| /* |
| * 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.iotdb.db.consensus; |
| |
| import org.apache.iotdb.common.rpc.thrift.TEndPoint; |
| import org.apache.iotdb.commons.consensus.SchemaRegionId; |
| import org.apache.iotdb.consensus.ConsensusFactory; |
| import org.apache.iotdb.consensus.IConsensus; |
| import org.apache.iotdb.consensus.config.ConsensusConfig; |
| import org.apache.iotdb.db.conf.IoTDBConfig; |
| import org.apache.iotdb.db.conf.IoTDBDescriptor; |
| import org.apache.iotdb.db.consensus.statemachine.SchemaRegionStateMachine; |
| import org.apache.iotdb.db.metadata.schemaregion.SchemaEngine; |
| |
| /** |
| * We can use SchemaRegionConsensusImpl.getInstance() to obtain a consensus layer reference for |
| * schemaRegion's reading and writing |
| */ |
| public class SchemaRegionConsensusImpl { |
| |
| private static final IoTDBConfig conf = IoTDBDescriptor.getInstance().getConfig(); |
| |
| private static IConsensus INSTANCE = null; |
| |
| private SchemaRegionConsensusImpl() {} |
| |
| // need to create instance before calling this method |
| public static IConsensus getInstance() { |
| return INSTANCE; |
| } |
| |
| public static synchronized IConsensus setupAndGetInstance() { |
| if (INSTANCE == null) { |
| INSTANCE = |
| ConsensusFactory.getConsensusImpl( |
| conf.getSchemaRegionConsensusProtocolClass(), |
| ConsensusConfig.newBuilder() |
| .setThisNode( |
| new TEndPoint( |
| conf.getInternalAddress(), conf.getSchemaRegionConsensusPort())) |
| .setStorageDir(conf.getSchemaRegionConsensusDir()) |
| .build(), |
| gid -> |
| new SchemaRegionStateMachine( |
| SchemaEngine.getInstance().getSchemaRegion((SchemaRegionId) gid))) |
| .orElseThrow( |
| () -> |
| new IllegalArgumentException( |
| String.format( |
| ConsensusFactory.CONSTRUCT_FAILED_MSG, |
| conf.getSchemaRegionConsensusProtocolClass()))); |
| } |
| return INSTANCE; |
| } |
| } |