Example usage for javax.servlet ServletContextAttributeListener ServletContextAttributeListener

Introduction

In this page you can find the example usage for javax.servlet ServletContextAttributeListener ServletContextAttributeListener.

Prototype

ServletContextAttributeListener

Source Link

Usage

From source file:org.brutusin.rpc.RpcWebInitializer.java

public void onStartup(final ServletContext ctx) throws ServletException {
    final RpcServlet rpcServlet = registerRpcServlet(ctx);
    final WebsocketFilter websocketFilter = new WebsocketFilter();
    FilterRegistration.Dynamic dynamic = ctx.addFilter(WebsocketFilter.class.getName(), websocketFilter);
    dynamic.addMappingForUrlPatterns(null, false, RpcConfig.getInstance().getPath() + "/wskt");
    JsonCodec.getInstance().registerStringFormat(MetaDataInputStream.class, "inputstream");
    final Bean<RpcSpringContext> rpcCtxBean = new Bean<RpcSpringContext>();
    ctx.addListener(new ServletRequestListener() {

        public void requestDestroyed(ServletRequestEvent sre) {
            GlobalThreadLocal.clear();//from  ww w. jav a2 s .  com
        }

        public void requestInitialized(ServletRequestEvent sre) {
            GlobalThreadLocal.set(new GlobalThreadLocal((HttpServletRequest) sre.getServletRequest(), null));
        }
    });
    ctx.addListener(new ServletContextListener() {

        public void contextInitialized(ServletContextEvent sce) {
            RpcSpringContext rpcCtx = createRpcSpringContext(ctx);
            rpcCtxBean.setValue(rpcCtx);
            rpcServlet.setRpcCtx(rpcCtx);
            initWebsocketRpcRuntime(ctx, rpcCtx);
            ctx.setAttribute(RpcSpringContext.class.getName(), rpcCtx);
        }

        public void contextDestroyed(ServletContextEvent sce) {
            LOGGER.info("Destroying RPC context");
            if (rpcCtxBean.getValue() != null) {
                rpcCtxBean.getValue().destroy();
            }
        }
    });
    ctx.addListener(new ServletContextAttributeListener() {
        public void attributeAdded(ServletContextAttributeEvent event) {
            if (event.getName().equals(WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE)) {
                updateRootContext();
            }
        }

        public void attributeRemoved(ServletContextAttributeEvent event) {
            if (event.getName().equals(WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE)) {
                updateRootContext();
            }
        }

        public void attributeReplaced(ServletContextAttributeEvent event) {
            if (event.getName().equals(WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE)) {
                updateRootContext();
            }
        }

        private void updateRootContext() {
            WebApplicationContext rootCtx = WebApplicationContextUtils.getWebApplicationContext(ctx);
            if (rootCtx != null) {
                if (rpcCtxBean.getValue() != null) {
                    rpcCtxBean.getValue().setParent(rootCtx);
                }
                if (rootCtx.containsBean("springSecurityFilterChain")) {
                    LOGGER.info("Moving WebsocketFilter behind springSecurityFilterChain");
                    websocketFilter.disable();
                    FilterChainProxy fcp = (FilterChainProxy) rootCtx.getBean("springSecurityFilterChain");
                    fcp.getFilterChains().get(0).getFilters().add(new WebsocketFilter());
                }
            }
        }
    });
}

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