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create a new instance of the class. When the constructor is invoked, the aspect intercepts and substitutes the new method with the code needed to manage the singleton. With JBoss AOP, we can define the interceptor presented in Listing 8-2. Listing 8-2. Implementation of the Singleton Design Pattern Using JBoss AOP package aop.patterns.singleton; import org.jboss.aop.advice.Interceptor; import org.jboss.aop.joinpoint.Invocation; public class SingletonInterceptor implements Interceptor { private Object singleton; public String getName() { return "SingletonInterceptor"; } public Object invoke(Invocation invocation) throws Throwable { if (singleton==null) { singleton = invocation.invokeNext(); } return singleton; } } The code of this interceptor is similar to the object-oriented implementation of the singleton: it includes an attribute, which is used to store the unique instance of the singleton, and the method invoke, which uses the same kind of test to check the existence of the instance when a constructor is called. If the instance does not exist, invoke calls the constructor and stores the instance generated in the singleton attribute. Note that the interceptor contains the code to handle the singleton and that it can be applied to a class in a way that is completely transparent for the rest of the application. For the purpose of our example, we use a class called Stats, which contains various statistics for an e-commerce site (see Listing 8-3). Listing 8-3. Sample Class to Test theSingleton Design Pattern package aop.patterns.singleton; public class Stats { private int orders = 0; private float totalAmount = 0; private String status = "OK"; public int getOrders() { return orders; }

Formats a number by the invariant culture Formats a number by the current culture Parses a number value from a string Parses a number from a locale-specific string

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The previous example didn t do anything useful with the XML response sent by the server Displaying the values of the XML document in an alert box doesn t provide much real-world value What you really want to do is bring a rich client feel to the user by avoiding the constant page refreshing found in typical Web applications Not only is the constant page refreshing annoying to the user, but also it wastes precious processor cycles on the server by rebuilding the entire page s content and needlessly using network bandwidth to carry the refreshed page The best solution, of course, is to change the existing content on the page on an as-needed basis Instead of refreshing the entire page when most of the data on the page probably hasn t changed, we prefer to simply change the parts of the page where information has changed.

public void incOrders() { orders++; } public float getTotalAmount() { return totalAmount; } public void addAmount(float p) { totalAmount+=p; } public String getStatus() { return status; } public void setStatus(String p) { status = p; } public void reset() { orders = 0; totalAmount = 0; status = "OK"; } } We will apply the Singleton design pattern to this class by parameterizing the file jboss-aop. xml in the way shown in Listing 8-4. Listing 8-4. Binding the Singleton Design Pattern to the Stats Class <bind pointcut="execution(aop.patterns.singleton.Stats->new())"> <interceptor class="aop.patterns.singleton.SingletonInterceptor"> </bind> It is easy to check if the design pattern has been applied correctly by using the class in Listing 8-5. Listing 8-5. Main Class for Testing the Singleton Design Pattern with JBoss AOP package aop.patterns.singleton; public class SingletonExample { public static void main(String[] args) { Stats stats1 = new Stats(); Stats stats2 = new Stats(); if (stats1==stats2) {

The two formatting methods of the Number extension support four format providers that can be used depending on a type of number (e.g., percentage, currency, etc.). These format providers are listed in Table 4-6.

Traditionally this has been difficult to do within the confines of the Web browser The browser is really just a tool that interprets special markup tags (HTML) and displays them according to a set of predefined rules The Web, and thus Web browsers, was originally intended to display static information information that didn t change without requesting new data from the server in the form of a new page With some exceptions, modern browsers represent the contents of a Web page using the W3C DOM Doing so ensures that Web pages will be rendered identically among different browsers and that scripts intended for modifying the contents of the page will behave identically across browsers The continuing maturity of the W3C DOM and JavaScript implementations by Web browsers has greatly simplified the task of creating content dynamically on the browser.

System.out.println("These instances are the same!"); } else { System.out.println("These instances are not the same!"); } } } We no longer need the method getInstance since the Singleton is accessed through a standard call to the constructor. The Singleton design pattern is now entirely transparent with respect to the application. The result obtained by running this program is the following:

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