T HE SERV IC E LAYE R, T RANS AC TION MA NA GEMEN T, A ND A OP in Java

Generation DataMatrix in Java T HE SERV IC E LAYE R, T RANS AC TION MA NA GEMEN T, A ND A OP

CHAPTER 5 T HE SERV IC E LAYE R, T RANS AC TION MA NA GEMEN T, A ND A OP
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if(!Timesheet.class.isAssignableFrom(method.getReturnType())) { return false; } return true; }
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public boolean matches(final Method method, final Class type, final Object[] args) { for( final UserRole role : PrincipalHelper.getUser().getRoles() ) { if("ROLE_ADMINISTRATOR".equals(role.getRoleName())) { return false; } } return true; } } Listing 5-38 shows that the dynamic pointcut can be applied to exactly the same advice logic shown in Listing 5-32 that was configured with a static pointcut in Listing 5-36.
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Listing 5-38. Configuring the After Returning Advice with a Dynamic Pointcut
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<bean id="timesheetAfterReturningAdvice" class="org.springframework.aop.support.DefaultPointcutAdvisor"> <property name="advice"> <bean class="com.apress.timesheets.customaop.TimesheetAfterReturningAdvice"/> </property> <property name="pointcut" ref="dynamicPointcut"/> </bean> <bean id="dynamicPointcut" class="com.apress.timesheets.customaop.TimesheetDynamicPointcutImpl"/> The example implementation source code provided at the Source Code/Download area of the Apress website (www.apress.com) includes copious output-logging logic that I have omitted for the sake of brevity. If you configure the use of the dynamic pointcut, you will see that the TimesheetAfterReturningAdvice logic is invoked only when a nonadministrative user carries out operations that cause the findTimesheet method to be invoked.
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C H AP TE R 5 TH E S ERVI CE LA YER, TRA NS ACT I ON MAN AGEM ENT , A ND AO P
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In this chapter, you have looked at the development of the service layer containing business logic. You have seen how the methods of the service layer can be made transactional by using AOP. You also have also seen how AOP classes can be created to enforce security guarantees upon the service layer without influencing its design. In the next chapter, we will finally build our presentation layer the web application upon the foundation provided by the service layer created in this chapter.
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n the preceding chapter, you looked at the issues around building the service layer for our application. In this chapter, we start to build the presentation layer of our application as a web application.
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The Model View Controller Pattern
The standard architectural model for building a web application now is the Model View Controller (MVC) pattern, shown in Figure 6-1. I will present this briefly before embarking on a discussion of the specific implementations that are available to you when building a Spring application.
Figure 6-1. The Model View Controller pattern
The model is the domain-specific representation of the data that is involved in your application. Our entity beans and the service layer form the model in a Spring application; your presentation layer is merely used to manipulate the data in the model. The view is a representation of the data in the model. This is not to say that there is no other data in the view it may well contain transitory data and implementation data but that
CH APT ER 6 WEB A PPLI CA TI O NS
the main purpose of the view is to accurately represent the data in the model and reflect changes to that data. The controller updates the model in reaction to events received from the user, and causes the appropriate view for the model to be displayed or updated. It is entirely possible to build an MVC application by using ordinary Java EE components. For example, you could build the model by using JDBC and beans (or even use ResultSet objects directly). You can build the views from JSPs and servlets, and the controllers from servlets. Although it is possible to build an MVC application by using traditional Java EE technologies, it is not an edifying experience. None of these components establishes a clean boundary of responsibility, so the distinction between controller and view, for example, is often lost in large applications with the corresponding increase in code complexity and loss of clarity. Instead, Spring provides its own MVC frameworks: Spring MVC and Spring Web Flow (the two are closely related).
Managing Contexts
The web application will need to draw Spring beans from a context. This means that the context must be available to filters, servlets, JSPs, and any other objects that will be encountered during the processing of a request.
Context Loader Listener
The context loader listener is a standard Java listener implementation, and as such it is ideally situated to maintain state information during the life cycle of the web application that it is attached to. The context loader listener must be declared in your web application s deployment descriptor file (web.xml), as shown in Listing 6-1.
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