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DBPrism In Memory Server implementation for External Cache Server

InMemoryServerImpl implements the interface defined by External Cache Invalidator Server. It implements his functionality using simply Java's HashMap and a Linked Lists objects. There is a main access point to pages (pagesByPath HashMap) which provides an eficient access by path to the pages stored on it, and the object located by this key, its a Hashtable which contains all the pages on behalf of the given path.

Argument provides by cocoon.xconf
  • initialCapacity, Defines initial capacity of the Hashtable for the root path /, because this Hashtable includes all the pages controled by the external invalidator server could be required a fine tunning.
  • loadFactor, Same as above defines load factor of the Hashtable for the root path.
  • invalidator-user, user name used for authorization purpose of the invalitation message.
  • invalidator-pass, password used for authorization purpose of the invalitation message.
  • Cleanup-Thread-Interval, seconds betwen every checking of invalitation queue.

user.roles example:

<?xml version="1.0"?>
<!DOCTYPE role-list [
<!ELEMENT role-list (role+)> 
<!ELEMENT role (hint*)>
<!ELEMENT hint EMPTY>
<!ATTLIST role name CDATA #REQUIRED
               shorthand CDATA #REQUIRED
               default-class CDATA #IMPLIED
>
<!ATTLIST hint shorthand CDATA #REQUIRED
               class CDATA #REQUIRED
>
]>

<role-list>
 <role name="org.apache.cocoon.components.cache.Server"
       shorthand="cache-server"
       default-class="org.apache.cocoon.components.cache.InMemoryServerImpl"/>
</role-list>
  

cocoon.xconf

<?xml version="1.0"?>
<cocoon version="2.0" user-roles="/user.roles">
.....
  <!-- DBPrism External invalidate cache Server:
        initialCapacity : number      Value for HashMap store
        loadFactor : number           Value for HashMap store
  -->
  <cache-server class="org.apache.cocoon.components.cache.InMemoryServerImpl" 
                 pool-max="1" pool-min="1"
                 logger="core.cache-server">
     <parameter name="initialCapacity" value="500"/>
     <parameter name="loadFactor" value="50"/>
     <parameter name="invalidator-user" value="invalidator"/>
     <parameter name="invalidator-pass" value="invalidator"/>
     <parameter name="Cleanup-Thread-Interval" value="1"/>
  </cache-server>
.....
</cocoon>
  


Last Update: 2003-08-07 09:43:21.0| webmaster@dbprism.com.ar
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