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Declaring Pointcut Parameters One way to access join point information is by reflection (i.e., via an argument of type org.aspectj.lang.JoinPoint in the advice method). Besides, you can access join point information in a declarative way by using some kinds of special pointcut expressions. For example, the expressions target() and args() capture the target object and argument values of the current join point and expose them as pointcut parameters. These parameters will be passed to your advice method via arguments of the same name. package com.apress.springrecipes.calculator; ... import org.aspectj.lang.annotation.Aspect; import org.aspectj.lang.annotation.Before; @Aspect public class CalculatorLoggingAspect { ... @Before("execution(* *.*(..)) && target(target) && args(a,b)") public void logParameter(Object target, double a, double b) { log.info("Target class : " + target.getClass().getName()); log.info("Arguments : " + a + ", " + b); } } When declaring an independent pointcut that exposes parameters, you have to include them in the argument list of the pointcut method as well. package com.apress.springrecipes.calculator; import org.aspectj.lang.annotation.Aspect; import org.aspectj.lang.annotation.Pointcut; @Aspect public class CalculatorPointcuts { ... @Pointcut("execution(* *.*(..)) && target(target) && args(a,b)") public void parameterPointcut(Object target, double a, double b) {} } Any advice that refers to this parameterized pointcut can access the pointcut parameters via method arguments of the same name.

With a router you can specify a known list of channels on which the incoming Message should be passed. This has some powerful implications. It means you can change the flow of a process conditionally, and it also means that you can forward a Message to as many (or as few) channels as you want. There are some convenient default routers available to fill common needs, such as payload type based routing (PayloadTypeRouter) and routing to a group or list of channels (RecipientListRouter). Imagine for example a processing pipeline that routes customers with high credit scores to one service and customers with lower credit scores to another process in which the information is queued up for a human audit and verification cycle. The configuration is, as usual, very straightforward. In the following example, you show the configuration. One router element, which in turn delegates the routing logic to a class, is CustomerCreditScoreRouter. <beans:bean id="customerCreditScoreRouter". class="com.apress.springenterpriserecipesspringintegration. CustomerCreditScoreRouter"/> <channel id="safeCustomerChannel"/> <channel id="riskyCustomerChannel"/> <router input-channel="customerIdChannel" ref="customerCreditScoreRouter"/> The Java code is similarly approachable. It feels a lot like a workflow engine s conditional element, or even a JSF backing-bean method, in that it extricates the routing logic into the XML configuration, away from code, delaying the decision until runtime. In the example, the Strings returned are the names of the channels on which the Message should pass. import org.springframework.integration.annotation.Router; public class CustomerCreditScoreRouter { @Router public String routeByCustomerCreditScore(Customer customer) { if (customer.getCreditScore() > 770) { return "safeCustomerChannel"; } else { return "riskyCustomerChannel"; } } }

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package com.apress.springrecipes.calculator; ... import org.aspectj.lang.annotation.Aspect; import org.aspectj.lang.annotation.Before; @Aspect public class CalculatorLoggingAspect { ... @Before("CalculatorPointcuts.parameterPointcut(target, a, b)") public void logParameter(Object target, double a, double b) { log.info("Target class : " + target.getClass().getName()); log.info("Arguments : " + a + ", " + b); } }

Recall that by default, the Spring MBeanExporter exports all public properties of a bean as MBean attributes and all public methods as MBean operations. In fact, you can assemble the management interface of your MBeans using an MBean assembler. The simplest MBean assembler in Spring is MethodNameBasedMBeanInfoAssembler, which allows you to specify the names of the methods to export. <beans ...> ... <bean id="mbeanExporter" class="org.springframework.jmx.export.MBeanExporter"> ... <property name="assembler" ref="assembler" /> </bean> <bean id="assembler" class="org.springframework.jmx.export.assembler. MethodNameBasedMBeanInfoAssembler"> <property name="managedMethods"> <list> <value>getSrcDir</value> <value>setSrcDir</value> <value>getDestDir</value> <value>setDestDir</value>

Sometimes you may have a group of classes that share a common behavior. In OOP they must , extend the same base class or implement the same interface. This issue is actually a crosscutting concern that can be modularized with AOP. In addition, the single inheritance mechanism of Java only allows a class to extend one base class at most. So, you cannot inherit behaviors from multiple implementation classes at the same time.

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