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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; } rdlc upc-a UPC-A Generator DLL for VB.NET Class - Generate Barcode in VB ...
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In the following guide we'll create a local report ( RDLC file) which features barcoding capabilities by using Bytescout Barcode SDK. Follow these steps:. 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) { Next, you would look up an instance of a container-managed EntityManager via JNDI as follows: javax.ejb.SessionBean; javax.naming.InitialContext; javax.sql.DataSource; java.sql.*; Context context = new InitialContext(); EntityManager entityManager = (EntityManager) context.lookup("java:comp/env/ActionBazaarEntityManager"); ... entityManager.persist(bid); Notice that this JNDI lookup appears to be like all the others in the book. The only special thing you would have to do is to package a persistence.xml that describes the persistence unit and set version="3.0" in the ejb-jar.xml. It s starting to look familiar, isn t it Using EJB 3 from EJB 2 boils down to 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: public class SampleDataSourceBean implements SessionBean { // Other bean methods left out intentionally Making some modifications to your deployment descriptors Working a little JNDI magic to get object references (if your server doesn t support dependency injection for EJB 2) That s all there is to it! It s so simple that this concludes our discussion on backward compatibility and interoperability of EJB applications.
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