[GitHub] [shardingsphere] hua74ni commented on pull request #26007: Fixed the reloadRules method that caused ruleMetaData.getRules() to be null briefly

["hua74ni (via GitHub)" <gi...@apache.org>]

hua74ni commented on PR #26007:
URL: https://github.com/apache/shardingsphere/pull/26007#issuecomment-1573207264

   Test cases
   
   ```
   @Test
   public void assertTest() throws InterruptedException {
   
       ShardingSphereRuleMetaData ruleMetaData = new ShardingSphereRuleMetaData(Collections.singleton(new ShardingSphereRuleFixture()));
   
       Thread thread = new Thread(new Runnable() {
           @Override
           public void run() {
               System.out.println("start cycle get ruleMetaData rules...");
               while (true) {
                   if (CollectionUtils.isEmpty(ruleMetaData.getRules())) {
                       System.out.println("ruleMetaData rules is null!!!!");
                   }
               }
           }
       });
       thread.setDaemon(true);
       thread.start();
   
       Thread.sleep(1000);
   
       boolean flag = false;
       System.out.println("start replace all ruleMetaData rules...");
       if (flag) {
           ((CopyOnWriteArrayList) ruleMetaData.getRules()).replaceAll(shardingSphereRule -> {
               return new ShardingSphereRuleFixture();
           });
       } else {
           ShardingSphereRuleMetaData newRuleMetaData = new ShardingSphereRuleMetaData(Collections.singleton(new ShardingSphereRuleFixture()));
           ruleMetaData.getRules().clear();
           ruleMetaData.getRules().addAll(newRuleMetaData.getRules());
       }
   
       System.out.println("finished replace all ruleMetaData rules...");
   
       Thread.sleep(3000);
   }
   ```


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