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annotate flys-client/src/main/java/de/intevation/flys/client/server/NoCacheFilter.java @ 4421:0b0f415203f0

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Add new Filter class to change caching Add new Filter class to avoid caching of GWT nocache files in browsers and http proxies. The new Filter class NoCacheFilter sets http headers to stop the proxies and browesers from storing the nocache files.
author Björn Ricks <bjoern.ricks@intevation.de>
date Tue, 06 Nov 2012 13:32:06 +0100
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4421
0b0f415203f0 Add new Filter class to change caching
Björn Ricks <bjoern.ricks@intevation.de>
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1 package de.intevation.flys.client.server;
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2
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3 import java.io.IOException;
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4 import java.util.Enumeration;
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5 import java.util.Date;
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6
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7 import javax.servlet.Filter;
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8 import javax.servlet.FilterChain;
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9 import javax.servlet.FilterConfig;
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10 import javax.servlet.ServletException;
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11 import javax.servlet.ServletRequest;
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12 import javax.servlet.ServletResponse;
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13
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14 import javax.servlet.http.HttpServletRequest;
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15 import javax.servlet.http.HttpServletResponse;
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16
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17 import org.apache.log4j.Logger;
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18
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19 /** ServletFilter to avoid caching for GWTs *.nocache.* files. */
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20 public class NoCacheFilter implements Filter {
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21
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22 private static final long DAY = 86400000L;
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23
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24 private static final String NO_CACHE = ".nocache.";
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25
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26 private static Logger log = Logger.getLogger(NoCacheFilter.class);
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27
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28 /**
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29 * Initialize.
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30 */
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31 @Override
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32 public void init(FilterConfig config)
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33 throws ServletException
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34 {
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35 }
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36
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37
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38 /**
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39 * Called when filter in chain invoked.
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40 * @param req request to servlet
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41 * @param resp response of servlet
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42 * @param chain the filter chain
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43 */
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44 @Override
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45 public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain)
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46 throws IOException, ServletException
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47 {
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48 HttpServletRequest httpreq = (HttpServletRequest)req;
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49 String uri = httpreq.getRequestURI();
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50
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51 if (uri.contains(NO_CACHE)) {
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52 log.debug("Set no-cache for " + uri);
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53
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54 Date now = new Date();
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55 HttpServletResponse httpresp = (HttpServletResponse)resp;
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56 httpresp.setDateHeader("Date", now.getTime());
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57 httpresp.setDateHeader("Expires", now.getTime() - DAY);
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58 httpresp.setHeader("Pragma", "no-cache");
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59 httpresp.setHeader("Cache-control",
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60 "no-cache, no-store, must-revalidate");
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61 }
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62
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63 chain.doFilter(req, resp);
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64 }
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65
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66
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67 /**
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68 * Do nothing at destruction.
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69 */
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70 @Override
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71 public void destroy() {
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72 }
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73 }
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74 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org