Adds an mbean for exposing metrics around a BasicDataSource via JMX
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                 Key: DBCP-292
                 URL: https://issues.apache.org/jira/browse/DBCP-292
             Project: Commons Dbcp
          Issue Type: New Feature
    Affects Versions: 1.3
            Reporter: David Horne
            Priority: Minor


The attached patch adds an mbean that exposes the following metrics of a 
BasicDataSource via jmx: numActive, numIdle, maxActive, maxIdle, minIdle & 
maxWait.

I have put it in a new package: org.apache.commons.dbcp.management but feel 
free to put it in any package you see fit.

If using Spring the bean can be configured a little something like this:
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
 ...
</bean>

<bean id="dataSourceMBean" 
class="org.apache.commons.dbcp.management.BasicDataSourceMBean">
        <constructor-arg ref="dataSource"/>
</bean>

<bean id="mbeanExporter" class="org.springframework.jmx.export.MBeanExporter">
        <property name="beans">
                <map>
                        <entry key="DBCP:name=dataSource" 
value-ref="dataSourceMBean"/>
                </map>
        </property>
</bean>



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