[GitHub] [shardingsphere] TeslaCN commented on a change in pull request #15251: Add `SHOW RULES USED RESOURCE` syntax to DistSQL.

[GitBox <gi...@apache.org>]

TeslaCN commented on a change in pull request #15251:
URL: https://github.com/apache/shardingsphere/pull/15251#discussion_r800072948



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File path: shardingsphere-proxy/shardingsphere-proxy-backend/src/main/java/org/apache/shardingsphere/proxy/backend/text/distsql/rql/rule/RulesUsedResourceQueryResultSet.java
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@@ -0,0 +1,180 @@
+/*
+ * 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.shardingsphere.proxy.backend.text.distsql.rql.rule;
+
+import org.apache.shardingsphere.dbdiscovery.api.config.DatabaseDiscoveryRuleConfiguration;
+import org.apache.shardingsphere.distsql.parser.statement.rql.show.ShowRulesUsedResourceStatement;
+import org.apache.shardingsphere.encrypt.api.config.EncryptRuleConfiguration;
+import org.apache.shardingsphere.infra.config.RuleConfiguration;
+import org.apache.shardingsphere.infra.distsql.query.DistSQLResultSet;
+import org.apache.shardingsphere.infra.metadata.ShardingSphereMetaData;
+import org.apache.shardingsphere.readwritesplitting.api.ReadwriteSplittingRuleConfiguration;
+import org.apache.shardingsphere.shadow.api.config.ShadowRuleConfiguration;
+import org.apache.shardingsphere.shadow.api.config.datasource.ShadowDataSourceConfiguration;
+import org.apache.shardingsphere.sharding.api.config.ShardingRuleConfiguration;
+import org.apache.shardingsphere.sql.parser.sql.common.statement.SQLStatement;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * Result set for show rules used resource.
+ */
+public final class RulesUsedResourceQueryResultSet implements DistSQLResultSet {
+    
+    private static final String TYPE = ShowRulesUsedResourceStatement.class.getName();
+    
+    private static final String SHARDING = "sharding";
+    
+    private static final String READWRITE_SPLITTING = "readwrite_splitting";
+    
+    private static final String DB_DISCOVERY = "db_discovery";
+    
+    private static final String ENCRYPT = "encrypt";
+    
+    private static final String SHADOW = "shadow";
+    
+    private static final Map<String, Class<? extends RuleConfiguration>> FEATURE_MAP = new HashMap<>(5, 1);
+    
+    private Iterator<Collection<Object>> data;
+    
+    static {
+        FEATURE_MAP.put(SHARDING, ShardingRuleConfiguration.class);
+        FEATURE_MAP.put(READWRITE_SPLITTING, ReadwriteSplittingRuleConfiguration.class);
+        FEATURE_MAP.put(DB_DISCOVERY, DatabaseDiscoveryRuleConfiguration.class);
+        FEATURE_MAP.put(ENCRYPT, EncryptRuleConfiguration.class);
+        FEATURE_MAP.put(SHADOW, ShadowRuleConfiguration.class);
+    }
+    
+    @Override
+    public void init(final ShardingSphereMetaData metaData, final SQLStatement sqlStatement) {
+        List<Collection<Object>> result = new ArrayList<>();
+        ShowRulesUsedResourceStatement statement = (ShowRulesUsedResourceStatement) sqlStatement;
+        String resourceName = statement.getResourceName().get();
+        if (hasRulesConfig(metaData) && metaData.getResource().getDataSources().keySet().contains(resourceName)) {
+            getRulesConfig(metaData.getRuleMetaData().getConfigurations(), resourceName, result);
+        }
+        this.data = result.iterator();
+    }
+    
+    private void getRulesConfig(final Collection<RuleConfiguration> ruleConfigurations, final String resourceName, final List<Collection<Object>> result) {
+        ruleConfigurations.stream().forEach(each -> {
+            getRulesConfigForSharding(each, result);
+            getRulesConfigForReadwriteSplitting(each, resourceName, result);
+            getRulesConfigForDBDiscovery(each, resourceName, result);
+            getRulesConfigForEncrypt(each, result);
+            getRulesConfigForShadow(each, resourceName, result);
+        });
+    }
+    
+    private void getRulesConfigForSharding(final RuleConfiguration ruleConfig, final List<Collection<Object>> result) {
+        if (!(ruleConfig.getClass().getCanonicalName().equals(FEATURE_MAP.get(SHARDING).getCanonicalName()))) {

Review comment:
       Why not use `getName()`?




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