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- Windows, Linux or Solaris operating system should exist.
- WSO2 BRS should be installed. To install the BRS, refer Installing the Product. This also includes installing Apache Ant as one of the Installation Prerequisites.
- WSO2 BRS should be started as described in Running the Product.
Sample
...
configuration
| Table of Contents | ||||
|---|---|---|---|---|
|
Sample
...
rule definition
Rules
Rule 1 : If the time is between 12 and 18, say good afternoon.
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| Code Block | ||
|---|---|---|
| ||
package samples.greeting;
import java.util.Calendar;
/**
* User
*/
public class User {
private String name ;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int now(){
Calendar cal = Calendar.getInstance();
return cal.get(Calendar.HOUR_OF_DAY);
}
}
package samples.greeting;
/**
* greeting message
*/
public class GreetingMessage {
private String message ;
public String getMessage() {
return message;
}
public void setMessage(String message) {
this.message = message;
}
} |
Rule
...
service configuration (service.rsl)
An in-line rule set is used within the service.rsl file as follows.
| Code Block | ||
|---|---|---|
| ||
<ruleService
name="GreetingService"
xmlns="http://wso2.org/carbon/rules"
targetNamespace="http://com.test/greeting">
<ruleSet>
<rule resourceType="regular" sourceType="inline">
<![CDATA[
package greeting
import samples.greeting.GreetingMessage;
import samples.greeting.User;
rule "Is Morning" no-loop true
when
user : User()
eval((6 < user.now()) && (user.now()< 12))
then
GreetingMessage msg = new GreetingMessage();
msg.setMessage("Good Morning " + user.getName() + " !!! ");
insertLogical(msg);
end
rule "Is afternoon" no-loop true
when
user : User()
eval((12 <= user.now()) && (user.now() < 18))
then
GreetingMessage msg = new GreetingMessage();
msg.setMessage("Good Afternoon " + user.getName() + " !!! ");
insertLogical(msg);
end
rule "Is Night" no-loop true
when
user : User()
eval( (18 <= user.now()) && (user.now() < 24))
then
GreetingMessage msg = new GreetingMessage();
msg.setMessage("Good Night " + user.getName() + " !!! ");
insertLogical(msg);
end
]]>
</rule>
</ruleSet>
<operation name="greetMe">
<input wrapperElementName="user" namespace="http://com.test/greeting">
<fact elementName="user" namespace="http://com.test/greeting" type="samples.greeting.User"></fact>
</input>
<output wrapperElementName="greetingMessage" namespace="http://com.test/greeting">
<fact elementName="greetingMessage" namespace="http://com.test/greeting" type="samples.greeting.GreetingMessage"></fact>
</output>
</operation>
</ruleService> |
Executing the
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service
To execute the service, run the ant command from the <PRODUCT_HOME>/samples/greeting.service directory to run the Greetings Service.
| Info |
|---|
Before executing this service, it is recommended that you refer Exposing Rules as Services which explains in detail the process of writing and deploying a business rule. |
Deploying and
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testing the
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service
- Deploy the rule service through the BRS management console. You can follow either of the two methods:
- Bundle all artifacts in an .aar file and upload it (Rule Service -> Upload menu).
- Create using the Rule Service wizard UI (Rule Service -> Create menu).
The above steps are discussed in detail in section Exposing Rules as Services. - After deployment, click on List under Services in the main tab of the management console. The service will appear in the Deployed Services page.
- Click Greeting Service to access the dashboard of the service.
- Click Try this service in the Client Operations widget of the dashboard to invoke the Try-it tool.
Issue a request similar to the following in the Try-it tool:
Code Block language html/xml <name>your name</name>
You would get the following response:Code Block language html/xml <message>Good Early Morning Test Name !!! </message>
Alternatively, you can click Generate Axis 2 Client in the Client Operations widget of the dashboard to invoke the service. A client using generated stub codes is shown below where the codes were generated with the Unpacks the databinding classes check box checked.
Code Block language java package org.wso2.carbon.samples; import java.lang.String; import org.wso2.carbon.samples.greetingService.greeting.*; import org.apache.axis2.AxisFault; import java.rmi.RemoteException; public class GreetingServiceTestCase { public static void main(String[] args) { try { GreetingServiceStub greetingServiceStub = new GreetingServiceStub("http://localhost:9763/services/GreetingService"); UserE userRequest = new UserE(); User user = new User(); user.setName("your name"); User[] users = new User[1]; users[0] = user; userRequest.setUser(users); GreetingMessage[] greetingMessages = greetingServiceStub.greetMe(users); String result = greetingMessages[0].getMessage(); System.out.println(result); } catch (AxisFault axisFault) { axisFault.printStackTrace(); } catch (RemoteException e) { e.printStackTrace(); } } }
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