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2.1.3 Using a litmus test
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Sometimes, you may want to simplify the choice of a technology. You d like a litmus test of sorts. Dip the test paper into your application. If it comes out red, choose EJB. If it comes out blue, look for something else. To make your determination, take a look at properties that enterprise applications both those defined by the EJB specification and those written within a company tend to exhibit. Enterprise applications may possess any of the following:
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Loosely coupled components Enterprise applications often contain several independent components, potentially developed by different companies. These components generally do not share the same life cycle or release schedules. Massive scalability requirements A fundamental aim of an application server is to provide a transaction monitor that serves as a throttle. Without this kind of service, every client in an enterprise could dive head first for the same database resource, creating a hot spot. With a transaction monitor in front of a resource, it s possible to gate the number of concurrent users that can use the resource. In EJB, stateless session beans serve that role well. Distributed business transactions Heterogeneous back-ends and loosely coupled components may all need to participate in the same logical business transaction. In other words, if one component or back-end fails to commit its part of a unit of work, it may be essential that the other components and back-ends involved in the transaction be able to roll back, allowing all the components to participate in a single atomic unit of work. Asynchronous APIs Clients will communicate with your application via a message queuing service or via web service APIs such as SOAP.
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Each of these four needs should serve as a piece of a decent litmus test for EJB. The more criteria that an application passes, the better the fit for EJB. Of the four, the two most critical are massive scalability and distributed business transactions. Many applications could use these services, but consider how strong their actual
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The bitter cost
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need might be. The additional costs of EJB may not warrant the burden of EJB for just a passing need. Be careful, though. No litmus test is perfect. Many applications make excellent use of stateless session beans, without using EJB persistence or messaging at all. With complex business transactions and the need for the scalability, the security, and the clustering that EJB provides, its use is perfectly justified. By contrast, some applications demand these requirements in spades, but specialized requirements like the support for certain threading models in legacy Java applications make EJB completely impractical. Although not foolproof, this test nonetheless offers one quick method for narrowing the criteria and determining whether EJB are appropriate for an application (figure 2.1).
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2.1.4 Passing the test
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Before we look at a poor fit for EJB, let s take a look at a few applications that meet the requirements well:
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An online order processing system might need to integrate with a bank s automated account access services. This integration might not be achievable through a few simple APIs that provide enough functionality for the business needs without EJB. A rail yard management system may need to manage the trains in the yard. The application may need to integrate with several back-end databases, including Informix and DB2. Since tracks are shared across multiple enterprises, a transactionally aware messaging layer using message driven beans and XML would fit well. The OSS Java Initiative (http://java.sun.com/products/oss) is a set of standards designed to address the needs of telecommunications operations support systems (OSS). As an industry standard, different telecommunications companies implement a variety of loosely coupled distributed components for their individual systems. These systems may use different technologies for storing application data and may interact with different proprietary components to perform the new standards-based business operations using distributed transactions.
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You can see that EJB can work well for massive and complex enterprise applications. In fact, we ve seen enterprise Java applications work in each of these situations. The people working on these types of problems can muster the considerable resources necessary to make an EJB application fly.
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