究竟Spring在何时调用destroy-method="close" 这个方法close()呢?终于借助JavaEye找到了答案,原来如果Spring不在Web Container或是EJB Container中的时候,这个方法还是需要我们自己来调用的,具体就是调用BeanFactory的destroySingletons()方法,文档上的“自动调用”这几个字真是害我不浅呀,原来自动也是通过Web Container或是EJB Container才可以自动,具体做法就是要实现ServletContextListener这个接口,Spring中已经有具体的实现了:
public class ContextLoaderListener implements ServletContextListener {
private ContextLoader contextLoader;
/**
* Initialize the root web application context.
*/
public void contextInitialized(ServletContextEvent event) {
this.contextLoader = createContextLoader();
this.contextLoader.initWebApplicationContext(event.getServletContext());
}
/**
* Create the ContextLoader to use. Can be overridden in subclasses.
* @return the new ContextLoader
*/
protected ContextLoader createContextLoader() {
return new ContextLoader();
}
/**
* Return the ContextLoader used by this listener.
*/
public ContextLoader getContextLoader() {
return contextLoader;
}
/**
* Close the root web application context.
*/
public void contextDestroyed(ServletContextEvent event) {
this.contextLoader.closeWebApplicationContext(event.getServletContext());
}
}
当tomcat关闭的时候会自动调用contextDestroyed(ServletContextEvent event)这个方法。在看一下contextLoader的closeWebApplicationContext方法:
public void closeWebApplicationContext(ServletContext servletContext) throws ApplicationContextException {
servletContext.log("Closing root WebApplicationContext");
Object wac = servletContext.getAttribute(WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE);
if (wac instanceof ConfigurableApplicationContext) {
((ConfigurableApplicationContext) wac).close();
}
}
AbstractApplicationContext.Close这个方法是要你自己调用的,在程序要结束的时候保证调用这个close方法,在这里的话就是由Listener来保证tomcat退出的时候调用close方法。
AbstractApplicationContext.Close的代码 :
public void close() {
logger.info("Closing application context [" + getDisplayName() + "]");
// Destroy all cached singletons in this context,
// invoking DisposableBean.destroy and/or "destroy-method".
getBeanFactory().destroySingletons();
// publish corresponding event
publishEvent(new ContextClosedEvent(this));
}
最终还是调用到了getBeanFactory().destroySingletons(); 看来,没有容器,我们还是需要自己来搞定这个方法的调用的 !
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