Using Jboss Rules With Spring

http://wiki.jboss.org/wiki/Wiki.jsp?page=RulesWithSpringFramework is an excellent article on how to do this. I have made some slight modifications to this to use excel files instead of drl files and pass in a path rather than specify each file individually. Here is the code and configuration

<bean id=”huntGroupRuleBase” class=”edu.apollogrp.qtask.routing.util.RuleBaseBeanFactory”>
<property name=”drlResourcePath” value=”classpath:hunt-group-rules/*.xls”/>
<property name=”packageBuilderConfiguration”>
<bean class=”org.drools.compiler.PackageBuilderConfiguration”>
<!–<property name=”compiler” value=”PackageBuilderConfiguration.JANINO”/> –>
<property name=”compiler” value=”1″/>
</bean>
</property
</bean>

package edu.apollogrp.qtask.routing.util;

import java.io.InputStreamReader;
import java.io.Reader;
import java.io.StringReader;
import java.util.List;

import org.apache.log4j.Logger;
import org.drools.RuleBase;
import org.drools.RuleBaseFactory;
import org.drools.compiler.PackageBuilder;
import org.drools.compiler.PackageBuilderConfiguration;
import org.drools.decisiontable.InputType;
import org.drools.decisiontable.SpreadsheetCompiler;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.FactoryBean;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.core.io.Resource;
import org.springframework.util.Assert;

/**
* @author Geoffrey De Smet
* @see
http://wiki.jboss.org/wiki/Wiki.jsp?page=RulesWithSpringFramework
*
*/
public class RuleBaseBeanFactory implements FactoryBean, InitializingBean,
ApplicationContextAware {

private static final Logger log = Logger
.getLogger(RuleBaseBeanFactory.class);

private String drlResourcePath;

private RuleBase ruleBase;

private PackageBuilderConfiguration packageBuilderConfiguration;

private ApplicationContext applicationContext;

public void afterPropertiesSet() throws Exception {
Resource[] drlResourceList = applicationContext
.getResources(drlResourcePath);

Assert.notEmpty(drlResourceList, “drlResourceList must not be empty”);

PackageBuilder builder = (packageBuilderConfiguration != null ? new PackageBuilder(
packageBuilderConfiguration)
: new PackageBuilder());

SpreadsheetCompiler compiler = new SpreadsheetCompiler();

for (Resource resource : drlResourceList) {
log.info(“Reading file: ” + resource.getFilename());

Reader input = null;

// check the extension to see if this is a decision table or regular
// drl
if (resource.getFilename().endsWith(“drl”)) {
input = new InputStreamReader(resource.getInputStream());
} else if (resource.getFilename().endsWith(“xls”)) {
String drl = compiler.compile(resource.getInputStream(),
InputType.XLS);
log.debug(drl);
input = new StringReader(drl);
} else {
log.warn(“Drools resource has unknown file type: ”
+ resource.getFilename());
}
if (input != null) {
builder.addPackageFromDrl(input);
}
}
ruleBase = RuleBaseFactory.newRuleBase();
ruleBase.addPackage(builder.getPackage());
}

public RuleBase getObject() {
return ruleBase;
}

public Class getObjectType() {
return RuleBase.class;
}

public boolean isSingleton() {
return true;
}

public void setPackageBuilderConfiguration(
PackageBuilderConfiguration packageBuilderConfiguration) {
this.packageBuilderConfiguration = packageBuilderConfiguration;
}

public void setApplicationContext(ApplicationContext applicationContext)
throws BeansException {
this.applicationContext = applicationContext;
}

public void setDrlResourcePath(String drlResourcePath) {
this.drlResourcePath = drlResourcePath;
}

}

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3 thoughts on “Using Jboss Rules With Spring

  1. Neal Ravindran

    That is a good work around. The official way of configing JBoss rules does not work and the docs stink once one gets into it deeper. The DefaultSource (as used in doc) can only take a single rule.

    Questions I had with this way of doing the config..
    a) How do you account for rule sessions?
    b) With this off-beat way of doing it how are the RuleAdministrator, RuleRuntime and RuleServiceProvider objects related?

    c) This deviates from jsr94 ..correct?

    But I like your way. In documented way nothing is said about using excel, but yrs does)

  2. devender

    A. I am using this with spring, most of the beans in spring are singletons, we just make one session and reuse it for the lifetime of the application.

    B.C. Yes it does

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