how to generate barcode in vb.net 2008 Taming wild EJBs: performance and scalability in Java

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Taming wild EJBs: performance and scalability
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and you have to work through some amount of trial and error to utilize these parameters optimally to improve the performance of your EJB components. This section provides general guidelines, some of which are design practices that you can follow while building your applications. As stated earlier, it s a good idea to factor in performance considerations throughout the development lifecycle of your applications. Don t try to do it all up front, because you ll end up with a more complicated design than you need, and it s going to change anyway at multiple points during the life of the system. Don t try to do it all at the end, because you ll have to make sweeping changes in order to effectively implement the required optimizations. Follow the same strategy you would to fill your car s fuel tank; a little at a time over the life of the vehicle. Sometimes you top the tank off, and sometimes you just get $10 worth. (All right, with today s prices maybe $25.) But you don t calculate how many miles you will ever drive the car and try to carry around that much gas when you buy it. And you certainly don t wait until you want to sell the vehicle before buying any gas; it wouldn t be much use as a form of transportation if you took that approach. Simply think about where you re going in the near future, and buy that much gas. Tackle performance tuning in the same way, and you ll be on your way to a bunch of happy users. We ve already covered performance concerns surrounding entities. Let s see what we can do to make our session and message-driven beans a little snappier.
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13.3.1 Session bean performance
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Session beans are probably the most frequently used EJB component. Like the teenyboppers vying for a spot on American Idol, they re everywhere. It s hard to visit a Java EE application and not hit one. Even with the tremendous pull that alternative inversion-of-control containers like Spring have had, session EJBs live on. Since you re likely to trip over one getting to your Dilbert cube in the morning, this section will focus on how you can improve session bean performance. Local vs. remote interface EJB 3 not only provides the ability to invoke components remotely, but also empowers you to build lightweight components that can be deployed and run locally with your presentation modules. If your clients and EJB components are collocated together, then you must make sure you do not mark your interface with the @Remote annotation. @Remote uses an expensive RMI call requiring copy-byvalue semantics, even if the clients are in the same JVM. Most containers provide optimizations to change RMI calls to local EJB invocation when possible by setting
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Improving performance of EJB 3 components
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some attributes in your vendor-specific deployment descriptor. Refer to your application server documentation for details about your specific server. Use stateful session beans only when necessary We have observed gross misuse of stateful session beans, which causes developers to become disappointed with their performance. Most enterprise applications are stateless in nature, so you should determine whether you need stateful session beans. Stateless session beans perform much better than stateful session beans since they are not required to manage state. The extended persistence context is supported only with EJB 3 stateful session beans, and there is no way out if you want to use it. Later in this chapter we provide some guidelines to specifically improve performance of stateful session beans. Refactor multiple method calls to use the Session Fa ade design pattern EJB invocation is expensive, particularly when you use it remotely. You should avoid building fine-grained EJBs by following the Session Fa ade design pattern. Check to see whether you can consolidate several EJB methods into a single coarse-grained EJB method. Reducing multiple method calls to a single call will improve the performance of your EJB applications. Look at transaction attribute settings Recall from chapter 6 that transaction management is an expensive affair. Verify that each EJB method really needs a transaction. If you are using CMT (by default), the container will start a transaction for you because the default transaction attribute is Required. For methods that don t require a transaction, you should explicitly disable transactions by setting the transaction type to NOT_SUPPORTED as follows:
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@TransactionAttribute(TransactionAttributeType.NOT_SUPPORTED) public List<Item> findMostPopularItems() { ... }
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If you are confused about which transaction options are available, refer to chapter 6, or consult your application server s documentation. Optimize the stateless bean pool Stateless session bean instances are pooled and shared by clients. You should have sufficient bean instances to serve all your concurrent clients. If you don t have enough bean instances in the pool, the client will block until an instance is available. Most application servers provide the ability to configure the bean pool
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