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Using the message-selector attribute with the @ejb.bean tag generates the following XML:

ically provides such services to the bean as automatic concurrency control, thread safety, pooling, and transaction management. In addition, you can add other services for which stateless beans are eligible, such as transparent security and interceptors.

@Local The @Local annotation on the PlaceBid interface tells the container that the PlaceBid EJB can be accessed locally through the interface. Since EJB and servlets are typically collocated in the same application, this

<message-driven> <ejb-name>MDB</ejb-name> <ejb-class>MessageBean</ejb-class> <transaction-type>Container</transaction-type> <message-selector> <![CDATA[ messageType = 'buyerRequest' ]]> </message-selector> </message-driven> </enterprise-beans> <ejb-jar>

Currently, a great deal of research is being carried out on the implementation of design patterns using AOP. This is because many design patterns crosscut, and therefore it is difficult to ensure sufficient modularity of these patterns within the object-oriented paradigm. In 2002, an OOPSLA conference article by Jan Hannemann and Gregor Kiczales1 discussed precursory research in this area. This work highlighted that implementing certain design patterns in AOP can lead to the following advantages: Locality: The code of the functionality is contained within the aspect rather than within the classes and, as a result, modularization is improved. Reusability: Refactoring code into aspects allows a greater degree of abstraction and better reusability. Composition transparency: An object can have several patterns applied to it without the global implementation becoming confusing. (Un)pluggability: The overall structure of the application depends less on the design patterns implemented. With AOP, a simple parameter change allows you to activate or deactivate a design pattern, for example, when making a class a singleton. However, these four advantages were not apparent for all design patterns. Some show all four benefits, others none. Of the 23 GoF design patterns, 17 show improvements with an implementation using AOP; 12 benefit in all four ways. The next sections apply AOP techniques to a sample of the GoF design patterns.

is probably perfect. Alternatively, we could have marked the interface with the @Remote annotation. Remote access through the @Remote annotation is provided under the hood by Java Remote Method Invocation (RMI), so this is the ideal means of remote access from Java clients. If the EJB needs to be accessed by non-Java clients like Microsoft .NET applications, web services based remote access can be enabled using the @WebService annotation applied either on the interface or the bean class. That s pretty much all we re going to say about stateless session beans for now. Let s now turn our attention to the client code for using the PlaceBid EJB.

Virtually any client can use the PlaceBid EJB in listing 2.1. However, the most likely scenario for EJB usage is from a Java-based web tier. In the ActionBazaar scenario, the PlaceBid EJB is probably called from a JavaServer Page (JSP) or servlet. For simplicity, let s assume that the PlaceBid EJB is used by a servlet named PlaceBidServlet. Listing 2.2 shows how the code might look. The servlet s service method is invoked when the user wants to place a bid. The bidder s ID, item ID, and the bid amount are passed in as HTTP request parameters. The servlet creates a new Bid object, sets it up, and passes it to the EJB addBid method.

package ejb3inaction.example.buslogic; import import import import import javax.ejb.EJB; javax.servlet.*; javax.servlet.http.*; java.io.*; ejb3inaction.example.persistence.Bid;

Notice the use of the CDATA brackets when specifying the message selector value. Because message selectors can use special characters like > and <, you must use the CDATA brackets so that the XML file can be correctly parsed.

public class PlaceBidServlet extends HttpServlet { @EJB Injects instance private PlaceBid placeBid; of PlaceBid EJB public void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { int bidderID = Integer.parseInt( request.getParameter("bidder_id"));

The first design pattern that we study with regards to aspect-oriented programming techniques is the Singleton. We begin by providing a quick description of this pattern, and proceed by giving two implementations of the pattern, one with JBoss AOP and one with AspectJ. We then conclude this section with an evaluation of the implementations.

int itemID = Integer.parseInt( request.getParameter("item_id")); double bidAmount = Double.parseDouble( request.getParameter("bid_amount")); Bid bid = new Bid(); bid.setBidderID(bidderID); bid.setItemID(itemID); bid.setBidAmount(bidAmount); placeBid.addBid(bid); ... } ... }