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Exception handlers enable you to modularize the treatments that are attached to exceptions. Rather than scattering several versions of a try/catch block in the application code, you can usually write the code that is defined in the catch block in a unique and well-defined entity: the exception handler. The exception handler is defined in a wrapper and catches exceptions that are generated by joinpoints or wrappers. The handler is declared when you call the pointcut method to define a pointcut. The signature of the pointcut method is imposed, a unique parameter of type Exception must be defined, and the return type must be Object. The name of the exception handler can be freely chosen. Each defined exception handler can be dedicated to handling a particular type of exception. For example, one handler can treat the IOException, whereas another handles network exceptions. The TraceAspect5 aspect, which is shown in Listing 4-10, illustrates the definition of an exception handler. Listing 4-10. An Example of a Role Method and an Exception Handler package aop.jac; import import import import org.aopalliance.intercept.ConstructorInvocation; org.aopalliance.intercept.MethodInvocation; org.objectweb.jac.core.AspectComponent; org.objectweb.jac.core.Wrapper;

UPDATE entityName indentifierVariable SET single_value_path_expression1 = value1, ... single_value_path_expressionN = valueN WHERE where_clause

When deploying this bean, you must also provide a log4j configuration file with all the logger names that are found in the other cluster members. Provide a single appender across all the named loggers in order to achieve a single, consolidated log repository.

You can use any persistence field and single value association field in the SET clause of the UPDATE statement. Assume that we want to provide Gold status and a commissionRate of 10 percent to all Sellers whose lastName starts with Packrat. Start with the following JPQL statement:

UPDATE Seller s SET s.status = 'G', s.commissionRate = 10 WHERE s.lastName like 'PackRat%'

public class TraceAspect5 extends AspectComponent { public TraceAspect5() { pointcut( "ALL","ALL","ALL", "aop.jac.TraceWrapper4", "myIOExceptionHandler", false ); } } public class TraceWrapper5 extends Wrapper { public TraceWrapper5(AspectComponent ac) { super(ac); } public Object myIOExceptionHandler(Exception e) throws Exception { System.out.println( "Exception "+e.getMessage()+"raised" ); if ( ! (e instanceof java.io.IOException) ) throw e; return null; }

The important parts of this recipe are the onMessage() method of the messagedriven bean LogConsolidatorBean and its log4j configuration file. Examining the onMessage() call, you might be asking yourself why we did not simply call the event.getMessage() method and send it to a new logger for formatting. Well, we could have done that, but the log message would have lost all of its format and context information. For instance, all the messages sent to a new logger would have a new thread, timestamp, classname, and so forth. Instead, we preserve logging event context information by sending the event itself to a logger. To actually persist the log message (to a file, for example), we need to invoke the appenders associated with the retrieved logger. The key to this recipe is duplicating all the logger names specified in the cluster into the log4j configuration file used by the message-driven bean JVM. It is not necessary to duplicate all of the appender setup just the loggers. In the new

It is clear from this statement that the WHERE clause of an UPDATE behaves exactly the same as the one we used in the SELECT statement. We will return to a detailed discussion on the WHERE clause later in this chapter. Using DELETE Like UPDATE, DELETE in JPQL resembles its SQL cousin. You can specify only one entity type with a DELETE statement, and again you should specify a WHERE clause to limit the number of entities affected by the statement. Here is the syntax for the DELETE statement:

For example, if we want to remove all instances of Seller with Silver status we d use this:

log4j configuration file, you need just one appender for all the loggers, which ensures that all the messages are routed to a single location. For information about sending log messages to a JMS queue (from each of the cluster members), see recipe 8.4.

DELETE Seller s WHERE s.status = 'Silver'