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Read-only entities You can significantly improve application performance by using read-only entities Examine your applications to determine whether any entities may be made read-only For example, in our ActionBazaar system, office locations change very rarely and we can make the ShippingType entity read-only Unfortunately, like caching features, the read-only feature is a vendor extension and you have to depend on either a vendor-specific API or configuration to mark an entity as readonly Normally, read-only entity instances will be loaded into the PersistenceUnit cache and never discarded Read-only entities will significantly improve performance because persistence providers won t calculate the change set for the read-only entity, and no clone or merge operations will be performed against a read-only entity Caching best practices Understanding your applications and checking your caching strategy usually makes sense for your applications.

The cache is best used for entities that are not frequently updated or that are read only Make sure that table data is updated only by the application that is using the cache, because if any external applications update the same cache, someone working with the cache will end up with stale data Check your persistence provider for details on how they support caching entities and queries; the caching mechanism varies from provider to provider For example, one provider may follow this rule: if an entity is updated in a transaction, then the entity will be updated in the cache when the transaction is committed to the database However, some persistence providers may choose to expire the cache instead Stress-test your applications with and without a cache.

When advice code is executed before, after, or around a joinpoint, programmers sometimes need to retrieve information about the current joinpoint. For example, a programmer may need to know what the method associated with the joinpoint is or what the arguments of the call are. The gathering of such information is called joinpoint introspection. All four AOP tools presented in this book support this feature. AspectJ provides the keyword thisJoinPoint for introspecting joinpoints in advice code. This keyword returns a reference to an object created by AspectJ for each encountered joinpoint. This object implements the org.aspectj.lang.JoinPoint interface and, depending on the joinpoint type, several distinct methods exist for retrieving information about the current joinpoint. With JAC, Spring AOP, and JBoss AOP, advice code consists of regular Java methods. These methods are called each time a joinpoint matches a defined pointcut. These methods take as a parameter an object that, similar to the AspectJ keyword thisJoinPoint, provides information about the current joinpoint. With JAC and Spring AOP, the interface implemented by this object is org.aopalliance.intercept.Joinpoint, which belongs to the AOP Alliance standard API. JBoss AOP uses a similar but JBoss-specific interface: org.jboss.aop.joinpoint.Invocation.

Unlike recipe 1.1, you cannot create only the default InitialContext instance and be able to invoke a remote EJB. You must pass in some properties that let the context find the Java Naming and Directory Interface (JNDI) system used for the remote EJBs. For example, the private method in listing 1.2 looks up a remote EJB home object in a Weblogic EJB container.

It s the only way to determine if using the cache, and more specifically the particular cache configuration, will improve or degrade your applications performance That concludes our discussion on improving EJB 3 entity performance Are you feeling faster yet Even if you re not, your entities should be Next, let s look at how you can improve the performance of session and message-driven beans..

Most application servers provide the ability to generate usage and utilization statistics of EJB components such as session beans and MDBs grouped by application. You have to read your vendor documentation about the parameters they provide,

private EquityHome getEquityHome() { try { // Get an InitialContext Properties props = new Properties(); props.put( Context.INITIAL_CONTEXT_FACTORY,