Skip-cache-attribute
This defines an attribute that, when present in a request, specifies that the response cannot be retrieved from or stored in the specific cache instance. The following three examples illustrate the use of this attribute.
Example | -3 applies to the base cache; Example | -4 applies to cacheinstance1. To invoke the skip-cache functionality, simply set the request attribute previewRequest to true as shown in Example | -5. SkipCache.jsp is then not retrieved from cache regardless of its cache policy.
Example 6-3 cachespec.xml (Base Cache)
<cache>
<skip-cache-attribute>previewRequest</skip-cache-attribute>
.
.
.
</cache>
Example 6-4 cachespec.xml (cacheinstance1)
<cache-instance name="cacheinstance1">
<skip-cache-attribute>previewRequest</skip-cache-attribute>
.
.
.
</cache-instance>
Example 6-5 Invoking skip-cache from a filter
public void doFilter (ServletRequest request, ServletResponse response, FilterChain chain) {
try {
String parm = request.getParameter("previewRequest");
if (parm == null)
request.setAttribute("previewRequest",null);
else if (parm.equals("true"))
request.setAttribute("previewRequest","true");
else if (parm.equals("false"))
request.setAttribute("previewRequest","false");
chain.doFilter(request, response);
}
catch (Throwable t) {}}
