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public static void main(String[] args) { MessageWriter target = new MessageWriter(); // create the proxy ProxyFactory pf = new ProxyFactory(); pf.addAdvice(new SimpleBeforeAdvice()); pf.setTarget(target); MessageWriter proxy = (MessageWriter) pf.getProxy(); // write the messages proxy.writeMessage(); } public void before(Method method, Object[] args, Object target) throws Throwable { System.out.println("Before method: " + method.getName()); } } In this code, you can see that we have advised an instance of the MessageWriter class that we created earlier with an instance of the SimpleBeforeAdvice class. The MethodBeforeAdvice interface, which is implemented by SimpleBeforeAdvice, defines a single method, before(), which the AOP framework calls before the method at the joinpoint is invoked. Remember that, for now, we are using the default pointcut provided by the addAdvice() method, which matches all methods in a class. The before() method is passed three arguments: the method that is to be invoked, the arguments that will be passed to that method, and the Object that is the target of the invocation. The SimpleBeforeAdvice class uses the Method argument of the before() method to write a message to stdout containing the name of the method to be invoked. Running this example gives us the following output: Before method: writeMessage World As you can see, the output from the call to writeMessage() is shown, but just before it, you can see the output generated by the SimpleBeforeAdvice.

Right-click the Policies folder in SQL Server Management Studio and select New Policy from the context menu Give the policy a descriptive name, such as Check Number of Databases Click the Conditions drop-down list and select New Condition to display the Create New Condition dialog box Give the condition a descriptive name, such as Check Number of Databases Click the Facet drop-down list and select the Server facet, since we will be checking this policy at the server level Click the ellipsis button next to the Field column in the Expression grid to display the Advanced Edit dialog box When you highlight a function in the Advanced Dialog box, you get a lot of useful information in the Details section on the right side of the dialog box, including an example of how to execute each function We want to get a count of all the databases on the server.

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The previous example was fairly trivial and didn t really show the power of AOP. In this section, we are going to build before advice that checks user credentials before allowing the method invocation to proceed. If the user credentials are invalid, an exception is thrown by the advice, thus preventing the method from executing. The example in this section is simplistic. It allows users to authenticate with any password, and it also allows only a single, hard-coded user access to the secured methods. However, it does illustrate how easy it is to use AOP to implement a crosscutting concern such as security. Listing 5-5 shows the SecureBean class. This is the class that we will be securing using AOP. Listing 5-5. The SecureBean Class package com.apress.prospring2.ch05.security; public class SecureBean {

Proven practices, or best practices, is the next key element. Some of the proven practices in MSF are as follows: Use small, multidisciplinary teams: Small teams are more agile than larger. When the project is large, try breaking the whole into several smaller teams. Enable teams to work together at a single site: If we work closely together, we can be more effective. Motivate: Motivated teams are more effective. Get specific early: Move from the abstract to the specific early. This helps the team align its thinking and reach consensus on how to implement a shared vision.

public void writeSecureMessage() { System.out.println("Every time I learn something new, " + "it pushes some old stuff out of my brain"); } } The SecureBean class imparts a small pearl of wisdom from Homer Simpson, wisdom that we don t want everyone to see. Because this example requires users to authenticate, we are somehow going to need to store their details. Listing 5-6 shows the UserInfo class we use to store a user s credentials. Listing 5-6. The UserInfo Class package com.apress.prospring2.ch05.security; public class UserInfo { private String username; private String password; public UserInfo(String username, String password) { this.username = username; this.password = password; } public String getPassword() { return password; } public String getUsername() { return username; } } There is nothing of particular interest in this class; it simply holds data about the user so that we can do something useful with it. Listing 5-7 shows the SecurityManager class, which is responsible for authenticating users and storing their credentials for later retrieval. Listing 5-7. The SecurityManager Class package com.apress.prospring2.ch05.security; public class SecurityManager { private static ThreadLocal<UserInfo> threadLocal = new ThreadLocal<UserInfo>(); public void login(String username, String password) { // assumes that all credentials // are valid for a login threadLocal.set(new UserInfo(username, password)); } public void logout() { threadLocal.set(null); }

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