Package com.levigo.jadice.web.server.filter

Class TileCacheFilter

java.lang.Object

com.levigo.jadice.web.server.filter.TileCacheFilter

All Implemented Interfaces:

jakarta.servlet.Filter

@WebFilter(description="Enable caching for jadice web toolkit tiles",
           displayName="jadice web toolkit tile caching",
           filterName="jwtTileCacheFilter",
           urlPatterns="/*",
           asyncSupported=true)
public class TileCacheFilter
extends Object
implements jakarta.servlet.Filter

This Filter adds the required HTTP Headers to the to the HttpServletResponse of the tiles to force the browser to cache the image resource that was returned and to configure the duration how long the cache entry is valid.

The maximum age is configured to 30 minutes.

This filter injects the following HTML headers into the response:

• Cache-Control: private, max-age=60 * 30
• Expires: 60 * 30 * 1000
• Pragma will be deleted, if existing

Field Summary

Fields

Modifier and Type	Field	Description
static final Pattern	PATTERN

Constructor Summary

Constructors

Constructor	Description
TileCacheFilter()
TileCacheFilter(String... additionalPatterns)

Method Summary

Modifier and Type	Method	Description
protected boolean	appliesTo(String path)	Checks whether this filter applies to the given path.
void	destroy()
void	doFilter(jakarta.servlet.ServletRequest request, jakarta.servlet.ServletResponse response, jakarta.servlet.FilterChain chain)
void	init(jakarta.servlet.FilterConfig filterConfig)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

PATTERN

public static final Pattern PATTERN

Constructor Details

TileCacheFilter

public TileCacheFilter()

TileCacheFilter

public TileCacheFilter(String... additionalPatterns)

Method Details

init

public void init(jakarta.servlet.FilterConfig filterConfig)
          throws jakarta.servlet.ServletException

Specified by:

init in interface jakarta.servlet.Filter

Throws:

jakarta.servlet.ServletException

doFilter

public void doFilter(jakarta.servlet.ServletRequest request,
 jakarta.servlet.ServletResponse response,
 jakarta.servlet.FilterChain chain)
              throws IOException,
jakarta.servlet.ServletException

Specified by:

doFilter in interface jakarta.servlet.Filter

Throws:

IOException

jakarta.servlet.ServletException

appliesTo

protected boolean appliesTo(String path)

Checks whether this filter applies to the given path.

Parameters:

path - the path of the request

Returns:

true if one of the patterns matches the given path and the headers shall be applied

destroy

public void destroy()

Specified by:

destroy in interface jakarta.servlet.Filter