Sun Java System Application Server Enterprise Edition 8.1 2005Q2 Developer's Guide

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### Caching Example

Here is an example cache element in the `sun-web.xml` file:

    <cache max-capacity="8192" timeout="60">
    <cache-helper name="myHelper" class-name="MyCacheHelper"/>
    <cache-mapping>
    	<servlet-name>myservlet</servlet-name>
    	<timeout name="timefield">120</timeout>
    	<http-method>GET</http-method>
    	<http-method>POST</http-method>
    </cache-mapping>
    <cache-mapping>
    	<url-pattern> /catalog/* </url-pattern>
    	<!-- cache the best selling category; cache the responses to
    	   -- this resource only when the given parameters exist. Cache
    	   -- only when the catalog parameter has 'lilies' or 'roses'
    	   -- but no other catalog varieties:
    	  -- /orchard/catalog?best&category='lilies'
    	  -- /orchard/catalog?best&category='roses'
    	  -- but not the result of
    	   -- /orchard/catalog?best&category='wild'
    	-->
    	<constraint-field name='best' scope='request.parameter'/>
    	<constraint-field name='category' scope='request.parameter'>
    		<value> roses </value>
    		<value> lilies </value>
    	</constraint-field>
    	 <!-- Specify that a particular field is of given range but the
    	   -- field doesn't need to be present in all the requests -->
    	<constraint-field name='SKUnum' scope='request.parameter'>
    		<value match-expr='in-range'> 1000 - 2000 </value>
    	</constraint-field>
    	<!-- cache when the category matches with any value other than
    	   -- a specific value -->
    	<constraint-field name="category" scope="request.parameter>
    		<value match-expr="equals" cache-on-match-failure="true">
           bogus
    		</value>
    	</constraint-field>
    </cache-mapping>
    <cache-mapping>
    	<servlet-name> InfoServlet </servlet-name>
    	<cache-helper-ref>myHelper</cache-helper-ref>
    </cache-mapping>
    </cache>

For more information about the `sun-web.xml` caching settings, see cache.

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