| /******************************************************************************* |
| * Copyright (c) 2011, 2012 EclipseSource and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * EclipseSource - initial API and implementation |
| ******************************************************************************/ |
| package org.eclipse.rap.rwt.internal.application; |
| |
| import java.util.Collection; |
| import java.util.EnumSet; |
| |
| import javax.servlet.DispatcherType; |
| import javax.servlet.Filter; |
| import javax.servlet.FilterRegistration; |
| import javax.servlet.FilterRegistration.Dynamic; |
| import javax.servlet.ServletContext; |
| import javax.servlet.ServletRegistration; |
| |
| import org.eclipse.rap.rwt.engine.RWTServlet; |
| import org.eclipse.rap.rwt.internal.engine.RWTClusterSupport; |
| import org.eclipse.rap.rwt.internal.lifecycle.SimpleLifeCycle; |
| |
| /* |
| * This class requires the servlet 3.0 API to be on the class path. |
| */ |
| class SessionFailoverConfigurator { |
| private final ApplicationContextImpl applicationContext; |
| private final ServletContext servletContext; |
| |
| SessionFailoverConfigurator( ApplicationContextImpl applicationContext ) { |
| this.applicationContext = applicationContext; |
| servletContext = applicationContext.getServletContext(); |
| } |
| |
| void configure() { |
| checkServletVersion(); |
| ServletRegistration servletRegistration = findRWTServletRegistration(); |
| checkRWTServletRegistration( servletRegistration ); |
| configureJEECompatibility(); |
| configureSessionFailoverFilter( servletRegistration ); |
| } |
| |
| private void configureJEECompatibility() { |
| applicationContext.getLifeCycleFactory().configure( SimpleLifeCycle.class ); |
| } |
| |
| private void configureSessionFailoverFilter( ServletRegistration servletRegistration ) { |
| Dynamic filterRegistration = registerSessionFailoverFilter(); |
| mapFilterToServlet( filterRegistration, servletRegistration ); |
| } |
| |
| private Dynamic registerSessionFailoverFilter() { |
| Filter filter = new RWTClusterSupport(); |
| String filterName = filter.getClass().getName(); |
| return servletContext.addFilter( filterName, filter ); |
| } |
| |
| private static void mapFilterToServlet( FilterRegistration filterRegistration, |
| ServletRegistration servletRegistration ) |
| { |
| EnumSet<DispatcherType> dispatcherType = EnumSet.of( DispatcherType.REQUEST ); |
| String servletName = servletRegistration.getName(); |
| filterRegistration.addMappingForServletNames( dispatcherType, false, servletName ); |
| } |
| |
| private void checkServletVersion() { |
| if( servletContext.getMajorVersion() < 3 ) { |
| throw new IllegalStateException( "Session failover support requires Servlet 3.0 or later." ); |
| } |
| } |
| |
| private void checkRWTServletRegistration( ServletRegistration servletRegistration ) { |
| if( servletRegistration == null ) { |
| throw new IllegalStateException( "The RWT servlet registration could not be found." ); |
| } |
| } |
| |
| private ServletRegistration findRWTServletRegistration() { |
| ServletRegistration result = null; |
| ServletRegistration[] servletRegistrations = getSerlvetRegistrations(); |
| for( int i = 0; result == null && i < servletRegistrations.length; i++ ) { |
| if( RWTServlet.class.getName().equals( servletRegistrations[ i ].getClassName() ) ) { |
| result = servletRegistrations[ i ]; |
| } |
| } |
| return result; |
| } |
| |
| private ServletRegistration[] getSerlvetRegistrations() { |
| Collection<?> servletRegistrations = servletContext.getServletRegistrations().values(); |
| return servletRegistrations.toArray( new ServletRegistration[ servletRegistrations.size() ] ); |
| } |
| } |