Credit Card Validation --- Luhn Check

/**
 * Checks if the value is a valid credit card number
 * @param value a string
 * @return true if the value is a valid credit card number
 */
public static boolean isValid(String value){
    return luhnCheck(value.replaceAll("\\D", "")); //remove non-digits
}
 
 /**
 * Checks if a cardNumber passes LUHN check
 * @param cardNumber A string contains only digits
 * @return true if the cardNumber passes LUHN check
 */
private static boolean luhnCheck(String cardNumber){
    int sum=0;
    for (int i=cardNumber.length()-1; i>=0; i-=2){
    sum+=Integer.parseInt(cardNumber.substring(i, i+1));
        if (i>0){
            int d=2*Integer.parseInt(cardNumber.substring(i-1, i));
            if (d>9) d-=9;
            sum+=d;
        }
    }
    return sum%10==0;
}

Configure JMS Resources and create Message Driven Bean in Websphere 7 （Step 8 and 9)

Step 8: Publish a Topic JMS message

Similar to step 4, omit the steps for context lookup, use dependency injection only.

8.1 Access the JMS resources in EJB

In ibm-ejb-jar-bnd.xml under META-INF

<session name="jmsService">
    <resource-ref name="jms/MyTopicConnectionFactory" 
        binding-name="jms/TopicConnectionFactory">
    </resource-ref>
    <message-destination-ref name="jms/MyTopic" 
            binding-name="jms/Topic"/>
</session> 

Note: The binding-name attribute of <resource-ref> and <message-destination-ref> element should match the jndi name specified in Step 6 and Step 7.

Create a stateless session bean

@Stateless(name = "jmsService")
@Local(JMSService.class)
public class JMSServiceBean implements JMSService {

    @Resource(name = "jms/MyTopicConnectionFactory")
    private TopicConnectionFactory tcf;

    @Resource(name = "jms/MyTopic")
    private Topic topic;
    

    @Override
    public void broadcast() {
        try {
            TopicConnection connection = tcf.createTopicConnection();
            TopicSession session 
                = connection.createTopicSession
                (false, TopicSession.AUTO_ACKNOWLEDGE);
            TopicPublisher publisher 
                = session.createPublisher(topic);
            TextMessage message = session.createTextMessage();
            message.setText("This is a broadcast");
            publisher.send(message);
        } catch (JMSException e) {
            throw new EJBException(e);
        }
        System.out.println("Broadcasted");
    }
}

Note: the name attribute of @Resource annotation should match name attribute of <resource-ref> and <message-destination-ref> element respectively in ibm-ejb-jar-bnd.xml, not the binding-name attribute.

Write a servlet to test

public class JMSTopicPublishServlet extends HttpServlet {

    @EJB(beanName="jmsService")
    private JMSService jmsService;
    
    protected void doGet(HttpServletRequest req, 
            HttpServletResponse resp)
            throws ServletException, IOException {
        jmsService.broadcast();
    }
} 

Result

[26/08/11 15:18:00:625 EST] 0000008f SystemOut O Broadcasted

8.2 Access the JMS resources in servlet

In ibm-web-bnd.xml under WEB-INF

<resource-ref name="jms/MyTopicConnectionFactory" 
        binding-name="jms/TopicConnectionFactory">
</resource-ref>
<message-destination-ref name="jms/MyTopic" 
            binding-name="jms/Topic"/>

Note: The binding-name attribute of <resource-ref> and <message-destination-ref> element should match the jndi name specified in Step 6 and Step 7.

Write a servlet to test

public class JMSTopicPublishServlet extends HttpServlet {
    
    @Resource(name = "jms/MyTopicConnectionFactory")
    private TopicConnectionFactory tcf;

    @Resource(name = "jms/MyTopic")
    private Topic topic;
    
    protected void doGet(HttpServletRequest req, 
            HttpServletResponse resp)
            throws ServletException, IOException {
        try {
            TopicConnection connection = tcf.createTopicConnection();
            TopicSession session 
                = connection.createTopicSession
                (false, TopicSession.AUTO_ACKNOWLEDGE);
            TopicPublisher publisher 
                = session.createPublisher(topic);
            TextMessage message = session.createTextMessage();
            message.setText("This is a broadcast");
            publisher.send(message);
        } catch (JMSException e) {
            throw new EJBException(e);
        }
        System.out.println("Broadcasted");
    }
} 

Result

[26/08/11 15:23:36:218 EST] 0000008f SystemOut O Broadcasted

Step 9: Create Topic Message Driven Beans

9.1 Create a Topic Activation Specification

Similar to 5.1

Type TopicActSpec for Name
jms/TopicActSpec for JNDI name
Select Topic as Destination type
Type jms/Topic for Destination JNDI name
Select InternalJMS as Bus name

Click ‘OK’ and save the changes.

9.2 Create two Topic Message Driven Beans

@MessageDriven(name="topicMessageDrivenBean1")
public class TopicMessageDrivenBean1 implements MessageListener {

    @Override
    public void onMessage(Message message) {
        try {
                    TextMessage txtMessage = (TextMessage) message;
                    System.out.println(txtMessage.getText()
                        + " processed by bean 1");
            } catch (JMSException ex) {
                throw new EJBException(ex);
            }
    }
}

@MessageDriven(name="topicMessageDrivenBean2")
public class TopicMessageDrivenBean2 implements MessageListener {

    @Override
    public void onMessage(Message message) {
        try {
                    TextMessage txtMessage = (TextMessage) message;
                    System.out.println(txtMessage.getText()
                            + " processed by bean 2");
            } catch (JMSException ex) {
                throw new EJBException(ex);
            }
    }
}

In ibm-ejb-jar-bnd.xml under META-INF

<message-driven name="topicMessageDrivenBean1">
    <jca-adapter activation-spec-binding-name="jms/TopicActSpec"/>
</message-driven>
<message-driven name="topicMessageDrivenBean2">
    <jca-adapter activation-spec-binding-name="jms/TopicActSpec"/>
</message-driven>

Test the servlet created in step 8 and check the result

[26/08/11 15:23:36:218 EST] 0000008f SystemOut O Broadcasted
[26/08/11 15:23:36:218 EST] 000000a3 SystemOut O This is a broadcast processed by bean 2
[26/08/11 15:23:36:218 EST] 000000a6 SystemOut O This is a broadcast processed by bean 1