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migrate your session bean methods to use the EntityManager API. We ll discuss migration of entity beans to the EJB 3 JPA in section 14.3. You can also opt to change the security and transactions settings to use metadata annotations. We ll cover those in a later section.

import javax.naming.NamingException; abstract public class EquityBean implements EntityBean { private EntityContext ctx; public void setEntityContext( EntityContext ctx ) { this.ctx = ctx; } public void unsetEntityContext() { this.ctx = null; } /* Data access methods below */ abstract public String getSymbol(); abstract public void setSymbol(String symbol); abstract public String getDescription(); abstract public void setDescription(String description); abstract public double getLastTrade(); abstract public void setLastTrade(double lastTrade); abstract public double getChange(); abstract public void setChange(double change); abstract public int getVolume(); abstract public void setVolume(int volume); abstract public double getMarketCap(); abstract public void setMarketCap(double marketCap); abstract public double getPe(); abstract public void setPe(double pe); abstract public int getAvgVolume(); abstract public void setAvgVolume(int avgVolume); /* bean methods below (NOT ALL SHOWN) */ public void ejbLoad() { System.out.println ( "EquityBean.ejbLoad (" + id() + }

14.2.2 Resource usage Your EJB applications may be using JNDI lookup to find resources such as DataSources or JMS objects, and services such as EJBs or web services. Now that dependency injection is so readily available, you can use it instead of JNDI to find these resources. However, you have to remember the limitations of EJB 3 dependency injection. If you re using a DataSource, the differences between EJB 2 and EJB 3 are shown in table 14.3.

In another context, we could use the singleton aspect with a class that contains several constructors. Although multiconstructor classes are not as adaptable to the singleton design pattern since it is designed to work with only one constructor, multiconstructor classes are frequently used in real applications, and therefore we can extend the pattern to deal with this case. With different constructors, we can expect the creation of different instances (which is not the case with our current implementation). This difficulty is, however, by no means insurmountable. It is possible to store one instance for each constructor. Besides, we can store an instance not only depending on the header, but also on the values of the parameters. With AspectJ, we obtain the result shown in Listing 8-8 for the abstract aspect. Listing 8-8. Second Implementation of the Singleton Design Pattern Using AspectJ package aop.patterns.singleton; import java.util.Hashtable; public abstract aspect AbstractMultipleSingletonAspect { private Hashtable singletons = new Hashtable(); abstract pointcut singletonPointcut(); private String getValue(Object o) { if (!o.getClass().isArray()) { return Integer.toString(o.hashCode()); } else { StringBuffer value = new StringBuffer(); Object[] temp = (Object[]) o; for (int i=0;i<temp.length;i++) { value.append(getValue(temp[i])); value.append('|'); } return value.toString(); } } Object around(): singletonPointcut() { String arguments; String signature = thisJoinPoint.getSignature().toString(); if(thisJoinPoint.getArgs().length>0) { arguments = getValue(thisJoinPoint.getArgs()); } else { arguments = ""; }

Table 14.3 The use of DataSource in EJB 2 was very complex and has been simplified in EJB 3 by using dependency injection. EJB 2 Define resource-ref in ejb-jar.xml Lookup resource Context ctx = new InitialContext(); DataSource ds = (DataSource) ctx.lookup("java:comp/env/ ActionBazaarDS"); Connection conn = ds.getConnection(); EJB 3 Can use dependency injection @Resource(name = "ActionBazaarDS") private DataSource ds; Connection conn = ds.getConnection();

Table 14.4 The use of JMS objects in EJB 2 was also very complex and has been simplified in EJB 3 by using dependency injection. EJB 2.x Define resource-ref in ejb-jar.xml Lookup resource Context ctx = new InitialContext(); QueueConnectionFactory qcf = (QueueConnectionFactory) ctx.lookup("java:comp/env/jms/Queue ConnectionFactory"); QueueConnection conn = qcf.createQueueConnection(); EJB3 @Resource(name = "jms/QueueConnectionFactory") private QueueConnectionFactory qcf;

")" );

QueueConnection conn = qcf. createQueueConnection();

Object singleton = singletons.get(signature+arguments); if (singleton == null) { singleton = proceed(); singletons.put(signature+arguments,singleton); } return singleton; } } This new implementation of the abstract aspect is more complex than the previous example because we have used a hash table to store the singleton instances. The key used in the hash table is determined according to the signature of the constructor and the value of the arguments. The value is obtained using the method getValue (this method is explained in 9 in the section Nonregression Tests. ) Now, to support multiple constructors, we have to create the aspect SingletonAspect by subclassing the abstract aspect AbstractMultipleSingletonAspect. Using a hash table could also solve the problem stated previously, whereas a concrete aspect cannot be shared by several aspectized classes.