spring boot啓動源碼分析 afterRefresh

 1     protected void afterRefresh(ConfigurableApplicationContext context,
 2             ApplicationArguments args) {
 3         callRunners(context, args);
 4     }
 5 
 6     private void callRunners(ApplicationContext context, ApplicationArguments args) {
 7         List<Object> runners = new ArrayList<Object>();
 8         runners.addAll(context.getBeansOfType(ApplicationRunner.class).values());
 9         runners.addAll(context.getBeansOfType(CommandLineRunner.class).values());
10         AnnotationAwareOrderComparator.sort(runners);
11         for (Object runner : new LinkedHashSet<Object>(runners)) {
12             if (runner instanceof ApplicationRunner) {
13                 callRunner((ApplicationRunner) runner, args);
14             }
15             if (runner instanceof CommandLineRunner) {
16                 callRunner((CommandLineRunner) runner, args);
17             }
18         }
19     }
20 
21     private void callRunner(ApplicationRunner runner, ApplicationArguments args) {
22         try {
23             (runner).run(args);
24         }
25         catch (Exception ex) {
26             throw new IllegalStateException("Failed to execute ApplicationRunner", ex);
27         }
28     }

上下文刷新結束後，能夠實現ApplicationRunner或者CommandLineRunner接口來實現上下文成功初始化後的一些操做。

最終調用

1 listeners.finished(context, null);

通知全部監聽器，上下文初始化結束。

 

applicationrunner commandlinerunner兩種runner除了參數類型不同，其餘的沒有區別，執行順序也是一塊兒排序使用order控制。使用的排序規則是AnnotationAwareOrderComparator。