Mercurial > dive4elements > river
comparison gwt-client/src/main/java/org/dive4elements/river/client/server/filter/NoCacheFilter.java @ 5838:5aa05a7a34b7
Rename modules to more fitting names.
| author | Sascha L. Teichmann <teichmann@intevation.de> |
|---|---|
| date | Thu, 25 Apr 2013 15:23:37 +0200 |
| parents | flys-client/src/main/java/org/dive4elements/river/client/server/filter/NoCacheFilter.java@821a02bbfb4e |
| children | 172338b1407f |
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| 5837:d9901a08d0a6 | 5838:5aa05a7a34b7 |
|---|---|
| 1 package org.dive4elements.river.client.server.filter; | |
| 2 | |
| 3 import java.io.IOException; | |
| 4 import java.util.Date; | |
| 5 | |
| 6 import javax.servlet.Filter; | |
| 7 import javax.servlet.FilterChain; | |
| 8 import javax.servlet.FilterConfig; | |
| 9 import javax.servlet.ServletException; | |
| 10 import javax.servlet.ServletRequest; | |
| 11 import javax.servlet.ServletResponse; | |
| 12 import javax.servlet.http.HttpServletRequest; | |
| 13 import javax.servlet.http.HttpServletResponse; | |
| 14 | |
| 15 import org.apache.log4j.Logger; | |
| 16 | |
| 17 /** ServletFilter to avoid caching for GWTs *.nocache.* files. */ | |
| 18 public class NoCacheFilter implements Filter { | |
| 19 | |
| 20 private static final long DAY = 86400000L; | |
| 21 | |
| 22 private static final String NO_CACHE = ".nocache."; | |
| 23 | |
| 24 private static Logger log = Logger.getLogger(NoCacheFilter.class); | |
| 25 | |
| 26 /** | |
| 27 * Initialize. | |
| 28 */ | |
| 29 @Override | |
| 30 public void init(FilterConfig config) | |
| 31 throws ServletException | |
| 32 { | |
| 33 } | |
| 34 | |
| 35 | |
| 36 /** | |
| 37 * Called when filter in chain invoked. | |
| 38 * @param req request to servlet | |
| 39 * @param resp response of servlet | |
| 40 * @param chain the filter chain | |
| 41 */ | |
| 42 @Override | |
| 43 public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) | |
| 44 throws IOException, ServletException | |
| 45 { | |
| 46 HttpServletRequest httpreq = (HttpServletRequest)req; | |
| 47 String uri = httpreq.getRequestURI(); | |
| 48 | |
| 49 if (uri.contains(NO_CACHE)) { | |
| 50 log.debug("Set no-cache for " + uri); | |
| 51 | |
| 52 Date now = new Date(); | |
| 53 HttpServletResponse httpresp = (HttpServletResponse)resp; | |
| 54 httpresp.setDateHeader("Date", now.getTime()); | |
| 55 httpresp.setDateHeader("Expires", now.getTime() - DAY); | |
| 56 httpresp.setHeader("Pragma", "no-cache"); | |
| 57 httpresp.setHeader("Cache-control", | |
| 58 "no-cache, no-store, must-revalidate"); | |
| 59 } | |
| 60 | |
| 61 chain.doFilter(req, resp); | |
| 62 } | |
| 63 | |
| 64 | |
| 65 /** | |
| 66 * Do nothing at destruction. | |
| 67 */ | |
| 68 @Override | |
| 69 public void destroy() { | |
| 70 } | |
| 71 } | |
| 72 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |