TransactionFilter.java |
/* Copyright 2003 Sun Microsystems, Inc. All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: - Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. - Redistribution in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. Neither the name of Sun Microsystems, Inc. or the names of contributors may be used to endorse or promote products derived from this software without specific prior written permission. This software is provided "AS IS," without a warranty of any kind. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR DISTRIBUTING THE SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. You acknowledge that Software is not designed, licensed or intended for use in the design, construction, operation or maintenance of any nuclear facility. $Id: TransactionFilter.java,v 1.1 2003/07/23 00:41:30 gmurray Exp $ */ package com.sun.j2ee.blueprints.waf.controller.web; import java.io.*; import java.util.*; import java.net.URL; // J2EE imports import javax.servlet.*; import javax.servlet.http.*; import javax.naming.*; import javax.naming.InitialContext; import javax.naming.NamingException; import javax.transaction.*; // WAF imports import com.sun.j2ee.blueprints.waf.controller.web.util.WebKeys; public class TransactionFilter implements Filter { private HashMap urlMappings; private ServletContext context; private FilterConfig config; public void init(FilterConfig config) throws ServletException { this.config = config; this.context = config.getServletContext(); try { urlMappings = (HashMap)context.getAttribute(WebKeys.URL_MAPPINGS); } catch (Exception ex) { System.out.println("Error starting TransactionFilter: " + ex); ex.printStackTrace(); } } public void destroy() { config = null; } public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { HttpServletRequest hreq = (HttpServletRequest)request; String currentURI = hreq.getRequestURL().toString(); String currentURL = hreq.getRequestURI(); // get everything after the context root int firstSlash = currentURL.indexOf("/",1); // jump past the starting slash String targetURL = null; if (firstSlash != -1) targetURL = currentURL.substring(firstSlash + 1, currentURL.length()); // find out if the patterns match the target URL Iterator it = urlMappings.keySet().iterator(); while (it.hasNext()) { String key = (String)it.next(); URLMapping urlm = (URLMapping)urlMappings.get(key); // now check if the URL uses a transaction if (urlm.getURI().equals(targetURL) && urlm.isTransactional()) { // start the transaction boolean tx_started = false; UserTransaction ut = null; try { // Lookup the UserTransaction object InitialContext ic = new InitialContext(); ut = (UserTransaction) ic.lookup("java:comp/UserTransaction"); ut.begin(); // start the transaction. tx_started = true; } catch (NamingException ne) { // it should not have happened, but it is a recoverable error. // Just dont start the transaction. ne.printStackTrace(); } catch (NotSupportedException nse) { // Again this is a recoverable error. nse.printStackTrace(); } catch (SystemException se) { // Again this is a recoverable error. se.printStackTrace(); } try { chain.doFilter(request,response); } finally { // commit the transaction if it was started earlier successfully. try { if (tx_started && ut != null) { ut.commit(); } } catch (IllegalStateException re) { re.printStackTrace(); } catch (RollbackException re) { re.printStackTrace(); } catch (HeuristicMixedException hme) { hme.printStackTrace(); } catch (HeuristicRollbackException hre) { hre.printStackTrace(); } catch (SystemException se) { se.printStackTrace(); } } // stop the transaction // jump out of this processing return; } } // No matches if we made it to here chain.doFilter(request,response); } }
TransactionFilter.java |