Java tutorial
/* * Copyright 2016 Ignacio del Valle Alles idelvall@brutusin.org. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.brutusin.rpc; import java.util.logging.Logger; import javax.servlet.FilterRegistration; import javax.servlet.HttpConstraintElement; import javax.servlet.ServletContext; import javax.servlet.ServletContextAttributeEvent; import javax.servlet.ServletContextAttributeListener; import javax.servlet.ServletContextEvent; import javax.servlet.ServletContextListener; import javax.servlet.ServletException; import javax.servlet.ServletRegistration; import javax.servlet.ServletRequestEvent; import javax.servlet.ServletRequestListener; import javax.servlet.ServletSecurityElement; import javax.servlet.http.HttpServletRequest; import javax.websocket.DeploymentException; import javax.websocket.server.ServerContainer; import javax.websocket.server.ServerEndpointConfig; import org.brutusin.commons.Bean; import org.brutusin.commons.io.MetaDataInputStream; import org.brutusin.json.spi.JsonCodec; import org.brutusin.rpc.http.RpcServlet; import org.brutusin.rpc.websocket.WebsocketEndpoint; import org.brutusin.rpc.websocket.WebsocketEndpointConfigurator; import org.brutusin.rpc.websocket.WebsocketFilter; import org.springframework.core.annotation.Order; import org.springframework.security.web.FilterChainProxy; import org.springframework.web.WebApplicationInitializer; import org.springframework.web.context.WebApplicationContext; import org.springframework.web.context.support.WebApplicationContextUtils; /** * * @author Ignacio del Valle Alles idelvall@brutusin.org */ @Order(1) public class RpcWebInitializer implements WebApplicationInitializer { private static final Logger LOGGER = Logger.getLogger(RpcWebInitializer.class.getName()); 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(); } 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()); } } } }); } private RpcSpringContext createRpcSpringContext(ServletContext ctx) { ServerContainer sc = (ServerContainer) ctx.getAttribute("javax.websocket.server.ServerContainer"); if (sc == null) { throw new Error("ServerContainer not found"); } RpcSpringContext rpcCtx = new RpcSpringContext(sc, !RpcConfig.getInstance().isTestMode()); return rpcCtx; } private RpcServlet registerRpcServlet(ServletContext ctx) { LOGGER.info("Starting HTTP RPC runtime"); RpcServlet servlet = new RpcServlet(); ServletRegistration.Dynamic regInfo = ctx.addServlet(RpcServlet.class.getName(), servlet); ServletSecurityElement sec = new ServletSecurityElement(new HttpConstraintElement()); regInfo.setServletSecurity(sec); regInfo.setLoadOnStartup(1); regInfo.addMapping(RpcConfig.getInstance().getPath() + "/http"); return servlet; } private void initWebsocketRpcRuntime(final ServletContext ctx, final RpcSpringContext rpcCtx) { LOGGER.info("Starting Websocket RPC runtime"); ServerEndpointConfig.Configurator cfg = new WebsocketEndpointConfigurator(ctx, rpcCtx); ServerEndpointConfig sec = ServerEndpointConfig.Builder .create(WebsocketEndpoint.class, RpcConfig.getInstance().getPath() + "/wskt").configurator(cfg) .build(); try { rpcCtx.getWebsocketContainer().addEndpoint(sec); } catch (DeploymentException ex) { throw new RuntimeException(ex); } } }