Struts2 Core Developers Guide-DispatcherListener

1.主要功能
在Dispatcher对象init或者destroy的时候执行某些代码接口如下

  public void dispatcherInitialized(Dispatcher du) {
            // do something to Dispatcher after it is initialized eg.
            du.setConfigurationManager(....);
         }

         public void dispatcherDestroyed(Dispatcher du) {
            // do some cleanup after Dispatcher is destroyed.
         }
  }

源代码上看只有Dispatcher.init()方法中和WebLogic相关的部分有调用到DispatcherListener的dispatcherInitialized方法，所有感觉该接口不是那么重要的样子。

    private void init_CheckWebLogicWorkaround(Container container) {
        // test whether param-access workaround needs to be enabled
        if (servletContext != null && servletContext.getServerInfo() != null
                && servletContext.getServerInfo().indexOf("WebLogic") >= 0) {
            LOG.info("WebLogic server detected. Enabling Struts parameter access work-around.");
            paramsWorkaroundEnabled = true;
        } else {
            paramsWorkaroundEnabled = "true".equals(container.getInstance(String.class,
                    StrutsConstants.STRUTS_DISPATCHER_PARAMETERSWORKAROUND));
        }

        synchronized(Dispatcher.class) {
            if (dispatcherListeners.size() > 0) {
                for (DispatcherListener l : dispatcherListeners) {
                    l.dispatcherInitialized(this);
                }
            }
        }

}