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As you already know, after throwing advice executes only when the matching method throws an exception. To create after throwing advice declaratively, we ll use the %(after-throwing%) element in the <aspect> element. We need to set at least the method, pointcut or pointcut-ref, and throwing attributes; in most cases, we will also set the arg-names attribute. Without any delay, let s take a look at the XML configuration in Listing 6-50. Listing 6-50. After Throwing Advice in XML < xml version="1.0" encoding="UTF-8" > <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd"> <bean id="userService" class="com.apress.prospring2.ch06.services.DefaultUserService"/> <bean id="stockService" class="com.apress.prospring2.ch06.services.DefaultStockService"/> <bean id="aspectBean" class="com.apress.prospring2.ch06.xml.AspectBean"/> <aop:config> <aop:aspect id="afterThrowingAspect" ref="aspectBean"> <aop:after-throwing method="healthMonitoring" pointcut="execution(* com.apress.prospring2. ch06.services.*.*(..)) && target(target)" arg-names="target,ex" throwing="ex"/> </aop:aspect> </aop:config> </beans> This after throwing advice binds the target of the invocation and the exception thrown to the arguments of method healthMonitoring. This means that the healthMonitoring method needs to have two arguments; to catch any exception on any target, the arguments types would have to be Object and Throwable. However, to show filtering based on argument types, we will take the code from Listing 6-51.

ChargeInfo: Contains additional information related to the individual Trx records that is specific to charges. Charges have an associated charge, unlike payments and adjustments, which are also stored in the Trx table. Diag: Stores the primary diagnoses of the patient being cared for and links to a record in the Trx table. Figure 2-1 shows a graphical layout of the eight tables and how they re joined.

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5. Enter a password for the account in the Password box, and enter it again in the Confirm Password box. Deselect the option User Must Change Password at Next Logon, and if your security policy allows it, select the Password Never Expires option. Figure 8-2 shows an example. Click Next. 6. Click Finish to complete the account creation process, as shown in Figure 8-3. 7. To verify that the account is created, select Users in the left pane of Active Directory Users and Computers. The account you just created will appear on the right side. 8. Repeat steps 3 7 to create a domain account for Analysis Services and SQL Server Agent depending on your implementation needs.

Unlike the constructor injection, we can create an instance of the DependentComponent without having the dependency. We are free to invoke the setter at any point in the application. We can also call the setter more than once, which allows us to swap the dependency at runtime.

One of the major components of your data center is the miles and miles of cabling that connect everything together. Properly cabling a data center to support your network and communications infrastructure can pose significant challenges since you will have power cables, network cables, fiber cables, and more. These tips will assist you in the process: Keep all cabling neat: There is nothing worse than trying to troubleshoot a hardware problem only to discover when looking at the back of a rack of servers a rat s nest of cables. You cannot trace a cable from its source and destination that way. Do due diligence and cable your systems, networks, and storage properly. You may be under the gun to get things done quickly, but that is no excuse for sloppy work. In the event of a failure due to a cable problem, it is much easier to pull and replace when it is not tangled up with 1,000 others. Time spent doing things right at this point pays huge dividends later. Properly label all cables: Along with neatly putting cables into components, buy a labeling machine and label both ends of the cable. If you are going to spend thousands, or even millions, on your data center, investing $50 on a labeler is one of the biggest bargains in your budget and can even be used for other purposes such as labeling your servers. You may also

Choosing which style of IoC to use injection or lookup is not usually a difficult decision. In many cases, the type of IoC you use is mandated by the container you are using. For instance, if you are using EJB 2.0, you must use lookup-style IoC to obtain the EJB from the Java EE container. EJB 3.0 introduces DI through its @Inject annotation. In Spring, aside from initial bean lookups, your components and their dependencies are always wired together using injection-style IoC.

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