[rules-dev] Spring support for drools-api
I've been reading about spring this weekend, in preparation of spring
support for drools-api. My first attempt was using drools-api factories
directly, which actually works "out of the box". Here is an example
using the KnowledgeAgentFactory:
--------beans.xml-------
<bean id="agent1"
class="org.drools.agent.KnowledgeAgentFactory"
factory-method="newKnowledgeAgent">
<constructor-arg type="java.lang.String" value="agent1"/>
<constructor-arg type="java.util.Properties">
<props>
<prop
key="file">src/main/java/org/drools/springframework/testSpring.drl</prop>
</props>
</constructor-arg>
</bean>
---------testSpring.drl---------
package org.drools.springframework
rule "rule 1"
when
then
System.out.println( "hello world" );
end
---------test---------
Resource resource = new FileSystemResource(
"src/main/java/org/drools/springframework/beans.xml" );
BeanFactory factory = new XmlBeanFactory( resource );
KnowledgeAgent agent1 = ( KnowledgeAgent ) factory.getBean( "agent1" );
agent1.getKnowledgeBase().newStatelessKnowledgeSession().executeObject( "test"
);
Sow I was quite impressed how easy that was to get working, but people
like the "Spring" way. So I made a custom SpringKnowledgeAgentFactory
that implements FactoryBean. So now the above beans.xml can look like
the following:
<bean id="agent1"
class="org.drools.spring.SpringKnowledgeAgentFactory">
<property name="name" value="agent1"/>
<property name="file"
value="src/main/java/org/drools/spring/testSpring.drl" />
</bean>
Which is much less verbose. So I think I'll take some time tomorrow to
do FactoryBean implementations for all main user factories from
drools-api, shouldn't take long and then we have out of the box spring
support. Anyone have any feedback, it seems that now that we have
drools-api, which provides complete implementation/interface separation,
and Spring only needs to return interfaces, this is all we need to do.
If it's quick to do, I might have a go at doing one for Guice too.
Mark