Mercurial > dive4elements > river
comparison flys-client/src/main/java/de/intevation/flys/client/server/filter/NoCacheFilter.java @ 4436:9fca4d60fb7c
Reintroduce wrongly outbacked changes (rev 4418-4425).
| author | Felix Wolfsteller <felix.wolfsteller@intevation.de> |
|---|---|
| date | Wed, 07 Nov 2012 13:49:32 +0100 |
| parents | 687b7a6f09aa |
| children | cc6323401643 |
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| 4435:471baa410470 | 4436:9fca4d60fb7c |
|---|---|
| 1 package de.intevation.flys.client.server.filter; | |
| 2 | |
| 3 import java.io.IOException; | |
| 4 import java.util.Enumeration; | |
| 5 import java.util.Date; | |
| 6 | |
| 7 import javax.servlet.Filter; | |
| 8 import javax.servlet.FilterChain; | |
| 9 import javax.servlet.FilterConfig; | |
| 10 import javax.servlet.ServletException; | |
| 11 import javax.servlet.ServletRequest; | |
| 12 import javax.servlet.ServletResponse; | |
| 13 | |
| 14 import javax.servlet.http.HttpServletRequest; | |
| 15 import javax.servlet.http.HttpServletResponse; | |
| 16 | |
| 17 import org.apache.log4j.Logger; | |
| 18 | |
| 19 /** ServletFilter to avoid caching for GWTs *.nocache.* files. */ | |
| 20 public class NoCacheFilter implements Filter { | |
| 21 | |
| 22 private static final long DAY = 86400000L; | |
| 23 | |
| 24 private static final String NO_CACHE = ".nocache."; | |
| 25 | |
| 26 private static Logger log = Logger.getLogger(NoCacheFilter.class); | |
| 27 | |
| 28 /** | |
| 29 * Initialize. | |
| 30 */ | |
| 31 @Override | |
| 32 public void init(FilterConfig config) | |
| 33 throws ServletException | |
| 34 { | |
| 35 } | |
| 36 | |
| 37 | |
| 38 /** | |
| 39 * Called when filter in chain invoked. | |
| 40 * @param req request to servlet | |
| 41 * @param resp response of servlet | |
| 42 * @param chain the filter chain | |
| 43 */ | |
| 44 @Override | |
| 45 public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) | |
| 46 throws IOException, ServletException | |
| 47 { | |
| 48 HttpServletRequest httpreq = (HttpServletRequest)req; | |
| 49 String uri = httpreq.getRequestURI(); | |
| 50 | |
| 51 if (uri.contains(NO_CACHE)) { | |
| 52 log.debug("Set no-cache for " + uri); | |
| 53 | |
| 54 Date now = new Date(); | |
| 55 HttpServletResponse httpresp = (HttpServletResponse)resp; | |
| 56 httpresp.setDateHeader("Date", now.getTime()); | |
| 57 httpresp.setDateHeader("Expires", now.getTime() - DAY); | |
| 58 httpresp.setHeader("Pragma", "no-cache"); | |
| 59 httpresp.setHeader("Cache-control", | |
| 60 "no-cache, no-store, must-revalidate"); | |
| 61 } | |
| 62 | |
| 63 chain.doFilter(req, resp); | |
| 64 } | |
| 65 | |
| 66 | |
| 67 /** | |
| 68 * Do nothing at destruction. | |
| 69 */ | |
| 70 @Override | |
| 71 public void destroy() { | |
| 72 } | |
| 73 } | |
| 74 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |