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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.shadow.rule.changed;
19  
20  import org.apache.shardingsphere.infra.metadata.database.ShardingSphereDatabase;
21  import org.apache.shardingsphere.infra.util.yaml.YamlEngine;
22  import org.apache.shardingsphere.mode.spi.rule.RuleItemConfigurationChangedProcessor;
23  import org.apache.shardingsphere.mode.spi.rule.RuleChangedItemType;
24  import org.apache.shardingsphere.shadow.config.ShadowRuleConfiguration;
25  import org.apache.shardingsphere.shadow.config.datasource.ShadowDataSourceConfiguration;
26  import org.apache.shardingsphere.shadow.rule.ShadowRule;
27  import org.apache.shardingsphere.shadow.yaml.config.datasource.YamlShadowDataSourceConfiguration;
28  
29  /**
30   * Shadow data source changed processor.
31   */
32  public final class ShadowDataSourceChangedProcessor implements RuleItemConfigurationChangedProcessor<ShadowRuleConfiguration, ShadowDataSourceConfiguration> {
33      
34      @Override
35      public ShadowDataSourceConfiguration swapRuleItemConfiguration(final String itemName, final String yamlContent) {
36          YamlShadowDataSourceConfiguration yamlConfig = YamlEngine.unmarshal(yamlContent, YamlShadowDataSourceConfiguration.class);
37          return new ShadowDataSourceConfiguration(itemName, yamlConfig.getProductionDataSourceName(), yamlConfig.getShadowDataSourceName());
38      }
39      
40      @Override
41      public ShadowRuleConfiguration findRuleConfiguration(final ShardingSphereDatabase database) {
42          return database.getRuleMetaData().findSingleRule(ShadowRule.class).map(ShadowRule::getConfiguration).orElseGet(ShadowRuleConfiguration::new);
43      }
44      
45      @Override
46      public void changeRuleItemConfiguration(final String itemName, final ShadowRuleConfiguration currentRuleConfig, final ShadowDataSourceConfiguration toBeChangedItemConfig) {
47          // TODO refactor DistSQL to only persist config
48          currentRuleConfig.getDataSources().removeIf(each -> each.getName().equals(toBeChangedItemConfig.getName()));
49          currentRuleConfig.getDataSources().add(toBeChangedItemConfig);
50      }
51      
52      @Override
53      public void dropRuleItemConfiguration(final String itemName, final ShadowRuleConfiguration currentRuleConfig) {
54          currentRuleConfig.getDataSources().removeIf(each -> each.getName().equals(itemName));
55      }
56      
57      @Override
58      public RuleChangedItemType getType() {
59          return new RuleChangedItemType("shadow", "data_sources");
60      }
61  }