Java/Spring/Log
Spring Aspect Logging
<source lang="java">
File: IBusinessLogic.java
public interface IBusinessLogic {
public void foo(); public void bar() throws BusinessLogicException;
}
File: LoggingThrowsAdvice.java import org.springframework.aop.ThrowsAdvice; import java.lang.reflect.Method; public class LoggingThrowsAdvice implements ThrowsAdvice {
public void afterThrowing(Method method, Object[] args, Object target, Throwable subclass) { System.out.println("Logging that a " + subclass + "Exception was thrown."); }
}
File: MainApplication.java
import org.springframework.context.ApplicationContext; import org.springframework.context.support.FileSystemXmlApplicationContext; public class MainApplication {
public static void main(String [] args) { // Read the configuration file ApplicationContext ctx = new FileSystemXmlApplicationContext("build/springconfig.xml"); //Instantiate an object IBusinessLogic testObject = (IBusinessLogic) ctx.getBean("businesslogicbean"); //Execute the public methods of the bean testObject.foo(); try { testObject.bar(); } catch(BusinessLogicException ble) { System.out.println("Caught BusinessLogicException"); } }
}
File: springconfig.xml <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd"> <beans>
<bean id="businesslogicbean" class="org.springframework.aop.framework.ProxyFactoryBean"> <property name="proxyInterfaces"> <value>IBusinessLogic</value> </property> <property name="target"> <ref local="beanTarget"/> </property> <property name="interceptorNames"> <list> <value>tracingBeforeAdvisor</value> <value>tracingAfterAdvisor</value> <value>loggingThrowsAdvisor</value> </list> </property> </bean> <bean id="beanTarget" class="BusinessLogic"/> <bean id="tracingBeforeAdvisor" class="org.springframework.aop.support.RegexpMethodPointcutAdvisor"> <property name="advice"> <ref local="theTracingBeforeAdvice"/> </property> <property name="pattern"> <value>.*</value> </property> </bean> <bean id="tracingAfterAdvisor" class="org.springframework.aop.support.RegexpMethodPointcutAdvisor"> <property name="advice"> <ref local="theTracingAfterAdvice"/> </property> <property name="pattern"> <value>.*</value> </property> </bean> <bean id="loggingThrowsAdvisor" class="org.springframework.aop.support.RegexpMethodPointcutAdvisor"> <property name="advice"> <ref local="theLoggingThrowsAdvice"/> </property> <property name="pattern"> <value>.*</value> </property> </bean> <bean id="theTracingBeforeAdvice" class="TracingBeforeAdvice"/> <bean id="theTracingAfterAdvice" class="TracingAfterAdvice"/> <bean id="theLoggingThrowsAdvice" class="LoggingThrowsAdvice"/>
</beans>
File: TracingAfterAdvice.java import java.lang.reflect.Method; import org.springframework.aop.AfterReturningAdvice; public class TracingAfterAdvice implements AfterReturningAdvice {
public void afterReturning(Object object, Method m, Object[] args, Object target) throws Throwable { System.out.println("Hello world! (by " + this.getClass().getName() + ")"); }
}
File: TracingBeforeAdvice.java import java.lang.reflect.Method; import org.springframework.aop.MethodBeforeAdvice; public class TracingBeforeAdvice implements MethodBeforeAdvice {
public void before(Method m, Object[] args, Object target) throws Throwable { System.out.println("Hello world! (by " + this.getClass().getName() + ")"); }
}
File: BusinessLogic.java
public class BusinessLogic implements IBusinessLogic {
public void foo() { System.out.println("Inside BusinessLogic.foo()"); } public void bar() throws BusinessLogicException { System.out.println("Inside BusinessLogic.bar()"); throw new BusinessLogicException(); }
}
File: BusinessLogicException.java
public class BusinessLogicException extends Exception { }
</source>