodifiableList(new ArrayList<NamespaceDescriptor>(0));
046
047  ClusterSchemaServiceImpl(final MasterServices masterServices) {
048    this.masterServices = masterServices;
049    this.tableNamespaceManager = new TableNamespaceManager(masterServices);
050  }
051
052  // All below are synchronized so consistent view on whether running or not.
053
054
055  private synchronized void checkIsRunning() throws ServiceNotRunningException {
056    if (!isRunning()) throw new ServiceNotRunningException();
057  }
058
059  @Override
060  public synchronized void doStart() {
061    try {
062      notifyStarted();
063      this.tableNamespaceManager.start();
064    } catch (IOException ioe) {
065      notifyFailed(ioe);
066    }
067  }
068
069  @Override
070  protected void doStop() {
071    // This is no stop for the table manager.
072    notifyStopped();
073    TableNamespaceManager tnsm = getTableNamespaceManager();
074    if (tnsm != null) {
075      tnsm.stop("Stopping");
076    }
077  }
078
079  @Override
080  public TableNamespaceManager getTableNamespaceManager() {
081    return this.tableNamespaceManager;
082  }
083
084  private long submitProcedure(final Procedure<MasterProcedureEnv> procedure,
085      final NonceKey nonceKey) throws ServiceNotRunningException {
086    checkIsRunning();
087    ProcedureExecutor<MasterProcedureEnv> pe = this.masterServices.getMasterProcedureExecutor();
088    return pe.submitProcedure(procedure, nonceKey);
089  }
090
091  @Override
092  public long createNamespace(NamespaceDescriptor namespaceDescriptor, final NonceKey nonceKey,
093      final ProcedurePrepareLatch latch)
094      throws IOException {
095    return submitProcedure(new CreateNamespaceProcedure(
096      this.masterServices.getMasterProcedureExecutor().getEnvironment(), namespaceDescriptor, latch),
097        nonceKey);
098  }
099
100  @Override
101  public long modifyNamespace(NamespaceDescriptor namespaceDescriptor, final NonceKey nonceKey,
102      final ProcedurePrepareLatch latch) throws IOException {
103    return submitProcedure(new ModifyNamespaceProcedure(
104      this.masterServices.getMasterProcedureExecutor().getEnvironment(), namespaceDescriptor, latch),
105        nonceKey);
106  }
107
108  @Override
109  public long deleteNamespace(String name, final NonceKey nonceKey, final ProcedurePrepareLatch latch)
110      throws IOException {
111    return submitProcedure(new DeleteNamespaceProcedure(
112      this.masterServices.getMasterProcedureExecutor().getEnvironment(), name, latch),
113      nonceKey);
114  }
115
116  @Override
117  public NamespaceDescriptor getNamespace(String name) throws IOException {
118    NamespaceDescriptor nsd = getTableNamespaceManager().get(name);
119    if (nsd == null) throw new NamespaceNotFoundException(name);
120    return nsd;
121  }
122
123  @Override
124  public List<NamespaceDescriptor> getNamespaces() throws IOException {
125    checkIsRunning();
126    Set<NamespaceDescriptor> set = getTableNamespaceManager().list();
127    if (set == null || set.isEmpty()) return EMPTY_NAMESPACE_LIST;
128    List<NamespaceDescriptor> list = new ArrayList<>(set.size());
129    list.addAll(set);
130    return Collections.unmodifiableList(list);
131  }
132}