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In the ActionBazaar example, you might want a receipt confirmation from Turtle once they have the shipping request you sent to the queue. A third kind of model called request-reply comes in handy in these kinds of situations. In this model, we give the message receiver enough information so that they might call us back. This is known as an overlay model because it is typically implemented on top of either the PTP or pub-sub models. For example, in the PTP model the sender specifies a queue to be used to send a reply to (in JMS, this is called the reply to queue) as well as a unique ID shared by both the outgoing and incoming messages (known as the correlation ID in JMS). The receiver receives the message and sends a reply to the reply queue, copying the correlation ID. The sender receives the message in the reply queue and determines which message received a reply by matching the correlation ID.

Develop a session bean that contains a business method that updates the entity beans within its transaction. In addition, each entity bean s transaction attribute should not be set to RequiresNew, Never, or NotSupported ; you must set it to Requires , Mandatory, or Supports . The SampleBean session bean shown in listing 5.5 updates two entity beans in a single transaction.

Listing 11-2. The Account EJB 001 002 003 004 005 006 007 008 009 010 011 012 013 014 015 016 017 018 019 020 021 022 023 024 025 026 027 028 029 030 031 032 033 034 035 036 037 038 039 040 041 042 043 044 045 046 package aop.j2ee.business.entity.account; import import import import import import import import import import import java.sql.*; javax.sql.*; java.util.*; java.math.*; javax.ejb.*; javax.naming.*; aop.j2ee.commons.exception.*; aop.j2ee.commons.util.Debug; aop.j2ee.commons.util.CodedNames; aop.j2ee.commons.util.DBHelper; aop.j2ee.commons.to.AccountDetails;

In this section we provide an overview to JMS API by building a basic message producer. JMS is a deceptively simple and small API to a very powerful technology. The JMS API is to messaging what the Java Database Connectivity (JDBC) API is to database access. JMS provides a uniform, standard way of accessing MOM in Java and is therefore an alternative to using product-specific APIs. With the exception of Microsoft Message Queuing (MSMQ), most major MOM products support JMS. The easiest way to learn JMS might be by looking at code in action. We re going to explore JMS by first developing the ActionBazaar code that sends out the shipping request. We develop a message producer using JMS and learn about structure of the message interface; then in the next section, we develop the message consumer using MDBs.

As we described in our scenario in section 4.1.2, when a user places an order for an ActionBazaar Special, a shipping request is sent to a queue shared between ActionBazaar and Turtle. The code in listing 4.1 sends the message out and could be part of a method in a simple Java object invoked by the ActionBazaar application. All relevant shipping information such as the item number, shipping address, shipping method, and insurance amount is packed into a message and sent out to ShippingRequestQueue.

public class SampleBean implements SessionBean { private SampleEntityBean bean1; private SampleEntityBean bean2; /** * Sample business method executing in a single transaction. */ public void commitMultipleEntities() { bean1.setMyAttribute( "abc" ); bean2.setMyAttribute( "def" ); } //session bean methods below }

@Resource(name="jms/QueueConnectionFactory") private ConnectionFactory connectionFactory; @Resource(name="jms/ShippingRequestQueue") private Destination destination;

public class AccountBean implements EntityBean { private private private private private private private private String accountId; String type; String description; BigDecimal balance; BigDecimal creditLine; BigDecimal beginBalance; java.util.Date beginBalanceTimeStamp; ArrayList customerIds;

Connection connection = connectionFactory.createConnection(); Session session = connection.createSession(true, Session.AUTO_ACKNOWLEDGE); MessageProducer producer = session.createProducer(destination); ObjectMessage message = session.createObjectMessage(); ShippingRequest shippingRequest = new ShippingRequest(); shippingRequest.setItem(item); Creates shippingRequest.setShippingAddress(address); payload shippingRequest.setShippingMethod(method); shippingRequest.setInsuranceAmount(amount);

The transaction attribute for the session bean should be set to Required, Mandatory, or RequiresNew.

message.setObject(shippingRequest); producer.send(message); session.close(); connection.close();