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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *     http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  
18  package org.apache.shardingsphere.distsql.handler.engine.update.rdl.rule.engine.database.type;
19  
20  import lombok.RequiredArgsConstructor;
21  import org.apache.shardingsphere.distsql.handler.engine.update.rdl.rule.engine.database.DatabaseRuleOperator;
22  import org.apache.shardingsphere.distsql.handler.engine.update.rdl.rule.spi.database.type.DatabaseRuleAlterExecutor;
23  import org.apache.shardingsphere.distsql.statement.type.rdl.rule.database.DatabaseRuleDefinitionStatement;
24  import org.apache.shardingsphere.infra.config.rule.RuleConfiguration;
25  import org.apache.shardingsphere.infra.config.rule.checker.DatabaseRuleConfigurationEmptyChecker;
26  import org.apache.shardingsphere.infra.config.rule.scope.DatabaseRuleConfiguration;
27  import org.apache.shardingsphere.infra.metadata.database.ShardingSphereDatabase;
28  import org.apache.shardingsphere.infra.spi.type.typed.TypedSPILoader;
29  import org.apache.shardingsphere.mode.manager.ContextManager;
30  import org.apache.shardingsphere.mode.persist.service.MetaDataManagerPersistService;
31  
32  /**
33   * Alter database rule operator.
34   */
35  @RequiredArgsConstructor
36  public final class AlterDatabaseRuleOperator implements DatabaseRuleOperator {
37      
38      private final ContextManager contextManager;
39      
40      @SuppressWarnings("rawtypes")
41      private final DatabaseRuleAlterExecutor executor;
42      
43      @Override
44      @SuppressWarnings("unchecked")
45      public void operate(final DatabaseRuleDefinitionStatement sqlStatement, final ShardingSphereDatabase database, final RuleConfiguration currentRuleConfig) {
46          RuleConfiguration toBeAlteredRuleConfig = executor.buildToBeAlteredRuleConfiguration(sqlStatement);
47          MetaDataManagerPersistService metaDataManagerPersistService = contextManager.getPersistServiceFacade().getModeFacade().getMetaDataManagerService();
48          metaDataManagerPersistService.alterRuleConfiguration(database, database.decorateRuleConfiguration(toBeAlteredRuleConfig));
49          RuleConfiguration toBeDroppedRuleConfig = executor.buildToBeDroppedRuleConfiguration(toBeAlteredRuleConfig);
50          if (null != toBeDroppedRuleConfig
51                  && !TypedSPILoader.getService(DatabaseRuleConfigurationEmptyChecker.class, toBeAlteredRuleConfig.getClass()).isEmpty((DatabaseRuleConfiguration) toBeDroppedRuleConfig)) {
52              metaDataManagerPersistService.removeRuleConfigurationItem(database, toBeDroppedRuleConfig);
53          }
54      }
55  }