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From "Victor Subick" <>
Subject [commons-pool] Dynamic pooling configuration.
Date Fri, 16 Apr 2004 18:57:14 GMT
Hello, I have used this pooling package in the past and it is wonderful.
Thanks again (Jakarta) for a wonderful product. I love you guys and gals. 


I have a question. How can I change the behavior of the pooling package to
load all my poolable objects initially instead of on demand. Say that I
define 10 maxActives but I want to instantiate all 10 at runtime and keep
them idle forever regardless of use.  I wish this to be dynamic. So that I
can specify this behavior at runtime (via a properties file) whether it is
on demand (default behavior) or all at startup.



This behavior should be similar to how Jakarta Struts allows the ability to
change Poolable characteristics 


<object class="org.apache.commons.dbcp.PoolableConnectionFactory"
   <!-- the first argument is the ConnectionFactory -->
   <object class="org.apache.commons.dbcp.DriverManagerConnectionFactory">
      <string value="jdbc:some:connect:string"/>
      <object class="java.util.Properties" null="true"/>
   <!-- the next argument is the ObjectPool -->
   <object class="org.apache.commons.pool.impl.GenericObjectPool">
      <object class="org.apache.commons.pool.PoolableObjectFactory"
      <int value="10"/> <!-- max active -->
      <byte value="1"/> <!-- when exhausted action, 0 = fail, 1 = block, 2 =
grow -->
      <long value="2000"/> <!-- max wait -->
      <int value="10"/> <!-- max idle -->
      <boolean value="false"/> <!-- test on borrow -->
      <boolean value="false"/> <!-- test on return -->
      <long value="10000"/> <!-- time between eviction runs -->
      <int value="5"/> <!-- number of connections to test per eviction run
      <long value="5000"/> <!-- min evictable idle time -->
      <boolean value="true"/> <!-- test while idle -->
   <!-- the next argument is the KeyedObjectPoolFactory -->
   <object class="org.apache.commons.pool.StackKeyedObjectPoolFactory">
      <int value="5"/> <!-- max idle -->
   <string value="SELECT COUNT(*) FROM DUAL"/> <;!-- validation query -->
   <boolean value="false"/> <!-- default read only -->
   <boolean value="true"/> <!-- default auto commit -->




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