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This step is even more important in our case since no messages are sent out until our transactional session is committed when we close the session. If all goes well, a message containing the shipping request winds up in the queue. Before we look at the message consumer code that receives this message, let s discuss the javax.jms.Message object in a little more detail.

In order to manage their state, you want your EJBs to know when a transaction starts, completes, and/or rolls back.

The Message interface standardizes what is exchanged across JMS and is an extremely robust data encapsulation mechanism. As figure 4.6 shows, a JMS message has the following parts: the message header, message properties, and the message body, each of which is detailed in the sections that follow. A good analogy for JMS messages is mailing envelopes. Let s see how this analogy fits next.

Message headers Headers are name-value pairs common to all messages. In our envelope analogy, the message header is the information on an envelope that is pretty standard: the to and from addresses, postage, and postmark. For example, the JMS message version of a postmark is the JMSTimestamp header. MOM sets this header to the current time when the message is sent. Here are some other commonly used JMS headers:

public void setBalance(BigDecimal balance) { this.balance = balance; } public void setCreditLine(BigDecimal n) { this.creditLine = n; } public void setBeginBalance(BigDecimal n) { this.beginBalance = n; } public void setBeginBalanceTimeStamp(java.util.Date beginBalanceTimeStamp) { this.beginBalanceTimeStamp = beginBalanceTimeStamp; } // methods ejb home public String ejbCreate(String accountId, String type, String description, BigDecimal balance, BigDecimal creditLine, BigDecimal beginBalance, java.util.Date beginBalanceTimeStamp, ArrayList customerIds) throws CreateException, MissingPrimaryKeyException { if ((accountId == null) || (accountId.trim().length() == 0)) { throw new MissingPrimaryKeyException("ejbCreate: accountId is empty"); } this.accountId = accountId; this.type = type; this.description = description; this.balance = balance; this.creditLine = creditLine; this.beginBalance = beginBalance; this.beginBalanceTimeStamp = beginBalanceTimeStamp; this.customerIds = customerIds; try { insertRow(); } catch (Exception ex) { throw new EJBException("ejbCreate: " + ex.getMessage()); } return accountId; } public String ejbFindByPrimaryKey(String primaryKey) throws FinderException { boolean result; try { result = selectByPrimaryKey(primaryKey); } catch (Exception ex) { throw new EJBException("ejbFindByPrimaryKey: " + ex.getMessage()); } if (result) { return primaryKey; } else { throw new ObjectNotFoundException("Row "+primaryKey+" not found."); } } public Collection ejbFindByCustomerId(String customerId) throws FinderException {

You don t want to use bean-managed transactions, but you do want to be notified when a transaction starts and when one completes. Being notified of transaction events allows your beans to manage their member state variables appropriately. For instance, when a transaction starts, you want to make sure the EJB has initialized its state variables. When the transaction completes, you want to make sure you are preparing state variables for the next transaction. This doesn t apply to stateless session beans, because they should not contain any state that needs to be managed at transaction boundaries.

Message properties Message properties are just like headers, but are explicitly created by the application instead of being standard across messages. In the envelope analogy, if you decide to write Happy Holidays on the envelope to let the receiver know the envelope contains a gift or note, the text is a property instead of a header. In the ActionBazaar example, one way to mark a shipping request as fragile would be to add a boolean property called Fragile and set it to true. The code to do this would look like this:

message.setBooleanProperty("Fragile", true);

Message body The message body contains the contents of the envelope; it is the payload of the message. What you re trying to send in the body determines what message type you should use. In listing 4.1, we chose javax.jms.ObjectMessage because we were sending out the ShippingRequest Java object. Alternatively, we could have chosen to send BytesMessage, MapMessage, StreamMessage, or TextMessage. Each of these message types has a slightly different interface and usage pattern. There are no hard-and-fast rules dictating the choice of message types. Explore all the choices before making a decision for your application.

To get information about transaction status for stateful session beans, implement the javax.ejb.SessionSynchronization interface. The example session bean in listing 5.6 receives a callback for the beginning, successful completion, and postcompletion of a transaction.