servicemix, oracle datasource, connection pooling, max connections - jdbc

Question

I'm trying to configure connection pooling in servcemix 4.4.1. I've created a oracle datasource object and set the properties like user, password,url. I deployed the following xml as osgi service in my smx.
Here's my datasource configuration:
<blueprint xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0">
<bean id="dataSource" class="oracle.jdbc.pool.OracleDataSource">
<property name="URL" value="jdbc:oracle:thin:#connection:url"/>
<property name="user" value="****"/>
<property name="password" value="*****"/>
</bean>
<service interface="javax.sql.DataSource" ref="dataSource">
<service-properties>
<entry key="osgi.jndi.service.name" value="oracleds"/>
</service-properties>
</service>
</blueprint>
The datasource object is created succesfully and I'm able to retrieve the object using jndi lookup in my bundle.
Now I want to apply connection pooling for which I need to declare "maximum connections". Please suggest me how can I declare max no. of connections in the above xml
Thanks in advance.

Answer 1

Here is an example of my blueprint.xml:
<blueprint xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:ext="http://aries.apache.org/blueprint/xmlns/blueprint-ext/v1.0.0"
xmlns:cm="http://aries.apache.org/blueprint/xmlns/blueprint-cm/v1.0.0"
xsi:schemaLocation=
"http://www.osgi.org/xmlns/blueprint/v1.0.0 http://www.osgi.org/xmlns/blueprint/v1.0.0/blueprint.xsd"
default-activation="eager">
<cm:property-placeholder id="server.placeholder" persistent-id="test.datasource">
<cm:default-properties>
<cm:property name="driverClassName" value="oracle.jdbc.pool.OracleDataSource" />
<cm:property name="validationQuery" value="SELECT 1 FROM DUAL" />
<cm:property name="defaultReadOnly" value="false" />
<cm:property name="defaultAutoCommit" value="true" />
<cm:property name="maxActive" value="100" />
<cm:property name="whenExhaustedAction" value="2" />
<cm:property name="maxWait" value="-1" />
<cm:property name="maxIdle" value="8" />
<cm:property name="minIdle" value="1" />
<cm:property name="testOnBorrow" value="true" />
<cm:property name="testOnReturn" value="true" />
<cm:property name="timeBetweenEvictionRunsMillis" value="-1" />
<cm:property name="numTestsPerEvictionRun" value="3" />
<cm:property name="minEvictableIdleTimeMillis" value="1800000" />
<cm:property name="testWhileIdle" value="false" />
<cm:property name="softMinEvictableIdleTimeMillis" value="-1" />
<cm:property name="lifo" value="true" />
</cm:default-properties>
</cm:property-placeholder>
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
<property name="driverClassName" value= "${driverClassName}" />
<property name="url" value="jdbc:oracle:thin:#${db.host}:${db.port}:${db.instance}" />
<property name="username" value="${db.user}" />
<property name="password" value="${db.password}" />
<property name="maxIdle" value="1" />
</bean>
<bean id="connectionFactory" class="org.apache.commons.dbcp.DataSourceConnectionFactory">
<argument ref="dataSource" />
</bean>
<bean id="connectionPool" class="org.apache.commons.pool.impl.GenericObjectPool" >
<argument><null/></argument>
<argument value="${maxActive}" />
<argument value="${whenExhaustedAction}" />
<argument value="${maxWait}" />
<argument value="${maxIdle}" />
<argument value="${minIdle}" />
<argument value="${testOnBorrow}" />
<argument value="${testOnReturn}" />
<argument value="${timeBetweenEvictionRunsMillis}" />
<argument value="${numTestsPerEvictionRun}" />
<argument value="${minEvictableIdleTimeMillis}" />
<argument value="${testWhileIdle}" />
<argument value="${softMinEvictableIdleTimeMillis}" />
<argument value="${lifo}" />
</bean>
<bean id="pooledConnectionFactory" class="org.apache.commons.dbcp.PoolableConnectionFactory" >
<argument ref="connectionFactory" />
<argument ref="connectionPool" />
<argument><null/></argument>
<argument value="${validationQuery}" />
<argument value="${defaultReadOnly}" />
<argument value="${defaultAutoCommit}" />
</bean>
<bean id="poolingDataSource" class="org.apache.commons.dbcp.PoolingDataSource" depends-on="pooledConnectionFactory">
<argument ref="connectionPool" />
</bean>
<service interface="javax.sql.DataSource" ref="poolingDataSource"> <!--ref="oracleDataSource"-->
<service-properties>
<entry key="osgi.jndi.service.name" value="jdbc/testdb"/>
<entry key="datasource.name" value="jdbc/testdb" />
</service-properties>
</service>
</blueprint>
This datasource work fine.
I think the attribute "maxActive" close to what you need.

Answer 2

You can choose between two ways:
use oracle.jdbc.pool.OracleConnectionPoolDataSource as datasource class
use commons-dbcp https://gist.github.com/splatch/2d631ec09f9be0730b1e (this is fork of somebody else gist)