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CHAPTER 11 USING AOP WITHIN THE SAMPLE APPLICATION S BUSINESS TIER
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Figure 11-3. Business tier components and their aspects We can note that the sizes of the business components implementations are clearly smaller for the POJO versions. This comes from the persistence externalization. Advice codes are used more in facade components (like the last two) than in the business components. This comes from an implementation choice, which makes a great use of intertype declarations on business components.
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Using AOP in the Sample Application s Presentation and Client Tiers
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n 11, we used AOP to improve the business tier design of the Duke s Bank case study application presented in 10. In this chapter, we ll investigate the use of AOP in other tiers in particular, the Java (Swing) client tier and the presentation tier. We will not use the data tier since it cannot benefit from Java-based AOP techniques (as we explained previously in 11). The original design of the case study does not adapt completely to AOP because it uses ad hoc design solutions. The web presentation tier, for example, uses the Struts framework, which encapsulates some difficult design issues. This does not mean that AOP cannot be useful, especially for improving Struts implementation or integration. However, because of the inherent complexity, in this chapter we introduce simplified pieces of design to more clearly illustrate the advantages of AOP. We first show the use of AOP in the Java Swing client, and then we elaborate on its impacts for the web (Servlets/JSP) presentation tier.
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Using AOP for Distributed Communications
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Communication issues can arise when clients access the business servers in a three-tier J2EE environment. The client tier contains several design patterns that are designed to deal with the concerns that come with distributed communications. The J2EE design patterns for communication and data transfer most often impact the client side and occasionally impact the server side. Thus, these patterns represent an important source of crosscutting, especially when building multiclient applications. As previously explained, the use of J2EE design patterns is not mandatory. However, by using them, we can contrast aspect-oriented implementations with well-documented, wellknown, and proven reference designs.
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CHAPTER 12 USING AOP IN THE SAMPLE APPLICATION S PRESENTATION AND CLIENT TIERS
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Design Patterns for Business Layer Access
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The three main J2EE design patterns for client/server communication are the business delegate, the service locator, and the data transfer object. In this chapter, we illustrate these patterns used with and without the help of AOP. For simplicity, we use a basic Java client that accesses the sample application presented in 11 as well as this one. We discuss its limitations and show how aspects improve the client implementation independence with regard to the technology and the design choices.
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Business Delegate
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The goal of the business delegate is to hide the implementation details of the server remote access protocol, such as the lookup of the EJB container, through a JNDI repository or the processing of remote invocations. As a consequence, this design pattern reduces the coupling between the presentation tier clients and the business tier. However, this design pattern does not completely eliminate the dependence, because its interface is subject to change if the business services are modified. Moreover, the systematic reference to the business delegate layer within each client implementation constitutes by itself a crosscutting concern. Even though the location and the transparency of the distribution layers are benefits of this pattern, the business delegate can induce some subtle utilization problems. Indeed, the client cannot use a business delegate as if it was a local object, since doing so may generate serious performance issues, such as network overloads. Therefore, client-side programmers must be aware that the manipulated objects are proxies for remote objects. Listing 12-1 defines a simple Java client, which we have developed to illustrate the issues discussed in this section. These issues can be transposed into real bank clients: the Java Swing administration client and the servlet-based presentation layer. Listing 12-1. A Simple Client for the Bank Application 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 package aop.j2ee.client.java.regular; import import import import java.math.BigDecimal; java.util.Date; aop.j2ee.client.delegate.BankDelegate; aop.j2ee.commons.to.AccountDetails;
public class Simple { public static void main(String[] args) { try { BankDelegate deleguate = new BankDelegate(); String customerId = deleguate.createCustomer("Pawlak","Renaud","P", "Frederick St","Hartford","CT","06105","NA", "renaud@aopsys.com"); System.out.println("Created new customer " + customerId); String accountId = deleguate.createAccount(customerId,"Debit", "This is a test.",new BigDecimal(100),new BigDecimal(0), new BigDecimal(100),new Date());
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