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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.DatabaseRuleAlterExecutor;
23  import org.apache.shardingsphere.distsql.statement.rdl.rule.database.DatabaseRuleDefinitionStatement;
24  import org.apache.shardingsphere.infra.config.rule.RuleConfiguration;
25  import org.apache.shardingsphere.infra.config.rule.decorator.RuleConfigurationDecorator;
26  import org.apache.shardingsphere.infra.instance.mode.ModeContextManager;
27  import org.apache.shardingsphere.infra.metadata.database.ShardingSphereDatabase;
28  import org.apache.shardingsphere.infra.metadata.version.MetaDataVersion;
29  import org.apache.shardingsphere.infra.spi.type.typed.TypedSPILoader;
30  import org.apache.shardingsphere.mode.manager.ContextManager;
31  
32  import java.util.Collection;
33  import java.util.LinkedHashMap;
34  import java.util.Map.Entry;
35  import java.util.stream.Collectors;
36  
37  /**
38   * Alter database rule operator.
39   */
40  @RequiredArgsConstructor
41  public final class AlterDatabaseRuleOperator implements DatabaseRuleOperator {
42      
43      private final ContextManager contextManager;
44      
45      @SuppressWarnings("rawtypes")
46      private final DatabaseRuleAlterExecutor executor;
47      
48      @Override
49      @SuppressWarnings("unchecked")
50      public Collection<MetaDataVersion> operate(final DatabaseRuleDefinitionStatement sqlStatement, final ShardingSphereDatabase database, final RuleConfiguration currentRuleConfig) {
51          RuleConfiguration toBeAlteredRuleConfig = executor.buildToBeAlteredRuleConfiguration(sqlStatement);
52          ModeContextManager modeContextManager = contextManager.getInstanceContext().getModeContextManager();
53          RuleConfiguration toBeDroppedRuleConfig = executor.buildToBeDroppedRuleConfiguration(toBeAlteredRuleConfig);
54          modeContextManager.removeRuleConfigurationItem(database.getName(), toBeDroppedRuleConfig);
55          return modeContextManager.alterRuleConfiguration(database.getName(), decorateRuleConfiguration(database, toBeAlteredRuleConfig));
56      }
57      
58      @SuppressWarnings("unchecked")
59      private RuleConfiguration decorateRuleConfiguration(final ShardingSphereDatabase database, final RuleConfiguration ruleConfig) {
60          return TypedSPILoader.findService(RuleConfigurationDecorator.class, ruleConfig.getClass()).map(optional -> optional.decorate(database.getName(),
61                  database.getResourceMetaData().getStorageUnits().entrySet().stream()
62                          .collect(Collectors.toMap(Entry::getKey, entry -> entry.getValue().getDataSource(), (oldValue, currentValue) -> oldValue, LinkedHashMap::new)),
63                  database.getRuleMetaData().getRules(), ruleConfig)).orElse(ruleConfig);
64      }
65  }