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//Prepare this context for refreshing.刷新前的预处理
prepareRefresh();
- 初始化一些属性设置
// Initialize any placeholder property sources in the context environment
initPropertySources();
注：此方法是空的，留给子方法实现
- 验证所欲的属性都是合法的
// Validate that all properties marked as required are resolvable
getEnvironment().validateRequiredProperties();
- 保存早期的事件，一旦多播器可用就会发布
// Allow for the collection of early ApplicationEvents,
// to be published once the multicaster is available...
this.earlyApplicationEvents = new LinkedHashSet<ApplicationEvent>();
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