Can I use multiple C3P0 datasources for DB instance? - spring

Question

I was wondering if I can run multiple c3p0 datasources for one DB, something like:
<bean id="dataSource1" class = "com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close">
<property name="driverClass" value="${db.driverClassName}"/>
<property name="jdbcUrl" value="${db.url}/schema1"/>
<property name="user" value="${db.username}"/>
<property name="password" value="${db.password}"/>
<property name="acquireIncrement" value="1" />
<property name="idleConnectionTestPeriod" value="100"/>
<property name="minPoolSize" value="5" />
<property name="maxPoolSize" value="50" />
<property name="maxIdleTime" value="1800" />
</bean>
<bean id="dataSource2" class = "com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close">
<property name="driverClass" value="${db.driverClassName}"/>
<property name="jdbcUrl" value="${db.url}/schema2"/>
<property name="user" value="${db.username}"/>
<property name="password" value="${db.password}"/>
<property name="acquireIncrement" value="1" />
<property name="idleConnectionTestPeriod" value="100"/>
<property name="minPoolSize" value="5" />
<property name="maxPoolSize" value="50" />
<property name="maxIdleTime" value="1800" />
</bean>
They will be used by difference persistence services.
Thanks.

Answer 1

That's absolutely fine. You'll run into some configuration issues like:
autowiring DataSource by type won't work
#Transactional/declarative transactions will work only against one, selected DataSource. Alternatively you'll have to manually tell which transaction manager you want to use (thus you'll need two transaction managers as well: transactionManager1 and transactionManager2):
#Transactional("transactionalManager2")
Besides, there's nothing wrong with this configuration. Actually it's a pretty good idea (+1): if some layers/components of your application saturate the pool, others can still operate.
The only thing I recommend is to use lesser known abstract/parent bean declarations to avoid repetition:
<bean id="dataSource" abstract="true" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close">
<property name="driverClass" value="${db.driverClassName}"/>
<property name="user" value="${db.username}"/>
<property name="password" value="${db.password}"/>
<property name="acquireIncrement" value="1" />
<property name="idleConnectionTestPeriod" value="100"/>
<property name="minPoolSize" value="5" />
<property name="maxPoolSize" value="50" />
<property name="maxIdleTime" value="1800" />
</bean>
<bean id="dataSource1" parent="dataSource">
<property name="jdbcUrl" value="${db.url}/schema1"/>
</bean>
<bean id="dataSource2" parent="dataSource">
<property name="jdbcUrl" value="${db.url}/schema2"/>
</bean>
See also:
What is meant by abstract="true" in spring?