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Figure 4-1. The org.aopalliance.intercept interface hierarchy The JoinPoint interface is the root type for all interceptions. For each joinpoint, three methods are defined: proceed, which executes the joinpoint; getThis, which returns the object where the joinpoint occurred; and getStaticPart, which returns the code element defining the joinpoint. This code element can be either a method or a constructor. It is represented by the java.lang.reflect.AccessibleObject class which, in the J2SE reflection API, is the superclass of all the code elements where reflection applies. The Invocation interface extends JoinPoint with the getArguments method to manipulate the arguments of the intercepted execution. These arguments are returned as an array of objects that can be read or written. The last two interfaces, ConstructorInvocation and MethodInvocation, correspond to constructor executions and method executions. Each provides a method that returns the intercepted constructor (as a parameter of type java.lang.reflect.Constructor) or the intercepted method (as a parameter of type java.lang.reflect.Method).

We implement business logic with session beans and then we add the power of asynchronous messaging by adding a messagedriven bean (MDB) Finally you ll discover the most powerful innovation of EJB 3 by looking at a simple example of a Java Persistence API (JPA) entity If you aren t a big fan of views from heights, don t worry too much Think of this chapter as that first day at a new workplace, shaking hands with the stranger in the next cubicle In the chapters that follow, you ll get to know more about your new coworkers likes, dislikes, and eccentricities; and you ll learn how to work around these foibles All you are expected to do right now is put names to faces..

Table 8.3 Conversion characters that degrade overall application performance. The process that creates the data produced by these characters is time-consuming. Repeatedly using these characters will eventually degrade the performance of your application to a noticeable degree. Character C d Data acquired Fully qualified classname Date of the logging event Performance problem The logging framework must walk the stack trace in order to build the classname of the object sending the message. If you use this character, use one of the log4j date formatters. For example, use ABSOLUTE, DATE or IISO8601 with a character like %d{ABSOLUTE}. The SimpleDateFormat from the JDK is much slower than the log4j formatters. See recipe 8.1 and log4j docs for more information. Same problems as using C . Suffers from having to walk the stack trace in order to gather information about class, file, and line number. Same problems as l . Same problems as l .

For a complex application, you ll probably have multiple named queries. In that case, you can use the @javax.persistence.NamedQueries annotation to specify multiple named queries like this:

@Entity @NamedQueries({ @NamedQuery( name = "findCategoryByName", query = "SELECT c FROM Category c WHERE c.categoryName LIKE :categoryName order by c.categoryId" ), @NamedQuery( name = "findCategoryByUser", query = "SELECT c FROM Category c JOIN c.user u WHERE u.userId = 1" )}) @Table(name = "CATEGORIES") public class Category implements Serializable { }

Regardless of the inherent speed of the log4j system, improving performance of your logging system relies on good programming practices and thoughtful message construction. For instance, the recipe shows a simple example of how reusing already acquired object values can decrease the time it takes to build a message. In addition, concatenating strings, converting primitive types to strings, and similar steps should be used only when necessary. If you must construct a message from various parts (which is common), you should at least test for the logger level to avoid unnecessary construction of the message. When using the PatternLayout class to format your messages, always be concerned with the performance degradation of certain conversion characters. Refer to table 8.3 for these characters, but keep in mind that although they can provide useful data, they do so at a high cost of time. Finally, if performance is your utmost objective, switch to the SimpleLayout class for formatting messages. It provides only a simple message structure, but it performs the fastest of the layout classes.