| /** |
| * 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.master; |
| |
| import java.io.IOException; |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.List; |
| import java.util.Set; |
| |
| import org.apache.hadoop.hbase.NamespaceDescriptor; |
| import org.apache.hadoop.hbase.NamespaceNotFoundException; |
| import org.apache.hadoop.hbase.ServiceNotRunningException; |
| import org.apache.hadoop.hbase.classification.InterfaceAudience; |
| import org.apache.hadoop.hbase.master.procedure.CreateNamespaceProcedure; |
| import org.apache.hadoop.hbase.master.procedure.DeleteNamespaceProcedure; |
| import org.apache.hadoop.hbase.master.procedure.MasterProcedureEnv; |
| import org.apache.hadoop.hbase.master.procedure.ModifyNamespaceProcedure; |
| import org.apache.hadoop.hbase.procedure2.Procedure; |
| import org.apache.hadoop.hbase.procedure2.ProcedureExecutor; |
| |
| @InterfaceAudience.Private |
| class ClusterSchemaServiceImpl implements ClusterSchemaService { |
| private boolean running = false; |
| private final TableNamespaceManager tableNamespaceManager; |
| private final MasterServices masterServices; |
| private final static List<NamespaceDescriptor> EMPTY_NAMESPACE_LIST = |
| Collections.unmodifiableList(new ArrayList<NamespaceDescriptor>(0)); |
| |
| ClusterSchemaServiceImpl(final MasterServices masterServices) { |
| this.masterServices = masterServices; |
| this.tableNamespaceManager = new TableNamespaceManager(masterServices); |
| } |
| |
| // All below are synchronized so consistent view on whether running or not. |
| |
| @Override |
| public synchronized boolean isRunning() { |
| return this.running; |
| } |
| |
| private synchronized void checkIsRunning() throws ServiceNotRunningException { |
| if (!isRunning()) throw new ServiceNotRunningException(); |
| } |
| |
| @Override |
| public synchronized void startAndWait() throws IOException { |
| if (isRunning()) throw new IllegalStateException("Already running; cannot double-start."); |
| // Set to running FIRST because tableNamespaceManager start uses this class to do namespace ops |
| this.running = true; |
| this.tableNamespaceManager.start(); |
| } |
| |
| @Override |
| public synchronized void stopAndWait() throws IOException { |
| checkIsRunning(); |
| // You can't stop tableNamespaceManager. |
| this.running = false; |
| } |
| |
| @Override |
| public TableNamespaceManager getTableNamespaceManager() { |
| return this.tableNamespaceManager; |
| } |
| |
| private long submitProcedure(final Procedure<?> procedure, long nonceGroup, |
| long nonce) |
| throws ServiceNotRunningException { |
| checkIsRunning(); |
| ProcedureExecutor<MasterProcedureEnv> pe = this.masterServices.getMasterProcedureExecutor(); |
| return pe.submitProcedure(procedure, nonceGroup, nonce); |
| } |
| |
| @Override |
| public long createNamespace(NamespaceDescriptor namespaceDescriptor, |
| long nonceGroup, long nonce) |
| throws IOException { |
| return submitProcedure(new CreateNamespaceProcedure( |
| this.masterServices.getMasterProcedureExecutor().getEnvironment(), namespaceDescriptor), |
| nonceGroup, nonce); |
| } |
| |
| @Override |
| public long modifyNamespace(NamespaceDescriptor namespaceDescriptor, |
| long nonceGroup, long nonce) |
| throws IOException { |
| return submitProcedure(new ModifyNamespaceProcedure( |
| this.masterServices.getMasterProcedureExecutor().getEnvironment(), namespaceDescriptor), |
| nonceGroup, nonce); |
| } |
| |
| @Override |
| public long deleteNamespace(String name, long nonceGroup, long nonce) |
| throws IOException { |
| return submitProcedure(new DeleteNamespaceProcedure( |
| this.masterServices.getMasterProcedureExecutor().getEnvironment(), name), |
| nonceGroup, nonce); |
| } |
| |
| @Override |
| public NamespaceDescriptor getNamespace(String name) throws IOException { |
| NamespaceDescriptor nsd = getTableNamespaceManager().get(name); |
| if (nsd == null) throw new NamespaceNotFoundException(name); |
| return nsd; |
| } |
| |
| @Override |
| public List<NamespaceDescriptor> getNamespaces() throws IOException { |
| checkIsRunning(); |
| Set<NamespaceDescriptor> set = getTableNamespaceManager().list(); |
| if (set == null || set.isEmpty()) return EMPTY_NAMESPACE_LIST; |
| List<NamespaceDescriptor> list = new ArrayList<NamespaceDescriptor>(set.size()); |
| list.addAll(set); |
| return Collections.unmodifiableList(list); |
| } |
| } |