In another words, why use Parameter Macros here ?

Question

Why do not pass actual values directly for the parameters <high-units> and <expiry-delay> ?
In another words, why use Parameter Macros here ?
<local-scheme>
<scheme-name>example-backing-map</scheme-name>
<eviction-policy>HYBRID</eviction-policy>
*<high-units>{back-size-limit 0}</high-units>*
*<expiry-delay>{back-expiry 1h}</expiry-delay>*
<flush-delay>1m</flush-delay>
<cachestore-scheme></cachestore-scheme>
</local-scheme>
This fraction come from the following file:
<?xml version="1.0"?>
<!DOCTYPE cache-config SYSTEM "cache-config.dtd">
<cache-config>
    <caching-scheme-mapping>
        <cache-mapping>
            <cache-name>test</cache-name>
            <scheme-name>example-near</scheme-name>
        </cache-mapping>
    </caching-scheme-mapping>
    <caching-schemes>
        <distributed-scheme>
            <scheme-name>example-distributed</scheme-name>
            <service-name>DistributedCache</service-name>
            <backing-map-scheme>
                <local-scheme>
                    <scheme-ref>example-backing-map</scheme-ref>
                </local-scheme>
            </backing-map-scheme>
            <autostart>true</autostart>
        </distributed-scheme>
        <near-scheme>
            <scheme-name>example-near</scheme-name>
            <front-scheme>
                <local-scheme>
                    <eviction-policy>
                        <class-scheme>
                            <class-name>MyEvictionPolicy</class-name>
                        </class-scheme>
                    </eviction-policy>
                    <high-units>10</high-units>
                </local-scheme>
            </front-scheme>
            <back-scheme>
                <distributed-scheme>
                    <scheme-ref>example-distributed</scheme-ref>
                </distributed-scheme>
            </back-scheme>
            <invalidation-strategy>all</invalidation-strategy>
            <autostart>true</autostart>
        </near-scheme>
        <local-scheme>
            <scheme-name>example-backing-map</scheme-name>
            <eviction-policy>HYBRID</eviction-policy>
            <high-units>{back-size-limit 0}</high-units>
            <expiry-delay>{back-expiry 1h}</expiry-delay>
            <flush-delay>1m</flush-delay>
            <cachestore-scheme></cachestore-scheme>
        </local-scheme>
    </caching-schemes>
</cache-config>Edited by: qkc on 30-Nov-2009 08:32

Answer 1

qkc wrote:
Where do back-size-limit and back-expiry come from?You can specify them as init parameters within the cache-mapping.
<cache-config>
  <caching-scheme-mapping>
    <cache-mapping>
      <cache-name>test</cache-name>
      <scheme-name>example-near</scheme-name>
      <init-params>
        <init-param>
          <param-name>back-size-limit</param-name>
          <param-value>...</param-value>
        </init-param>
        <init-param>
          <param-name>back-expiry</param-name>
          <param-value>...</param-value>
        </init-param>
      </init-params>
    </cache-mapping>
    ...Best regards,
Robert