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You implement the same conversation as before in Java SE: three steps that must be completed as one atomic unit of work: Retrieval of an auction item for display and modification, a liquidity check of the seller account, and finally the closing of the auction. You again have to decide how you want to disable automatic flushing of the extended persistence context during the conversation, to preserve atomicity. You can choose between the Hibernate vendor extension with FlushMode.MANUAL and the official approach with nontransactional operations. Disabling flushing with a Hibernate extension Let s first write a stateful EJB, the conversation controller, with the easier Hibernate extension:

Running this is a matter of an <ant> call:

@Stateful @TransactionAttribute(TransactionAttributeType.REQUIRED) public class ManageAuctionBean implements ManageAuction { @PersistenceContext( type = PersistenceContextType.EXTENDED, properties = @PersistenceProperty( name="org.hibernate.flushMode", value="MANUAL") )

EntityManager em; public Item getAuction(Long itemId) { return em.find(Item.class, itemId); } public boolean sellerHasEnoughMoney(User seller) { boolean sellerCanAffordIt = (Boolean) em.createQuery("select...").getSingleResult(); return sellerCanAffordIt; } @Remove public void endAuction(Item item, User buyer) { // Set winning bid // Charge seller // Notify seller and winner item.setBuyer(...); em.flush(); } }

The full build file contains validation tests in the init target, for a more robust build. In particular, the target verifies that all the configuration files were present, and that target.servertype is defined.

This bean implements the three methods of the ManageAuction interface (we don t have to show you this interface). First, it s a stateful EJB; the container creates and reserves an instance for a particular client. When a client obtains a handle to this EJB for the first time, a new instance is created and a new extended persistence context is injected by the container. The persistence context is now bound to the lifecycle of the EJB instance and is closed when the method marked as @Remove returns. Notice how you can read the methods of the EJB like a story of your conversation, one step after another. You can annotate several methods with @Remove; for example, you can add a cancel() method to undo all conversation steps. This is a strong and convenient programming model for conversations, all built-in for free with EJB 3.0. Next is the problem of automatic flushing. All methods of the ManageAuctionBean require a transaction; you declare this on the class level. The sellerHasEnoughMoney() method, step two in the conversation, flushes the persistence context before executing the query and again when the transaction of that method returns. To prevent that, you declare that the injected persistence context should be in FlushMode.MANUAL, a Hibernate extension. It s now your responsibility to flush the persistence context whenever you want to write the queued SQL DML to the database you do this only once at the end of the conversation. Your transaction assembly is now decoupled from the flush behavior of the persistence engine.

Writing the build file for installing to a server For our Tomcat 4.0 deployment, we have taken the code from section 7.7, somewhat simplified as we know we are always deploying to the local host. We do want to be rigorous in deployment, however, copying the files in under the CATALINA_ HOME/webapps directory, so that when the server restarts our application restarts with it. Reusing the same tricks of section 18.5.5 to load application-specific content, we set up some properties to point to the destination directories and files:

Disabling flushing by disabling transactions The official solution, according to the EJB 3.0 specification, mixes these two concerns. You prevent automatic flushing by making all steps of the conversation (except the last one) nontransactional:

<property name="target.deploy.directory" location="${env.CATALINA_HOME}/webapps"/> <property name="webapp.expanded.dir" location="${target.deploy.directory}/${target.appname}" /> <property name="webapp.copied.file" location="${target.deploy.directory}/${target.appname}.war" />

@Stateful @TransactionAttribute(TransactionAttributeType.NOT_SUPPORTED) public class ManageAuctionBean implements ManageAuction { @PersistenceContext(type = PersistenceContextType.EXTENDED) EntityManager em; public Item getAuction(Long itemId) { return em.find(Item.class, itemId); } public boolean sellerHasEnoughMoney(User seller) { boolean sellerCanAffordIt = (Boolean) em.createQuery("select...").getSingleResult(); return sellerCanAffordIt; } @Remove @TransactionAttribute(TransactionAttributeType.REQUIRED) public void endAuction(Item item, User buyer) { // Set winning bid // Charge seller // Notify seller and winner item.setBuyer(...); } }

We copy the unexpanded WAR file for server restart, and then expand it for the installation onto the running server. Unloading the current installation We will omit the unload target, which issues a <get> against

In this implementation, you switch to a different default for all methods, TransactionAttributeType.NOT_SUPPORTED, and require a transaction only for the endAuction() method. This last transaction also flushes the persistence context at commit time. All methods that now call the EntityManager without transactions are effectively running in autocommit mode, which we discussed in the previous chapter. Complex transaction assemblies You ve now used a few different TransactionAttributeType annotations; see the complete list of available options in Table 11.1. The most commonly used transaction attribute type is REQUIRED, which is the default for all stateless and stateful EJB methods. To disable automatic flushing of the extended persistence context for a method in a stateful session bean, switch to NOT_SUPPORTED or even NEVER.