strust2中是如何初始化container并且使其全局单例

strust2中是如何初始化container并且使其全局单例？

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StrutsPrepareAndExecuteFilter

?? protected PrepareOperations prepare;
??? protected ExecuteOperations execute;

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Dispatcher dispatcher = init.initDispatcher(config);

??? ? init()

????? Container container = init_PreloadConfiguration();

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?? private Container init_PreloadConfiguration() {
??????? Configuration config = configurationManager.getConfiguration();
??????? Container container = config.getContainer();

??????? boolean reloadi18n = Boolean.valueOf(container.getInstance(String.class, StrutsConstants.STRUTS_I18N_RELOAD));
??????? LocalizedTextUtil.setReloadBundles(reloadi18n);

??????? return container;
??? }

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???? ? Configuration config = configurationManager.getConfiguration();
??????? Container container = config.getContainer();

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? public synchronized Configuration getConfiguration() {
??????? if (configuration == null) {
??????????? setConfiguration(createConfiguration(defaultFrameworkBeanName));
??????????? try {
??????????????? configuration.reloadContainer(getContainerProviders());
??????????? } catch (ConfigurationException e) {
??????????????? setConfiguration(null);
??????????????? throw new ConfigurationException("Unable to load configuration.", e);
??????????? }
??????? } else {
??????????? conditionalReload(configuration.getContainer());
??????? }

??????? return configuration;
??? }

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?prepare = new PrepareOperations(filterConfig.getServletContext(), dispatcher);
?execute = new ExecuteOperations(filterConfig.getServletContext(), dispatcher);

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